Transaxle

Patent metadata

Field	Value
Publication number	US-9759310-B2
Application number	US-201514683864-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	Apr 10, 2015
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A transaxle comprises a hydrostatic transmission (HST), an axle, a gear train interposed between the HST and the axle, a casing and a partition. The casing defines an HST chamber and a gear chamber. The HST is disposed in the HST chamber. The gear train and the axle are disposed in the gear chamber. The partition is disposed in the casing so as to separate the HST chamber and the gear chamber from each other. The partition has an opening through which a hydraulic motor of the HST passes to extend from the HST chamber into the gear chamber so as to be drivingly connected to the gear train. The partition obstructs a flow of fluid between a fluid sump in the HST chamber from a fluid sump in the gear chamber.

First claim

What is claimed is:

1. A transaxle comprising:
a hydrostatic transmission (hereinafter, “HST”) including a hydraulic pump, a hydraulic motor, and a center section, wherein the hydraulic pump and the hydraulic motor are mounted on the center section so as to be fluidly connected to each other via a closed fluid circuit formed in the center section;
an axle;
a gear train interposed between the HST and the axle so as to transmit power from the HST to the axle;
a casing defining an HST chamber and a gear chamber, wherein the HST is disposed in the HST chamber, wherein the gear train and the axle are disposed in the gear chamber;
a partition disposed in the casing so as to separate the HST chamber and the gear chamber from each other, wherein the partition has an opening through which a power transmission means for transmitting power from the HST to the gear train passes to extend from the HST chamber into the gear chamber so as to be drivingly connected to the gear train;
a fluid sump provided in the HST chamber so that the HST is submerged in the fluid sump in the HST chamber; and
another fluid sump provided in the gear chamber so that the gear train is submerged in the fluid sump in the gear chamber,
wherein the partition is configured to obstruct a flow of fluid between the fluid sumps in the HST chamber and the gear chamber.

2. The transaxle according to claim 1 , wherein the hydraulic motor is extended from the HST chamber into the gear chamber via the opening of the partition so as to serve as the power transmission means.

3. The transaxle according to claim 2 , wherein the hydraulic motor is extended vertically slantwise in side view from the HST chamber to the gear chamber, and wherein the partition is extended vertically.

4. The transaxle according to claim 1 , wherein the casing includes divisional housings formed on the insides thereof with respective ribs serving as the partition, wherein edges of the respective ribs of the divisional housings facing each other are formed with respective recesses, and wherein the divisional housings are joined to each other to constitute the casing so that the ribs of the respective divisional housings abut at the edges thereof against each other, and so that the recesses are joined to each other to serve as the opening.

Assignees

• Kanzaki Kokyukoki Mfg Co Ltd

Inventors

• Yasuda Toshifumi
• Murashima Daisuke
• Iwaki Koji
• Maehara Hiroki
• Yamane Koga

Classifications

• B60K17/105

  Units comprising at least a part of the gearing and a torque-transmitting axle, e.g. transaxles (B60K17/14 takes precedence) · CPC title

• F16H57/02

  Gearboxes; Mounting gearing therein · CPC title

• F16H57/0457 Primary

  Splash lubrication · CPC title