Hydrostatic transaxle

摘要

A hydraulic drive unit having a center section for a hydraulic pump and hydraulic motor mounted in a casing. The center section includes a cylindrical protuberance for locating the center section in the casing, and at least one fastener opening formed in the center section for receiving a fastener engaged to the casing. The drive unit may also include a pair of flat surfaces formed on the center section and adapted to mount with features in the casing, and a bypass shaft extending into the casing and at least partially disposed in the center section.

主权项

1. A drive system, comprising:
a first transaxle comprising a first main casing joined to a first side casing to form a first sump, a first hydraulic pump disposed in the first sump and driven by a first input shaft, a first hydraulic motor disposed in the first sump and hydraulically connected to the first hydraulic pump, the first hydraulic motor having a first motor shaft drivingly linked to a first axle shaft, wherein the first motor shaft has a first axis of rotation; a second transaxle comprising a second main casing joined to a second side casing to form a second sump, a second hydraulic pump disposed in the second sump and driven by a second input shaft, a second hydraulic motor disposed in the second sump and hydraulically connected to the second hydraulic pump, the second hydraulic motor having a second motor shaft drivingly linked to a second axle shaft, wherein the second motor shaft has a second axis of rotation that is collinear with the first axis of rotation; wherein the first motor shaft extends from the first side casing towards the second side casing and the second motor shaft extends from the second side casing towards the first side casing; and a first brake mechanism disposed external to the first sump and attached to the first motor shaft, and a second brake mechanism disposed external to the second sump and attached to the second motor shaft.