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An expansion chamber for a hydrostatic transaxle to provide for expansion of the hydraulic oil during operation of the transaxle, where the expansion chamber is formed as part of the housing inside the main sump by ribs or other members extending from the housing and is closed by a cap to form a sea

An expansion chamber for a hydrostatic transaxle to provide for expansion of the hydraulic oil during operation of the transaxle, where the expansion chamber is formed as part of the housing inside the main sump by ribs or other members extending from the housing and is closed by a cap to form a sealed chamber. A siphon tube may be secured to the cap or integrally formed therein, or formed by additional cast ribs or similar features formed into the housing and also sealed by the cap.

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We claim: 1. An axle driving apparatus comprising: a housing forming an internal volume; a separate plate having a first side and a second side attached to an internal surface of the housing to partition the internal volume into a first sump and a second sump, wherein the first sump fluidly communi

We claim: 1. An axle driving apparatus comprising: a housing forming an internal volume; a separate plate having a first side and a second side attached to an internal surface of the housing to partition the internal volume into a first sump and a second sump, wherein the first sump fluidly communicates only with the second sump and the second sump is vented externally to the unit and wherein hydraulic fluid level in the second sump is lower than the hydraulic fluid level in the first sump; and a siphon extending between the first sump and the second sump so that, as hydraulic fluid expands or contracts in the first sump, hydraulic fluid moves between the first and second sumps. 2. The axle driving apparatus of claim 1, wherein the siphon is formed as a part of the plate. 3. The axle driving apparatus of claim 2, wherein the siphon is formed as a tube on the first side of the plate. 4. The axle driving apparatus of claim 2, wherein the siphon is formed as a tube on the second side of the plate. 5. The axle driving apparatus of claim 1, wherein the siphon is formed as a passage by the plate and ribs formed on the internal surface of the housing. 6. The axle driving apparatus of claim 1, further comprising a hydrostatic transmission mounted in the housing and an axle driven by the hydrostatic transmission. 7. The axle driving apparatus of claim 1, wherein a portion of the axle is located adjacent to the second sump. 8. The axle driving apparatus of claim 1, wherein the plate comprises a magnet. 9. The axle driving apparatus of claims 8, wherein the magnet is located on the first side of the plate. 10. An axle driving apparatus comprising: a housing having a first part and a second part joined along a junction surface; a separate plate having a first side and a second side attached to an internal surface of the housing and parallel to the junction surface to partition the housing into a first sump and a second sump; wherein the first sump fluidly communicates only with the second sump, and wherein the hydraulic fluid level in the second sump is lower than the hydraulic fluid level in the first sump; and a siphon extending between the first sump and the second sump so that hydraulic fluid moves between the first and second sumps as it expands or contracts in the first sump. 11. The axle driving apparatus of claim 10, wherein the second sump is defined by a rib formed within the housing. 12. The axle driving apparatus of claim 10, wherein the siphon is a passage formed by housing ribs and the plate. 13. The axle driving apparatus of claim 10, wherein the siphon is formed as a tube on the plate. 14. An axle driving apparatus comprising: a housing having a first member joined to a second member to form a first sump; a chamber defined within the first housing member; a plate covering the chamber to define a second sump; a siphon extending between the first sump and the second sump; and an opening formed in the first housing member to form a vent between the second sump and the exterior of the housing. 15. The axle driving apparatus of claim 14, wherein the siphon is a passage formed by ribs in the housing and the plate. 16. The axle driving apparatus of claim 14, wherein the siphon is a tube located on the plate. 17. The axle driving apparatus of claim 14, wherein the chamber is generally adjacent to an axle shaft. 18. An axle driving apparatus comprising: a housing comprising at least two housing members joined together along a split line to form an oil sump; a hydrostatic transmission mounted in the housing; at least one axle extending out of the housing, wherein the longitudinal axis of the axle is perpendicular to the housing split line; a plate member secured to an internal surface of one of the housing members to form an expansion area separate from the oil sump, where the plate member has a generally flat outer surface and the plate member is mounted parallel to the housing split line; and a siphon associated with the plate member to permit fluid communication between the oil sump and the expansion area. 19. An axle driving apparatus as set forth in claim 18, wherein the hydrostatic transmission further comprises a hydraulic pump driven by an input shaft, wherein the longitudinal axis of the input shaft is generally parallel to the plate member. 20. An axle driving apparatus as set forth in claim 18, wherein the siphon is integrally formed on the plate member.