A hydrostatic transaxle with a bypass mechanism is disclosed, the transaxle having a center section engaged to a housing, an axial piston pump disposed on the center section and driven by an input shaft, and an axial piston motor disposed on the center section having a cylinder block engaged to a mo
A hydrostatic transaxle with a bypass mechanism is disclosed, the transaxle having a center section engaged to a housing, an axial piston pump disposed on the center section and driven by an input shaft, and an axial piston motor disposed on the center section having a cylinder block engaged to a motor output shaft. The pump is controlled by a swash plate having a pair of openings through which the input shaft and a bypass actuation rod pass. The bypass actuation rod has a cam formed on a first end that engages a block lift member. When the bypass actuation rod is rotated, the cam causes the block lift member to engage and lift the cylinder block of the axial piston motor off of the center section. A brake mechanism using brake puck disposed in a pocket formed in the center section is also disclosed.
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1. A drive apparatus comprising: a housing forming a sump;an axial piston pump located in the sump and hydraulically connected to a hydraulic motor through a hydraulic circuit;a swash plate rotatably disposed in the housing and engaged to the axial piston pump for varying the output thereof;a bypass
1. A drive apparatus comprising: a housing forming a sump;an axial piston pump located in the sump and hydraulically connected to a hydraulic motor through a hydraulic circuit;a swash plate rotatably disposed in the housing and engaged to the axial piston pump for varying the output thereof;a bypass mechanism disposed in the housing to open the hydraulic circuit to place the drive apparatus into a bypass state where the hydraulic circuit is open to the sump; anda bypass actuation rod having a first end engaged to the bypass mechanism and being capable of actuating the bypass mechanism, wherein the bypass actuation rod extends through an opening in the swash plate and out of the housing. 2. The drive apparatus of claim 1, wherein the first end of the bypass actuation rod is formed as a cam. 3. The drive apparatus of claim 1, further comprising an input shaft extending into the housing and driving the axial piston pump, wherein the bypass actuation rod is oriented generally parallel to the input shaft. 4. The drive apparatus of claim 1, further comprising a center section disposed in the housing, wherein the hydraulic circuit is integrally formed in the center section, and the pump and the hydraulic motor are both rotatably disposed on the center section. 5. The drive apparatus of claim 4, further comprising a motor output shaft driven by the hydraulic motor; and a brake mechanism for providing a braking force to the motor output shaft, comprising a brake shaft extending through the housing and having a proximal end disposed proximate to one side of a brake rotor, and a brake puck disposed in a brake puck pocket formed in the center section, proximate to a second side of the brake rotor. 6. The drive apparatus of claim 5, wherein the hydraulic motor is an axial piston motor. 7. A drive apparatus, comprising: a hydraulic mounting member disposed in a housing, the hydraulic mounting member comprising a motor running surface connected to a hydraulic porting system forming a hydraulic circuit;a hydraulic motor disposed on the motor running surface and in fluid communication with a hydraulic pump through the hydraulic porting system;a motor output shaft driven by the hydraulic motor; anda brake mechanism for providing a braking force to the motor output shaft, comprising a brake shaft extending through the housing and having a first end disposed proximate to one side of a brake rotor, and a brake puck disposed in a brake puck pocket formed in the hydraulic mounting member, proximate to a second side of the brake rotor. 8. The drive apparatus of claim 7, further comprising a cam formed on an internal surface of the housing to move the brake shaft into contact with the brake rotor, bringing the brake rotor into frictional engagement with the brake puck, when the brake shaft is rotated. 9. The drive apparatus of claim 7, wherein the brake puck is located opposite the brake shaft, and the braking force is transmitted along an axis of rotation of the brake shaft. 10. The drive apparatus of claim 7, wherein the hydraulic mounting member further comprises a first bore disposed on one side thereof and a second bore disposed on a second side thereof, opposite the first side, wherein the motor output shaft is supported by both the first bore and the second bore. 11. The drive apparatus of claim 10, wherein the hydraulic mounting member further comprises a first check plug port and a second check plug port located on the second side thereof, wherein the first check plug port and the second check plug port are both in fluid communication with the hydraulic porting system and a sump formed in the housing, and wherein the first check plug port, the second check plug port and the second bore form a triangular shape. 12. The drive apparatus of claim 11, wherein the brake puck pocket is located adjacent to one of the first check plug port or the second check plug port. 13. The drive apparatus of claim 7, further comprising an axial piston pump mounted on a pump running surface formed on the hydraulic mounting member and a swash plate engaged to the axial piston pump for varying the output thereof, wherein the housing comprises a main housing and a side housing, and the swash plate is rotatably supported by both the main housing and the side housing. 14. The drive apparatus of claim 13, wherein the motor output shaft is directly engaged to and driven by the hydraulic motor, and one end of the motor output shaft extends into a motor shaft support pocket formed in the side housing. 15. The drive apparatus of claim 7, wherein the motor output shaft is directly engaged to and driven by the hydraulic motor. 16. The drive apparatus of claim 15, wherein the brake rotor is disposed about and slidingly engaged to the motor output shaft. 17. A drive apparatus, comprising: a housing forming a sump;a center section disposed in the sump and comprising: a first side, a second side perpendicular to the first side and a third side parallel and opposite to the second side;a pump running surface formed on the first side and having a first fluid port and a second fluid port;a motor running surface formed on the second side and having a third fluid port and a fourth fluid port;a hydraulic porting system disposed internal to the center section to form a hydraulic circuit to connect the pump running surface and the motor running surface;a first bore formed on the second side, between the third fluid port and the fourth fluid port; anda second bore formed on the third side, wherein the first bore and the second bore are coaxial;a first check plug port and a second check plug port formed on the third side adjacent to the second bore, wherein the first check plug port and the second check plug port are both in fluid communication with the hydraulic porting system and the sump, wherein the first check plug port, the second check plug port and the second bore form a triangular shape on the third side;a hydraulic motor disposed on the motor running surface and in fluid communication with a hydraulic pump disposed on the pump running surface through the hydraulic porting system; anda motor output shaft engaged to the hydraulic motor to be driven thereby, wherein the motor output shaft extends into and is supported by the first bore and the second bore. 18. The drive apparatus of claim 17, further comprising: a brake puck pocket formed in the third side of the center section, and a brake puck disposed in the brake puck pocket;a brake rotor disposed about and slidingly engaged to the motor output shaft, the brake rotor having a first side adjacent to the brake puck and a second side, opposite the first side; anda brake shaft extending through the housing and having a first end disposed proximate to the second side of the brake rotor. 19. The drive apparatus of claim 18, wherein the brake puck pocket is located adjacent to one of the first check plug port or the second check plug port. 20. The drive apparatus of claim 17, further comprising: a swash plate rotatably disposed in the housing and engaged to the hydraulic pump for varying the output thereof;a bypass mechanism disposed in the housing to open the hydraulic circuit to place the drive apparatus into a bypass state where the hydraulic circuit is open to the sump; anda bypass actuation rod having a first end engaged to the bypass mechanism and being capable of actuating the bypass mechanism, wherein the bypass actuation rod extends through an opening in the swash plate and out of the housing.
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