A variable output assembly including a hydraulic pump disposed on a pump running surface located on a center section, end cap or other hydraulic mounting member. The pump may be a gerotor or other rotatable pump body. A support member is disposed between the pump running surface and the pump and inc
A variable output assembly including a hydraulic pump disposed on a pump running surface located on a center section, end cap or other hydraulic mounting member. The pump may be a gerotor or other rotatable pump body. A support member is disposed between the pump running surface and the pump and includes a pump support surface having openings to permit fluid communication between the support member and the pump running surface. The support member is movable between neutral and a plurality of positions corresponding to forward and reverse directions of the output. In forward and reverse positions, the support member permits fluid communication between the pump and a first porting system, and in the neutral position the support member permits fluid communication between the pump and a sump through the support surface openings and a second porting system.
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1. A drive system, comprising: an input shaft driven by a prime mover and extending into a housing, the input shaft having a first axis of rotation;a hydraulic mounting member disposed in the housing and having a first surface and hydraulic porting connected to the first surface and to a sump;a hydr
1. A drive system, comprising: an input shaft driven by a prime mover and extending into a housing, the input shaft having a first axis of rotation;a hydraulic mounting member disposed in the housing and having a first surface and hydraulic porting connected to the first surface and to a sump;a hydraulic pump assembly disposed on the first surface and comprising a gerotor pump rotatably positioned on a gerotor support member, the gerotor support member having a plurality of openings formed therein and wherein the gerotor support member is movable between a plurality of positions with respect to the hydraulic mounting member;a hydraulic motor assembly disposed in the housing and driven by the gerotor pump; andan axle driven by the hydraulic motor assembly and extending out of the housing. 2. The drive system of claim 1, wherein the hydraulic porting comprises a first pair of hydraulic passages extending from the first surface of the hydraulic mounting member, and a second pair of hydraulic passages extending from the first surface to the sump; and wherein the plurality of positions comprises at least one first position where the gerotor support member permits fluid communication between the gerotor pump and the first pair of hydraulic passages through at least one of the plurality of openings, and at least one second position where the gerotor support member permits fluid communication between the gerotor pump and the sump through at least one of the plurality of openings and the second pair of hydraulic passages. 3. The drive system of claim 2, wherein the sump is disposed in the housing and comprises a main sump and a filter sump connected to the main sump. 4. The drive system of claim 3, wherein the filter sump is formed by a filter member connected to a bottom surface of the hydraulic mounting member, opposite to the first surface. 5. The drive system of claim 2, wherein the gerotor support member comprises a cup having a generally flat surface on which the gerotor pump is disposed and a side surface forming a cylinder, and further comprising a cover that cooperates with the cup to enclose the gerotor pump, wherein the cover is secured to the hydraulic mounting member and the cup is retained between the cover and the hydraulic mounting member. 6. The drive system of claim 1, wherein the hydraulic motor assembly is engaged to and drives a motor shaft that has a second axis of rotation that is perpendicular to the first axis of rotation. 7. The drive system of claim 6, wherein the hydraulic motor assembly is disposed on a second surface formed on the hydraulic mounting member generally perpendicular to the first surface, and the axle has a third axis of rotation that is parallel to the second axis of rotation. 8. The drive system of claim 6, wherein the sump is disposed in the housing and comprises a main sump and a filter sump connected to the main sump, wherein the filter sump is formed by a filter member connected to a bottom surface of the hydraulic mounting member, opposite to the first surface. 9. The drive system of claim 8, wherein the hydraulic porting further comprises a first pair of hydraulic passages extending from the first surface of the hydraulic mounting member, and a second pair of hydraulic passages, the drive system further comprising a first check valve connecting one of the second pair of hydraulic passages with the filter sump and a second check valve connecting the other of the second pair of hydraulic passages with the filter sump. 10. A drive system, comprising: an input shaft driven by a prime mover and extending into a housing, the input shaft having a first axis of rotation;a hydraulic pump assembly disposed in the housing and hydraulically connected to a first pair of hydraulic passages and a second pair of hydraulic passages;a sump hydraulically connected to the second pair of hydraulic passages; anda proportional valve located between the hydraulic pump assembly and the first and second pairs of hydraulic passages; anda hydraulic motor assembly driven by the hydraulic pump assembly. 11. The drive system of claim 10, further comprising an axle driven by the hydraulic motor assembly and extending out of the housing, wherein the hydraulic motor assembly is engaged to and drives a motor shaft that has a second axis of rotation that is perpendicular to the first axis of rotation and the axle has a third axis of rotation that is parallel to the second axis of rotation. 12. The drive system of claim 11, further comprising a hydraulic mounting member disposed in the housing, wherein the hydraulic pump assembly and the proportional valve are disposed on a first surface formed on the hydraulic mounting member, and the hydraulic motor assembly is disposed on a second surface formed on the hydraulic mounting member, and the first surface is generally perpendicular to the second surface, and the first pair of hydraulic passages and the second pair of hydraulic passages are formed in the hydraulic mounting member and connected to the first surface. 13. The drive system of claim 12, wherein the sump comprises a main sump and a filter sump connected to the main sump through a filter, wherein the filter sump is formed by a filter member connected to a third surface of the hydraulic mounting member, opposite to the first surface. 14. The drive system of claim 13, further comprising a first check valve to connect one of the second pair of hydraulic passages to the filter sump and a second check valve to connect the other of the second pair of hydraulic passages to the filter sump. 15. The drive system of claim 11, wherein the hydraulic pump assembly comprises a gerotor and the proportional valve comprises a movable portion on which the gerotor rotates and a plurality of openings formed in the movable portion to interface with at least two of the passages in the first and second pairs of hydraulic passages. 16. A drive system comprising: an input shaft driven by a prime mover and extending into a housing, the input shaft having a first axis of rotation;a hydraulic pump assembly disposed in the housing on a first surface and driven by the input shaft, the hydraulic pump assembly comprising a pump body and a support member disposed between the first surface and the pump body, the support member comprising a pump surface and a plurality of openings formed in and extending through the pump surface to permit fluid communication between the support member and the first surface;a first porting system in fluid communication with the first surface and with the pump body through the support member; anda sump hydraulically connected to the first surface by a second porting system;wherein the support member is movable between a plurality of positions, the plurality of positions including at least one first position where the support member permits fluid communication between the hydraulic pump assembly and the first porting system and at least one second position where the support member permits fluid communication between the hydraulic pump assembly and the sump through the second porting system; anda motor assembly driven by the hydraulic pump assembly, the motor assembly engaged to and driving an axle that extends out of the housing, wherein the axle has a second axis of rotation. 17. The drive system of claim 16, further comprising a hydraulic mounting member, where the first surface is formed thereon, and the first and second porting systems are integrally formed therein, and the pump body comprises a gerotor and the support member comprises a cup and a cover secured to the cup to encapsulate the gerotor. 18. The drive system of claim 17, wherein the sump comprises a main sump and a filter sump connected to the main sump through a filter member, and the filter sump is formed by the filter member connected to a bottom surface of the hydraulic mounting member, opposite to the first surface. 19. The drive system of claim 18, wherein the motor assembly is engaged to and drives a motor shaft, and the motor assembly is a gerotor motor disposed on a second surface formed on the hydraulic mounting member generally perpendicular to the first surface, and the second axis of rotation is perpendicular to the first axis of rotation. 20. The drive system of claim 19, wherein the first porting system comprises a first pair of hydraulic passages extending from the first surface of the hydraulic mounting member, and the second porting system comprises a second pair of hydraulic passages extending from the first surface to the sump; and wherein in the at least one first position the support member permits fluid communication between the pump body and the first pair of hydraulic passages through at least one of the plurality of openings, and in the at least one second position the support member permits fluid communication between the pump body and the sump through at least one of the plurality of openings and the second pair of hydraulic passages.
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이 특허에 인용된 특허 (8)
Horton Todd (Bethany IL) Bennett Michael (Bethany IL), Combination valve including improved neutral valve for use in hydrostatic transmission.
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