Claims
- 1. An axle driving apparatus comprising:a housing, an inner space of said housing serving as a fluid sump; a center section disposed in said housing, said center section forming therein a pair of fluid passages serving as a closed circuit fluidly connecting a hydraulic pump and a hydraulic motor with each other; a movable swash plate disposed in said housing for adjusting an amount of fluid discharged from said hydraulic pump; a pivotal control arm disposed in said housing for operating said swash plate, said control arm including a fluid groove in constant communication with said fluid sump; a pair of orifices, wherein either of said orifices is brought into communication with said fluid groove of said control arm when said control arm is located in a certain range, and a pair of check valves, each of said check valves being interposed between each of said orifices and each of said fluid passages, wherein said check valves allow fluid to flow from said pair of oil passages to said pair of orifices, and stop flow of fluid from said pair of orifices to said pair of oil passages.
- 2. The axle driving apparatus as set forth in claim 1, further comprising:a pair of pistons provided therein with said respective orifices, wherein said pair of pistons are axially slidably inserted in said center section and are biased so as to slidably and constantly abut against said control arm.
- 3. The axle driving apparatus as set forth in claim 2, wherein said pair of check valves are disposed in said respective pistons.
- 4. The axle driving apparatus as set forth in claim 2, wherein said pair of check valves are disposed in said center section so that each of said check valves is located between each of said pistons and each of said fluid passages.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-166225 |
Jun 1996 |
JP |
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REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 09/551,532; filed Apr. 18, 2000, which is a continuation-in-part of application Ser. No. 09/192,315; filed Nov. 16, 1998, now U.S. Pat. No. 6,109,032 which is a continuation-in-part of application Ser. No. 08/872,672; filed Jun. 11, 1997 now U.S. Pat. No. 5,836,159. The disclosures of the above-identified applications are incorporated in their entirety by reference hereto.
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Continuation in Parts (3)
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09/551532 |
Apr 2000 |
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Child |
09/691137 |
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Parent |
09/192315 |
Nov 1998 |
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09/551532 |
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08/872672 |
Jun 1997 |
US |
Child |
09/192315 |
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US |