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In an exhaust control valve having a valve housing and a valve body rotatably contained in the valve housing, a transmission member is fitted to an outer end of the valve shaft and protrudes from the outside of the valve housing. A bearing bushing for rotatably bearing an external circumferential su

In an exhaust control valve having a valve housing and a valve body rotatably contained in the valve housing, a transmission member is fitted to an outer end of the valve shaft and protrudes from the outside of the valve housing. A bearing bushing for rotatably bearing an external circumferential surface of the valve shaft by its internal circumferential surface and rotatably bearing an end face of the valve body by its end face is mounted in the valve housing. The valve body is urged by load from a thrust spring for achieving a pressure contact seal condition between the opposed end faces of the bearing bush and the valve body.

대표청구항 ▼

In an exhaust control valve having a valve housing and a valve body rotatably contained in the valve housing, a transmission member is fitted to an outer end of the valve shaft and protrudes from the outside of the valve housing. A bearing bushing for rotatably bearing an external circumferential su

In an exhaust control valve having a valve housing and a valve body rotatably contained in the valve housing, a transmission member is fitted to an outer end of the valve shaft and protrudes from the outside of the valve housing. A bearing bushing for rotatably bearing an external circumferential surface of the valve shaft by its internal circumferential surface and rotatably bearing an end face of the valve body by its end face is mounted in the valve housing. The valve body is urged by load from a thrust spring for achieving a pressure contact seal condition between the opposed end faces of the bearing bush and the valve body. linders. 6. The self propelled mowing machine of claim 1, wherein the means for driving the self-propelled mowing machine comprises at least one ground drive motor attached to each frame and operably connected to a drive wheel and to the control means. 7. The self propelled mowing machine of claim 1, wherein the cutting means comprises at least one mower blade, and wherein each mower deck comprises a housing, and a motor operably connected to one of the at least one mower blades and to the control means. 8. The self propelled mowing machine of claim 1, wherein the mower platform is disposed in a lateral space between the vertical frames, such that when the mower platform is passed over the plurality of nursery products for trimming, the vertical frames straddle the plurality of nursery products. 9. The self propelled mowing machine of claim 1, further comprising a seat mounted on the platform for receiving a mowing machine operator. 10. The self propelled mowing machine of claim 1, further comprising a cutter collection bag attached to each mower deck for collecting the nursery product trimmings. 11. A self propelled, steerable, vertically adjustable, hydraulicly driven, ganged mowing machine for the trimming of nursery products, the machine comprising: right and left vertical frames, each frame including a traction drive motor operably connected to a drive wheel for driving the self-propelled mowing machine, each frame further including at least one hydraulic cylinder; an elongated platform having right and left sides, the right and left sides being operably connected to the right and left vertical frames respectively via the at least one hydraulic cylinders, wherein the horizontal platform may move upwardly with respect to the vertical frames upon actuation of the hydraulic cylinders; the elongated horizontal platform including; a plurality of mower decks arranged in a predetermined manner, wherein each mower deck includes a hydraulic motor, each hydraulic motor being operatively connected to a mower blade for driving the mower blade; a prime mover, the prime mover driving a plurality of hydraulic pumps; wherein at least one of the hydraulic pumps is connected in K fluid circuit with the hydraulic motors for driving the mower blades; wherein at least one of the hydraulic pumps is connected in fluid circuit with the traction motors for driving the motors; wherein at least one of the hydraulic pumps is connected in fluid circuit with the hydraulic cylinders for operating the hydraulic cylinders; and control means for driving the self-propelled mower, for controlling the height of the horizontal platform, and for engaging the motors for driving the mower blades. 12. The self propelled mowing machine of claim 11, wherein the mower decks are arranged in a first row and a second row, wherein the second row is arrayed behind the first row and the decks of the second row are horizontally offset from the decks of the first row. 13. The self propelled mowing machine of claim 12, wherein each mower deck further comprises a housing, and wherein the hydraulic motor of each mower deck is operatively connected to the control means. 14. The ganged mowing machine of claim 13, wherein the hydraulic motors of the first row of mower decks are series connected in a first hydraulic circuit, wherein the first hydraulic circuit includes a first hydraulic pump driven by the prime mover, and wherein the hydraulic motors of the second row of mower decks are series connected in a second hydraulic circuit, wherein the second circuit includes a second hydraulic pump driven by the prime mover. 15. The ganged mowing machine of claim 14, wherein the first hydraulic circuit includes a solenoid valve in the fluid line between the first pump and the first row of series connected motors, the solenoid valve being switchable between a supply line to the hydraulic motors and a drain line, and wherein the second hydraulic circuit includes a solenoid valve in the fluid line between the second pump and the second row of series connected motors, the solenoid valve being switchable between a supply line to the hydraulic motors and a drain line. 16. The ganged mowing machine of claim 15, wherein each solenoid valve is operably connected to a driver operated foot pedal, wherein the mower decks operate only when the foot pedal is depressed. 17. The ganged mowing machine of claim 16, wherein the first and second hydraulic circuits each further include a pressure relief valve located in their respective fluid paths between their respective pumps and respective solenoid valves. 18. The ganged mowing machine of claim 17, wherein the plurality of hydraulic pumps are connected in series, and wherein the first and second hydraulic circuits each include a pressure relief valve located in the fluid path between a first and a second pump of the series connected pumps in each fluid circuit. 19. The ganged mowing machine of claim 14, wherein the first and second hydraulic circuits further include a fluid circulation loop with a one way check valve, wherein the circulation loop prevents the series connected pumps from running dry of fluid after fluid shutoff. 20. The ganged mowing machine of claim 11, wherein the at least one hydraulic cylinder interconnected between each frame and the mower platform, are each driven by one of the pumps driven by the prime mover, the pump being connected to a control valve, the control valve distributing pressurized fluid to each hydraulic cylinder, the valve being operable by a driver, wherein the driver may raise and lower the mower platform by adjusting the valve. 21. The ganged mowing machine of claim 11, wherein each traction motor is independently driven by a separate pump, each pump being independently controllable. 22. A self propelled mowing machine for the trimming of nursery products comprising: right and left vertical frames; a mower platform having a right end and a left end, wherein the right and left frames are slidably connected to the right end and the left end, respectively, of the mower platform, the platform being vertically adjustable with respect to the ground, and wherein the platform further comprises vertically movable therewith a plurality of mower decks for trimming the plurality of nursery products extending in a horizontal plane for trimming a plurality of nursery products and control means for control of the self-propelled mowing machine, and means for vertically adjusting the platform; and at least one hydraulic ground drive motor attached to each frame, and operably connected to a drive wheel and to the control means for providing ground drive of the mowing machine. 23. A self propelled mowing machine for the trimming of nursery products comprising: right and left vertical frames; and a mower platform attached between the vertical frames, the mower platform being vertically adjustable with respect to the ground and including a plurality of mower decks mounted for vertical movement with the platform and extending in a horizontal plane for trimming a plurality of nursery products, wherein each frame includes a traction drive motor operably connected to a drive wheel for driving the self-propelled mowing machine and at least one hydraulic cylinder for vertically adjusting the platform with respect to the ground. 24. A self propelled mowing machine for the trimming of nursery products comprising: right and left vertical frames; a mower platform attached between the vertical frames, the mower platform being vertically adjustable with respect to the ground and including a plurality of mower decks mounted for vertical movement with the platform and extending in a horizontal plane for trimming a plurality of nursery products; and a seat mounted on the platform for receiving a mowing machine operator. 25. A self propelled mowing machine for the trimming of nursery products comprising: right and left vertical fram