MXPA99001581A - Pto unit that has a flange paramontar an integ pump - Google Patents

Abstract

A PTO unit includes a cavity housing having an input shaft, a free shaft, and an output shaft supported therein. The input shaft is supported in the housing and carries an input mechanism therein which is adapted to be rotationally driven by a motor, transmission or other rotating power source. The free shaft is supported in the housing and carries a stump mechanism therein meshing with the input mechanism as well as to be rotatably actuated therein. A first end of the output shaft is supported in a suspension side wall internally integrally formed with the housing. A second end of the output shaft is supported in a support valve secured around an opening formed through a second side wall of the housing. A clutch assembly can be provided by a selectively connection of the trunnion mechanism of the output shaft. A mounted flange is formed integrally with the housing around the suspension side wall internally and is adapted to facilitate coupling of the driven accessory directly thereto. The mounted flange can be included to a flat mounted surface having a pair of openings formed therethrough. The assembled flange may further include an annular stepped suspension extending through the suspension side wall internally of the housing which functions as an opening pilot to facilitate mounting of the driven accessory in the housing of the power take-off unit and Ensure that the input shaft of the driven accessory is coaxial with the output shaft of the PTO unit. The housing of the PTO unit significantly reduces the amount of physical space occupied by the PTO unit and the driven accessory, and also improves the flexibility of placing the driven accessory relative to the power take-off unit.

Description

PTO UNIT WHICH HAS A FLANGE TO ASSEMBLE A COMPREHENSIVE PUMP BACKGROUND OF THE INVENTION This invention relates generally to power take-off units selectively providing rotary power to a driven accessory provided in a motor driven vehicle. More specifically, this invention relates to an improved structure for mounting an accessory operated on such a power take-off unit. PTO units are well known in mechanical devices that are commonly used in conjunction with rotating power sources, such machines and vehicle transmissions, for rotationally driven driven accessories. For example, the power take-off unit is commonly used in a variety of industrial and agricultural vehicles to operate rotating hydraulic pumps, hydraulically actuated devices, operators such as routers, waste compactors, vacuum mechanisms, lathes, and the like. A typical PTO unit includes a rigid housing that is mounted in a vehicle transmission case. The housing coupling surfaces of the power take-off unit and the transmission case having relatively elongated openings formed therethrough. The housing of the power take-off unit rotatably supports an input mechanism, an output mechanism that meshes with the input gear, and an input shaft that is adapted to be connected to the drive device. The input mechanism of the power take-off unit is supported rotates in relation to the housing, such that a portion thereof extends outwardly through the openings in the engagement coupling with one of the transmission gears which are constantly directed. by a vehicle engine. As a result, the input mechanism and output mechanism of the PTO unit is constantly steered by the transmission mechanism and thus the vehicle engine. At some times, the output mechanism is directly connected to the output shaft such that the output shaft is also constantly driven. At another time, however, an assembled clutch is provided to selectively connect the output mechanism to the output shaft to allow intermittent operation of the driven accessory. Alternatively, a plurality of differently measured input and output mechanisms may be supported within the housing of the power take-off unit as well as to provide a plurality of ratios of speed reduction mechanisms between the input mechanism and the input shaft when the clutch assembly is engaged. The input mechanism is usually rotatably supported between a non-rotatable input shaft that is connected within the housing of the power take-off unit. The non-rotatable input shaft ends are supported within the respective bores formed through the housing of the power take-off unit. The ends of the rotary output shafts, however, are rotatably supported on annular supports which are supported on the housing of the power take-off unit. To facilitate assembly and maintenance, the opposite sides of the PTO unit housing removed, and the respective support valves are secured to the housing by threaded fasteners to close the open sides thereof. The support valves have central openings formed therein which respectively support the annular supports therein. In this way, the ends of the output shaft are rotatably supported in the housing of the power take-off unit. Frequently, the driven accessory is itself supported in the housing of the power take-off unit to operate therein. To effect this, the outer surface of the support valves is formed by a flat mounted surface having a plurality of openings formed therethrough. A correspondingly mounted flat surface having a plurality of openings formed therethrough is formed in a mounted flange provided in the driven accessory. At some times, the driven accessory is supported in the housing of the power take-off unit by arranging the mounted surface of the fitting device in direct engagement with the mounted surface of the support valve, then securing the two together by fasteners threaded that extend through the respective openings. Although effective, this arrangement requires that the mounted surfaces of the support valve and the mounted flanges of the driven accessory have essentially the same shape. Consequently, a given structure for the support valve mounted on the surface can be accommodated only in a simple structure by the driven accessory of the mounted surface. To facilitate the use of a wide variety of structures for the mounted accessory of the mounted surface, an intermediate mounted glass adapter is usually connected between the mounted surface of the support valve and the mounted surface of the driven accessory. The adapted mounted flange includes a first mounted surface that is configured to cooperate with the mounted surface of the support valve and a second mounted surface that is configured to cooperate with the mounted surface of the accessory device. A plurality of relatively inexpensive mounted flange adapters can provide speed and ease by allowing a wide variety of mounted flange structures of various driven accessories to be supported on the support valve of the PTO unit.

As mentioned in the foregoing, the power take-off unit is frequently provided in a motor driven vehicle to selectively provide power to a driven accessory carried therein. In the past, more vehicles were designed to have a sufficient long amount of physical space adjacent to the transmission as well as to allow the power take-off unit and the driven accessory to be mounted therein without interference with other components of the vehicle. More recently, however, the amount of physical space available has decreased, creating problems of "potential interference with the other components of the vehicle when the PTO unit and the driven accessory are mounted therein. the assembled structures described above, (but with and without intermediate mounted adapters) have satisfactory functionality, it has been found that those that occupy a relatively large amount of physical space and, therefore, can not be used in some modern vehicles Furthermore, the various mechanisms of known PTO units are traditionally being supported on only the input shaft and the output shaft, this limits the flexibility to place the output shafts relative to the input shaft in those vehicles where the quantity of available physical space is limited. Eable to provide an improved structure for a PTO unit that minimizes the physical space occupied by it, and also that provides improved flexibility to place the output shaft relative to the input shaft, so allow the intake unit to Force and driven accessory are mounted on vehicles that have a limited amount of available physical space adjacent to the engine and transmission.

BRIEF DESCRIPTION OF THE INVENTION This invention relates to an improved structure for mounting a driven accessory in a power take-off unit as well as facilitating the assembly of the power take-off unit and the driven accessory in the vehicle having a limited amount of power. available physical space adjacent to the engine and transmission. The PTO unit includes a quantity of housing having an input shaft, a free shaft, and an output shaft supported therein. The input shaft is supported in the housing and carries an input mechanism therein which is adapted to be rotatably driven by a motor, transmission or other rotating power source. The free shaft is supported in the housing and carries a pinion mechanism therein meshing with the input mechanism that is to be rotatably actuated therein. A first end of the output shaft is supported on a side wall stopped in the interior formed integrally with the housing. A second end of the output shaft is supported with a support valve secured around an opening formed through a second side wall of the housing. An assembled clutch can be provided by selectively connecting the pinion mechanism to the output shaft. A mounted flange is formed integrally with the housing around the side wall stopped in the interior and is adapted to facilitate coupling to the accessory driven directly thereto. The mounted flange can be included to a flat mounted surface having a pair of openings formed therethrough. The assembled flanges can be included in an annular step suspension which extends through the suspension side wall internally of the housing which functions as an open pilot to facilitate the assembly of the driven accessory in the housing of the power take-off unit and Ensure that the input shaft of the driven accessory is coaxial with the output shaft of the PTO unit. The housing of the PTO unit significantly reduces the amount of physical space occupied by the PTO unit and the driven accessory, and also improves the flexibility of placement of the accessory operated in relation to the PTO unit. Various objects and advantages of this invention may be apparent to those skilled in the art from the following detailed description of the preferred embodiment when reading in clear the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a first embodiment of a power take-off unit having a driven accessory mounted thereon in accordance with this invention.

Figure 2 is an exterior elevation view of the first embodiment of the power take-off unit illustrated in Figure 1, wherein the driven accessory is being removed to be clear. Figure 3 is a side elevation view of the first embodiment of the power take-off unit in Figure 2. Figure 4 is a sectional elevation view of the first embodiment of the power take-off unit along the line 4-4 of Figure 3.

DETAILED DESCRIPTION OF THE PREFERRED MODE With reference now to the drawings, a first embodiment of a power take-off unit indicated generally at 10, according to this invention, are illustrated in Figures 1, 2 and 3. The structure and mode of operation of the power take-off unit 10 must be explained in detail in the following. A driven accessory 11 is secured to the power take-off unit 10 in a conventional manner. In the illustrated embodiment, the driven accessory 11 is a hydraulic pump which when operated in the manner described in the following, generates a flow of hydraulic fluid to a hydraulically actuated device (not shown), such as a router, a hydraulic compactor waste, a suction mechanism, or a lathe. However, it should be appreciated that any known actuated accessory 11 can be used with the PTO unit 10 of this invention. PTO unit 10 illustrated includes a cavity housing 20 which is formed of a rigid, strong material, preferably metallic material. The housing structure 20 is better illustrated in Figure 4. As shown therein, a first portion of the housing 20 (the upper portion when viewed from Figure 4) includes a pair of sidewalls 20a and 20b. integrally with the rest of the housing 20 and having first and second holes 21 and 22 of the output shaft formed therethrough. The first and second holes 21 of the output shaft are coaxially preferred aligned with one another and are formed having approximately the same size. Opposite ends of a non-rotatable input shaft 23 are respectively received within the first and second input shaft bores 21 and 22 and are retained therein in any conventional manner. An input mechanism 25 is rotatably mounted on the input shaft 23 that can not be rotated by a pair of support rollers 26 and 27 or other conventional means. The input mechanism 25 includes a first portion of input mechanism 28 and a second portion 29 of input mechanism. The first portion of input mechanism 28 is adapted to be connected to a motor or transmission (not shown) of a vehicle or other rotary power source as well as to be rotatably driven in a conventional manner. As a result, the second portion 29 of the input mechanism is also rotatably driven. Through the first and second portions 28 and 29 of the input mechanism are shown being integrally formed one of the other, it should be appreciated that such mechanism portions 28 and 29 can be formed as separate components that are connected together by rotation conjunt amenté . A second portion of the housing 20 (the intermediate portion when viewed from Figure 4) includes a pair of opposite side walls 20c and 20d formed integrally with the rest of the housing 20 and having first and second bores 31 and 32 of the free shaft formed through it. Similar to the first and second bore holes 21 and 22, the first and second free-bore bores 31 and 32 are preferably coaxially aligned with one another and are formed having approximately the same size. The opposite ends of the non-rotatable free shaft 33 are received respectively within the first and second holes 31 and 32 being retained within any of the conventional shapes. A pinion mechanism 35 is rotatably mounted on the free shaft 33 not rotatable by a support roller 36 or other conventional means. The pinion mechanism 35 meshes with the second portion 29 of the input mechanism 25. This, when the input mechanism 25 is rotatably driven as described above, the pinion mechanism 36 is also rotatably driven. A third portion of the housing 20 (the lower portion when viewed from Figure 4) includes an integral internally suspended side wall 20e formed with the rest of the housing 20 and having a first output shaft bore 41 formed therethrough. The opposite side wall of the lower portion of the housing 20 is completely removed, thereby providing an elongated opening 42 relatively. The opening 42 is closed by a support valve 43 which is secured to the lower portion of the housing 20 by any conventional means. The support valves 43 are conventional in the art and have a second output shaft bore 44 formed therethrough. The outlet portion of the support valve 43 is closed by an end valve 45 which is secured to the support valve by any conventional means. The first output shaft bore 41 formed through the side wall 20e internally suspended from the lower portion of the housing 20 and the second output shaft bore 44 formed through the support valve 43 is preferably coaxially aligned with the first one. another and that has formed the same size approximately. The opposite ends of a rotatable output shaft 46 are respectively received within a pair of support rollers 47 and 48 or other conventional means disposed within the first and second output bores 41 and 44. The illustrated output shaft 46 is formed by having an end portion 46a in the internally slotted cavity which is adapted to cooperate with an externally slotted input shaft (not shown) provided in the driven accessory 11. Alternatively, the output shaft 46 may be mounted having a slot or an externally chameled portion (not shown) that is adapted to cooperate with an input shaft (not shown) provided in the driven accessory 11. Thus, the output shaft 46 is connected to operate the driven accessory 11. - PTO unit 10 includes a clutch assembly, generally indicated at 50, to selectively provide a directed connection between the input mechanism 25 and the output shaft 46. The clutch assembly 50 is conventional in the art and not forms part of this invention. When the clutch assembly 50 is engaged, the output shaft 46 is rotatably driven by the input mechanism 25 and the pinion mechanism 36. As a result, the driven accessory 11 is operated by a PTO unit 10. When the The clutch assembly 50 is uncoupled, the output shaft 46 is not rotationally driven by the input mechanism 25 and the pinion mechanism 36, and the driven accessory 11 is not operated by the PTO unit 10. As discussed in FIG. The above, the inner suspension side wall 20e is integrally formed by the outer portion of the housing 20. As best shown in Figures 3 and 4, a mounted flange, generally indicated at 51, is also integrally formed with the outside of the housing. lower portion of the housing 20. The mounted flange 51 is located near the side wall 20e of suspension internally to the housing 20 and is adapted to facilitate the coupling of the driven accessory 11 directly to it. For example, the mounted flange 51 illustrated includes a flat mounted surface 52 having a pair of openings 53 and 54 formed therethrough. The openings 53 and 54 are adapted to accommodate the respective threaded fasteners (not shown) for mounting the driven accessory 11 directly to the housing 20 of the PTO unit 10, as shown in Figure 1. The mounted flange 51 can also include a suspension annular shoulder 55 extending near the first output shaft bore 41 formed through the suspension side wall 20e internally of the housing 20. The stepped suspension 55 functions as an opening pilot to facilitate mounting to the driven accessory 11 in the housing 20 of the power take-off unit 10 and ensuring that the input shaft of the driven accessory 11 is coaxial with the output shaft 46. The housing 20 of the power take-off unit 10 of this invention provides significant significant advantages over the known PTO unit housings. First, as discussed in the above, traditionally has a conventional PTO unit that is being provided with two support valves to rotatably support the output shaft relative to the housing, and traditionally has the driven accessory that is being supported in one of such support valves (or on adapted flanges mounted connected to the support valves). This structure has been found to occupy a significant amount of physical space that, in some modern vehicles, can create problems of potential interference with other vehicle components. It can be significantly reduced by forming side walls 20e of suspension internally with the housing 20 of this invention and furthermore by forming flanges mounted 51 in erect with such housings 20, the amount of physical space that is occupied by the intake unit. of force 10 and the driven accessory 11. Second, as also discussed in the foregoing, a conventional PTO unit traditionally has to be provided with only one input shaft and one output shaft, so it limits the flexibility to place the output axis relative to the input axis to those applications where the physical space is limited. They are greatly improved by the proportion of free axles 33 and pinion mechanisms 35 intermediate to the input shaft 23 and the output shaft 46 of this invention, the options for positioning the output shaft 46 relative to the input shaft 23. Thus, the housing 20 of the power outlet unit 10 of this invention significantly reduces the amount of physical space occupied by the power take-off unit 10 and the driven accessory 11 and further improves the positioning flexibility of the driven accessory 11 relative to the unit PTO 10. In accordance with the provisions of the patent statutes. The principle and mode of operation of this invention has been explained and illustrated in this preferred embodiment. However, it should be understood that this invention can be practiced otherwise as explained and illustrated specifically without departing from this spirit and the canee.

Claims (10)

1. A power take-off unit adapted to connect a rotary power source to a driven accessory comprising: a cavity housing; an input shaft adapted to be connected to the rotating power source, the input shaft includes a first end supported within a first input shaft bore formed through a side wall integrally formed with the housing and a second end supported inside a second intake shaft bore formed through a side wall integrally formed with the housing; and an output shaft adapted to be connected to the driven accessory, the output shaft is rotatably driven by the input shaft and includes a first end supported within a first output shaft bore formed through a side wall integrally formed with the housing and a second end supported in a second output shaft bore formed through a support valve separable from the housing, the support valve is secured to the housing near an opening formed through a side wall thereof .

2. The power take-off unit defined in claim 1, wherein the input shaft carries an input mechanism that is adapted to be connected to the rotating power source, and the output shaft carries an output mechanism that is rotationally driven. by means of an input mechanism, such an output shaft is rotatably driven by an output mechanism.

3. The power take-off unit defined in claim 2 further includes an assembled clutch for selectively connecting to the output mechanism for rotationally driving the output shaft.

4. The power take-off unit defined in claim 1, wherein the first output shaft bore is formed through a side suspension wall internally of the housing.

5. The power take-off unit defined in claim 4, wherein the suspension side wall internally of the housing has a stepped suspension formed therein to facilitate assembly of the driven accessory of the housing.

6. The power take off unit defined in claim 1, further includes a free shaft having a first end supported on a first free shaft bore formed through the housing and a second end supported on a second free shaft bore formed through of the housing, such free shaft is rotatably driven by the input shaft, the output shaft is rotatably driven by the shaft lib e.

7. The power take-off unit defined in claim 6, wherein the input shaft carries an input mechanism that is adapted to be connected to the rotating power source, the free shaft carries a pinion mechanism which is rotatably driven by the Inlet mechanism, and such output shaft carries an output mechanism that is rotationally driven by the pinion mechanism, the output shaft is rotated by the output mechanism.

8. The power take-off unit defined in claim 7 further includes an assembled clutch for selectively connecting the rotary driven output mechanism to the output shaft.

9. A PTO unit for connecting a rotary power source to a driven accessory comprises: a cavity housing; an input shaft supported within the housing and adapted to be connected to the rotating source, the input shaft carries an input mechanism, a free shaft supported within the housing, the free shaft carries a pinion mechanism which is driven rotates by means of the input mechanism; and an output shaft supported within the housing and adapted to be connected to the driven accessory, the output shaft carrying an output mechanism that is rotatably driven by the pinion mechanism, the output shaft is rotatably driven by the output mechanism .

10. The power take-off unit defined in claim 9, wherein the input shaft includes a first end supported within a first input shaft bore formed through a side wall formed integrally with the housing and a second end supported within the bore. a second entry shaft bore through a side wall formed integrally with the eye.