JP5461658B2 - Hydraulic pump device for work equipment - Google Patents

Description

  The present invention relates to a hydraulic pump device for a working machine such as a tractor.

  In a hydraulic pump device of a work machine such as a tractor, a hydraulic pump is provided in a state where a pump input shaft rushes into a transmission case, and is engaged with a first bevel gear externally fitted to a PTO propulsion shaft and a first bevel gear. A second bevel gear connected to the pump input shaft of the pump is provided in the transmission case, and the rotational power of the PTO propulsion shaft is taken out via the first bevel gear and the second bevel gear to rotationally drive the pump input shaft of the hydraulic pump. There is something like that (for example, Patent Document 1).

  In the conventional hydraulic pump device of this type of work machine, the support cylinder shaft protruding from the first bevel gear and the support shaft protruding from the second bevel gear are supported by different holders so as to be rotatable around the axis. The holder that supports the first bevel gear is different from the holder that supports the second bevel gear (for example, Patent Document 1).

JP 2006-90476 A

In the conventional case, the bearing case for supporting the first bevel gear and the holder for supporting the second bevel gear are different, so that the first bevel gear and the second bevel gear are troublesome to engage and adjust the first bevel gear and the second bevel gear. The installation work in Mission Case 1 was troublesome.
In view of the above problems, the present invention can easily engage and adjust the first bevel gear and the second bevel gear, and can easily incorporate the first bevel gear and the second bevel gear into the transmission case. It is a thing.

The technical means of the present invention for solving this technical problem is that the transmission case has a front transmission case and a rear transmission case joined to the rear part of the previous transmission case , and a shaft for power transmission in the front transmission case . A first bevel gear driven by the first bevel gear, a second bevel gear meshed with the first bevel gear and connected to the pump input shaft of the hydraulic pump, and a holder for supporting the second bevel gear,
The holder that supports the second bevel gear has a support portion that supports the first bevel gear and a power transmission shaft, and the support portion is attached to and detached from the mounting boss via a fastener inside the rear portion of the front transmission case. It is in the point where it is installed.

According to another technical means of the present invention, the first bevel gear has a support cylinder shaft protruding in the axial direction, and the support cylinder shaft is fitted on the rear end portion of the power transmission shaft and the holder Supported by the first support,
The second bevel gear has a support shaft protruding in the axial direction, the support shaft is connected to the pump input shaft so as to rotate about the same axis, and is supported by the second support portion of the holder,
The first support portion and the second support portion of the holder are arranged in an L shape, and the peripheral portion of the first support portion is attached to the mounting boss inside the rear portion of the front transmission case .

  Another technical means of the present invention is that the transmission case has a front transmission case and a rear transmission case, and the holder is mounted inside a rear end of the front transmission case.

  According to the present invention, the holder for supporting the power transmission shaft is detachably attached to the transmission case, and the first bevel gear and the second bevel gear are supported by the holder so as to be rotatable about the axis. The first bevel gear and the second bevel gear can be meshed and adjusted easily. In addition, the first bevel gear and the second bevel gear can be easily assembled into the transmission case.

Further, the support cylindrical shaft of the first bevel gear is fitted on the rear end portion of the power transmission shaft and supported by the first support portion of the holder, and the support shaft of the second bevel gear is rotated around the same axis as the pump input shaft. And the first support part and the second support part of the holder are arranged in an L-shape, so that the first bevel gear and the second bevel gear are The holder can be easily and inexpensively manufactured.

  Furthermore, since the holder is mounted inside the rear end of the front mission case, assembly and disassembly can be easily performed.

It is side surface sectional drawing which has a back surface sectional view in a part of working machine which shows one Embodiment of this invention. It is sectional drawing to which the pump mounting part of FIG. 1 was expanded. It is a back sectional view of the pump installation part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, the tractor vehicle body includes a transmission case 1. The transmission case 1 includes a front transmission case 3 that incorporates a gear-type main transmission 2, and a rear rear that incorporates a rear wheel differential and a PTO transmission. Mainly composed of a mission case 4. The rear edge 3a of the front mission case 3 and the front edge 4a of the rear mission case 4 are joined back and forth.

A clutch housing 8 is connected to the front side of the front mission case 3, and the housing 8 is connected to the rear surface of the engine.
The power of the engine is connected and disconnected by a clutch and transmitted to the traveling system propulsion shaft 11, and the propulsion shaft 11 is divided into a front shaft 11A and a rear shaft 11B with a cylindrical shaft structure. The shaft 12 is inserted and linked to the PTO transmission unit via the PTO clutch 13.

The traveling system propulsion shaft 11 is mounted on the front transmission case 3 by a bearing 14 or the like on the support holder 9 and the intermediate wall 10, and in parallel with the shaft 11, the transmission countershaft 15 is a bearing and is supported by the support holder 9 and the intermediate wall 10. It is built in.
The gear-type main transmission unit 2 is always fitted in the embodiment, and is provided across the propulsion shaft 11 and the transmission countershaft 15.

That is, a first shifter 18 that can be freely engaged with and disengaged between the drive first and second transmission gears 16 and 17 that are supported so as to be idled on a substantially axial center portion of the transmission subshaft 15, and The main transmission unit 2 includes a transmission gear 19 and a driving third transmission gear 20 on the front side of the shaft 15, and a reverse gear 21 provided on the rear side of the transmission subshaft 15 so as to freely rotate.
The front shaft 11A of the traveling system propulsion shaft 11 is provided with a drive gear 22 that is fitted to the transmission gear 19 on the auxiliary shaft 15, and this gear 22 and the rear shaft 11B are directly connected by an arrow 4F to a fourth speed. The second shifter 23 is configured such that the driven third speed change gear 24 fitted to the drive third speed change gear 20 can be engaged and disengaged to obtain the third speed at an arrow 3F. .

Further, driven first and second transmission gears 25 and 26 that are fitted to the drive first and second transmission gears 16 and 17 are fixed to the rear shaft 11B of the propulsion shaft 11 and are also fitted to the reverse gear 21. The first and second speeds can be obtained by providing the wide transmission gear 27 and shifting the first shifter 18 to the arrows 1F and 2F.
A transmission output shaft 28 is installed in the front transmission case 3 with a bearing 29 so as to be parallel to the traveling system propulsion shaft 11 and the transmission subshaft 15. A low speed gear 32 and a reverse gear 34 are provided, and are linked to the rear wheel differential via a transmission shaft 31.

The rear wheel differential is linked to the rear wheel via a final reduction gear, and the front wheel differential is linked to the front wheel via a final reduction gear to form a four-wheel drive tractor.
The PTO propulsion shaft 12 transmits engine power to the PTO transmission shaft 33 via the PTO clutch 13, and the PTO transmission shaft 33 transmits power to the PTO shaft at the rear of the rear transmission case 4 via the PTO transmission mechanism. It is configured.

The PTO propulsion shaft 12 and the PTO transmission shaft 33 are disposed opposite to each other on the same axis in the rear portion of the front mission case 3 or the front portion of the rear mission case 4, and both are located in front of the rear mission case 3 or the rear mission case 4. It is supported in the part so as to be rotatable independently of each other via a bearing.
Next, a description will be given of a pump power take-off structure attached to the transmission case 1 as a hydraulic pressure supply means for a power steering hydraulic supply means for the tractor and a three-point link hitch mechanism driving hydraulic pressure supply means installed at the rear of the tractor.

As shown in FIGS. 2 and 3, a hydraulic pump 35 is detachably attached to the right side surface of the rear portion of the front mission case 3 with a fastener 37 such as a bolt, and the hydraulic pump 35 is outwardly moved from the rear portion of the front mission case 3. The pump input shaft 36 of the hydraulic pump 35 protrudes into the rear portion of the front mission case 3.
A holder 38 that supports the rear end portion of the PTO propulsion shaft 12 is provided in the rear portion of the front mission case 3, and the holder 38 is attached to and detached from a mounting boss of the rear edge portion 3a of the front mission case 3 by a fastener 39 such as a bolt. The front transmission case 3 is mounted inside the rear end of the front mission case 3.

  A first bevel gear 41 externally fitted to the rear end portion of the PTO propulsion shaft 12 and a second bevel gear 42 connected to the pump input shaft 36 of the hydraulic pump 35 are provided in the rear portion of the front mission case 3, and the second bevel gear is provided. 42 is meshed with the first bevel gear 41. The first bevel gear 41 is disposed behind the second bevel gear 42, the first bevel gear 41 has a support cylinder shaft 43 protruding in the axial direction, and the support cylinder shaft 43 is splined at the rear end of the PTO propulsion shaft 12. It is mated. The second bevel gear 42 has a support shaft 46 protruding in the axial direction. The support shaft 46 of the second bevel gear 42 and the pump input shaft 36 are connected and fixed by a coupling 47, whereby the support shaft 46 is connected to the pump input shaft 36 so as to rotate about the same axis.

  The holder 38 has a first support portion 51 and a second support portion 52 in an L shape, the first support portion 51 is provided with a first attachment hole 53, and the second support portion 52 has a second attachment hole 54. Is provided. The rear end portion of the PTO propulsion shaft 12 and the support cylinder shaft 43 of the first bevel gear 41 are inserted in the front-rear direction into the first mounting hole 53 of the first support portion 51, and are rotatable to the holder 38 via the bearing 44. It is supported. As a result, the first bevel gear 41 and the rear end portion of the PTO propulsion shaft 12 are supported by the holder 38 so as to be rotatable about the axis, and the rear end portion of the PTO propulsion shaft 12 is transmitted via the first bevel gear 41 and the holder 38. It is supported by the case 1. A support shaft 46 of the second bevel gear 42 is inserted in the second mounting hole 54 of the second support portion 52 in the left-right direction, and is rotatably supported by the holder 38 via a bearing 45.

  According to the above embodiment, after the PTO propulsion shaft 12, the transmission output shaft 28, the countershaft 15, each transmission gear, and the like on the front side of the intermediate wall 10 of the front mission case 3 are incorporated in the front mission case 3, The bevel gear 41 and the second bevel gear 42 are respectively assembled in the holder 38 so as to be rotatable around the axis, and in this state, the holder 38 is inserted into the front mission case 3 from the upper side or the side of the front mission case 3 to Is attached to the rear edge 3a of the front transmission case 3 with a fastener 39 such as the like, and is then fitted into the support cylinder shaft 43 of the first bevel gear 41 to attach the support cylinder shaft 43 of the first bevel gear 41 to the PTO propulsion shaft 12. Fit the spline. Further, the pump input shaft 36 of the hydraulic pump 35 is inserted into the front mission case 3 and the support shaft 46 of the second bevel gear 42 and the pump input shaft 36 are connected and fixed by the coupling 47, while a bolt or the like is applied from the outer surface. The hydraulic pump 35 may be fastened and fixed to the front mission case 3 with the fastener 37.

  Accordingly, since the first bevel gear 41 and the second bevel gear 42 are supported by the single holder 38 so as to be rotatable around the shaft center, they can be assembled before being assembled into the transmission case 1, and the meshing of the bevel gear, Adjustments can be made easily.

DESCRIPTION OF SYMBOLS 1 Mission case 3 Front mission case 3a Rear edge part 4 Rear mission case 12 PTO propulsion shaft 35 Hydraulic pump 36 Pump input shaft 41 1st bevel gear 43 Support cylinder shaft 44 Bearing 45 Bearing 46 Support shaft

Claims (2)

The mission case (1) has a front mission case (3) and a rear mission case (4) joined to the rear part of the previous mission case (3) , and a shaft for power transmission in the front mission case (3) . A first bevel gear (41) driven by (12) and a second bevel gear (42) meshed with the first bevel gear (41) and connected to the pump input shaft (36) of the hydraulic pump (35). And a holder (38) for supporting the second bevel gear (42),
The holder (38) for supporting the second bevel gear (42) has a support portion (51) for supporting the first bevel gear (41) and the power transmission shaft (12), and this support portion (51). Is a hydraulic pump device for a working machine, wherein the hydraulic pump device is detachably attached to a mounting boss via a fastener (39) inside the rear part of the front mission case (3) . The first bevel gear (41) has a support cylinder shaft (43) protruding in the axial direction. The support cylinder shaft (43) is fitted on the rear end of the power transmission shaft (12) and a holder ( 38) is supported by the first support part (51),
The second bevel gear (42) has a support shaft (46) protruding in the axial direction, the support shaft (46) is connected to the pump input shaft (36) so as to rotate about the same axis and the holder It is supported by the second support part (52) of (38),
The first support part (51) and the second support part (52) of the holder (38) are arranged in an L shape, and the periphery of the first support part (51) is the rear part of the front transmission case (3). The hydraulic pump device for a working machine according to claim 1, wherein the hydraulic pump device is attached to the inner mounting boss .

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