JPS5839935Y2 - Hydraulic pump devices for agricultural tractors, etc. - Google Patents

Description

[Detailed description of the invention] This invention is based on a mobile working vehicle such as an agricultural tractor, a riding rice transplanter, or a combine harvester (hereinafter referred to as "agricultural tractor, etc.").

), more specifically, a hydraulic pump is mounted on a wall provided in the body housing of an agricultural tractor, etc., with the pump housing abutting against the front of the wall, and the pump of this hydraulic pump is The present invention relates to a hydraulic pump device configured to transmit power from a shaft to a subsequent transmission member.

As mentioned above, hydraulic pump devices in which the hydraulic pump or its pump shaft is inserted into the power transmission path are already often used in agricultural tractors, etc. In order to make it easier to install the pump shaft upwardly, and to make the pump shaft short so that the pump shaft supported by the pump housing via a pair of bearings can be stably supported, Rather than directly transmitting output to the following transmission member, another transmission shaft was connected to the rear end of the pump shaft by a compression ring, and the output was transmitted from the transmission shaft to the following transmission member. .

Therefore, the conventional type requires the above-mentioned transmission shaft, compulsion ring, and bearing for supporting the transmission shaft.

The purpose of this invention is to eliminate the above-mentioned transmission shaft, compression ring, and transmission shaft bearing in the conventional product, reduce the number of parts, and simplify assembly. Similarly, it is an object of the present invention to provide a novel hydraulic pump device for use in agricultural tractors, etc., which is easy to mount on a wall surface and is designed to stably support a pump shaft.

Regarding the illustrated embodiment, the configuration of a hydraulic pump device for an agricultural tractor or the like according to this invention will be explained. As shown in FIG. The power is transmitted to the rear of the fuselage through the inside of the blowfish 2, the mission case 3, etc., and drives the left and right rear wheels 4, which are running drive wheels, and a working machine (not shown) connected to the rear of the fuselage by a coupling device 5. This invention is applicable to an agricultural tractor configured so that the operator sitting on the passenger seat 6 turns the left and right front wheels 8 using the steering bundle 7 to steer the machine. , is implemented as follows.

That is, this agricultural tractor has a hydraulic clutch type transmission device 9 which constitutes a traveling power main transmission device, a part of which is shown in FIG. A device 9 is provided, and the lower part of the transmission case 3 is also used as an oil tank, and hydraulic oil is sucked from the lower part of the case 3 through an oil supply pipe 10 and the like to maintain the oil pressure in the hydraulic flange type transmission 9. A hydraulic pump 11 for supplying oil to the flange is installed on the front wall 12 of the transmission case 3 and arranged inside the clutch housing 2.According to this invention, the hydraulic pump 11 is It is set up as follows.

That is, as similarly shown in FIG. 2, the hydraulic pump 11 includes a drive gear 15 that is fitted onto a pump shaft 14, and a drive gear 15 that is fitted onto a pump shaft 14, inside a pump housing 13 whose front surface is covered with a housing lid 13a. The internal gear pump is configured with an internal gear 16 that is eccentrically positioned and meshes with the drive gear 15 only in a part of the circumference, and is interlocked with the engine 1 through a main clutch. A pump shaft 14 is connected to a connected drive shaft (not shown) by a compring ring 17, so that the pump shaft 140 is rotationally driven, and the power of the engine 1 is transmitted through the pump shaft 14. mission case 3
The pump housing 13 of the hydraulic pump 11 is provided with a cylindrical extending portion 18 extending toward the front wall 12 of the transmission case at the outer periphery of the pump shaft 14. be.

A fitting hole 19 is formed in the mission case front wall 12 to fit and support the cylindrical extending portion 18. The cylindrical extending portion 18 is fitted into the fitting hole 19 and Lid 1
3a and the pump housing 13 at the same time with multiple screw punches 2.
0 to the front wall 12, that is, the screw punch 20 serves as a fixing means for fixing the housing cover 13a to the pump housing 13 and a fixing means for fixing the pump housing 13 to the front wall 12. The pump 14 is attached to the front wall 12 of the mission case in order to save parts and reduce the number of fixing steps.

The pump shaft 14 is formed as a long shaft extending into the mission case 3, and the pump shaft 14 is inserted into the fitting hole 19 formed by penetrating the front wall 12 as shown in the figure. , and extends into the mission case 3.

The rear end portion of the pump shaft 14 located inside the mission case 3 has a large diameter portion 14a as shown in the figure, and a spline 22 for fitting the transmission gear 21 is formed on the circumferential surface of the large diameter portion 14a. , the pump shaft 14 is attached to the large diameter portion 14a.
The transmission shaft 2 is disposed concentrically within the mission case 3.
A support hole 24 with an open rear end is formed to support the front end of the pump shaft 14, and a mating pawl 26 formed on the shift gear 25 on the transmission shaft 23 is provided on the rear end surface of the pump shaft 14 to prevent displacement of the shift gear 25. A mating pawl 27 is provided which is selectively engaged with the pump shaft 1 by the meshing between the mating pawls 26 and 27.
4 and the transmission shaft 23, the pump shaft 14 is supported near its front end by a ball bearing 28 held by the housing lid 13a.
The following ball bearing 29 is installed near the rear end.
Supported by

That is, the cylindrical extension portion 18 of the pump housing 13
A bearing holding part 30 is formed by hollowing out the inner circumferential surface of the cylindrical extension part 18 in an annular manner at the extending end of the ball bearing 29, and the end face of the inner ring 29a is connected to the pump shaft large diameter part 14a. While hitting the stepped portion 31 at the front end, the outer
The end surface of the ring 29b is placed against the step 32 at the front end of the holding part 30, and is fitted and held in the bearing holding part 29, so that the bearing 29 held in this way supports the vicinity of the rear end of the pump shaft 14.

Note that 33 shown in FIGS. 2 and 3 indicates the pump housing 13.
The hydraulic oil discharged from the hydraulic pump 11 is supplied to the pulp housing 34 on the upper surface of the transmission case 3, which houses a switching valve (not shown), etc. 34 and then into a seal housing 36 that fits over the end of the power shift shaft 35 in the hydraulic clutch type transmission 9.
The front wall 12 of the transmission case is designed to be guided from the inside to the hydraulic clutch on the power shift shaft 35 via an oil passage (not shown) in the power shift shaft 35. It also serves as an oil passage forming plate that forms an oil passage between the valve housing 34 and the seal housing 36.

As is clear from the above explanation, the hydraulic pump device for agricultural tractors, etc. of this invention is such that the hydraulic pump is mounted on a wall provided in the body housing of the agricultural tractor, etc., and the pump housing is abutted against the front surface of the wall. A hydraulic pump device for an agricultural tractor or the like, which is configured to be mounted on a hydraulic pump and transmit power from the pump shaft of the hydraulic pump to a subsequent transmission member, the rear end of the pump shaft 14 being The wall 12 is inserted through the hole 19 formed in the wall 12.
A transmission member 21.27 is provided at the extending end 14a to transmit an output to a transmission member following the pump housing 1.
3 is formed with a cylindrical extending portion 18 extending in the direction of the wall 12 at the outer circumference of the pump shaft 14, and this cylindrical extending portion 18
a holding part 30 which is fitted and supported in the hole 19 of the wall body 12 described above, and further holds a bearing 29 which supports the rear end side of the pump shaft 14 in the extending end of the cylindrical extension part 18;
The bearing 29 is disposed in the hole 19 of the wall 12, and has the following advantages.

That is, the hydraulic pump device of this invention has a hydraulic pump 11.
The pump shaft 14 is connected to the fuselage housing 3 behind the wall 12.
A power transmission member 21,27 is provided at the extending end 14a of such a pump shaft 14 to transmit power directly from the pump shaft 14 to a subsequent transmission member. Therefore, the transmission shaft that was conventionally provided for such output transmission, the camp ring for connecting the transmission shaft to the rear end of the pump shaft, and the bearing for supporting the transmission shaft. By eliminating this, the number of parts can be reduced and assembly can be facilitated.

However, in the hydraulic pump device of this invention, when installing the hydraulic pump 11 on the wall 12,
When passing the pump shaft 14 through the hole 19, the cylindrical extension 18 of the pump housing 13 is fitted into the hole 19, and the pump housing 18 is positioned. It is easy to install, and even though the pump shaft 14 is long, the bearing 29 that supports the rear end of the pump shaft 14 is installed in the hole 19 of the wall 12, that is, as long as possible for the long pump shaft 14. The pump shaft 14 is supported at the rear position, and the cylindrical extension part of the pump housing 13 is fitted into the hole 19 and stably supported by a holding part 30 for the bearing 29. Since the bearing 29 is formed at the end of the pump shaft 18 so that the bearing 29 can be stably supported, the pump shaft 14 can be stably supported.

[Brief explanation of the drawing]

Fig. 1 is a side view of an agricultural tractor equipped with an embodiment of this invention, Fig. 2 is a partially omitted longitudinal side view of the main parts of the agricultural tractor, and Fig. 3 is a view taken along the ■-■ arrows in Fig. 2. It is. 3...Mission case, 11...Hydraulic pump, 12...Mission case front wall, 1
3...Pump housing, 13a...
Housing lid, 14...Pump shaft, 18...
... Cylindrical extension part, 19 ... Fitting hole, 29 ...
...Bearing, 30...Bearing holding part.

Claims (1)

[Scope of utility model registration request] A hydraulic pump is mounted on a wall installed in the body housing of an agricultural tractor, etc., with the pump nozzle abutting against the front of the wall, and power is transmitted from the pump shaft of this hydraulic pump to the subsequent transmission member. A hydraulic pump device for an agricultural tractor or the like, which is configured to transmit power to the vehicle body behind the wall 12 by passing the rear end of the pump shaft 14 through a hole 19 formed in the wall 12. A transmission member 21, 27 is provided which extends into the inside of the transmission member 3 and transmits output to the transmission member following the extending end 14a, and
A cylindrical extending portion 18 extending in the direction of the wall 12 is formed on the pump housing 13 at the outer periphery of the pump shaft 14, and the cylindrical extending portion 18 is inserted into the hole 19 of the wall 12 described above. A holding part 30 is provided to fit and support the bearing 29 that supports the rear end side of the pump shaft 14 at the extending end of the cylindrical extension part 18.
The hydraulic pump device is characterized in that the above-mentioned is arranged in the hole 19 of the wall body 12.