JPH083216Y2 - Hydraulic pump protection structure for agricultural tractors - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a protection structure for a hydraulic pump in an agricultural tractor that performs work such as field work.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of agricultural tractor, actuator operations such as lifting and lowering of working machines are performed hydraulically, and therefore a hydraulic pump is attached. By the way, these hydraulic pumps are driven by the driving force of the engine, and therefore many of them are directly connected to the engine, but the problem is that the engine operates at high temperature and vibrates violently, which hinders smooth operation of the hydraulic pump. There is. Therefore, it is proposed that the hydraulic pumps be installed side by side in the transmission case so that the driving force can be obtained from the transmission case, but not only is it difficult to secure a mounting space for the hydraulic pump, but it also protects the hydraulic pump. There is a need, and new measures for this are required.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and was devised with the object of providing a protective structure for a hydraulic pump in an agricultural tractor capable of eliminating the following points. In an agricultural tractor in which a hydraulic pump for sending hydraulic oil to various actuators is juxtaposed in a transmission case, a clutch cover integrally attached to the transmission case is extended toward the outside, A hydraulic pressure is secured to the extension by the rear side of the extension, the outer side of the transmission case, the inside of the fan, the upper side of the fuselage frame, and the front side of the rear axle housing. It is characterized by being used as a protective storage space for the pump.

According to the present invention, with this configuration, when the hydraulic pump is attached to the transmission case, the hydraulic pump can be reliably protected.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, 1 is a traveling vehicle of an agricultural tractor,
The traveling body 1 is equipped with a transmission case 2. An input shaft 3 for inputting power from an engine, a main drive shaft 4, and a hydraulic One end of each shaft such as the pump drive shaft 5 and the front wheel drive shaft 6 is rotatably supported. A main clutch 7 is mounted on the main drive shaft 4 so as to be housed in a clutch cover 2a integrally attached to cover the front portion of the transmission case 2. The clutch input shaft gear 7a rotatably supported by the main drive shaft 4 is always meshed with the drive input gear 3a integrally formed with the input shaft 3. The power from the input shaft 3 is configured to be intermittently transmitted to the main drive shaft via the main clutch 7. Further, the hydraulic pump drive shaft 5 is configured such that the front bearing supporting portion of the transmission case 2 and the clutch cover 2a are connected to the transmission case 2.
Is rotatably mounted on an extending portion extending outwardly from the right side surface of the arm. The hydraulic pump drive shaft 5 has a transmission gear 5a integrally provided with the shaft 5 and the clutch input shaft gear 7a.
And the power is transmitted to the hydraulic pump drive shaft 5 irrespective of whether the main clutch 7 is intermittent or not.

In the drawing, 8 is a power take-off shaft (PTO shaft), 9 is a main transmission shaft, 10 is an intermediate shaft arranged concentrically with the main transmission shaft 9,
Reference numeral 11 denotes a sub-transmission shaft arranged in parallel with the intermediate shaft 10. Between these shafts, a main transmission mechanism A, a forward / reverse switching mechanism B, an ultra-low speed switching mechanism C, a sub-transmission mechanism D, etc. Is modified, but its details are omitted.

On the other hand, 12 is a hydraulic pump, and the hydraulic pump 12 is on one side of the transmission case 2 (right side surface in the embodiment).
Are arranged in parallel so as to face each other, and the pump shaft 12a of the hydraulic pump 12 is integrally fitted and supported by the transmission gear 5a of the hydraulic pump drive shaft 5 so that the power of the input shaft 3 is directly transmitted. However, the hydraulic pump 12 has the following arrangement configuration.

That is, the hydraulic pump 12 is integrally attached to the rear surface of the extending portion of the clutch cover 2a, and the disposing space is the outer surface (left side in the embodiment) of the transmission case 2 and the machine body frame 1a. Upper side of the fender
An inner side surface of the clutch cover 2a, a rear side surface of the clutch cover 2a, and a front side surface of the rear axle housing 14 are formed in a space surrounded by the periphery except for the upper side. It is configured to be protected by a member that operates.

On the other hand, 15 is a filter, and the filter 15 is a step
It is located below 1b and in a space surrounded by the body frame 1a and the transmission case 2 on the left and right, and is integrally formed on the upper surface of the mounting bracket 1c protruding from the body frame 1a. Although it will be fixed, the filter 15 has a supporting structure in which the ends of a suction pipe 16 extending from the transmission case 2 and a suction pipe 16a reaching the hydraulic pump 12 are connected to each other. ing.

In the embodiment of the present invention configured as described above, the driving force from the engine is input to the input shaft 3 supported by the transmission case 2 and transmitted to the case via the main clutch 7. But the input power is
Clutch input shaft gear provided on the clutch shaft of main clutch 7
The hydraulic pump 12 is input to the hydraulic pump drive shaft 5 through 7a.
Will be activated. Therefore, the hydraulic pump 12 is irrelevant to the intermittent operation of the main clutch 7 and the speed change operation of various speed change mechanisms.
The operation is directly connected to the engine drive.

As described above, the hydraulic pump 12 is arranged side by side on the transmission case 2 side so as to prevent the engine vibration from being transmitted directly away from the engine. Is protected by the transmission case 2 and the fan 13, the front and rear direction by the clutch cover 2a and the rear axle housing 14, and the downward direction by the fuselage frame 1a. Therefore, even if the machine body accidentally falls into a groove or the like, the hydraulic pump 12 can be surely protected by the member device surrounding it.
It will certainly protect you from damage. Moreover, since this effective protection of the hydraulic pump 12 effectively utilizes the members necessary for assembling the agricultural tractor, it is possible to reduce the number of parts without the need for a dedicated protective member. Therefore, dual use of parts can be achieved.

In addition, the filter 15 has a suction pipe 16, 16
The transmission case 2 can be supplied as an assembly in which the hydraulic pump 12 and the filter 15 are integrally mounted, since the transmission case 2 is supported by the a.
As a result, it can be handled as a transmission case assembly when it is installed in the factory, and it is not necessary to apply masking to individual parts before painting as in the past. Is simplified.

Of course, the present invention is not limited to the cartridge type externally attached to the filter 15 as in the above-mentioned embodiment, and it is not limited to that shown in FIG.
As in the second embodiment shown in FIG. 8, it can also be implemented as an internal mounting type that is mounted in the transmission case 2, but in that case, the packing 17 is sandwiched between the clutch cover 2a and the hydraulic pump 12. , And the return oil port T ₁ to the transmission case 2 on the packing 17
If the T ₂ Oke by drilled hole 17a in lower position not facing directly, when the return oil returns to the trans honey Chillon case 2 via the return fluid port T _1, T _2, Patsukin 17 and hydraulic It will pass through between the surfaces facing the pump 12, and as a result, the bubbles contained in the return oil will be crushed and there will be no bubbling, and there will be no problem that the return oil will be directly blown to the transmission case 2. good.

Further, the filter 15 can be passed through a pipe. That is, as shown in FIG. 9, an expandable and contractible bellows-like joint 19 can be detachably attached in the middle of the pipe 18, and the filter 15 can be incorporated therein, which facilitates cleaning of the filter 15. On the other hand, it is convenient that there is no need to replace the filter 15 with a new one at the time of maintenance, and even if there is no hand, it can be used as it is.

[Advantages] In short, since the present invention is configured as described above, the hydraulic pump is installed in parallel with the transmission case to keep it away from the engine so that engine vibration is not directly transmitted. In that case, however, the hydraulic pump was surrounded by the transmission case and the fan in the left-right direction, by the clutch cover and the rear axle housing in the front-rear direction, and by the body frame in the downward direction. It is housed and protected in the dead space. Therefore, even if the machine body accidentally falls into a groove or the like, the hydraulic pump can be reliably protected by the member device surrounding the machine body. Moreover, this effective protection of the hydraulic pump makes effective use of the members necessary for assembling the agricultural tractor, so the number of parts can be reduced without the need for a dedicated protective member. The dual use of parts can be achieved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a protective structure for a hydraulic pump in an agricultural tractor according to the present invention. FIG. 1 is an overall side view of the agricultural tractor, FIG. 2 is a developed sectional view of a transmission case, 3 is a side view of a hydraulic pump mounting portion, FIG. 4 is a rear view of the same as above, FIG. 5 is a plan view of the same as above, and FIG. 6 is a partially cutaway side view of a hydraulic pump mounting portion showing a second embodiment, FIG. 7 is a sectional side view of an essential part of the same, FIG. 8 is a front view of a packing, and FIG. 9 is a sectional view of a filter portion of a third embodiment. In the drawing, 1 is a traveling machine body, 1a is a machine body frame, 2 is a transmission case, 2a is a clutch cover, 12 is a hydraulic pump, 13 is a fan, and 14 is a rear axle housing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-304905 (JP, A) JP-A-58-128926 (JP, A) Actual Kaihei 1-180322 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An agricultural tractor in which a hydraulic pump for sending hydraulic oil to various actuators is installed in parallel with a transmission case, and a clutch cover integrally attached to the transmission case is extended outward. Installed, the rear side of the extended portion, the outer side of the transmission case, the inside of the fan, the upper side of the fuselage frame,
A structure for protecting a hydraulic pump in an agricultural tractor, wherein a space surrounded by a front side surface of the rear axle housing is a protective storage space for the hydraulic pump fixed to the extending portion.