JP2539045Y2 - Mounting structure of hydraulic valve in agricultural tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a structure for mounting a hydraulic valve in an agricultural tractor that performs work such as field work.

[Problems to be Solved by the Related Art and the Invention] Generally, in this kind of agricultural tractor, an actuator operation such as lifting and lowering of a work machine is performed by hydraulic pressure, and a hydraulic valve is mounted to switch the hydraulic oil. Can be

By the way, conventionally, the hydraulic valve is disposed on the side of the hydraulic case. However, the hydraulic valve is far from the hydraulic pump, so that the piping connecting the hydraulic pump and the hydraulic valve must be lengthened. There is a problem that the space for mounting the hydraulic valve is narrow due to other members, and the assembly and maintenance become extremely complicated and complicated.

[Means for Solving the Problems] The present invention has been made in view of the above-described circumstances, and has been created with the object of providing an installation structure of a hydraulic valve in an agricultural tractor capable of eliminating these disadvantages. In a farm tractor in which hydraulic valves for sending hydraulic oil to various actuators are juxtaposed with a transmission case, a clutch cover integrally attached to the transmission case is extended outward and the cover is provided. A case extension where the control case attached to the upper side of the hydraulic pump attached to the rear side of the extension, the inside of the fender, the outside of the transmission case, and the top surface of the transmission case is extended outward. The space enclosed by the lower surface of the case is protected by a hydraulic valve fixed to the case extension. It is characterized by a space.

According to the present invention, the hydraulic valve can be incorporated at a position close to the hydraulic pump and in a state where the hydraulic valve is securely protected.

Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, 1 is a traveling body 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 part of the transmission case 2. A clutch input shaft gear 7a rotatably supported by the main drive shaft 4 is always meshed with a drive input gear 3a formed integrally 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 an auxiliary transmission shaft disposed in parallel with the intermediate shaft 10, and a transmission mechanism such as a main transmission mechanism A, a forward / reverse switching mechanism B, an ultra-low speed switching mechanism C, an auxiliary transmission mechanism D, etc., is provided between these axes. Are formed, but details thereof are omitted.

On the other hand, reference numeral 12 denotes a hydraulic pump, which is located on one side of the transmission case 2 (the right side in the embodiment).
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 The hydraulic pump 12 and the hydraulic valve 18 connected to the hydraulic pump 12 via a pipe 17 have the following arrangement.

That is, the hydraulic pump 12 is integrally mounted on the rear surface of the extension of the clutch cover 2a, but the space for the hydraulic pump 12 is limited to the outside (left side in the embodiment) of the transmission case 2 and the body frame. The upper surface 1a, the inner surface of the fender 13, the rear surface of the clutch cover 2a, and the front surface of the rear axle housing 14 are formed in a space that is surrounded by a space except for the upper side. The pump 12 is configured to be protected by these surrounding members.

On the other hand, an arrangement space for the hydraulic valve 18 is secured in an upper dead space where the hydraulic pump 12 is mounted. That is, the left and right sides are surrounded by the fender 13 and the transmission case 2, and the lower side is surrounded by the hydraulic pump 12, and the upper side is surrounded by a case extension portion 19 a extending to the outside of the control case 19 provided on the upper surface of the transmission case 2. It is arranged in a space, and is configured to be integrally fixed to the lower surface of the case extension 19a.

In the drawing, reference numeral 15 denotes a filter, which is disposed below the step 1b and in a space surrounded on the left and right by the body frame 1a and the transmission case 2. And is integrally fixed to the upper surface of a mounting bracket 1c projecting from the body frame 1a. The filter 15 is connected to a suction pipe 16 extending from the transmission case 2 and a hydraulic pump 12. Each end of the suction pipe 16a is connected to and communicated with the suction pipe 16a.

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. The hydraulic oil sent by the operation of the hydraulic pump 12 is sent via a hydraulic valve 18 while being controlled to various hydraulic actuators such as a hydraulic cylinder housed in a hydraulic case 19.

By the way, the hydraulic pump 12 is arranged side by side on the transmission case 2 so as to keep away from the engine so that engine vibrations are not directly transmitted. By the transmission case 2 and the fender 13, the front and rear directions are accommodated and protected by the clutch cover 2 a and the rear axle housing 14, and the downward direction is accommodated and protected by the dead space surrounded by the body frame 1 a. For this reason, even if the body falls into a groove or the like by mistake, the hydraulic pump 12 is reliably protected by the member device surrounding the hydraulic pump 12 and is surely protected from being damaged. Become. In addition, this effective protection of the hydraulic pump 12 effectively reduces the number of parts without separately using a dedicated protection member because the members required for assembling the agricultural tractor are effectively used. In addition, parts can be shared.

In this way, a space for disposing the hydraulic valve 18 is further secured above the space for disposing the hydraulic pump 12 that is effectively protected. Therefore, the hydraulic valve 18 is located outside the transmission case and By effectively utilizing the dead space formed in the space above the hydraulic pump 12, it can be disposed in a state where the surroundings are protected. Moreover, the hydraulic valve 18 can be arranged close to the hydraulic pump 12, so that the piping 19 can be shortened as much as possible, which can contribute to cost reduction.

Also, the filter 15 has suction pipes 16 and 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 assemblage when assembling the machine at the factory.Therefore, there is no need to apply masking to individual parts before painting as in the past, and the painting and assembly process Is simplified.

[Operation and Effect] In short, since the present invention is constructed as described above, the transmission case, the hender, and the front direction are formed by the clutch cover, and the downward direction is formed by the body frame. The dead space secured above the storage space for the hydraulic pump can be secured as the storage space for the hydraulic valve.Therefore, there is no need to secure the mounting space for the hydraulic valve on the side of the hydraulic case as in the past, Even if the body accidentally falls into a groove or the like, the hydraulic pump and the hydraulic valve can be reliably protected by the member device surrounding the hydraulic pump and the hydraulic valve. In addition, the hydraulic valve can be disposed as close to the hydraulic pump as possible, so that the piping between the two can be shortened by that much, which can also contribute to cost reduction.

[Brief description of the drawings]

The drawings show an embodiment of the hydraulic valve mounting structure in the agricultural tractor according to the present invention, wherein FIG. 1 is an overall side view of the agricultural tractor, FIG. 2 is a developed sectional view of a transmission case, FIG. 3 is a side view of the hydraulic pump mounting portion, FIG. 4 is a rear view of the same, and FIG. 5 is a plan view of the same. In the figure, 1 is a traveling body, 1a is a body frame, 2 is a transmission case, 2a is a clutch cover, 12 is a hydraulic pump, 13 is a hender, 14 is a rear axle housing,
18 is a hydraulic valve, and 19 is a pipe.

Claims (1)

(57) [Scope of request for utility model registration] An agricultural tractor having hydraulic valves for sending hydraulic oil to various actuators arranged side by side in a transmission case, wherein a clutch cover integrally attached to the transmission case extends outward. The control case attached to the upper side of the hydraulic pump attached to the rear side of the extension of the cover, the inside of the ender, the outside of the transmission case, and the control case attached to the upper surface of the transmission case is extended outward. The space surrounded by the lower surface of the case extension
A hydraulic valve mounting structure for an agricultural tractor, wherein the hydraulic valve is secured and stored in the case extension portion.