JPH11351383A - Arrangement structure of hydraulic oil tank to be used for hydrostatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the pipeline structure for connecting a hydraulic pump and a hydraulic oil tank to each other by installing a working transmission and the hydraulic pump under a driver's seat, and placing the hydraulic oil tank for fixation in any one side of right and left in the machine body traveling of the hydraulic pump. SOLUTION: A working transmission 12 is arranged inside a frame 3 positioned under a driver's seat, and a traveling hydraulic pump 15 is installed in a top surface of the working transmission 12, and output pipes 16, 17 are connected to the hydraulic motor. A hydraulic oil tank 11a of the traveling hydraulic pump 15 and a fuel tank 16 for engine are arranged in right and left sides in the machine body traveling direction. Input pipes 18, 19 of the hydraulic oil tank 11a are connected to the traveling hydraulic pump 15 through an oil filter 20. With this structure, since the pipeline structure of the traveling hydraulic pump 15 around a transmission shaft is eliminated, the consideration that each part is assembled while avoiding the arrangement position of a transmitting shaft becomes unnecessary, and the pipeline structure for connecting the traveling hydraulic pump 15 and the hydraulic oil tank 11a can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrostatic transmission (HST) mounted on a mobile agricultural machine such as a combine or a crawler tractor, and more particularly to a limited portion around a driving operation unit provided on a body. Hydrostatic transmission device that can effectively utilize the installation space that has been used, and can compactly arrange the hydraulic oil tank that supplies pressurized oil to the traveling hydraulic pump that forms the device with a piping configuration that is as short as possible. The present invention relates to an arrangement structure of a hydraulic oil tank used in the present invention.

[0002]

2. Description of the Related Art Conventionally, in a mobile agricultural machine such as a combine or a crawler tractor, a pair of left and right hydrostatic transmissions (hereinafter, referred to as HST devices) are independently driven as a traveling drive source, and the left and right crawler devices are shifted and driven. And it is known that the aircraft is configured to rotate by the steering operation of the operator of the driving operation unit, and as an actual traveling drive configuration,
JP-A-9-229002 and JP-A-9-30831
As disclosed in Japanese Unexamined Patent Publication No. 0, an HST drive device is provided with a traveling hydraulic pump at a rear position of a body frame in front of a transmission and transmits an output shaft of an engine mounted on a front portion of the body frame. The right and left hydraulic motors, which are directly connected to the traveling hydraulic pumps via shafts and are supported by the drive wheels of the respective crawler devices, are separately driven to rotate.

[0003] However, in the above-described drive configuration in which the engine and the traveling hydraulic pump are connected in series, the vibration of the running engine is transmitted to the traveling hydraulic pump as it is. In addition to the need for reinforcement, the transmission shaft connected to the output shaft of the engine and the hydraulic pump for traveling are located below the step surface of the operation operation unit arranged from the center of the fuselage frame to the rear. Therefore, the piping configuration of the traveling hydraulic pump must be performed avoiding the disposition position of the transmission shaft, and the disposition height of the step surface is also limited by the disposition of the respective members. , Leaving room for improvement.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in the course of research and development of a mobile agricultural machine employing an HST device in a traveling drive system in view of the above situation, and an object thereof. However, by equipping the traveling hydraulic pump constituting the HST device on the upper surface of the work implement transmission, it is possible to effectively use the limited space of the operation unit and to dispose it compactly. The connection piping configuration with the hydraulic oil tank that supplies pressure oil to the traveling hydraulic pump can be made as short as possible, so that the step surface located on the lower surface of the operation unit can be lowered and the HST can be reduced.
It is an object of the present invention to provide an arrangement structure of a hydraulic oil tank used in a hydrostatic transmission that is compatible with high-density installation of peripheral components related to the device.

[0005]

Means for Solving the Problems In order to solve the problems, a technical means adopted by the present invention is to input a rotational power of an engine provided at a front portion of an airframe to a hydraulic pump for traveling and to operate the hydraulic motor in conjunction therewith. In the hydrostatic transmission of a mobile agricultural machine configured to drive the traveling system with the shift output of the working machine, a transmission for a working machine is disposed at a lower position in a driving operation unit provided on the body, and the upper surface of the A hydraulic pump is provided, and a hydraulic oil tank of the hydraulic pump is mounted and fixed on one of the left and right sides of the hydraulic pump in the machine traveling direction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail based on an embodiment shown in the drawings. In the drawing, reference numeral 1 denotes a crawler tractor provided with a pair of left and right crawler traveling devices (not shown) at a lower portion of a frame 3 forming a body 2;
The crawler tractor 1 has an engine 5 mounted in a bonnet 4 provided at a front portion of the frame 3.
A driving operation unit 1 having a driver's seat 7, a driving handle 8, a console 9 and the like in a cabin 6 arranged substantially in the center of the vehicle.
0, and a hydraulic oil tank 11a of a traveling hydraulic pump 15 and a fuel tank 1
1b are provided to form a crawler tractor 1.

The frame 3 located below the driver's seat 7
A transmission 12 for a working machine is disposed in the inside, and a transmission shaft 13 for interlocking the transmission 12 for the working machine and the engine 5 is provided below a step surface 14 stretched on the operation section 10. And the driving force from the working machine transmission 12 is
′ To a working machine (not shown) mounted on the rear part of the machine body 1.

The transmission 12 for the working machine
A traveling hydraulic pump 15 is provided facing a case upper surface 12c on the other side (the same right side) formed lower than a case upper surface 12b on one side (the left side in the body traveling direction) of the case main body 12a. The output pipes 16 and 17 are jointed parts 16a,
The input pipes 18 and 19 of the hydraulic oil tank 11a located on one side of the traveling hydraulic pump 15 are connected to a hydraulic motor (not shown) that rotationally drives the pair of crawler traveling devices via the 17a. It is connected to the traveling hydraulic pump 15 via a filter 20. Reference numeral 21 denotes a switching lever of the transmission 12 for the working machine.

Accordingly, by providing the traveling hydraulic pump 15 which forms the HST device on the upper surface of the work machine transmission 12 as described above, the transmission shaft 13 can be provided under the step surface 14 of the operation section 10 as in the prior art. In addition, it is not necessary to consider the necessity of assembling each part including a complicated piping configuration around the disposition position of
Since only the transmission shaft 13 is provided below the step surface 14, the height of the step surface 14 can be set low, and the burden on the operator when getting on and off can be reduced.

Further, since the hydraulic oil tank 11a of the hydraulic pump 15 is arranged at one side of the traveling hydraulic pump 15 in the body, the piping structure including the input pipes 18, 19 and the oil filter 20 is provided. Can be connected in the shortest distance without performing complicated surroundings while avoiding the arrangement positions of other components, and a compact arrangement structure can be made by effectively using the limited space. .

[0011]

In summary, according to the present invention, the rotational power of the engine provided at the front of the fuselage is inputted to the traveling hydraulic pump,
In a hydrostatic transmission of a mobile agricultural machine configured to drive a traveling system with a shift output of a hydraulic motor interlocked with the transmission, a transmission for a working machine is disposed at a lower position in a driving operation unit provided on the body. The hydraulic pump is mounted on the upper surface, and the hydraulic oil tank of the hydraulic pump is mounted and fixed on one of the left and right sides in the machine traveling direction of the hydraulic pump. Since there is no piping configuration for the hydraulic pump, there is no need to consider the need to assemble each part while avoiding the installation position of the transmission shaft as in the past, and only the transmission shaft is installed under the step surface of the operation unit As a result, the step surface can be set low, the burden on the operator when getting on and off can be reduced, and the piping configuration for connecting the traveling hydraulic pump and the hydraulic oil tank is made as short as possible. This makes it possible to make effective use of the limited space to easily achieve a balance with other peripheral mechanisms in the driving operation unit, thereby achieving a compact arrangement configuration. Things.

[Brief description of the drawings]

FIG. 1 is a partially omitted overall side view of a crawler tractor.

FIG. 2 is a rear view of the crawler tractor with a part omitted.

FIG. 3 is a partially omitted front view showing an arrangement relationship between a working machine transmission and a traveling hydraulic pump.

FIG. 4 is an enlarged side view of a main part showing an arrangement relationship among a working machine transmission, a traveling hydraulic pump, and a step surface.

FIG. 5 is a plan view of a main part showing an arrangement relationship between a hydraulic oil tank and a traveling hydraulic pump.

[Explanation of symbols]

 2 Body 5 Engine 10 Operation / operation section 11a Hydraulic oil tank 12 Transmission for work equipment 15 Hydraulic pump for traveling 18 Input pipe 19 Input pipe

Claims (1)

[Claims] 1. A hydrostatic mobile agricultural machine configured to input rotational power of an engine provided at a front portion of a machine body to a traveling hydraulic pump and drive a traveling system by a shift output of a hydraulic motor interlocked with the hydraulic pump. In the transmission, a work implement transmission is disposed at a lower position in the operation section provided on the body, and the hydraulic pump is provided on the upper surface thereof,
To the left or right side of the machine traveling direction of the hydraulic pump,
An arrangement structure of a hydraulic oil tank used in a hydrostatic transmission, wherein a hydraulic oil tank of the hydraulic pump is mounted and fixed.