JP2000000011A - Combine hydraulic cylinder mounting device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To devise a machine-side mounting device for a hydraulic cylinder for raising and lowering a reaping unit to make the mounting structure simple and smart. SOLUTION: In a combine having a hydraulic cylinder 21 for elevating and lowering a reaping part installed over a body and a reaping part, an axle case part 2 projecting laterally from a transmission case M is provided.
The cylinder cylinder 21A of the hydraulic cylinder 21 is rotatably fitted to and supported by the cylinder 2a in a state having a coaxial center with the crawler axle axis X. An oil supply / discharge passage a to / from the hydraulic cylinder 21 is formed in the axle case portion 22a in which the hydraulic cylinder 21 is supported, and communicates with an oil passage b in an oil passage plate 20 mounted on a lateral outer wall of the transmission case M. Let it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder mounting apparatus for a combine, and more particularly, to a structure of a body-side mounting apparatus for a hydraulic cylinder for lifting and lowering a cutting unit with respect to the body.

[0002]

2. Description of the Related Art In a general combine, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-228561, a hydraulic cylinder is installed over a main frame for supporting a cutting section and a body frame. Was. in this case,
As shown in the publication, there is also a structure in which a hydraulic cylinder and a reaping main frame are connected via a link.

[0003]

In the prior art, a fulcrum for rotatably supporting the hydraulic cylinder is provided on the body frame at a position near the crawler driving axle between the right and left between the crawler traveling device and the transmission case. There is
Since the hydraulic cylinder was forcibly arranged in the narrow space between the crawler traveling device and the transmission case, it was difficult to lay out the machinery and structures located nearby. Was. In other words, the hydraulic cylinder is supported in a tight space with sufficient strength,
In addition, in order to be able to perform the maintenance and inspection, the structure is complicated and a large number of parts are required.

In addition, since a structure such as an airframe is present immediately above the cylinder, the supply / discharge hoses to the hydraulic cylinder are taken out from the cylinder and arranged, so that the vehicle travels. As a result, special measures such as providing a cover to avoid contact between the supply / discharge hose and other objects have been required. An object of the present invention is to devise a device for mounting a hydraulic cylinder for raising and lowering a mowing unit on a machine side so that the mounting structure is simple and smart. Another object is to provide pipes for the hydraulic cylinder without protruding.

[0005]

[Means for Solving the Problems] [Constitution] In the first invention, a mowing portion is supported on a machine body so as to be able to swing up and down, and a hydraulic cylinder for raising and lowering the mowing portion is provided between the machine body and the mowing portion. In the combined hydraulic cylinder mounting device, the machine cylinder side end of the hydraulic cylinder is rotatably supported on an axle case portion protruding laterally from a transmission case mounted on the front of the machine. It is characterized by the following.

A second invention is characterized in that, in the first invention, a supply / discharge oil passage for the hydraulic cylinder is formed in an axle case portion on which the hydraulic cylinder is supported.

According to the first aspect of the present invention, since the hydraulic cylinder is supported on the axle case projecting laterally from the transmission case, a mounting portion for the lifting cylinder is formed on the existing axle case. This eliminates the need for a difficult design in which the stay is sufficiently extended from the body frame while avoiding interference with the axle case portion as in the related art. The axle case portion originally has sufficient strength to support the crawler traveling device, so that it is possible to support the hydraulic cylinder.

According to the second aspect of the present invention, there is provided a means for forming a supply / discharge oil passage in a cast or die-cast case using a structure in which the hydraulic cylinder is directly supported on the axle case. As a result, since at least the external piping near the hydraulic cylinder can be omitted, the supply / discharge hose protruding downward from the hydraulic cylinder as in the related art is eliminated, and the possibility of contact with other objects can be eliminated.

[Effect] In the combine according to the first or second aspect, the hydraulic cylinder is supported by using the axle case part of the existing part having sufficient strength.
A hydraulic cylinder mounting device with a smart design that has sufficient strength but has a simple and compact mounting structure has been realized.

In the hydraulic cylinder mounting device according to the second aspect, since the supply / discharge oil passage can be formed in the axle case and the external oil passage is eliminated, the fear of contact with other objects can be eliminated.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a cutting unit A is connected to a traveling machine body B equipped with a crawler traveling device 10, a threshing device 11, a Glen tank 12, and the like so as to swing up and down around an axis Q. A combine is configured.
A single-acting lifting cylinder 21 which is a hydraulic cylinder is provided between the main reaping frame 13 and the transmission case M on the side of the machine body. It is made to descend.

FIG. 2 shows a schematic transmission system in a transmission case M, wherein E is an engine, 1 is a tension clutch, 2
Is an input shaft, 3 is a two-stage PTO transmission mechanism, 4 is a PTO shaft for driving the mowing unit A, 5 is a three-stage auxiliary transmission mechanism, and 7 is a three-stage forward and one-stage reverse main unit. Transmission mechanism, 8
Denotes a side clutch, and 9 denotes left and right crawler axles. The main transmission mechanism 7 includes a multi-plate type transmission hydraulic clutch 6a, 6b, 6c, 6d on the transmission shaft of the normal bite gear pair that constitutes each shift speed.
And these four hydraulic clutches 6a, 6b, 6
This is a known configuration in which pressure oil is supplied alternatively to c and 6d to change the speed.

Each of the hydraulic clutches 6a, 6b, 6c, 6d
Is configured in the clutch operating device 14 using the lubricating oil in the transmission case M as hydraulic oil. As shown in FIG. 3, the discharge pressure of the trochoid type hydraulic pump P mounted on one end of the input shaft 2 is reduced by a rotary. It is selectively supplied to one of the hydraulic clutches 6a, 6b, 6c, 6d via a valve 15. In addition, 16 is an accumulator, 17 is a high pressure relief valve, 18 is a strainer, and 19 is a low pressure relief valve.

Pressure oil to each of the hydraulic clutches 6a, 6b, 6c, 6d is supplied through an oil passage (not shown) formed through the transmission shaft, and an oil passage on the shaft end side of these transmission shafts. The hydraulic devices such as the hydraulic pump P and the high-pressure relief valve 17 described above are formed by mounting an oil passage plate 20 having a notched groove for forming an oil passage on a contact surface on a lateral outer surface of the transmission case M. Connected via an oil passage.

As shown in FIGS. 2, 4, and 5, the transmission case M is formed by fitting left and right axle cases 23, 23 to a main body case 22 in which the auxiliary transmission mechanism 5, the main transmission mechanism 7, and the like are housed. The cylinder case 21A of the elevating cylinder 21 is rotated relative to the portion of the main body case 22 in which the axle case 23 is fitted, that is, the axle case portion 22a, coaxially with the rotation axis X of the axle. It is equipped with an external fitting so that it can move freely.

The axle case portion 22a and the axle case 23 are formed into a cylindrical shape with the axle rotation axis X as the center, and are press-fitted to be connected and integrated.
, A radial oil passage 25 communicating with the cylinder chamber 21s, and an internal oil passage b of an oil passage plate 20 attached to the side of the transmission case M. A supply / discharge oil passage a composed of the take-out oil passage 26 is formed. Reference numerals 27 and 28 denote O-rings for an oil seal.

That is, the elevating cylinder 2 formed to be connected to the oil passage b formed inside the oil passage plate 20
A single oil supply / discharge passage a to 1 is formed in the axle case portion 22a, and external pipes such as hoses and metal pipes are omitted. If the snap ring 29 is removed from the axle case portion 22a, the lifting cylinder 21 can be slid left and right with respect to the axle case portion 22a, and can be freely assembled and removed.

[Alternative Embodiment] The part of the cylinder cylinder 21A in which the axle case part 22a is fitted is replaced with the cylinder cylinder 21A.
It is convenient if the hydraulic cylinder 21 can be easily attached and detached irrespective of other parts as a two-part structure in which the main body portion having A and the semicircular mounting portion are bolted.

[Brief description of the drawings]

FIG. 1 is a side view of the front of the combine.

FIG. 2 is a diagram showing a schematic transmission system in a min case;

FIG. 3 is an operation circuit diagram of a shift hydraulic clutch.

FIG. 4 is a side view of a transmission case showing a mounting structure of a lifting cylinder.

FIG. 5 is a cross-sectional view showing a structure for mounting the lifting cylinder on the machine body side

[Explanation of symbols]

 21 Hydraulic cylinder 22a Axle case part a Supply / discharge oil passage A Cutting part B Aircraft M Transmission case

Claims (2)

[Claims] A hydraulic cylinder mounting device for a combine, wherein a reaping unit is pivotally supported on a machine body so as to be able to swing up and down, and a hydraulic cylinder for raising and lowering the reaping unit is provided between the machine body and the reaping unit. A combine hydraulic cylinder mounting device, wherein a fuselage side end of the hydraulic cylinder is relatively rotatably supported on an axle case portion protruding laterally from a transmission case mounted on a front portion of the fuselage. 2. The combine hydraulic cylinder mounting device according to claim 1, wherein a supply / discharge oil passage to the hydraulic cylinder is formed in the axle case portion on which the hydraulic cylinder is supported.