JPS6013741Y2 - Roller support structure in crawler type traveling device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wheel support structure in a crawler type traveling device.

A general type of wheel support structure in a crawler type traveling device, as shown in Japanese Utility Model Application Publication No. 49-147735, is a structure in which a wide wheel is fitted around a wide wheel so as to be rotatable around the axis. Floating seals are installed on both end faces of the roller to seal the fitting support surface of the roller, and the floating seal is protected by a seal cover fitted to the shaft at the outer end of the roller. The shaft is configured to be mounted on the truck frame with both ends supported, but this conventional structure requires seal covers on both sides in addition to the wheels, which increases the number of parts and increases costs. Moreover, since the members supporting both ends of the shaft are located on the outside of the rotating wheels, there is a problem in that foreign objects such as grass stalks are likely to become entangled.

Therefore, there is no need for a separate seal cover from the wheels.
In order to be able to seal the mounting surface of the wheel and to prevent the support member from hanging down on the outer side of the wheel when mounting the wheel on the truck frame, a cylindrical body fixed to the truck frame is used. We have proposed a structure (see Utility Model Application Publication No. 51-74929) in which the pivot is rotatably supported and the left and right wheels are rotatably fitted to the pivot portion protruding from the cylindrical body. Even the proposed method is still insufficient in the following points.

(a) The cylinder body that supports the spindle for fitting the wheels is fixed and permanently attached to the truck frame, so the work of assembling the spindle and the rollers on the spindle is done on the truck. The work is difficult because the entire frame must be treated as a unit.

(b) Since the inside of the cylinder and the part where the wheels are fitted are sealed separately, the sealing structure becomes complicated, and the gap created between the end of the cylinder and the side of the wheels is covered with grass. The seal part is easily damaged due to wrapping and mud adhesion.

The present invention has been further improved in order to solve the above-mentioned problems that occur with the previously proposed products.It does not require a seal cover and can accurately seal the interior with a small number of seals. The present invention provides a rolling wheel support structure in which the seal is reliably protected from foreign objects and the like, and furthermore, the assembly work is easier than that of previously proposed structures.

Next, the embodiment shown in the drawings will be described.

FIG. 1 shows a side view of the combine harvester, in which a threshing device 7 is mounted above a machine stand 6 supported by both crawlers 3 at the bottom of both sides of the machine body, and in front of it is a weeding plate 8 and a pulling device 9.
, a cutting section equipped with a cutting blade 10, a conveying body 11, etc., and is constructed in the same manner as the conventional type.

Further, the track frame 1 supporting the crawler 3 has a long pipe structure, and the track frame 1 is connected to the machine base 6 via a mounting frame 12. A drive wheel 2 supporting or extending from the drive side of the fuselage is visible;
An idler wheel 14 supported by a bracket 13 with an adjuster is visible at the rear of the truck frame 1, and four rolling wheels A are installed along the lower part of the truck frame 1, and one rolling wheel A is installed at the upper part. A conventional crawler 3 is wrapped around these driving wheels 2, each rolling wheel A, and an idler wheel 14.

Side U-shaped mounting brackets 15 are fixed to the lower and upper surfaces of the truck frame 1 where each wheel A is attached, and supports are integrally formed at the center front and rear of the lateral cylindrical boss B. The inner part 16 is fitted into the mounting bracket 15 and fixed by screwing in the bolts 17 and 17 from the front and back, and the cylindrical boss B is formed with large diameter annular end portions as free ends at both ends. A collar 18 is interposed inside the shaped boss B, and both bearings 5 are fitted therein, and the both ends of the rotating shaft 4, which is fitted into both the bearings 5, are inserted from both ends of the cylindrical boss B. The rotating shaft 4 is formed to be slightly long so as to extend outward, and both ends 4a of the rotating shaft 4 are formed in an elliptical shape.

A is a wheel, and the track frame 1 is sandwiched between the wheels and the rotary shaft 4 is attached to both ends of the rotating shaft 4.
A shaft hole 20 is formed into which the shaft hole 20 is inserted, and a recess a is formed on the outer periphery of the cylindrical portion 21 on the outer periphery of the shaft hole 20 on the inner surface.
With the rolling wheel A fitted onto the rotating shaft 4, the annular end portion of the cylindrical boss B is fitted inside the recess a, and the outer circumferential surface of the recess a and the outer circumferential surface of the annular end portion are aligned in the axial direction. They are installed so that they overlap with a slight gap C of a certain length between them.

Further, in a fitted state in which the inner end of the cylindrical portion 21 of the roller wheel A is joined to the bearing 5 in the cylindrical boss B, a seal S is fitted inside the recess a of the roller wheel A. The floating seal is formed by fitting packings 23 a, 23 b, which have buffer and spring functions, onto the outer peripheries of both adjacent floating rings 22 a, 22 b made of special alloy casting, and both floating rings 22 a, 22
b is fitted into the cylindrical portion 21 of the wheel A, one packing 23a is fitted so as to be rotatable against the inner surface on the inner side of the recessed portion a, and the other packing 23b is fitted against the inner circumferential surface of the annular end portion a. The installation is configured by fitting in a fixed manner.

An O-ring 24 is fitted into the fitting portion of the shaft hole 20 of the rolling wheel A and the rotating shaft 4, and a threaded hole 26 for a bolt 25 is inserted in the axial direction from the end surface of the rotating shaft 4. A screw hole 28 for the bolt 27 is formed at an eccentric position, and an elliptical hole 30 into which the elliptical end 4a of the rotating shaft 4 fits and a round hole 28 for the bolt 27 to be inserted are formed in the flat plate-made detent fitting 29. Holes 31 are respectively formed, and one side 32a of a rotation prevention plate 32 through which both bolts 25 and 27 can be inserted is formed so as to be bendable.

In addition, a lubrication port 33 is formed on the rolling wheel A so that oil can be poured to the seal S side, and a blind plug 33a can be fitted thereto, and a lubrication port 33 that can be used to lubricate the bearing 5 side is also formed on the cylindrical boss B. 34
It is installed and configured so that a blind plug 34a can be fitted thereinto.

Therefore, the seals S are fitted to both ends of the rotating shaft 4 using the fitting device, and the oval hole 30 of the rotation stopper 29 is fitted to the end 4a of the rotation shaft 4, and the rotation is prevented. The anti-rotation plate 32 is joined to the outer surface of the metal fitting 29, and the bolt 2
5 through the stopper plate 32 and screwed into the screw hole 27 of the rotating shaft 4, and then insert the bolt 27 through the stopper plate 32 and into the round hole 31.
When the rotation stopper plate 32 is screwed into the screw hole 28 and both bolts 25 and 27 are tightened, one side 32a of the rotation prevention plate 32 is bent at a right angle and engaged with the heads of both bolts 25 and 27.
can be fitted to the rotating shaft 4 so as to prevent it from rotating.

Also, add oil from each oil filler port 33.
Enter 4a.

Therefore, the two rollers A, A on both ends of the rotary shaft 4, which are freely supported in rotation, can roll into contact with the inner circumferential surface of the crawler 3 and provide support, but the three concave surfaces of the roller A and the cylinder Since the end portions of the shaped boss B overlap with each other while maintaining the gap C, a dustproof effect can be exerted on the inner seal S, etc.

In this way, the present invention connects the rotating shaft 4 to the cylindrical boss B, which is detachably attached to the truck frame 1, via the bearing 5.
In a wheel support structure in a crawler-type traveling device, in which the wheels A and A are respectively fitted to both end portions of a rotating shaft 4 protruding from both sides of a cylindrical boss B, each of the wheels A is The shaft hole 20 of the central cylindrical portion 21 is fitted onto the rotary shaft 4 so as to prevent rotation, and an O-ring 24 is interposed on each fitting surface, and a recess a is formed on the outer periphery of the cylindrical portion 21. is formed so that the recess a fits over the outer periphery of the annular end of the cylindrical boss B when the roller is assembled, and the recess a of the roller and the annular end of the cylindrical boss are formed inwardly from the overlap portion. Since the floating seal S is interposed in the space formed between the two parts, there are the following advantages.

■ A recess a is provided on the outer periphery of the cylindrical portion 21 inside the wheel A, so that the recess a fits over the outer periphery of the annular end of the cylindrical boss B, and is formed inside the overlap portion. Since a floating seal is installed in the space where the rotation is made and an O-ring 24 is installed on the fitting surface to the rotational shaft 4, a known structure requiring a seal cover (Utility Model Application No. 49-14773
Compared to the one in Publication No. 5), the structure is simpler because the roller itself contains a seal for protection.Furthermore, a floating seal is not only installed in the roller recess, but also a floating seal is installed on the roller fitting surface. Since the O-ring 24 is also interposed, internal sealing is reliably performed even at the rotating shaft fitting portion, and dustproofness is significantly improved.

- Since the cylindrical boss B is removably attached to the truck frame 1, the cylindrical boss B1 rotating shaft 4, rolling wheels A, and A can be assembled separately from the truck frame. The same kind of thing already proposed (Utility Model No. 51-749
2N Publication), assembly and disassembly work is significantly easier.

■ The annular end of the cylindrical boss B is inserted into the fourth section a of the wheel A to create a labyrinth structure to protect the seal, and the cylindrical boss is attached to the truck frame between both wheels. Since there is no supporting member on the outer side of the wheel 17, and in the military, the wheel is installed in a structure that prevents it from freely rotating with respect to the rotating shaft 4, these structures combine to prevent grass, etc. It is possible to effectively prevent winding, smooth the operation, and improve durability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a side view of the unit, Fig. 2 is a side view of the main parts, Fig. 3 is a side view of Fig. 2 with the wheels removed, and Fig. 4 is a side sectional view of the main part, FIG. 5 is a detent fitting, FIG. 6 is a sectional view of a part of FIG. 4, and FIG. 7 is a part of FIG. 4. 1... Truck frame, A... Rolling wheel, 2 = Drive wheel, 3... Crawler, 4... Rotating shaft, 5... Bearing, B... Cylindrical boss, a... Concave portion, b... End of boss,
S...Seal, C...Gap.

Claims (1)

[Scope of utility model registration request] Cylindrical boss B that is detachably attached to the truck frame 1
The rotating shaft 4 is supported via a bearing 5, and the cylindrical boss B
Rolling wheels A,
In the wheel support structure in a crawler type traveling device configured to fit each wheel A, each wheel A is attached to the center cylinder portion 21.
The shaft hole 20 is fitted onto the rotating shaft 4 in a non-rotating manner, and the OIJ ring 24 is interposed on the fitting surface, and a recess a is formed in the outer circumferential portion of the cylindrical portion 21. When the wheel is assembled, the recess a overlaps and fits into the outer periphery of the annular end of the cylindrical boss B, and there is a space between the recess a of the wheel and the annular end of the cylindrical boss inward from the overlap portion. A wheel support structure in which a floating seal S is interposed in a space formed in the space.