JP2008222131A - Crawler traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler traveling device capable of reducing a volume of a space for replenishing a bearing rotatably supporting a holding member of a rolling wheel with oils and fats, and capable of reducing an amount of the oils and the fats replenished in the space. <P>SOLUTION: In the crawler traveling device 20 equipped with a shaft 33 rotatably supported by a boss 31 through the bearing 32 and formed by fixing the rolling wheel 28 to the shaft 33 and connecting the other to a supporting frame 27, an oil seal 35 is attached to both ends between the shaft 33 and the boss 31, the space 36 for replenishing the bearing 32 with the oils and the fats is formed between an outer peripheral surface of the shaft 33 and an inner peripheral surface of the boss 31, a filling member 37 is interposed in the space 36, and the volume for the oils and the fats of the space 36 is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a crawler traveling device used for an agricultural working machine such as a combine or a tractor.

  A boss part of a wheel is fitted to a support shaft pivoted on a support cylinder on the frame side via a pair of bearings, and the wheel is fixed to the boss part. A crawler traveling device having a wheel support mechanism in which a space for supplying water is formed is known (see, for example, Patent Document 1).

  Further, a crawler having a lower roller support mechanism in which a lower roller bearing portion is fixed to an equalizer, a lower wheel shaft is pivotally supported on the lower roller bearing portion, and a lower roller body is attached to the lower wheel shaft. A traveling device is known (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 1-165788 (first page, FIG. 1) JP-A-8-99655 (page 3, FIG. 2)

  As the crawler traveling device increases, the distance between the bearings that support the wheels also increases, and the volume of the space for replenishing the bearings with oil and fat increases, so the amount of oil and fat that accumulates in the space increases.

  In view of the above circumstances, the present invention can reduce the volume of oil and fat to be supplied to the space by reducing the volume of space for supplying oil and fat to the bearing that rotatably supports the holding member of the wheel. An object of the present invention is to provide a crawler traveling device.

In order to achieve the above object, the present invention provides a shaft (33) and a boss (31) supported in a relatively rotatable manner via a bearing (32), and the shaft (33) and the boss (31). In the crawler traveling device (20) formed by fixing the wheel (28) on one side and connecting the other side to the support frame (27),
Oil seals (35) are attached to both ends between the shaft (33) and the boss (31), and the outer periphery of the shaft (33) and the inner periphery of the boss (31) Forming a space (36) for supplying oil and fat to the bearing (32);
Reducing the volume of fats and oils in the space (36) by interposing a filling member (37) in the space (36);
It is in the crawler traveling device characterized by this.

  The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

  According to the present invention, the bearing space between the shaft and the boss is closed with an inexpensive and lightweight filling member such as resin, so that the amount of bearing oil and fat accumulated in the space can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show an embodiment of the present invention, FIG. 1 is a side view of a tractor, FIG. 2 is a rear view of the tractor, and FIG. 3 is an enlarged cross-sectional view of a wheel support part.

  As shown in FIGS. 1 and 2, the tractor 1 has a traveling machine body 2 supported by a pair of left and right crawler traveling devices 20, and an engine (not shown) is mounted on the front portion of the traveling machine body 2. And covered with a bonnet 3. A three-point link mechanism 5 is disposed at the rear of the traveling machine body 2 and is connected to a work machine (not shown) such as a rotary type tiller.

  A driver's seat 7 covered with a cabin 6 is disposed at the center of the traveling machine body 2, and a seat seat 8 that is rotatable in the front-rear direction is disposed in the driver's seat 7. In FIG. 1, the seat 8 is shown in a state of being rotated so as to face backward.

  When the tractor 1 is moved forward by arranging the seat seat 8 so as to be rotatable, the seat seat 8 is rotated forward, and an operator seated on the seat seat 8 can drive forward. it can. When the tractor 1 is moved backward, the seat seat 8 can be rotated backward so that an operator seated on the seat seat 8 can drive while facing the rear. In other words, the operator seated on the seat 8 can always drive the tractor 1 in the traveling direction.

  A rear upper window 10 and a rear lower window 11 having substantially the same size as the window formed in front of the cabin 6 are formed at the rear of the cabin 6. The height D of the rear lower window 11 is configured to be larger than ½ of the height E of the rear upper window 10, and the visibility of the rear lower part of the tractor 1 is secured.

  As shown in FIG. 1, the seat 8 has a position where A <(L1 / 2), where L1 is the total length of the tractor 1 and A is the distance from the rear end of the tractor 1 to the seat 8. When the distance from the center of the drive sprocket 22 of the crawler traveling device 20 to the center of the driven sprocket 25 is L2, and the distance between the center of the drive sprocket 22 of the crawler traveling device 20 and the seat 8 is B, If it is arranged at a position where B≈ (L2 / 2), that is, near the turning center of the tractor 1, the turning operation can be facilitated.

  Since the tractor 1 is in front balance, when the tractor 1 is operated backward with the seat seat 8 facing backward, the speed transmitted to the crawler traveling device 20 is fixed at a low speed. The balance of the aircraft at start and stop can be maintained, making it easier to drive.

  The crawler traveling device 20 includes a traveling frame 21, a drive sprocket 22 rotatably supported on a front end portion of the traveling frame 21, and supported by the traveling frame 21 so as to be movable in the front-rear direction and toward the rear. A biased support member 23, a driven sprocket 25 rotatably supported by the support member 23, an upper rolling wheel 26 rotatably supported on the upper portion of the traveling frame 21, and a lower portion of the traveling frame 21 A support frame 27 supported by the support frame 27 and a lower roller 28 rotatably supported by the support frame 27. The drive sprocket 22, the driven sprocket 25, the upper wheel 26, and the lower wheel 28 are provided. The crawler 30 is wound around the outer periphery.

  The crawler 30 is driven by rotating the drive sprocket 22 by the output of the engine to move the tractor 1 forward or backward.

  As shown in FIG. 3, the lower roller 28 rotates via a boss 31 fixed to the support frame 27 (see FIG. 2) and a pair of bearings 32 arranged on the boss 31 at a predetermined interval. A shaft 33 supported freely and oil seals 35 attached to both ends of the boss 31 are provided, and the lower roller 28 is fixed to both ends of the shaft 33. The boss 31 is formed with a supply port 31a for supplying fats and oils such as grease. A female screw is formed on the inner peripheral surface of the supply port 31a. A plug 31b is screwed into one end of the supply port 31a so as to close the supply port 31a. A cylindrical filling member 37 formed of a synthetic resin such as vinyl chloride is disposed in a space 36 surrounded by the boss 31, the shaft 33 and the pair of bearings 32.

  Accordingly, the volume of the space 36 is reduced by the volume of the filling member 37. Then, by supplying the oil and fat for lubrication of the bearing 32 to the space 36 whose volume has been reduced, the volume of the oil and fat supplied to the space 36 can be reduced.

  In the above-described embodiment, the case where the boss 31 is fixed has been described. However, the shaft 33 is fixed to the traveling frame 21 or the support frame 27, and the boss 31 is rotatable about the shaft 33. Even if it is a structure that supports and fixes the lower roller 28 to the boss 31, it is possible to obtain the same operations and effects as in the above embodiment.

It is a side view of a tractor. It is a rear view of a tractor. It is an expanded sectional view of a wheel support part.

Explanation of symbols

20 Crawler traveling device 27 Support frame 28 Rolling wheel (lower rolling wheel)
31 Boss 32 Bearing 33 Shaft 35 Oil seal 36 Space 37 Filling member

Claims (1)

In a crawler traveling device comprising a shaft and a boss that are relatively rotatably supported via a bearing, and a wheel fixed to one of the shaft and the boss and the other connected to a support frame.
Oil seals are attached to both ends between the shaft and the boss, and a space for supplying oil and fat to the bearing is formed between the outer peripheral surface of the shaft and the inner peripheral surface of the boss,
Reducing the volume of fats and oils in the space by interposing a filling member in the space;
The crawler traveling device characterized by the above-mentioned.

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