JP2007253662A - Crawler traveling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crawler traveling device facilitating its mounting on and working of the side fitted with it when incorporating a seal device in a traveling wheel of the crawler traveling device, with excellent oil tightness of a seal and excellent supporting accuracy. <P>SOLUTION: The boss side seal 23 and the shaft side seal 30 of an oil seal device C are constituted of outer rings 25 and 31 and inner rings 28 and 33, and are provided with elastic bodies 27a and 27b, respectively, between each pair of the outer rings and the inner rings. Both of the inner rings are made to abut on each other and are floated and supported in a lubricating oil chamber. The outer ring 31 of the shaft side seal 30 has a boss part 34 oil-tightly fitted to a shaft. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a crawler traveling device used for an agricultural machine, a construction machine or the like, and more particularly to a structure of an oil seal device disposed on a shaft support portion of the traveling wheel.

  Conventionally, the technique of the seal structure used for the traveling wheel of a crawler traveling apparatus is already known (refer patent document 1).

JP 2005-53280 A

  However, in the conventionally known one described in Patent Document 1 (see FIG. 3 in particular), the seal holding shape is processed on the traveling wheel and the bracket main body side with the oil seal interposed therebetween.

  Therefore, in this type of structure, since it is necessary to obtain a certain sealing accuracy, the selection of the material by the molding upper hole in the casting is limited, and the processing method of the bracket body that is troublesome in internal processing is limited. There were problems such as.

  Accordingly, the present invention aims to provide a crawler traveling device that improves the above-described conventional problems and allows easy selection and internal processing of these materials, while providing high sealing accuracy.

According to the first aspect of the present invention, the support boss (21) supported by the body frame, and the support shaft (14) rotatably supported by the support boss (21) via the bearing (22). A traveling wheel (16) fixed to the support shaft (14), an oil seal device (C) interposed between the support boss (21) and the traveling wheel (16), and the traveling wheel. A crawler traveling device (6) comprising a crawler (12) supported by a wheel (16),
The oil seal device (C)
A boss side seal having an outer ring (25) fixed to the support boss (21), an inner ring (28), and an elastic body (27a) interposed between the outer ring (25) and the inner ring (28). (23)
An outer ring (31) fitted and arranged on the traveling wheel (16), an inner ring (33), and an elastic body (27b) interposed between the outer ring (31) and the inner ring (33). A shaft side seal (30) having,
The inner ring (28) of the boss-side seal (23) and the inner ring (33) of the shaft-side seal (30) are in contact with each other and are floatingly supported in the lubricating oil chamber (35).
This is the crawler traveling device having the first feature.

Further, in the present invention according to claim 2, the outer ring (31) of the shaft-side seal (30) has a boss portion (34) fitted into the support shaft (14) in an oil-tight manner.
This is the crawler traveling device having the second feature.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it has no influence on a claim by this.

  According to the first aspect of the present invention, since both the boss side seal and the shaft side seal have the outer ring, it is not necessary to process the support boss and the traveling roller for holding the seal device, and both the inner rings are floatingly supported. In combination with this, the processing is easy, the support accuracy is high, and the sealing performance can be improved.

  According to the second aspect of the present invention, since the outer ring of the shaft-side seal has the boss portion that is oil-tightly fitted to the support shaft, the support accuracy of the shaft-side seal is improved and high sealing performance is maintained. be able to.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view when the present crawler device is implemented on a tractor. 1 is a tractor traveling body, 2 is a body frame, and on the body frame 2 is a bonnet from the front in the same manner as a normal tractor. 3, an engine 4, a cabin 5, and the like. In the cabin 5, a driving control unit including an operation handle and various operation levers is provided.

  In addition, a three-point link device S for mounting a work machine for performing various operations and the like is provided below the cabin 5 below.

  Further, a pair of left and right crawler traveling devices 6 and 6 are provided at the lower part of the body frame 2, and the crawler traveling device 6 includes a front drive sprocket 7, a rear idler 8, and front and rear thereof. A long traveling frame 9 that connects each supporting member in position is configured by winding a rubber crawler 12 between the drive sprocket 7 and the idler 8 via an upper roller 10 and lower rollers 11, 11. Yes.

  FIG. 2 is an overall perspective view of the lower roller. The lower roller 11 includes two swing plates 15 and 15 that connect the bosses of the support shafts 14 and 14 provided at the front and rear positions. A pair of running wheels 16, 16 sandwiched from the left and right direction are fitted to the support shaft 14, and these are fixed by nuts 17 from both outer sides. A separate attachment shaft 19 (see FIG. 1) is inserted through the boss 18 and attached to the front and rear portions of the traveling frame 9. Each of these traveling wheels 16... Contacts the inner peripheral surface of the crawler 12 to support the inside of the crawler 12 and is rotatable by the rotation of the crawler 12. Corresponding to the undulation of the traveling surface of the airframe 1, when a part of the crawler 12 swings up and down, each traveling wheel 16... Swings up and down around the mounting shaft 19. And it is comprised so that the traveling body 1 can always drive | work smoothly even if the conditions of a driving surface are bad.

  Next, FIG. 3 is a partially cut-away front sectional view of FIG. 2, and a pair of left and right bearings 22, 21 inside cylindrical support bosses 21, 21 welded to both front and rear ends of the swing plate 15. 22, the support shaft 14 is supported so as to be rotatable with respect to the support boss 21, and oil seal devices C and C described later are interposed on both outer sides of the pair of bearings 22 and 22. Then, the pair of running wheels 16 and 16 are fitted to both outer sides, and are fixed to the support shaft 14 by the nuts 17.

  In addition, the code | symbol 20 of drawing shows the oil supply port of lubricating oil.

  4 and 5 are partially enlarged cross-sectional views showing details of the oil seal device. FIG. 4 is an assembled state diagram, and FIG. 5 is an exploded state diagram.

  That is, the boss-side seal 23 on the side of the support boss 21 of the oil seal device C is positioned in contact with the side of the bearing 22 with its outer shape fitted to the support boss 21 in an oil-tight manner. An outer ring 25 is provided. The outer ring 25 is fixed to the support boss 21 with bolts 24 from the outside, and a tapered surface 26a is provided on the inner side of the outer ring 25. An elastic body 27a is interposed on the inner side of the outer ring 25. Thus, the inner ring 28 having the same tapered surface 26b is provided on the outer side facing the elastic body 27a.

  On the other hand, the shaft-side seal 30 on the side of the support shaft 14 has an outer shape of the outer ring 31 fitted and arranged on the traveling wheel 16, and is substantially U-shaped in the inner shape of the traveling wheel 16, that is, in a side view of the drawing. In addition to the shape, an inner portion that fits the support shaft 14 is formed in a boss portion 34 along the support shaft 14, and a tapered surface 32 a is provided on the inner side of the outer ring 31, and the tapered surface 32 a An elastic body 27b is interposed on the inner side, and an inner ring 33 having a tapered surface 32b is also provided on the outer side facing the elastic body 27b.

  That is, the outer ring 31 of the shaft-side seal 30 is fitted into the support shaft 14 in an oil-tight manner, and the running wheel 16 is fitted into the support shaft 14 and tightened with the nut 17 from the outside. It fits oil-tight.

  The inner ring 28 of the boss-side seal 23 and the inner ring 33 of the shaft-side seal 30 come into contact with each other and are floatingly supported in the lubricating oil chamber 35.

  Accordingly, since the outer rings 25 and 31 and the inner rings 28 and 33 can be processed separately from the main body, the processing becomes extremely easy, and it is limited to the selection of materials and the internal processing as in the prior art. Nothing will be lost.

  With the above configuration, when the operator starts the engine 4 and travels on the traveling machine body 1, the crawler 12 rotates and the traveling machine body 1 moves due to the rotation of the drive sprocket 7. At this time, the traveling rollers 16 and 16 of the lower roller 11 are in contact with the inner peripheral surface of the crawler 12 to support the crawler 12 from the inside. However, if the traveling surface is undulated, the lower roller 11 Corresponds to the vertical swing of the crawler 12 and swings in the left-right direction in FIG. 1 around the mounting shaft 19 of the travel frame 9 to support the inner peripheral surface of the crawler 12, so Even so, the crawler traveling device 6 works so as to travel smoothly.

  Then, as the crawler 12 rotates, the traveling wheel 16 that contacts the crawler 12 rotates together with the support shaft 14.

  At the same time, only the inner ring 33 of the shaft-side seal 30 rotates while sliding on the inner ring 28 of the boss-side seal 23.

  Accordingly, the outer side of the support boss 21 that is the storage surface of the oil seal device C of the boss side seal 23 and the outer side of the running wheel 16 that is the storage surface of the oil seal device C of the shaft side seal 30 are respectively in the inside thereof. Since the outer rings 25 and 31 and the inner rings 28 and 33 are provided, no special processing is required.

  Further, both elastic bodies 27a and 27b in the lubricating oil chamber 35 are supported floating on both upper and lower surfaces by respective tapered surfaces 26a, 26b, 32a and 32b, and the inner rings 28 and 33 are in contact with each other. As a result, high support accuracy can be obtained.

  Further, an oil film is formed on the sliding surfaces of the inner rings 28 and 33, so that the sliding surfaces are less worn and the leakage of the lubricating oil to the outside at this portion is surely prevented.

  In short, in the case of the present invention, in particular, since the boss side seal 23 and the shaft side seal 30 both have the outer rings 25 and 31, when the oil seal device C is incorporated, the support boss 21 side and the traveling side. No processing for holding the oil seal device C is required on the side of the roller wheel 16, and both the inner rings 28 and 33 corresponding to the both outer rings 25 and 31 are floatingly supported, so that high support accuracy can be expected. As a result, the sealing performance can be improved.

  Further, since the outer ring 31 of the shaft-side seal 30 has a boss portion 34 that fits into the support shaft 14 in an oil-tight state, processing is easy and the support accuracy of the shaft-side seal 30 is further improved. Thus, high sealing performance can be maintained.

  Although the present embodiment has been described with respect to the tractor, the present invention may be applied to other models, or a so-called swing that swings up and down with the undulating swing of the crawler that abuts the lower roller. Although described with the example of the dynamic rolling wheel, this may be adopted as a fixed rolling wheel.

The whole tractor side view. The whole perspective view of a driving wheel. The partially cut-away front sectional view of a traveling wheel. The assembly state figure which shows the detail of an oil seal apparatus. The disassembled state figure which shows the detail of an oil seal apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 6 Crawler traveling apparatus 11 Lower roller 12 Crawler 14 Support shaft 16 Traveling wheel 21 Support boss 22 Bearing 23 Boss side seal 25, 31 Outer ring 27a, 27b Elastic body 28, 33 Inner ring 30 Shaft side seal 35 Lubricating oil chamber C Oil seal device

Claims (2)

A support boss supported by the body frame, a support shaft rotatably supported by the support boss via a bearing, a running wheel fixed to the support shaft, the support boss, and the running wheel. In a crawler traveling device comprising an oil seal device interposed between the crawler and a crawler supported by the traveling wheel,
The oil seal device is
A boss-side seal having an outer ring fixed to the support boss, an inner ring, and an elastic body interposed between the outer ring and the inner ring;
A shaft-side seal having an outer ring fitted and disposed on the traveling wheel, an inner ring, and an elastic body interposed between the outer ring and the inner ring,
The inner ring of the boss-side seal and the inner ring of the shaft-side seal are in contact with each other and floatingly supported in the lubricating oil chamber,
Crawler traveling device. The outer ring of the shaft-side seal has a boss portion that is oil-tightly fitted to the support shaft.
The crawler traveling device according to claim 1.

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