JP4054595B2 - Crawler guide device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crawler guide device used in a crawler traveling device such as a crawler tractor.
[0002]
[Prior art]
Conventionally, as a crawler type traveling vehicle, in a tractor with a crawler attached to a traveling part, a hydraulic motor is attached to a motor mounting housing at the front part of the traveling frame, a driving sprocket is attached to the output side of the hydraulic motor, and further, A crawler was wound around the driven sprocket and the crawler was driven by the drive sprocket.
[0003]
At this time, a crawler guide is provided in order to prevent the crawler that is in rolling contact with the lower roller from coming off the lower roller.
[0004]
[Problems to be solved by the invention]
However, since the conventional crawler guide described above is fixed with a bolt to the lower part of the swing arm pivotally mounted on the travel frame, the crawler travels on the uneven part or steps on a stone or the like during travel. In addition, a shocking thrust force from the crawler is directly applied to the bolt, and the bolt gradually loosens.
[0005]
Further, when the crawler guide is attached to the swing arm by the bolt, it is necessary to fix the swing arm and the crawler guide in a state where they are positioned in the height direction. However, the crawler guide is a heavy article made of a casting or the like. For this reason, it is difficult to position and install the crawler guide in a lifted state.
[0006]
The present invention has been made to solve such a problem, and an object of the present invention is to fix the guide member of the crawler by sharing the thrust force from the crawler during traveling. An object of the present invention is to provide a crawler guide device that can prevent loosening of a member and facilitate the mounting work of the guide member.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a swing arm (46) pivotally mounted on the traveling frame (14) so as to freely swing back and forth, and a swing arm (46). Further, a pair of front and rear lower rollers (40, 40), a crawler (34) that is in rolling contact with the pair of front and rear lower rollers (40, 40), and the rocker to prevent the crawler (34) from coming off. A crawler guide device comprising a guide member (52) fixed to a lower portion of the moving arm (46) via a fixing member (50),
Either one of a receiving surface (46d) and a protruding portion (52d) is formed on the front portion and the rear portion of the swing arm (46), and the receiving surface (46d) and the protruding portion (52d) are formed on either one of the receiving surface (46d) and the protruding portion (52d). The other one of the corresponding receiving surface (46d) and projection (52d) is formed on the guide member (52),
With the guide member (52) fixed to the swing arm (46), the swing arm (46) and the guide member (52) via the receiving surface (46d) and the protrusion (52d). It is characterized by contacting.
[0008]
According to a second aspect of the present invention, in the crawler guide device according to the first aspect, the guide member (52) is fixed to a substantially central portion in the front and rear direction of the swing arm (46), and
The receiving surface (46d) is formed on the front portion and the rear portion of the swing arm (46), and the protruding portion (52d) is formed on the guide member (52) corresponding to the receiving surface (46d). It is characterized by that.
[0009]
[Action]
According to the present invention, the crawler guide device includes a lower roller (40) that is pivotally attached to a swing arm (46) that can swing back and forth on a traveling frame (14), and a roller that rotates on the lower roller (40). In order to prevent the crawler (34) coming into contact with the guide member (52) fixed to the lower portion of the swing arm (46), for example, in this embodiment, the swing arm (46) is provided. A receiving surface (46d) is formed on the front and rear of the guide member, and a protrusion (52d) is formed on the guide member (52) corresponding to the receiving surface (46d). The receiving surface (46d) and the protrusion With the guide member (52) fixed to the swing arm (46) via (52d), the swing arm (46) and the guide member (52) are brought into contact with each other.
[0010]
Accordingly, even when the crawler (34) travels on the uneven portion or steps on a stone or the like during traveling, the impact force caused by the thrust from the crawler (34) is applied to the fixing member (50) and the contact portion (46d). , 52d), and the impact force applied to the fixing member (50) can be reduced to prevent loosening of the fixing member (50).
[0011]
In addition, the code | symbol in a parenthesis is for referring drawings, and does not limit this invention at all.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a side view of a crawler tractor to which the present invention is applied. In the figure, a tractor 10 includes a crawler type traveling device 12, and an engine 20 covered with a bonnet 18 on an upper frame (machine base) 16 connected to a traveling frame 14 of the traveling device 12. A three-point link mechanism 25 that includes a driver's seat 24 with a cabin 22 and that is equipped with a working machine such as a tillage device is mounted at the rear.
[0014]
The travel device 12 includes a drive casing 26 fixed to the front portion of the square pipe-shaped travel frame 14, drive wheels 28 supported via a hydraulic motor 27 attached to the drive casing 26, and the travel frame 14. An arm 30 that is slidably fitted and supported at the rear portion, and a driven wheel 32 that is rotatably supported by the arm 30, and a crawler 34 is wound between the driving wheel 28 and the driven wheel 32, The crawler tensioning mechanism 36 adjusts the tension of the crawler 34. In addition, two upper wheels 38 and one pair of front and rear lower wheels 40 and 40 are provided on the upper and lower sides of the traveling frame 14, and the upper and lower wheels 38 and 40 are crawlers. 34 is rolled.
[0015]
As shown in FIGS. 2 and 3, brackets 42 and 42 having holes 42a penetrating in the width direction of the crawler 34 are fixed at the lower portion of the traveling frame 14 by bolts 43. The shaft 44 is supported through. A swing arm 46 is pivotally mounted on the shaft 44 so as to be swingable back and forth. The swing arm 46 has a cylindrical portion 46a supported by the shaft 44 and a plane that is substantially orthogonal to the axis of the cylindrical portion 46a, and is arranged facing the crawler 34 at a predetermined interval in the width direction. Two plates 46b, and a bearing portion 46c fixed to the front and rear portions of the plate 46b so as to form a triangle with the tube portion 46a substantially parallel to the axis of the tube portion 46a. Yes.
[0016]
Further, as shown in FIG. 4, bearings 48, 48 are mounted on the bearing portion 46 c, and the lower roller 40 is attached by mounting bolts 39 and nuts 41 via the bearings 48, 48. The crawler 34 is in rolling contact with the lower roller 40. The crawler 34 is formed in an endless belt shape with rubber, synthetic resin, or the like, and a hole (not shown) that engages with the drive wheel 28 is formed at the center in the width direction. Further, a cored bar 35 is embedded in the crawler 34 at a predetermined equal interval along the belt-like direction, and a pair of left and right projections 35a is formed at the center side in the width direction of the crawler 34 of the cored bar 35. Is protruding. The protrusion 35a prevents the crawler 34 from being detached from the lower roller 40.
[0017]
However, the crawler 34 may be disengaged from the lower wheel 40 when traveling on uneven ground. Therefore, to reliably prevent the crawler 34 from coming off, the crawler is inserted into three bolt holes (not shown) formed in the lower portion of the swing arm 46 via three bolts (fixing members) 50. A guide (guide member) 52 is fixed. The crawler guide 52 is made of, for example, a casting formed by a forming unit, and has a ship shape that is bilaterally symmetric as viewed from the front as shown in FIGS.
[0018]
The crawler guide 52 has a rhombus-shaped mounting portion 52a in the front-rear direction substantially in the center, and an end portion in the front-rear direction rising in an arc shape along the outer periphery of the lower roller 40 in a side view. It has a symmetrical rising portion 52b and a guide portion 52c formed between the pair of left and right projections 35a, 35a of the crawler 34, which is formed at the lower portion of the guide body. The mounting portion 52a has three holes 53 formed at the apexes forming a triangle.
[0019]
The mounting portion 52 a is fitted between the two plates 46 b facing the swing arm 46 and fastened by the three bolts 50, whereby the crawler guide 52 is fixed to the swing arm 46. By disposing the crawler guide 52 between the pair of left and right projections 35a and 35a, the crawler 34 is prevented from being separated mainly by the rising portion 52b and the guide portion 52c. Is done.
[0020]
At this time, when a gap is generated between the mounting portion 52a and the two plates 46b, a thin plate spacer (not shown) is interposed as necessary so that no gap is generated.
[0021]
Here, in the present embodiment, a receiving surface 46 d is formed on the front and rear portions of the swing arm 46, and a protrusion 52 d corresponding to the receiving surface 46 d is formed on the crawler guide 52. With the crawler guide 52 fixed, the swing arm 46 and the crawler guide 52 are brought into contact with each other through the receiving surface 46d and the protrusion 52d.
[0022]
That is, as shown in FIG. 2, the swing arm 46 has an arc surface 46 'whose lower part is formed in an arc shape, and receiving surfaces 46d and 46d are formed in the front and rear portions connected to the arc surface 46', respectively. Has been. On the other hand, at a position corresponding to the receiving surfaces 46d, 46d of the crawler guide 52, a protruding portion 52d is formed to protrude upward.
[0023]
Then, when the crawler guide 52 is fixed to the swing arm 46 with the bolt 50, if the swing arm 46 and the crawler guide 52 are brought into contact with each other via the receiving surface 46d and the protrusion 52d, in that state, A hole formed in the lower portion of the swing arm 46 and a hole 53 (see FIG. 5) formed in the crawler guide 52 are positioned in the height direction, and thus the three bolts 50 are placed at that position. If inserted, the swing arm 46 and the crawler guide 52 can be easily positioned and fixed.
[0024]
In the present embodiment, the case where the receiving surface 46d is formed on the swing arm 46 and the projection 52d is formed on the crawler guide 52 has been described. The receiving surface 46d may be formed on the crawler guide 52.
[0025]
As described above, when the crawler 34 travels, when traveling on a road surface with uneven portions or stepping on a stone or the like, an impact force due to a push-up acts on the swing arm 46 from the crawler 34 via the crawler guide 52 The thrust force at this time is applied not only to the fixed portion of the swing arm 46 and the crawler guide 52 by the bolt 50 but also to the contact portion between the swing arm 46 and the crawler guide 52, that is, the protrusion 52d and the receiving surface 46d. Since they act simultaneously, the impact force borne by the bolt 50 is reduced accordingly. For this reason, loosening of the bolt 50 due to the impact force at this time can be prevented.
[0026]
Further, as described above, since the swing arm 46 and the crawler guide 52 are in contact with the receiving surface 46d and the protrusion 52d, the crawler guide 52 is fastened to the swing arm 46 with the three bolts 50 and fixed. In this case, the bolt 50 can be inserted in a state where the contact surfaces are brought into contact with each other and the swing arm 46 and the crawler guide 52 can be fixed, so that the mounting work can be easily performed. it can.
[0027]
【The invention's effect】
As described above, according to the first aspect of the present invention, when traveling on the uneven part or stepping on a stone or the like, the impact force due to the thrust from the crawler is shared between the fixing member and the contact part. Since it can bear, the impact force which this fixing member bears becomes small, and the loosening of a fixing member, etc. can be prevented.
[0028]
Further, since the receiving surface and the projection formed corresponding to the swing arm and the guide member are brought into contact with each other, when the guide member is attached to the swing arm with the fixing member, the contact surface is contacted. Since the swing arm and the guide member can be fixed in a state where they are in contact with each other, the mounting operation can be facilitated.
[0029]
According to the second aspect of the present invention, since the swing arm can be used as it is without changing the shape of the conventional swing arm, the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a crawler tractor to which the present invention is applied.
FIG. 2 is an enlarged side view of the main part of the above.
FIG. 3 is a cross-sectional view of FIG. 2 viewed from the rear.
4 is a cross-sectional view of FIG. 2 viewed from the rear.
5A is a front view of the crawler guide, FIG. 5B is a top view thereof, and FIG. 5C is a side view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Tractor 14 Traveling frame 34 Crawler 40 Lower roller 46 Swing arm 46a Cylindrical part 46b Plate 46c Bearing part 46d Receiving surface 50 Bolt (fixing member)
52 Crawler guide (guide member)
52a Mounting portion 52b Upright portion 52c Guide portion 52d Projection portion 53 Hole

Claims (2)

A swing arm pivotally mounted on the traveling frame so as to be swingable back and forth, a pair of front and rear lower wheels each pivotally mounted on the swing arm, and a crawler that is in rolling contact with the pair of front and rear lower wheels; And a guide member fixed to a lower portion of the swing arm via a fixing member to prevent the crawler from coming off, a receiving surface and a protrusion on the front and rear of the swing arm. And forming either one of the receiving surface and the protruding portion corresponding to either the receiving surface or the protruding portion on the guide member,
With the guide member fixed to the swing arm, the swing arm and the guide member are brought into contact with each other via the receiving surface and the protrusion.
A crawler guide device. While fixing the guide member at a substantially central portion in the front and rear of the swing arm,
The receiving surfaces are respectively formed on the front and rear portions of the swing arm, and the protrusions are formed on the guide members corresponding to the receiving surfaces,
The crawler guide apparatus according to claim 1.

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