JPH0556771U - Lower wheels of crawler running body - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the stability and running stability of the machine body and improve the load condition of the roller shaft. [Structure] A crawler traveling body which is rotatably fitted to a plurality of roller shafts 2 arranged below a crawler frame 1 via rolling bearings 6 and rotatably supports an endless crawler shoe 3. In the lower part of the wheel body 7, the length of the boss 5 and the length between the outer end portions of both rims 4 provided on both sides of the boss 5 are set to be substantially the same as the tread width 9 of the crawler shoe 3, and the boss 5 Rolling bearings 6 are provided near both ends of the rim to be fitted onto the roller shaft 2, and the outer tread surface 4a of the rim 4 located at a position distant from the center of the machine serves as a fall fulcrum, which is stability against the fall of the machine. In addition, the load condition of the roller shaft 2 is improved by bringing the fulcrum of the roller shaft 2 closer to the point of action of the load applied to the roller shaft 2.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a lower roller of a crawler traveling body.

[0002]

[Prior Art]

For example, as shown in FIG. 2, the lower wheels of a crawler traveling body of a construction machine such as a backhoe are arranged symmetrically parallel to each other from the center of the machine body and have a U-shaped cross section opened downward. The crawler frame a is rotatably fitted to a plurality of roller shafts b provided at predetermined intervals in the longitudinal direction of the crawler frame a through rolling bearings c, and the boss d ₁ of the rolling wheel body d. The tread surface e formed on the outer circumference of the web d ₂ provided at the center portion in the width direction is provided so as to coincide with the center of the crawler frame a in the width direction.

Then, the crawler shoe f rolls between two guided projections g provided on the back surface of the crawler shoe f at a position corresponding to the center of the crawler shoe f with a predetermined distance therebetween. Then, the crawler shoe f can be guided.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned lower wheels of the crawler traveling body are required to be miniaturized in construction machines such as backhoes, which are required to be miniaturized so as to be suitable when operating in a narrow space. If the space between the left and right crawler frames a is narrowed, the stability of the backhoe against falling is immediately reduced.

In addition, the traveling stability is poor due to the play between the protrusion g of the crawler shoe f and the tread surface e of the wheel body d, and the rolling bearing c fitted on the roller shaft b has a narrow interval, so There is a problem in that the strength of the la axis b is disadvantageous.

In view of the above-mentioned circumstances, the present invention forms the rim width and the boss length of the lower rolling wheel to be substantially the same as the width of the crawler shoe, and forms the treads at both ends in the width direction of the rim. The stability of the machine against overturning and the running stability can be improved, and the rolling bearings are installed near both ends of the boss to improve the load condition of the roller shaft. The purpose is to provide wheels.

[0007]

[Means for Solving the Problems]

 According to the present invention, the width of the boss is set to be substantially the same as the tread width of the crawler shoe, and both ends of the boss are supported by the roller shaft through bearings, and rims are provided on both sides of the boss. The length between the outer ends of both rims is substantially the same as the width of the boss, and the inner side of the opposite sides of both rims guides the guided projection of the crawler shoe.

[0008]

[Action]

 Therefore, according to the present invention, the outer tread surface of the lower wheel that is distant from the center of the machine serves as a fall fulcrum to improve the stability of the machine against a fall, and the fulcrum of the roller shaft and the roller shaft. The point of action of the load approaches to improve the load condition of the roller shaft.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a lower roller of a crawler traveling body according to the present invention. In FIG. 1, 1 has a U-shaped cross section that is opened downward, and a roller main body 7 described later. A crawler frame 2 having an inner surface space adapted to the width is a plurality of roller shafts arranged at a lower portion of the crawler frame 1 at predetermined intervals in the longitudinal direction of the crawler frame 1. Reference numeral 3 denotes a crawler shoe which is rotated by being guided by a wheel body 7 which will be described later. The crawler shoe 3 has a predetermined interval on its back surface at a position symmetrical with respect to the center of the crawler shoe 3 in the width direction. It has two guided projections 3a provided to be placed.

The crawler shoe 3 has a shaft hole 5a having a width substantially the same as the tread width (B shown in FIG. 1) and penetrating in the longitudinal direction, and a predetermined distance is provided near both ends of the shaft hole 5a. A rolling wheel main body 7 having a boss 5 having a rolling bearing 6 arranged at a distance and rims 4 provided on both sides of the boss 5 is provided, and the rolling wheel main body 7 is provided on the roller shaft 2 as described above. It is rotatably fitted over the rolling bearing 6.

The rim 4 is provided with a tread surface 4a having a predetermined width, and the length between the outer end portions of the tread surfaces 4a, 4a of the rims 4, 4 on both sides is substantially the same as the width of the boss 5, and The opposing inner parts 4b, 4b of both rims 4, 4 guide the outer surfaces of the protrusions 3a, 3a of the crawler shoe 3.

When the machine body is about to fall, the tread surface 4a on the outer side of the wheel body 7 located at a position farther from the center of the machine body than the center in the width direction of the crawler frame 1 serves as a fall fulcrum.

Further, the load applied to the rolling wheel main body 7 acts on the crawler frame 1 which is a fulcrum of the roller shaft 2 near the rolling bearing 6 via the rolling bearing 6.

According to the lower rolling wheels of the crawler traveling body of the present embodiment, the tread surface 4a on the outer side of the rolling wheel body 7 located at a position farther from the center of the machine body than the center in the width direction of the crawl frame 1 serves as the falling fulcrum. Therefore, the stability against tipping over of the aircraft is improved compared to the conventional aircraft of the same type.

Further, since the fulcrum of the roller shaft 2 and the point of action of the load applied to the roller shaft 2 come close to each other, the load condition of the roller shaft 2 is improved.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0018]

[Effect of the device]

 According to the lower roller of the crawler traveling body of the present invention, various excellent effects as described below can be obtained.

I) A lower roller having a length substantially the same as the tread width of the crawler shoe is provided between the outer ends of both rims, and when the machine body is about to fall, the center of the machine direction in the crawler frame width direction Since the tread surface on the outer side of the lower rolling wheel, which is located farther away, serves as the fall fulcrum, the stability of the fuselage against tipping is improved compared to the conventional aircraft of the same type.

II) Since the bearing of the lower roller is installed close to the crawler frame which is the fulcrum of the roller shaft, the fulcrum of the roller shaft and the point of action of the load applied to the roller shaft are close to each other, and the load condition of the roller shaft is Can be improved.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a lower roller of a crawler traveling body according to the present invention.

FIG. 2 is a sectional view schematically showing an example of a lower roller of a conventional crawler traveling body.

[Explanation of symbols]

 1 crawler frame 2 roller shaft 3 crawler shoe 3a protrusion 4 rim 4a tread surface 4b inner part 5 boss 6 rolling bearing 7 roller body B crawler shoe tread width

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Fujishita 3174 Showa-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Ishi Kawashima Construction Machinery Co., Ltd. Yokohama factory

Claims (1)

[Scope of utility model registration request] 1. The width of the boss is set to be substantially the same as the width of the tread surface of the crawler shoe, and both ends of the boss are supported by roller shafts through bearings, and rims are provided on both sides of the boss. The length between the outer ends of both rims is made substantially the same as the width of the boss, and the inner facing parts of both rims are configured to guide the guided projections of the crawler shoes. ring.