JP7155824B2 - Structural drive wheel structure for crawler tracks - Google Patents

Description

The present invention relates to a sprocket holding portion structure for a crawler track system.

2. Description of the Related Art Conventionally, a crawler track device provided in a construction machine or the like is known (see, for example, Patent Literature 1).

The crawler track device has a sprocket, is driven by a hydraulic motor, and is wound around a driving wheel located at the rear end, an idler wheel located at the front end, a roller, a driving wheel, an idler wheel, and a roller. and a track shoe configured to be annularly connected. The idler wheel is configured to be movable back and forth, and can adjust the tension of the track shoe plate wound in an annular shape.

JP 2004-217154 A

Since the sprocket and the sand raked up by the sprocket and the track shoe come into contact with the sprocket, the outer peripheral surface of the sprocket wears, damaging the bolt holes and exposing the fixing bolts that secure the main frame and the sprocket. There is a risk that it will be lost. Therefore, it is conceivable to increase the wear resistance by forming the outer wall of the driving wheel thicker, but there is a problem that the material cost of the driving wheel increases and the production cost increases.

SUMMARY OF THE INVENTION In view of the above points, it is an object of the present invention to provide a drive wheel structure for a crawler track device that can suppress an increase in production costs and improve wear resistance.

[1] In order to achieve the above object, the present invention
a track shoe plate connected in a ring;
a driving wheel for driving the track shoe;
A drive wheel structure for a crawler track system comprising:
The starting wheel is
a sprocket that meshes with the shoe plate;
a rotor that fixes the sprocket;
a fixed body that rotatably supports the rotating body and is fixed to the body frame;
with
The fixed body is provided with a flange projecting radially outward,
The flange is provided with a female-threaded bolt hole into which a bolt for fixing to the body frame is screwed,
The fixed body is configured such that the thickness of at least a part of the outer peripheral wall of the flange on the meshing region side where the crawler plate of the crawler track and the sprocket mesh is thickened.

According to the present invention, by configuring the flange of the stator so that the outer peripheral wall of the flange of the stator is thickened at least in part on the meshing region side, the flange of the stator is thickened over the entire circumference. The material cost can be suppressed as compared with the case of using meat, and the wear resistance of the meshing region, which is most easily worn, can be improved, and the wear resistance of the entire driving wheel can be improved.

[2] Further, in the present invention, the cross-sectional shape of the outer peripheral wall of the flange is symmetrical with respect to the advancing direction of the crawler track device in the meshing region side and the region opposite to the meshing region side. It is preferably configured in a shape.

According to such a configuration, since the flange of the fixed body has a front-rear symmetrical shape, it can be used for both the left and right drive wheels of the crawler track device. Therefore, there is no need to manufacture separate left and right driving wheels, and versatility is improved, and erroneous mounting of the right and left driving wheels to the vehicle body frame can be prevented.

[3] Further, in the present invention, the cross section of the outer peripheral wall of the flange on the meshing region side may be crescent-shaped.

According to this configuration, the engagement region side of the stator flange is formed in a crescent shape so that the thickness of at least a portion of the outer peripheral wall of the stator flange on the engagement region side is thickened . The material cost can be suppressed compared to the case where the wall is thickened over the entire circumference, and the wear resistance of the meshing region, which is most likely to wear, can be improved, and the wear resistance of the entire driving wheel can be improved. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a construction machine according to an embodiment using the drive wheel structure of the present invention; Explanatory drawing which shows the starting wheel of this embodiment from upper direction. FIG. 2 is an explanatory view showing the starting wheel of the embodiment from the vehicle body frame side; Explanatory drawing which shows the driving wheel of other embodiment of this invention.

With reference to the drawings, a construction machine as a vehicle body to which the drive wheel structure of the crawler track drive according to the embodiment of the present invention is applied will be described in detail as an example. As shown in FIG. 1, the construction machine 1 of the present embodiment is a hydraulic excavator, and includes a traveling body 3 having an endless track 2 and a revolving body 4 provided on the traveling body 3 so as to be able to turn. .

The revolving body 4 includes an operation room 5 provided on the front left side, and a machine room 6 provided adjacent to the rear of the operation room 5 . The machine room 6 is provided with a power source such as an electric motor or an internal combustion engine (not shown) and an oil pump driven by the power source. The construction machine 1 uses the hydraulic pressure output from the oil pump to drive the hydraulic motor, and uses the power output from the hydraulic motor to drive the endless track 2 of the traveling body 3 . The power source may be a diesel engine, a gasoline engine, or may utilize both an internal combustion engine and an electric motor.

A base end of a working machine 7 is connected to the front right side of the revolving body 4 so as to be located on the side of the operation room 5 and in front of the machine room 6 .

The work machine 7 includes a boom 8 whose base end is rotatably connected to the revolving body 4, an arm 9 whose base end is rotatably connected to the tip of the boom 8, and a tip of the arm 9 which rotates. and a bucket 10 to which the proximal end is freely connected. The tip of a rod 11a of a boom hydraulic cylinder extending from the revolving body 4 is connected to an intermediate portion of the boom 8, and the boom 8 rotates by advancing and retreating the rod 11a of the boom hydraulic cylinder. A tip end of a rod 12a of an arm hydraulic cylinder 12 extending from the boom 8 is connected to a base end of the arm 9, and the arm 9 rotates by moving the rod 12a of the arm hydraulic cylinder 12 forward and backward. A tip end of a rod 13a of a bucket hydraulic cylinder 13 extending from the arm 9 is connected to the base end of the bucket 10 via a link 14. By advancing and retreating the rod 13a of the bucket hydraulic cylinder 13, the bucket 10 is moved. Rotate.

The operation chamber 5 is provided with an operation unit (not shown) for an operator to operate the rotation of the working machine 7, the rotation of the revolving body 4, and the travel of the traveling body 3. FIG.

The endless track 2 has a sprocket 21a and is driven by a hydraulic motor. and a track shoe plate 27 configured to be annularly connected and wound around a wheel 25. - 特許庁The idler wheel 23 is configured to be movable back and forth, and can adjust the tension of the track shoe plate 27 wound in an annular shape.

FIG. 2 is a cross-sectional view schematically showing an enlarged main part of the driving wheel 21. As shown in FIG. The driving wheel 21 includes a bottomed cylindrical rotating body 31 to which a sprocket 21a (see FIG. 1) that meshes with the shoe plate 27 is connected, and rotatably supports the rotating body 31. and a fixed body 33 to be fixed. A hydraulic motor such as a swash plate type piston motor is provided inside the fixed body 33 . A reduction mechanism such as a planetary gear mechanism is provided inside the rotating body 31 to reduce the speed of the output rotation of the hydraulic motor and transmit it to the rotating body 31 . The fixed body 33 is provided with a flange 33a projecting radially outward, and the flange 33a is provided with a bolt hole 33b having an internal thread.

As shown in FIG. 3, a crescent-shaped thick portion 35 is provided on the flange 33a, which is the portion provided with the bolt holes, positioned in the meshing region where the sprocket 21a and the track shoe 27 mesh.

With this thick portion 35, the material cost can be reduced compared to the case where the fixed body is thickened over the entire circumference, and the wear resistance of the meshing region, which is the most susceptible to wear, can be improved. The wear resistance of the wheel 21 as a whole can also be improved.

In addition, the cross section of the outer peripheral wall of the flange 33a of the fixed body 33 has a crescent shape in the area opposite to the meshing area side, and the thick portion 35 is also arranged on the front side of the endless track 2, so that the direction of movement of the endless track 2 is increased. It has an elliptical shape that is symmetrical in the front-rear direction.

As a result, the fixed body 33 has a symmetrical elliptical shape, and can be used for either the left or right drive wheel 21 of the endless track 2 . Therefore, there is no need to manufacture separate left and right starting wheels, and versatility is improved, and erroneous mounting on the left and right sides of the endless track 2 can be prevented when mounting the starting wheels 21 to the vehicle body frame 41.例文帳に追加

[Other embodiments]
FIG. 4 shows a driving wheel 21 of another embodiment. As shown in FIG. 4, the thick portion 35 may be formed in a trapezoidal cross section so that the width in the left-right direction gradually narrows toward the outside in the radial direction. According to such a configuration, it is possible to further reduce material costs.

Further, in the present embodiment, the construction machine has been described as an example, but the vehicle body to which the drive wheel structure of the crawler track device of the present invention is applied is not limited to the construction machine, and may be another machine.

Further, in the present embodiment, the crescent-shaped thick portion 35 is provided in front and rear of the driving wheel 21 so as to be symmetrical in the front-rear direction and has an elliptical shape. The thickened portion 35 of the shape may be provided and the thickened portion on the front side may not be provided. According to the present invention, "the cost of materials can be suppressed and the wear resistance of the meshing region, which is most likely to be worn, can be improved" as compared with the case where the fixed body is thickened over the entire circumference. It is possible to obtain the effects of

Also, the thick portion 35 may be provided so as to correspond to the bolt hole 33b. The thick portion 35 may be formed integrally with the outer peripheral wall of the fixed body 33 , or an annular member separate from the fixed body 33 having the thick portion 35 may be press-fitted into the outer peripheral surface of the fixed body 33 . They may be integrated by fixing with bolts.

Further, the cross-sectional shape of the outer peripheral wall of the fixed body of the present invention on the meshing region side is not limited to the crescent shape, and it is sufficient that at least a part of the meshing region is formed thick. For example, it may have a triangular shape, a trapezoidal shape, or a plurality of continuous circular arc shapes. Further, the cross-sectional shape of the outer peripheral wall of the fixed body of the present invention on the meshing region side may be vertically asymmetrical.

Reference Signs List 1 construction machine 2 endless track 3 running body 4 rotating body 5 operation room 6 machine room 7 work machine 8 boom 9 arm 10 bucket 11a rod 12 arm hydraulic cylinder 12a rod 13 bucket hydraulic cylinder 13a rod 14 link 21 starting wheel 21a sprocket 23 idler wheel 25 wheel 27 shoe plate 31 rotating body 33 fixed body 33a flange 33b bolt hole 35 thick portion 41 body frame 43 fixing bolt

Claims (3)

a track shoe plate connected in a ring;
a driving wheel for driving the track shoe;
A drive wheel structure for a crawler track system comprising:
The starting wheel is
a sprocket that meshes with the shoe plate;
a rotor that fixes the sprocket;
a fixed body that rotatably supports the rotating body and is fixed to the body frame;
with
The fixed body is provided with a flange projecting radially outward,
The flange is provided with a female-threaded bolt hole into which a bolt for fixing to the body frame is screwed,
wherein the fixed body is configured such that the thickness of at least a portion of the outer peripheral wall of the flange on the meshing region side of the crawler plate and the sprocket of the endless track device is thickened. The drive wheel structure of the track system. A drive wheel structure for a crawler track device according to claim 1,
The cross-sectional shape of the outer peripheral wall of the flange is formed symmetrically with respect to the traveling direction of the crawler track device in the meshing region side and the region opposite to the meshing region side. The drive wheel structure of the track drive. A drive wheel structure for a crawler track device according to claim 1 or claim 2,
A drive wheel structure for a crawler track device, wherein a section of the outer peripheral wall of the flange on the meshing region side is crescent-shaped.

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