JPH0229025Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a traveling device consisting of a rubber crawler.

(b) Prior Art Conventionally, the drive sprocket of a traveling device consisting of a rubber crawler has a tooth bottom diameter of a single circular arc.

(c) Problems that the invention aims to solve Generally, the root diameter of the drive sprocket of a crawler is determined by the length of the crawler, the position of the core metal, etc. to determine the optimum diameter that will cause less wear on the drive sprocket and the core metal. If the length of the crawler or the pitch of the core metal is slightly different, a separate drive sprocket with a root diameter of only 1 to 3 mm is prepared and used, which is cumbersome to manage and significantly increases costs. There was a problem.

(d) Means for Solving the Problems The present invention provides a traveling device in which a rubber crawler is wound around a drive sprocket and an idler wheel, in which the front and rear tooth bottoms of each tooth bottom of the drive sprocket in the rotational direction are The radii of curvature are formed in the same order with a step of about 1 to 3 mm, and the tooth bottom diameters are two slightly different.The drive sprocket is made symmetrical on the front and back, and the drive sprocket is replaced with the front and back to form the axle. By attaching the roller to the roller, it is possible to apply the roller to two types of crawlers having slightly different crawler lengths or core metal pitches, thereby solving the above-mentioned problems.

(E) Function If the length of the crawler or the pitch of the core metal is a little short, as shown in Figure 2, move the drive sprocket so that the low part of the tooth bottom is located on the rear side in the direction of rotation, and then attach the drive sprocket to the axle. When the crawler core is installed in When it is installed upside down on the axle as shown in the figure, the high part of the tooth bottom is located on the rear side in the direction of rotation, and the crawler core metal engages with the high part of the tooth bottom and the tooth immediately after it and is driven. As a result, one type of drive sprocket can be applied to two types of crawlers.

(F) Example An example of the present invention will be explained with reference to the drawings.
In Figs. 1 to 4, reference numeral 1 denotes a machine base of a combine harvester or other working machine, and its traveling device is made up of a rubber crawler 2 wound around a drive sprocket 3 and an idler wheel 4, and the rubber crawler 2 is conventionally Similar to the above, core metals A are embedded at predetermined intervals, and engagement holes 6 are bored at regular intervals between the lugs 5, 5 at the center of the width, and the drive sprocket 3 is as shown in Fig. 1. As shown in b, it is configured in a left-right symmetrical shape and is attached to axles 8, 8 that protrude from the traveling mission 7 to both sides, and the track frame 9 has a large number of wheels that roll on the upper surface of the ground contact side of the crawler 2. 10... and a support wheel 11 that supports the return side, and a support rod 12 at the rear.
The idler wheel 4 is supported via a push rod 13.

Then, each tooth bottom 3a of the drive sprocket 3
has a stepped portion 3b of 1 to 3 mm in the middle portion in the front-rear direction, and the front and rear portions thereof are formed into a high portion 3c and a low portion 3d.

In the above-mentioned traveling device, if the length of the crawler or the pitch of the core metal is a little small, the drive sprocket 3 should be set so that the lower part 3d of the tooth bottom 3a is at the rear in the rotational direction, as shown in Fig. 2. Attach it to the axles 8, 8, attach the crawler 2, and install the drive sprocket 3.
When the machine is moved forward by rotating in the direction shown by the arrow, the core metal A of the crawler 2 moves along the trajectory a with respect to the drive sprocket 3 and touches the lower part 3d of the tooth bottom 3a of the drive sprocket 3 and the tooth immediately behind it. As the drive sprocket 3 rotates, the crawler 2
is driven.

When moving the machine backwards, the drive sprocket 3 rotates in the opposite direction, so the core metal A engages with the high part 3c of the tooth bottom 3a.However, during normal work, it is extremely rare to move the machine backwards compared to forward drive. , wear during reversing is practically negligible.

In addition, if the length of the crawler 2 or the pitch of the core metal A is slightly larger than that of the crawler 2 described above, if the drive sprocket 3 is attached to the axles 8, 8 upside down as shown in FIG. The high part 3c of 3a moves rearward and engages with the core metal A, and the crawler 2 can be driven appropriately so that it does not wear out.In this case, when the aircraft is moved backward, the core metal A Although it engages with the lower portion 3d, there is no problem for the same reason as mentioned above.

Next, to explain the detachment prevention device for the idler wheel 4, as shown in FIGS. 5 and 6, screw holes 4b are bored in the flanges 4a... Through holes 1 at regular number intervals
4... are bored, and the base of the plate 15... inserted into each through hole 14... is screwed onto the flange 4a... with bolts 16..., thereby forming the plate 15...
The tips of the... are made to protrude from the outer periphery of the drive sprocket 3 and are fitted into the meshing hole 6 of the crawler 2, so that even if the crawler 2 tilts relative to the idler wheel 4, it will not come off.

7 to 10 show another embodiment of the detachment prevention device, in which a disc 17 is loosely fitted to one side of the boss of the idler wheel 4, and a projection 18 on the outer periphery and a flange 4
A return spring 19 is stretched between the idler ring 4 and the base of the plate 15a, which is inserted into the through hole 14 of the idler wheel 4 (at an interval that is a positive multiple of the pitch of the core metal A), inside the disc 17. The support rod 12 is pushed out and the ninth
In the working condition set as shown in the figure, the plate 15 is separated from the rear end of the frame 9a integrated with the track frame 9, and the disc 17 is free.
The disc 17 is rotated clockwise by the tension of the return spring 19 so that the stopper 21 comes into contact with the flange 4a, and the plates 15a are in a radial protruding position, with their tips touching the engagement hole 6 of the crawler 2. It fits into the ... to prevent it from coming off.

When replacing the crawler 2, when the idler wheel 4 is pushed in as shown in FIG. 10, the oblique tip of the plate 15a located at the front comes into contact with the rear end surface of the frame 9a and is pushed. Therefore, disk 1
7 rotates against the return spring 19, and as a result, the plate 15a comes out of the engagement hole 6 of the crawler 2, allowing the crawler 2 to be easily hooked and removed.

(g) Effects of the invention As mentioned above, the present invention provides two types of crawlers with slightly different lengths of the drive sprocket 3 or spacing between the core metals A. By engaging the core metal A..., one drive sprocket 3 can be provided to two types of crawlers, making parts management easier and reducing the number of parts to significantly reduce costs. Can be done.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1a is a side view of the drive sprocket, b is a longitudinal cross-sectional view of the same as above, Figs. 2 and 3 are operational views when the drive sprocket is used upside down, Fig. 4 is a side view of the traveling device, Figures 5-6 show the crawler detachment prevention device, Figure 5 is a partially cutaway plan view, Figure 6 is a perspective view of the idler wheel, and Figures 7-10.
The figures show other examples of the crawler detachment prevention device.
9 is a perspective view of the idler wheel, FIG. 9 is a side view showing the working state, and FIG. 10 is a side view showing the state when the crawler is replaced. 1...Machine base, 2...Crawler, 3...Drive sprocket, 3a...Tooth bottom, 3b...Step part, 4...
Idler wheel, 5...lug, 6...meshing hole, 9...orbit frame, 12...support rod, 15...plate.

Claims (1)

[Scope of utility model registration request] In a traveling device in which a rubber crawler 2 is wound around a drive sprocket 3 and an idler wheel 4, the front and rear tooth bottoms in the rotational direction of each tooth bottom 3a of the drive sprocket 3 are arranged so that the radius of curvature thereof is approximately 1 to 1 in the same order. A running device characterized in that the drive sprocket 3 is formed with a step of about 3 mm and has two slightly different root diameters, and the drive sprocket 3 is symmetrical on the front and back.