JPH0216946Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a crawler track suitable for a tractor, and more specifically to a track suitable for use in wetlands and the like.

[Conventional technology]

Generally, a tractor is equipped with tracks as a traveling means. This crawler track includes a track chain configured by connecting a plurality of links in an endless manner so as to be able to rotate freely, and a shoe attached to each link of the track chain. Shoes attached to the links include wetland shoes, which come in various forms depending on where the tractor is used.

For example, the wetland shoe disclosed in Japanese Patent Publication No. 56-45830 has a contact surface with a front inclined surface and a rear inclined surface starting from the front end and the rear end respectively and converging toward a common top. The apex forms an arc extending forward and backward of the shoe between the ends of the shoe in the longitudinal direction, and the outer end portion of the arcuate top is located at the front of the shoe, and the center portion of the arcuate top is located at the rear of the shoe. has been done.

This shoe for wetlands has the following properties: (a) unit load can be reduced, (b) traction force when moving forward is large, (c) sideslip is less likely to occur, (d) adhered soil easily falls off, and (e) stable. It has features such as being able to ground easily, and is currently in widespread practical use.

[The problem that the idea attempts to solve]

However, when each shoe is attached to each link of the truck chain, there is a gap between the front end of one shoe and the rear end of the next shoe.
There is a gap in the front and back direction. As a result, mud enters the track chain side through the gaps, causing
The tractor tends to sink into the wetland, making it difficult to work in the wetland. In addition, there were problems that needed to be solved, such as mud being kneaded between adjacent sheds, making it difficult for mud adhering to the sheds to fall off.

[The problem that the idea attempts to solve]

This invention was made based on the above-mentioned facts, and its main purpose is to solve the above problems, to make it possible for the tractor to be difficult to sink even in wetlands, and to be able to easily work in wetlands. An object of the present invention is to provide an improved track.

[Means for solving ideas]

In order to achieve the above main object, the present invention includes an endless track chain configured by mutually connecting a plurality of links in a freely rotating manner, and each of the links has a mounting plane. and a ground plane are mounted in the mounting plane with the ground plane down, each shoe having a front end adjacent to the rear end of the adjacent shoe. The ground plane of the shoe includes a front inclined surface and a rear inclined surface starting from a front end and a rear end, respectively, and converging toward a common top, and the common top has a front and back slope. In a crawler track that extends across both ends of the shoe in the longitudinal direction, the length of the shoe in the front-rear direction on the ground contact surface is such that the rear end is located at the central portion of the shoe in the longitudinal direction and extends rearward from both ends. and the height of the rear end from the mounting plane at the central portion is greater than the height of the front end from the mounting plane at the central portion, and each of the shoes The front end of the central portion of one shoe and the rear end of the central portion of the adjacent shoe are arranged so as to substantially match or overlap in the front-rear direction when attached to the link; A crawler track is provided which is characterized by:

〔Example〕

Hereinafter, one embodiment of a tractor track improved according to this invention will be described with reference to the accompanying drawings.

In FIG. 1, the crawler track 2 includes an endless track chain 4. Truck chain 4 is
It is constructed by connecting a plurality of links 6 to each other in an endless manner via pin members 8 so as to be freely pivotable. This truck chain 4 is wound between a driving sprocket and a driven sprocket (none of which are shown) provided at the rear end and front end in the longitudinal direction of the tractor, and a portion located below between both sprockets. is the ground running side of the track chain 4 (the part shown in FIG. 1 shows a part of the ground running side of the track chain 4).

On the other hand, a roller 12 is rotatably mounted on a frame (not shown) of the tractor via a shaft member 10. The rollers 12 support the weight of the tractor itself. These rollers 12 are driven on the rail surface of the track chain 4.

A shoe 14 is attached to each link 6 constituting the above-mentioned track chain 4. Each shoe 14 has substantially the same shape, and the structure thereof will first be described with reference to FIG. 1, as well as FIGS. 2 and 3.

The illustrated shoe 14 has a front wall 16, a rear wall 1
8, it has a right end wall 20 and a left end wall 22. The wall surface of the front side wall 16 defines a front inclined surface that extends inwardly from the front end 17 in the front-rear direction. Further, the wall surface of the rear side wall 18 defines a rear inclined surface that extends inwardly from the rear end 19 in the front-rear direction. Each of the above inclined surfaces converges on a common apex 24.

Further, the wall surface of the right end wall 20 defines a right inclined surface that starts from the right end in the left-right direction and extends inwardly at a somewhat inclined angle. Further, the wall surface of the left end wall 22 defines a left inclined surface that starts from the left end in the left-right direction and extends inwardly at a somewhat inclined angle. These left and right inclined surfaces define both ends of the shoe 14.

As can be understood from FIG. 1, the shoe 14 having such a configuration has a substantially triangular shape when viewed from the side (in cross-section), and one side (base) thereof is connected to the link 6 of the track chain 4. It is a mounting plane 15, and the other two sides are a front inclined surface and a rear inclined surface. The ground plane of the shoe 14 is defined by the front inclined surface and the rear inclined surface mainly including the common apex 24 . The triangular interior of the shoe 14 is
As shown in FIGS. 3 and 5, a hollow part is formed, and inside this hollow part, as shown in FIGS.
As shown in the figure, reinforcing ribs 2 are placed at appropriate intervals in the left-right direction, that is, in the longitudinal direction of the shoe 14.
6 is provided.

As shown in FIG. 2, the common top portion 24 extends across both ends of the shoe 14 in the longitudinal direction.
This common top portion 24 has a longitudinally intermediate portion.
It has a central portion 28a that extends substantially linearly in the longitudinal direction. This central portion 28a is arranged near the rear of the shoe 14 in the front-rear direction. Additionally, the outer end portions 28b and 2 of the common top portion 24
8c (right end portion 28b and left end portion 28c),
As will be described later, it is disposed near the front of the shoe 14 in the front-rear direction. Furthermore, the right side portion 28d of the common top portion 24 extends substantially linearly from one end of the center portion 28a toward the right end portion 28b, and the left side portion 28e extends substantially linearly from the other end of the center portion 28a toward the left end portion 28c. It extends substantially in a straight line.

As is clear from the above description, the cross-sectional shape of the shoe 14 is substantially triangular with the common apex 24 as the apex.

In the central portion 28a of the common top portion 24, as shown in FIGS. 1 and 4 to 6, the front inclined surface (the wall surface of the front side wall 16)
7 and slopes relatively gently in a straight line toward the central portion 28a. Further, the rear inclined surface (the wall surface of the rear side wall 18) is linearly inclined relatively largely starting from the rear end 19 of the shoe 14 toward the central portion 28a. That is, in the central portion 28a of the common top portion 24, the angle of inclination of the rear inclined surface with respect to the attachment plane 15 is configured to be larger (the inclination is steeper) than the angle of inclination of the front inclined surface with respect to the attachment plane 15.

In the outer end portions 28b and 28c of the common top portion 24, as shown in FIGS. 1 and 4, the front inclined surface starts from the front end 17 of the shoe 14 and extends in a straight line toward the outer end portions 28b and 28c. It has a relatively large slope. Further, the rear inclined surface starts from the rear end 19 of the shoe 14 and slopes relatively gently in a straight line toward the outer end portions 28b and 28c.

That is, in the outer end portions 28b and 28c of the common top portion 24, contrary to the case in the central portion 28a of the common top portion 24, the angle of inclination of the rear inclined surface with respect to the mounting plane 15 is as follows:
The angle of inclination is larger than the angle of inclination with respect to the mounting plane 15 (the inclination is steeper). Therefore, the angle of inclination of the front inclined surface and the rear inclined surface gradually changes between the central portion 28a and each of the outer end portions 28b and 28c.

The planar shape of the ground plane of the shoe 14 is the second
As shown in the figure, it has a substantially rectangular shape that is long in the left-right direction. The side shapes of the right end wall 20 and the left end wall 22 are substantially the same laterally symmetrical shape. That is, the lengths of both end wall portions of the shoe 14 in the front-rear direction are substantially equal. The two-dot chain line C in FIG. It shows a part of the center line (bisector) C connecting the centers of The lengths of both end wall portions in the front-rear direction have the same length 1 in the front-rear direction from the center line C thereof. The length of both end wall portions in the front-rear direction is therefore 1+1=21.

The front end 17 of the shoe 14 is substantially parallel to the center line C and extends linearly between the end walls. That is, the length from the center line C of the shoe 14 to the front end 17 has substantially the same length 1 between both end walls.

The rear end 19 of the shoe 14 is located at the length 1 from the center line C at both end wall portions thereof. However, the rear end 19 of the longitudinal center portion of the shoe 14 (corresponding to the center portion 28a of the common top portion 24 in the specific example) is located at a length 2 from the center line C. Length 2 is slightly longer than length 1, ie, length 3. Therefore, it has a length of 2=1+3. The length 2 at this central part is
substantially the same over its longitudinal direction and substantially parallel to the centerline C, but decreasing continuously from both ends of the central section to the end wall sections, at which the length increases. The length 1 is shorter by 3
becomes.

The above is the planar configuration of the ground plane of the shoe 14. In other words, the shoe 1
The length in the front-rear direction on the ground contact surface of No. 4 is from the rear end 19
is the central portion in the longitudinal direction of the shoe 14, and is formed longer rearward than both ends thereof (projects rearward).

Note that the central portion 28a of the common top portion 24 is
As shown in the figure, it is located somewhat closer to the rear end 19 than the centerline C and extends substantially parallel to the centerline C in the longitudinal direction.

On the other hand, in relation to the shape described above, the height of the rear end 19 from the mounting plane 15 in the central part is
Attachment plane 15 in the central part of the front end 17
It is formed higher than the height of the this,
This will be explained in detail with reference to FIG.

First, the rear end 19 of the shoe 14 will be explained.
Attachment plane 15 in the central part of the rear end 19
The height h1 from the rear end 19 is slightly higher than the height h2 from the mounting plane 15 at both longitudinal ends of the shoe 14, that is, by h3 (h1=h2+h3). Therefore, the rear end 19
The height from the mounting plane 15 is configured to change continuously so that it gradually increases by h3 from both ends toward the center.

Next, the front end 17 of the shoe 14 will be explained.
The height h4 of the front end 17 from the mounting plane 15 is:
The shoe 14 is substantially the same across both ends including the central longitudinal portion. Also, this front end 17
The height h4 is the height of the rear end 19 from the mounting plane 15 at both longitudinal ends of the shoe 14.
It is substantially the same as h2.

From the above, the height h1 of the rear end 19 from the mounting plane 15 at the central portion is equal to
is formed higher by h3 than the height h4 from the mounting plane 15 at the central portion.

Similarly, in FIG. 4, the height H1 of the central portion 28a of the common top portion 24 from the mounting plane 15 is:
The height H2 is higher than that of the outer end portions 28b and 28c. Therefore, the height of the common top 24 from the mounting plane 15 is the same as that of both ends 28b and 2.
From 8c towards the central part 28a, gradually H1
It is configured to change continuously so that it becomes higher by −H2.

As shown in FIGS. 2, 3, and 6, a pair of mounting through holes 30 are provided at intervals in the front-rear direction in a pair of reinforcing ribs 26 located at the longitudinal center of the shoe 14. is formed.
A recess 32 is formed in the opening of each through hole 30 on the ground surface side. The surface of the rib 26 opposite to the ground surface, including the opening of each through hole 30, constitutes the mounting plane 15.

The shoe 14 constructed as described above is attached to each link 6 of the track chain 4 at its attachment plane 15 with its ground plane facing down, as shown in FIG. That is, mounting plane 1
5 is brought into contact with the corresponding mounting surface of each link 6, and a bolt 34 is passed through the mounting through hole 30 of the shoe 14 and the corresponding mounting hole (not shown) provided in each link 6, and the tip thereof The nut 36 is tightened to fix the shoe 14 to each link 6. As can be seen from FIGS. 1 and 6, the head of the bolt 34 is accommodated in a recess 32 provided on the ground surface side of the shoe 14.

The shoes 14 are sequentially arranged in the front-rear direction so that the front end 17 of one shoe 14 is located adjacent to the rear end 19 of the adjacent shoe 14 in the above-described attached state. Each shoe 14 is, of course, attached to each link 6 so that its longitudinal direction is orthogonal to the direction of movement of the tractor chain 4, ie, the direction of travel of the tractor.

In each of the shoes 14, the front end 17 of one shoe 14 in the center portion and the rear end 19 of the other shoe 14 located adjacent to the center portion substantially coincide with each other in the front-rear direction. Or, their attachment positions in the front and back directions are determined so that they overlap. As mentioned above, the height h1 of the rear end 19 from the mounting plane 15 at the center portion is as follows.
Attachment plane 15 in the central part of the front end 17
This is achieved because the height h4 is higher than the height h4.

In FIG. 1, when the ground running side of the tractor chain 4 is moved in the direction indicated by arrow 38, the tractor moves forward in the opposite direction of arrow 38. In this case, the rear side wall 18 side becomes the forward movement surface. Conversely, if the ground running side of the track chain 4 is
When moved in the direction indicated by 0, the tractor will move in the direction indicated by arrow 4.
Move forward in the opposite direction of 0. In this case, the front wall 16
The side becomes the reversing action surface.

When the tractor moves forward and backward, each shoe 14
The mounting position in the front-rear direction is such that the front end 17 of the center portion of the shoe 14 and the rear end 19 of the center portion of the other shoe 14 located adjacent thereto substantially coincide with or overlap in the front-rear direction. is determined, the intrusion of mud from between the front and rear ends of each shoe 14 to the track chain 4 side is significantly reduced. Furthermore, the movement of each shovel 14 significantly reduces the amount of mud being kneaded.

[Effect of idea]

According to this invention described above based on one embodiment, the following effects can be obtained.

(1) Since the intrusion of mud from between the front and rear ends of each shoe to the tractor chain side is significantly reduced, the tractor is less likely to sink into the wetland, and workability in the wetland is significantly improved.

(2) The movement of each shoe greatly reduces the amount of mud being kneaded, making it easier for mud adhering to the ground surface of the shoe to fall off.

(3) The front and rear ends of each shoe have different heights from the mounting plane at the center, and they substantially coincide or overlap in the front and rear direction, so there is no interference between adjacent shoes. It can definitely be prevented. Furthermore, even if a foreign object such as a pebble gets caught between adjacent shoes, it can be easily removed.

Although this invention has been described above in detail based on embodiments, this invention is not limited to the above-mentioned embodiments, and various modifications and modifications can be made within the scope of this invention.

[Brief explanation of drawings]

FIG. 1 is a side view showing a part of a tractor equipped with an embodiment of a crawler track constructed according to this invention. 2 is a plan view showing an enlarged view of the shoe in the crawler track shown in FIG. 1; FIG. FIG. 3 is a bottom view of the shoe shown in FIG. 2. FIG. 4 is a right side view of the shoe shown in FIG. 2. FIG. 5 is a sectional view taken along the - arrow in FIG. 2. FIG. 6 is a sectional view taken along the - arrow in FIG. 2. 2...Tractor crawler track, 4...Tractor chain, 6...Link, 14...Show, 15...Mounting plane, 16...Front side wall, 17...Front end, 1
8... Rear side wall, 19... Rear end, 20... Right side wall,
22... Left wall, 24... Common top, C... Center line.

Claims (1)

[Scope of utility model registration request] It includes an endless track chain configured by mutually pivotally connecting a plurality of links, each of which has a shoe of substantially the same shape including a mounting plane and a ground plane. , mounted in the mounting plane with the ground plane facing down, each of the shoes being arranged in a sequential longitudinal direction such that the front end of one shoe is located adjacent to the rear end of the adjacent shoe; The ground plane includes a front inclined surface and a rear inclined surface that originate from the front end and the rear end, respectively, and converge toward a common top, and the common top extends across both ends of the shoe in the longitudinal direction. In the crawler track, the length of the shoe in the front-rear direction on the ground contact surface is such that the rear end is formed longer rearward than both ends at the longitudinal center portion of the shoe, and The height from the mounting plane is greater than the height from the mounting plane at the central portion of the front end, and each of the shoes has a height above the front end at the central portion of the one shoe and the adjacent shoe. and the rear end of the central portion of the track are arranged so as to substantially match or overlap in the front-rear direction when attached to the link.