JPH0623511Y2 - Roller track arrangement structure of endless track device - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to the rolling of a crawler track device in a work vehicle having a traveling device around which rubber crawlers are wound, such as a combine harvester, a harvester, and other vehicles for traveling on uneven terrain. The present invention relates to a wheel arrangement structure.

<Prior Art> In the above-described crawler track device, generally, as shown in FIG. 2, a plurality of rolling wheels 6 inscribed on the ground-side inner peripheral surface of the crawler 4 correspond to the core metal 8 of the crawler 4. When inscribed on the outer peripheral lug 9 and when inscribed between the lugs 9,
Due to the deflection of the crawlers between them, the rolling wheels 6 themselves ascend / descend to the maximum height H, and this ascending / descending causes vibration or rolling or pitching during traveling of the machine body.

Conventionally, as a structure for preventing the body vibration during traveling by the crawler of the above-mentioned endless track device, it has been disclosed in Japanese Utility Model Publication No. 55-51661.
As shown in the publication, the pitch between shafts of a large number of rolling wheels pivotally supported on the fuselage side is set in relation to the pitch of the core bar of the crawler and the lugs. ) And lugs (valleys) are alternately arranged so that the wheels are arranged.

<Problems to be Solved by the Invention> In the above-mentioned conventional technique, when a certain rolling wheel is located between the lugs (valleys) of the crawler and is in a position to be lowered, another neighboring rolling wheel is raised. To be on the lugs and cores,
Although the amount of machine vibration due to the lifting and lowering of the rolling wheels decreases, at the same time, the rolling wheels that ride on the lag that occur as a phenomenon in the opposite direction reach the valley and the rolling wheels inscribed in the valley reach the lugs.
Since the wheel itself descends as a whole, the amount of vertical movement as a whole is reduced to about half. Further, in the above-mentioned rolling wheel arrangement, when the rolling wheels are pressed against the crawler most strongly and the vehicle is mainly supported at that point, the crawler grounding is supported at a fulcrum like a seesaw under the weight of the machine body where the vehicle weight acts the most. Therefore, there remains a problem that the aircraft pitching becomes large.

<Means for Solving Problems> In the present invention for solving the above problems, a traveling device that supports an airframe is provided between a plurality of wheels, and lugs 9 are projected on the outer periphery at a constant pitch P. In order to maintain the crawler ground by winding the crawler 4 wound around the crawler 4 and contacting the inner peripheral surface of the crawler 4 with 5 or more rolling wheels 6 axially supported on the machine side. With reference to the perpendicular line Q, the total number of the above-mentioned rolling wheels 6 is 3 or more n and the remaining plural m.
The front and rear rolling wheel groups N and M, each of which is composed of one rolling wheel, are arranged so as to be distributed, and the pitch L between adjacent rolling wheels between the rolling wheel groups N and M is configured to be wider than the pitch between other rolling wheels. Each wheel group N, M
The pitch between the inner wheel shafts is set to an integral multiple of the lug pitch P, and in the wheel group N, 1 / n to (n
-1) / n, 1 / m to (m-
It is characterized in that the length is set to a value obtained by adding a fractional lag pitch length obtained by multiplying any one of 1) / m.

<Operation> The weight of the machine is always grounded and supported at the two positions of the front and rear rolling wheel groups N and M. In each rolling wheel group N and M, 3 or more (n) or 2 or more (m) rolling wheels are used. 6 inscribes in the crawler 4 and rolls at positions regularly displaced from each other with respect to the position of the lug 9. As a result, in each of the rolling wheel groups, the respective rolling wheel ascending / descending loci overlap with each other in a phase slightly displaced from the lug pitch P by a quantitative ratio, and the vehicle body descends by one of the rolling wheels 6 having a small descending amount. Due to the regulation, the amount of lowering of the vehicle body on each of the wheels N and M is significantly reduced, and stable traveling of the vehicle body is ensured.

<Embodiment> The embodiment shown in FIGS. 1 and 2 will be described in detail below.
FIG. 1 shows a first embodiment of the present invention, in which a crawler type traveling device 1 is attached to the lower left and right sides of an airframe (not shown), and includes a drive wheel 2 and an idler wheel 3 that are axially supported on the front and rear of the airframe. An endless rubber crawler 4 is wound between the pair of wheels.

In the loop of the crawler 4, a traveling frame 5 fixed in the machine body in the front-rear direction is located. Five or more rolling wheels 6 are pivotally supported on the traveling frame 5, and each rolling wheel 6 forms a pair. None, it is distributed right and left from the center of the inner circumference of the crawler 4 and is inscribed in the crawler 4, and supports the machine body on the ground contact surface via the crawler 4. Reference numeral 7 is a supporting roller that supports the upper side of the crawler 4. As described above with reference to FIG. 2, the crawler 4 is internally provided with a large number of cored bars 8 at a constant pitch P.
Are buried in the inner peripheral surface of the core metal, and a part of the inner peripheral surface protrudes toward the inner circumference. Lugs 9 are projected on the outer peripheral surface at the same pitch P corresponding to the core metal 8. A sprocket engaging hole 10 is formed in the center between the cored bars 8.

Now, assuming that the aircraft is in a horizontal alignment state, centering on a perpendicular line Q descending from the center of gravity G of the machine, five rolling wheels 6a to 6e and a front rolling wheel group N consisting of three rolling wheels and two rolling wheels 6a to 6e. It is divided into a rear rolling wheel group M including rolling wheels and axially supported, and an inter-shaft pitch L between adjacent rolling wheels 6c and 6d between front and rear rolling wheel groups N and M is set to a pitch X of another rolling wheel shaft. It is set longer than ₁ , X ₂ , and Y. The reason why the inter-axle pitch L is made wider than the others is to have a structure in which the weight of the machine body is necessarily dispersed and supported at two or more points of the front and rear rolling wheel groups N and M.

Here, there are three rolling wheels 6a to 6c in the front rolling wheel group N, and among these inter-axis pitches X ₁ and X ₂ , X ₁ is an integer (A = 2) times the lag pitch P. Length and lug pitch P
Is set to a length obtained by multiplying by 2 with the length obtained by multiplying the number of rolling wheels in the rolling wheel group N (n = 3) by 2 and expressed by a mathematical expression, X ₁ = P × A + P × (2 / n) = P {A + (2 / n)} = P (2 + 2/3) ... (1).

Similarly, X ₂ is a length that is an integer (A = 2) times the lag pitch P, and a length that is a fraction obtained by multiplying the lug pitch P by “1/1 of the number of rolling wheels (n = 3) in the rolling wheel group N”. It is set to a different length, and here there is a fraction P × 1 / n (= 1/3) at the front and back, so X ₂ = P × A + P × (1 / n) + P × (1 / n) = P It is represented by (A + 2 / n) = P (2 + 2/3) (2), and X ₂ = X ₁ .

That is, assuming that the number of wheels in the front wheel group N is n, (n-1)
Each of the inter-axis pitches X ₁ , X ₂ , ... X _n-1 is a basic length that is a multiple of the lug pitch P (P × A in this example).
And the length of the fraction obtained by multiplying the lag pitch P by each term of 1 / n, 2 / n (n-1) / n is added.

Similarly, if the number of wheels of the rear wheel group M is m, then (n-
1) Each of the inter-axis pitches Y ₁ , Y _2, ..., Y _m-1 is a multiple of the lug pitch P, which is a basic length P × integer (A ′).
And the length of the fraction obtained by multiplying the lag pitch P by each term of the series of 1 / m, 2 / m (m-1 / m).

However, in the example shown in FIG. 1, since A '= 2, m = 2, the inter-axis pitch Y between the wheels 6d, 6e is Y = P * A' + P (b + 1 / m) = P (2 + 1/2) ... ・ (3).

As described above, the inter-axis pitches X ₁ , X ₂ ... X _n-1 and Y ₁ , Y ₂ · in the front wheel group N and the rear wheel group M, respectively.
・ ・ ・ Y _m-1 is defined, and within each roller group, each roller has a different positional relationship with the crawler lug 9 such as a "mountain" or a "valley" having a series deviation. And the weight of the machine during running is always supported at two points, the front wheel group N and the rear wheel group M, and the seesaw-like support state of the machine body due to one point contact with the ground may occur. Absent.

FIG. 3 is an explanatory view showing the axis of the rolling wheels in the front rolling wheel group N in FIG. 1 and the up-and-down state of the machine body, and the rolling wheels 6a to 6c are shown in the figure.
When the ascending / descending loci of the shaft center are indicated by a to c, the maximum ascending / descending width of the shaft centers of the respective rolling wheels 6a to 6c is H.

However, ascending / descending of each of the wheels 6a-6c is 1 / one of the lug pitch 9
In order to operate simultaneously while causing positional and temporal deviations by a fixed regular amount such as 3, 2/3, lifting and lowering in front of the machine supported by the rolling wheel group N is performed by each rolling wheel 6a- Within the range of the height δ between the apex of the ascending / descending trajectories ac of the axis 6c and the intersections of the ascending / descending trajectories ac, according to FIG. 3, the actual ascending / descending width is the maximum ascending / descending width. It is reduced to about 1/6. These reduction widths are not necessarily the same in all cases depending on the shape and material of the crawler, road surface conditions and the like.

The above-mentioned vertical reduction width increases as the number of wheels increases, and conversely the vertical movement amount decreases. Further, since the weight of the machine body is always supported by two points of the rolling wheel groups N and M, the actual vibration, rolling and pitching amount of the entire machine body become smaller than that when the front and rear rolling wheel groups are not divided. .

FIGS. 4 and 5 show examples in which the traveling device 1 on one side of the machine body has six and seven rolling wheels 6, and the number of rolling wheels n, m of the front and rear rolling wheel groups N, M is shown. Are three and three and four and three, respectively. In these cases, the number of rolling wheels is larger than that shown in FIG. As the ascending / descending trajectories overlap more in the same traveling range (see FIG. 3), the amount of ascending / descending of the machine body is further reduced.

Particularly in FIG. 5, the rolling wheels 6a and 6e at the front ends of the rolling wheel groups N and M are shown.
The distance between the shafts of the rear wheels 6a to 6e and 6f to 6g with reference to is a constant variation corresponding to the number of wheels in each group, and A to E are all arbitrary integers. is there. The change in the pitch between the shafts in each wheel group N, M always changes in order, such as 1 / nP, 2 / nP, 3 / nP, ... No need.

FIG. 6 shows an example of the structure of the crawler 4, and in this example, the lug 9 is raised toward the inside of the body (close to the center position) so that the upper side of the crawler 4 forms an inclined surface toward the outside of the body. In addition to providing a slope, the lugs 9 near the center position are alternately inclined in the front-rear direction, and a continuous (or discontinuous) weir 9a is provided between the inner ends of the lugs 9.

This structure promotes the discharge of soil and stones lifted by the crawler to the outside of the fuselage, and also allows the crawler 4 to move when traveling on the road.
There is an advantage that the inner end is grounded and the grounding width is reduced, and the turning radius can be reduced.

<Effects of the Invention> According to the present invention configured as described above, since the entire grounding wheel of the endless track device is divided into the front and rear wheel groups based on the vertical line (vertical line) from the center of gravity, the body weight is reduced. The front and rear wheel groups always contact the ground at two points (four points on the left and right), and the vertical vibration amount of the entire machine body during traveling of the machine body is reduced by being divided into the front and rear.

Furthermore, since the inscribed inside of the crawler of the rolling wheels of each rolling wheel group is different from the lug position by a series that is different from the lug position in series, the amount of vibration and rolling and pitching of the machine body due to the lifting and lowering of the rolling wheels during running The amount of will also decrease. As a result, the amount of vertical movement of the fuselage is significantly reduced synergistically due to the fact that the rolling wheel group is divided into front and rear and the shift configuration of the axial pitch in the front and rear rolling wheel groups due to the fractional pitch. There is an advantage that traveling can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of a rolling wheel arrangement showing a first embodiment of the present invention,
FIG. 2 is an explanatory view showing the principle of lifting and lowering of a wheel, FIG. 3 is an explanatory view showing a combined hoisting state of a plurality of wheel shafts, and FIGS. 4 and 5 are second and third embodiments of the present invention. 6A and 6B are a sectional view and an outer peripheral view showing an example of a crawler. 4: Crawler, 6: Rolling wheel 9: Lug, G: Center of gravity L: Pitch between shafts, M, N: Rolling wheel group m, n: Number of rolling wheels, P: Lug pitch Q: Vertical line X _{1 to} X ₃ , Y, Y ₁ , Y ₂ : Pitch between axes

Claims (1)

[Scope of utility model registration request] 1. A crawler (4) having a lug (9) projecting at a constant pitch (P) around an outer periphery of a traveling device for supporting an airframe is wound around a plurality of wheels, and the crawler (4) is grounded. In the structure in which five or more rolling wheels (6) axially supported on the fuselage side are inscribed on the side inner peripheral surface to maintain the crawler ground contact, the vertical line (Q) from the body weight center is used as a reference. The entire rolling wheels (6) are arranged to be divided into front and rear rolling wheel groups (N) and (M) each consisting of three or more n rolling wheels and the remaining plural rolling wheels (M). The inter-shaft pitch (L) of adjacent rolling wheels between (N) and (M) is configured to be wider than the other inter-shaft pitch, and the inter-roller shafts in the front and rear rolling wheel groups (N) and (M) are spaced from each other. The pitch is set to an integer multiple of the lug pitch (P), and in the wheel group (N), 1 / n to (n-1) / n of the lug pitch (P).
, 1 / m to (m-1) / m in the wheel group (M)
Roller wheel disposition structure of a tracked device set to a length that is obtained by adding a fractional lag pitch length multiplied by any of the above.