JPH0617674Y2 - Crawler traveling device for agricultural vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a driving wheel at a diagonally upper front position of a straight line track frame along the longitudinal direction of the machine body, and arranges a plurality of grounding wheels on the track frame. Among these grounding wheels, a plurality of grounding wheels except grounding rollers located at both ends in the longitudinal direction of the machine body are configured as movable grounding wheels capable of swinging displacement up and down. The present invention relates to a crawler traveling device for an agricultural vehicle in which a crawler belt is wound around a plurality of grounded wheels.

[Conventional technology]

In the above-mentioned crawler traveling device for agricultural work vehicles, conventionally,
The swinging arms of all the movable grounding wheels are configured to be long so that the vertical movement loci of the plurality of movable grounding wheels are substantially linear.

[Problems to be solved by the invention]

As described above, since the movable grounding wheel is vertically moved up and down, the amount of displacement of the movable grounding roller moving forward and backward with respect to the fixed grounding roller due to the vertical movement of the movable grounding roller is set. As a result, the positional relationship of the grounding roller with respect to the cored bar embedded in the crawler belt at a constant pitch is prevented from being greatly disrupted by the vertical movement of the movable grounding roller, and the wheel removal prevention performance is avoided. It is possible to suppress the decrease of the ground as much as possible, but since the part of the return path from the rear side to the front side of the crawler belt has a rearward descending inclined posture, the movable grounding located on the rear side as in the past has been. If the swinging arm of the roller wheel is long, the movable grounding roller pushes up the rear side, which is the lower position of the rear side of the return path of the crawler belt, as the movable grounding roller rises. Tension of the upper side is increased,
The amount of wrapping of the crawler belt on the drive wheels is reduced,
There is a possibility that slip may occur between the drive wheel and the crawler belt.

An object of the present invention is to suppress the deterioration of the wheel release prevention performance due to the vertical movement of the movable grounding wheel as much as possible, while suppressing the thrusting up of the movable grounding roller on the rear side of the return path of the crawler belt as much as possible. There is a point to.

[Means for solving problems]

The characteristic configuration of the present invention is that the radius of curvature of the vertical movement locus of the movable grounding wheel located on the front side of the movable grounding wheels is greater than the radius of curvature of the vertical driving locus of the movable grounding wheel located on the rear side. It is set to a large size.

[Action]

Since the movable grounding wheel on the front side can move up and down with a large radius of curvature, it is possible to prevent the vertical movement of the movable grounding wheel from significantly deteriorating the positional relationship of the grounding wheel with respect to the core of the crawler belt. , This movable ground roller is
Since the crawler belt is located at a position that acts on the inner surface of the front part at the higher position of the return path part from the rear side to the front side, the movable grounding roller does not move in an abnormally large amount unless the movable grounding wheel moves abnormally. The ground roller does not push up the inner surface of the crawler belt.

Since the movable grounding wheel on the rear side moves up and down with a small radius of curvature, even if it is raised to the same height as before, the thrust position of the movable grounding roller with respect to the return path of the crawler belt moves to the front side. As a result, the movable grounding roller wheel pushes up the front side, which is at a relatively high position in the rear side of the return path of the crawler belt, as compared with the conventional one that moves up and down with a large radius of curvature. As a result, the thrust amount with respect to the crawler belt can be suppressed to be small.

[Effect of device]

Therefore, by reasonably setting the radii of curvature of the plurality of movable rolling wheels located in the front and rear as described above, it is possible to avoid the deterioration of the wheel removal prevention performance as much as possible, but the crawler belt accompanying the rise of the movable grounding rolling wheel is prevented. It was possible to reliably prevent the occurrence of slip between the drive wheel and the crawler belt by suppressing the amount of push-up with respect to.

〔Example〕

FIG. 1 shows a crawler traveling device (A) provided in an agricultural work vehicle such as a combine harvester. This crawler traveling device
(A) is a track frame (1) formed in a straight line along the longitudinal direction of the fuselage, drive wheels (2) arranged diagonally above and above the track frame (1), and the track frame ( 5) arranged at a certain pitch in the longitudinal direction of the machine in 1)
Individual grounded wheels (3A), (3B), (3C), (3D), (3E), the drive wheel (2) and five grounded wheels (3A), (3B), (3C) ， (3D) ，
A rubber crawler belt (4) wound around (3E).

The five grounding rollers (3A), (3B), (3C), (3D), (3E) that contact the inner surface of the grounding belt portion of the crawler belt (4).
Of these, the rearmost grounding wheel (3E) is attached to the movable member (5) that is inserted and held in the track frame (1), and as a tension wheel that can adjust the tension of the crawler belt (4). It is configured to work.

Also, the above-mentioned five grounding wheels (3A), (3B), (3C), (3D), (3E)
Out of these, the outer wheel type grounding wheel (3A) located on the frontmost side
Is attached to the support shaft (7) mounted on the support boss (6) attached to the lower surface of the track frame (1) to form a fixed grounding wheel, and the grounding roller located at both ends in the machine longitudinal direction. (3A),
Three inner wheel type grounding rollers (3B), (3C), (3
Each of D) is attached to the track frame (1) so as to be vertically movable via a swing arm (8) to constitute a movable grounding wheel.

The mounting structure of the three movable grounding wheels (3B), (3C), (3D) will be described in detail as shown in FIGS. 2 and 3.
A substantially triangular swing arm (8) is attached to a lateral support shaft (10) inserted through and supported by each of three support bosses (9) penetrating the track frame (1). Attach three grounding wheels (3B), (3C), and (3D) to the support shaft (11) attached to the corner of 8) via bearings and move them up and down with respect to the track frame (1). It is configured as a movable movable wheel.

Each of the movable grounding wheels (3B), (3C), (3D) is provided with an urging mechanism (13) for urging the movable grounding wheel (3B), (3C), (3D), and the urging mechanism (13) The sliding shaft (14) pivotally supported at the angle of the swing arm (8) and the free end side of this sliding shaft (14) are supported by a rod (15) fixed to the sliding shaft (14) in the machine longitudinal direction. Bracket fixed to the upper surface of the track frame (1)
(16) and the spring receiver (1
7) and a spring (18) arranged between the bracket (16). In addition, the rod (15),
A nut (19) for adjusting the distance between the spring receiver (17) and the bracket (16) is screwed into the movable ground roller (3B), (3).
The maximum descending position of each of C) and (3D) can be adjusted.

On the spring receiving surface of the spring receiver (17), a cylindrical regulating member (20) extended toward the bracket (16).
When the movable grounding wheels (3B), (3C), and (3D) swing up and down, the tip of the regulating member (20) contacts the bracket (16), and The wheels (3B), (3C), and (3D) can be prevented from rising further.

The lower surface of the track frame (1) includes a fixed grounding wheel (3A) at least at the front end of the grounding wheels (3A) and (3E) located at both ends in the longitudinal direction of the machine body (3A). 3
4 support bosses for mounting A), (3B), (3C) and (3D)
(6) is attached, and as shown in FIG. 5, the grounding rollers (3A), (3B), (3C), and (3D) are respectively attached to the four support bosses (6) as spindles ( By attaching via the 7), the crawler traveling device (A) can be fixedly constructed with the same track frame (1).

As shown in FIG. 4, the support boss (6) is received and held by a receiving member (21) welded to the lower surface of the track frame (1).

As shown in FIGS. 6 and 7, a cover (22) for covering the lower part of the receiving member (21) is provided, and the cover (22) is provided.
Insert the bolt (23) through the vertical wall provided at one end of
The cover (22) and the support shaft (7) can be fixed to the track frame (1) through the support boss (6) by being screwed into the support shaft (7) inserted through the support boss (6). I have to. still,
The cover (22) is formed with a discharge port (22A) for discharging mud and the like accumulated between the receiving member (21) and the cover (22).

As shown in FIG. 1, the movable grounding wheels (3B), (3C), (3
In D), the radius of curvature (S) of the vertical movement locus of the movable grounding wheel (3B) located on the front side is moved vertically by the two movable grounding wheels (3C) and (3D) located on the rear side. In order to set the radius of curvature of the trajectory larger than the radius of curvature (R), the swing arm (8) of the front movable grounding wheel (3B) is connected to the two rear movable grounding wheels (3C), (3D). The crawler belt is longer than each swing arm (8), and it is possible to avoid deterioration of wheel removal prevention performance as much as possible, but with the rise of the two movable grounding wheels (3C) and (3D) on the rear side. The amount of thrust to (4) can be kept small.

[Another embodiment]

In the above embodiment, three movable ground wheels (3B), (3C), (3D)
However, the number of movable grounding wheels may be two or four or more.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a crawler traveling device for agricultural vehicles according to the present invention, FIG. 1 is a side view of a movable crawler traveling device, and FIG. 2 is a cross-sectional plan view showing an arrangement portion of a movable grounding wheel.
FIG. 3 is a vertical cross-sectional rear view showing the support portion of the movable grounding wheel,
FIG. 5 is a perspective view of a support boss, FIG. 5 is a side view of a fixed crawler traveling device, FIG. 6 is a cross-sectional plan view showing an arrangement portion of a fixed ground roller, and FIG. It is a vertical section rear view showing a part. (1) …… Track frame, (2) …… Drive wheel, (3A), (3B), (3C), (3D), (3E) …… Grounding wheel, (4) …… Crawler belt, ( R), (S) ... radius of curvature.

Claims (1)

[Scope of utility model registration request] 1. A drive wheel (2) is provided at a diagonally upper front position of a straight line track frame (1) along the longitudinal direction of the machine body, and a plurality of grounding wheels (3A), (3B) are provided on the track frame (1). ), (3
C), (3D), (3E) are installed, and these grounding wheels (3A), (3B),
Of (3C), (3D), and (3E), multiple grounded wheels (3B), (3
C) and (3D) are configured as movable grounding wheels that can be displaced up and down, and the drive wheel (2) and the plurality of grounding wheels (3
A), (3B), (3C), (3D), (3E) crawler belt
(4) A crawler traveling device for an agricultural work vehicle wound around the movable grounding rollers (3B), (3C) and (3D), wherein the movable grounding rollers (3B) located on the front side are vertically moved. The radius of curvature (S) of the locus of movement is set to be larger than the radius of curvature (R) of the vertical locus of movement of the movable grounding wheels (3C) and (3D) located on the rear side. .