JPH0219001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to tires and wheels for wet fields that are mainly equipped on walking-type mobile agricultural machines such as binders and tillers.

Wheels equipped with large-area lug plates or float lugs were generally used for driving in wet fields to provide greater buoyancy.
These machines have the problem of scratching up a large amount of mud when running, resulting in ruined tracks, and when running on roads leaving fields, the machine body moves up and down significantly, making it difficult to run smoothly.

Therefore, in order to be able to drive on the road without the above problems, it is possible to use tire wheels, but conventionally, tire wheels have been used to obtain enough ground contact area to suppress subsidence even on soft ground such as extremely wet fields. Attempts have been made to increase the ground contact area of tires by increasing the diameter of the wheels, using tires made of softer materials, or reducing the thickness of tire members.

However, if the wheel diameter is made larger than necessary, there are drawbacks such as hindering miniaturization of the entire aircraft and making it difficult to steer.

Furthermore, when a soft tire with a thin wall thickness is used, the durability against tire wear caused by running is extremely low, and there is also the drawback that it is difficult to obtain sufficient thrust.

If only the running performance in ultra-humid fields is considered, it would be possible to use a tire with a polygonal outer shape, such as that disclosed in Japanese Patent Publication No. 52-37845. This cannot avoid the problem of large vibrations generated during road running, similar to the aforementioned non-tire wheels using lug plates or float lugs.

The present invention has been made in view of the above-mentioned circumstances, and is capable of suppressing sinking of the aircraft body while having sufficient propulsion ability when traveling in soft fields, and is capable of traveling on roads. The purpose of the present invention is to provide tires and wheels for wet paddy fields of mobile agricultural machinery that are inexpensive and capable of suppressing damage to the fields with their tracks and of reducing the size of the fields.

In order to achieve the above object, the tire wheel for wet fields of a mobile agricultural machine according to the present invention has a rubber tire whose appropriate internal pressure is about the same as the external pressure fitted on the outer circumferential side of a wide rim. The rubber tire part at the contact point is bent flat to less than half the radial thickness of the rubber tire part at the non-contact point, and the contact surface part in this flat bent state has a longitudinal width larger than its horizontal width. Further, on both sides of the rubber tire in the left and right width direction, and around the corner where the outer circumferential surface portion and the lateral side wall portion intersect, grooves are formed in a direction crossing the tire circumferential direction. A characteristic configuration is characterized in that concentric grooves are provided on the outer surface of the lateral side wall portion of the rubber tire along the circumferential direction of the tire at a position close to the rim.

In other words, by making the internal pressure of the rubber tire and the external pressure the same, the ground contact point of the wide rubber tire can be bent sufficiently flat to obtain a large contact area. By forming grooves in the direction that intersects the circumferential direction of the tire around the corner where the face part and the lateral side wall part intersect, the flexibility of the tire will be increased at the groove location. Even if the tire is not soft or thin, it is easy to flatten the contact patch.

Furthermore, since rubber tires also have concentric grooves along the tire circumferential direction on the outer surface of the sidewalls near the rim, the sidewalls are easily bent and deformed in the left and right width direction. It's summery.

Therefore, while avoiding an extreme drop in durability against wear, it is possible to improve sinking resistance by ensuring a sufficient ground contact area, and to obtain the required thrust while maintaining the required strength of the tire.

Moreover, the tire is not intended to be firmly maintained in a fixed shape such as a polygonal shape, but rather is configured so that the outer shape of the tire can be easily partially deformed using the biconcave grooves. The occurrence of large vertical vibrations caused by rotation while driving on the road can also be automatically eliminated.

Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 show the case where the wet paddy tire wheel of the present invention is mounted on a walking binder, and this binder includes a wide low pressure wet paddy tire wheel 5 whose height is freely adjustable, a steering handle 6, and engine related parts. 1
1, a reaping device 10 comprising a weeding tool 7, a pulling device 8, and a clipper type cutting blade 9,
At the same time, a binding device 1 is provided on one lateral side of the reaping device 10 for tying the reaped stem culms in fixed quantities and releasing them outwardly on the lateral side in a sideways posture in which the tip of the stem culm moves away from the machine body. A binder main machine 2 is configured, and a tied stem culm collecting device 3 is mounted on this machine 2 to receive and place and collect the tied stem culms released from the binding device 1 at the side of the body on the side where the tied stem culms are released. is supported.

The tied stem culm collecting device 3 slides on the mud surface,
Also, a float 3A having a long bundled stem culm receiving mounting surface in the front-back direction, and a frame for mounting on the machine 2 that freely pulls the float 3A only around the front-back axis a and the lateral axis b. 3B, and by supporting the frame 3B movably only in the front and back direction on a pair of front and rear stages 12, 12 connected to the machine 2, the float 3A is connected to the machine 2 (the bundling stem from the bundling device 1). It is configured so that it can be moved back and forth with respect to the culm release position) and placed and collected in a state in which the released and tied stem culms are lined up in the front and back direction.

A moving mechanism is provided that automatically and sequentially moves the collection device 3 backward in conjunction with the operation of the binding device 1.

The moving mechanism is provided with a sensor 13 that detects activation of the bundling device 1 by being pressed by the discharge bundling stem culm and swings, and a sensor 13 is provided between the frame 3B of the focusing device 3 and the main unit 2. , the frame 3 resists the ground resistance acting on the float 3A.
A movement regulating mechanism 4 is provided which can fix B (float 3A) at any position in the longitudinal direction relative to the main body 2, and in conjunction with the detected rocking motion of the sensor 13, the movement regulating mechanism 4 is provided to prevent the float 3A from swinging again until the sensor 13 returns to rocking motion. An interlocking wire 14 is provided in between to release the movement restriction mechanism 4, and each time the bundled stem culm is released, the float 3A is intermittently activated using ground resistance.
is configured to be moved rearward with respect to the machine 2.

The movement restriction mechanism 4 includes a rack 15 having a large number of locking portions arranged in parallel in the front and rear direction on the frame 3B.
At the same time as fixing the rack, this rack 15 is
A locking pawl 16 is attached to the main unit 2 side and is detachable from the locking portion of the device and is interlocked and connected to the interlocking wire 14.

According to the binder having the above configuration, float 3A
By starting the work with the rear end corresponding to the position where the tied stem culm is released from the binding device 1, the float 3A automatically moves backward intermittently every time the tied stem culm is released. The bundled stem culms are placed and collected in parallel in the front-back direction.

The wheel 5 uses a wide low-pressure tire wheel that uses an internal pressure similar to the external pressure as the appropriate pressure, in order to secure a sufficient ground contact area and ensure reliable running even though the wheel 5 is running on one wheel. can be,
In addition, it is constructed as follows so that it can be bent sufficiently and can be widely grounded.

That is, as shown in FIGS. 4 and 5, the wheel 5 has a rubber tire 5B with lugs fitted onto a rim 5A. Concave grooves 5a are formed along the direction intersecting the tire circumferential direction around the corners where the rubber tire 5B intersects with the tire circumference. A plurality of other concave grooves 5b are provided concentrically along the direction.

According to the above configuration, the concave grooves 5a at multiple locations in the circumferential direction...
This makes it easy for the rubber tire 5B to bend in the vertical direction, and the annular grooves 5b near the rim make it easy for the lateral side walls of the rubber tire 5B to bend outward, as shown in FIG. On the ground contact side, the inner surface of the rubber tire 5B on the ground contact side is
It is bent until it comes into contact with the inner surface of the lateral side wall portion which is bent in an S-shape. In this bent and flat state, the vertical thickness _H2 , which corresponds to the radial length of the tire portion at the ground contact point, is ₁ / of the vertical thickness H1, which corresponds to the radial length of the non-ground contact side. 2 or less, and the front-to-back width W ₂ of the ground contact surface portion is larger than the lateral width W ₁ , so that a ground contact condition with a high subsidence suppressing function can be obtained.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall side view of the binder, FIG. 2 is a plan view thereof, and FIG.
The figure is a plan view of the bundled stem culm collecting device, FIG. 4 is a side view of the tire wheel, and FIG. 5 is a longitudinal sectional front view thereof. 5A...Rim, 5B...Rubber tire, 5a...
Concave groove, 5b... annular groove.

Claims (1)

[Scope of Claims] 1. A rubber tire 5B whose internal pressure is approximately the same as the outside air pressure is fitted onto the outer circumferential side of the wide rim 5A, and the rubber tire portion of the rubber tire 5B at its ground contact point is non-contact. The rubber tire portion is bent flat to less than half the radial thickness of the rubber tire portion at the ground contact point, and the contact surface portion in this flat bent state is configured to have a longitudinal width larger than its left and right width, and further, Concave grooves 5a in a direction intersecting the tire circumferential direction are provided in the tire circumferential direction on both sides of the rubber tire 5B in the left-right width direction and around the corners where the outer circumferential surface part and the lateral side wall part intersect,
A rim 5 is provided on the outer surface of the side wall portion of the rubber tire 5B.
A wet paddy tire wheel for a mobile agricultural machine in which a concentric concave groove 5b along the circumferential direction of the tire is provided at a position close to A. 2. The tire wheel for wet fields of a mobile agricultural machine according to claim 1, wherein when the rubber tire 5B is in contact with the ground, the inner surface on the grounding side is brought into contact with the inner surface of the bent side wall portion.