JPH08149914A - Driving axle cover structure for mower - Google Patents

Abstract

PURPOSE: To provide a driving axle cover structure for a mower having a simple structure and sufficient strength free from entanglement with weeds. CONSTITUTION: In a driving axle cover structure for a mower, covering the exposed part of the driving axle for a mower having a revolving blade rotating in an approximately horizontal plane, the exposed part of the driving axle 16 is circularly and rotatably equipped with a cylindrical member 19 having an inner diameter (f) larger than the outer diameter (F) of the driving axle and the width dimension (e) shorter than the width direction E of the exposed part of the driving axle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover structure mounted around a drive axle of a mowing machine for mowing grass (weeds) such as agricultural land. More specifically, the grass is entangled with the drive axle. The present invention relates to a structure for a drive axle cover of a mower to prevent it.

[0002]

2. Description of the Related Art Conventionally, a self-propelled mower has been used to mow grass inhabiting an agricultural land, and this self-propelled mower is disclosed in Japanese Patent Laid-Open No. Hei 5 (1999) -5. There is an invention described in JP-A-30837. As shown in the perspective view of FIG.
An upper surface cover 53 that covers a rotary blade (not shown) and an engine 54 that drives the rotary blade and drives the rear wheel 53 are provided between the three-wheel structure including the rear wheel 52 and the rear wheel 52. To drive the grass mower m by itself to drive the grass on the front surface of the upper cover 53 into the cover from the tip edge 53a formed in a straight line of the cover 53 and move forward while mowing with the rotary blade. Is. Further, since such a mower is mainly used for ridges having a limited width, there is a two-wheel structure with one front wheel and one rear wheel. In this case as well, the rear wheel is a drive wheel. ing.

The grass to be mowed by such a mower is often mowed when it grows to a height of about 30 to 50 cm, and this grass is mowed by a rotary blade at a position of about 3 to 8 cm from the ground. About 20-45
cm of grass will be mowed on the ground.

Since the rear wheel 52, which is the drive axle of the mowing machine m, passes through the upper portion of the mowed grass to perform the mowing work, the mowing grass may be entangled with the rotating drive axle.

When the grass is entangled with the drive axle in this way, it may interfere with the rotation of the rear wheel 52. Therefore, when the grass is entangled, it takes a lot of time and labor to remove the grass. .

Therefore, a cover member for covering the outside may be provided on the drive axle or the like of the mowing machine m. A cover member having a bellows structure, for example, is commonly used as the cover member for such a rotating shaft.

When the cover member having the bellows structure is provided on, for example, the rear wheel drive axle of the two-wheel structure, as shown in the enlarged rear view of FIG.
The outer edge 55a to the frame 57 so that only the
It is necessary to fix the inner end portion 55b to the fixed side of the inner end portion 55b and prevent the inner end portion 55b from rotating by a bearing 58, for example.

However, a machine such as a mower m used with a limited width such as a ridge has a frame 5 supporting a rear wheel 52.
There is no choice but to limit the width of 7 to a limited width. For example, the mounting width between the frame 57 and the wheel 59 may be about 70 mm on each side. Therefore, the cover member 5
The structure for fixing both ends 55a, 55b of 5 to the fixed side is difficult, and the mounting work is also very difficult.

Also, the cover member 5 having such a bellows structure.
Since 5 is usually made of rubber, stones or the like that come into contact with the rotary blade have a high probability of damaging the cover member 55, and therefore cost and labor for early replacement of the cover member 55 are also required. In view of the above problems, an object of the present invention is to provide a drive axle cover structure that has a simple structure, has no grass entanglement, and has sufficient strength.

[0010]

In order to achieve the above object, a drive axle cover structure for a mower according to a first aspect of the present invention covers a drive axle exposed portion of a mower having a rotary blade that rotates in a substantially horizontal plane. In the drive axle cover structure, a tubular member having an inner diameter larger than the outer diameter of the drive axle and a width smaller than the width of the exposed portion of the drive axle is rotatably mounted on the exposed portion of the drive axle. It is characterized by.

A drive axle cover structure for a mower according to a second aspect of the present invention is the drive axle cover structure for a mower according to the first aspect, wherein the tubular member is formed of a synthetic resin cylindrical material. To do.

A drive axle cover structure for a mower according to a third aspect of the present invention is the drive axle cover structure for a mower according to the first or second aspect, in which the tubular member is formed by a plurality of axially multi-divided members. It is characterized by having done.

[0013]

According to the drive axle cover structure of the mower according to claims 1 to 3, the inner diameter is larger than the outer diameter of the drive axle,
Since a tubular member having a width smaller than the width of the exposed portion of the drive axle is rotatably attached to the exposed portion of the drive axle, this tubular member is independent of the rotation of the drive axle and the resistance of the grass during mowing. Make a move to prevent tangling of grass.

Particularly, according to the drive axle cover structure of the mower according to the second aspect, since the tubular member is formed of the cylindrical material made of synthetic resin, the tubular member can be easily formed.

According to the drive axle cover structure for a mower according to claim 3, each tubular member is formed by a plurality of tubular members axially divided between the width dimensions of the exposed portion of the drive axle. Prevents grass entanglement by doing irregular movements.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention according to this application will be described below with reference to the drawings. FIG. 1 is an overall plan view showing an embodiment of the mowing machine according to the present application, FIG. 2 is a side view showing the entire mowing machine, and FIG. 3 is a half cross-sectional view of the vicinity of the drive axle of the mowing machine. It is an enlarged back view shown.

As shown in the figure, the main construction of the mower M in this embodiment is that the front wheel 2 and the rear wheel 3 are arranged by displacing from the center of the machine body 1 to one side (right side in this embodiment). And a two-wheeled vehicle structure in which the axle of the front wheel 2 is rotatably provided on the front frame 4 projecting forward from the machine body 1,
The axle of the rear wheel 3 is rotatably provided on a rear frame 5 provided at the rear portion of the machine body 1, and auxiliary wheels 6 are provided on the side portions of the rear wheel 3. Further, one rotary blade 7 is provided substantially in the center of the machine body 1. The rotary blade 7 has a belt wheel 8 provided on the upper part thereof and a prime mover 11 provided on the upper part of the machine body 1 via a belt 9. It is driven at a predetermined rotation speed by being driven by the belt wheel 10.

The rotary blade 7 is a straight blade in which two blades are formed in a straight line, and rotates about an axis of rotation O in an arc indicated by a chain double-dashed line. An upper surface cover 12 is provided on the upper surface of the rotary blade 7 so as to cover the upper surface of the rotary blade 7 and the three surfaces on both sides thereof. It is configured so that it does not scatter sideways.

On the other hand, power is transmitted from the prime mover 11 to a transmission 13 provided behind the prime mover 11, and the transmission 1
3 is transmitted via a drive chain 15 to an output sprocket 17 provided on a drive axle 16 of the rear wheel 3. Reference numeral 18 denotes a cover member that covers the sprockets 14 and 17 and the chain 15.

A tubular member 19 is provided between the rear frame 5 and the wheel 3a of the rear wheel 3 driven by the drive axle 16. The tubular member 19 is formed to have a width dimension e smaller than the drive axle exposed portion width dimension E between the bearing 20 supporting both ends of the drive axle 16 and the wheel 3a of the rear wheel 3, and the drive axle 16 It is made of a cylindrical material having an inner diameter f larger than the outer diameter F and is mounted on the drive axle 16 so as to be rotatable independently of the rotation of the drive axle 16. Therefore, when the drive axle 16 is stopped, the tubular member 19 is in a state of hanging down from the drive axle 16. The tubular member 19 may be a resin molded product, a light metal, or the like, but if it is formed of a synthetic resin cylindrical material, it can be easily and inexpensively constructed.

Further, in this embodiment, as an example where the relationship between the tubular member 19 and the rear frame 5 and the wheel 3a is preferable, the tubular member inner diameter f (about 44 mm) and the drive axle outer diameter F (about 22 mm). A cylindrical member having a gap of about 11 mm over the entire circumference between and and a gap of about 6 mm between the width dimension e (about 70 mm) of the tubular member and the width dimension E (about 76 mm) of the exposed portion. A member 19 is formed.

In the tubular member 19, the gap between the tubular member inner diameter f and the drive axle outer diameter F is about 5 to 2 over the entire circumference.
If the gap between the width e of the tubular member and the width E of the exposed portion is 5 mm and the gap is about 2 to 10 mm on one side, the grass can be efficiently prevented from being entangled.

According to the drive axle cover structure of the mower of this embodiment constructed as described above, the mowing work can be performed without the entwined grass being entangled with the drive axle by acting as shown in the sectional view of FIG. It can be carried out.

That is, the grass n mowed by the rotary blade 7 lies on a ridge or the like, and the mowing machine M advances while stepping on the upper part thereof by the front wheel 2 and the rear wheel 3 which is a drive wheel. At this time, a part of the grass n stepped on by the rear wheel 3 may face upward, but the outer peripheral portion of the drive axle 16 moves unrelated to the rotation of the drive axle 16 and the resistance of the grass. Due to the presence of the tubular member 19, the grass n hits the tubular member 19 and is removed without being entangled with the drive axle 16. The movement of the tubular member 19 is, for example, irregular rotational movement or tilting movement, and these movements may occur at the same time.

Therefore, during the mowing work, the tubular member 19 always covers the exposed portion regardless of the rotation of the drive axle 16,
It is possible to proceed with the mowing work without the cut grass getting entangled with the drive axle 16, and even if the uncut grass n or the like tries to get entangled with the drive axle 16, the drive shaft 16 is blocked by the tubular member 19. It is possible to carry out an efficient reaping work without getting entangled in.

In the above embodiments, the cylindrical tubular member 19 has been described as an example. However, even if it is an octagonal tubular member, the same operational effect can be obtained, and the invention is related to this application. The invention is not limited to the embodiments described above.

Also, the tubular member 19 is not limited to the above-mentioned embodiment, but if the tubular member 19 is made into a multi-divided structure such as a bi-divided structure on one side in accordance with the grass n to be mowed, each tubular member 19 will not be formed. It is possible to prevent the entanglement of the grass n by performing a regular exercise and to prevent the entanglement more effectively.

[0028]

Since the invention according to this application is configured as described above, it has the following effects.

According to the drive axle cover structure for a mower according to any one of claims 1 to 3, a tubular shape having an inner diameter larger than the shaft diameter of the drive axle and a width dimension shorter than the drive axle exposed portion width dimension. Since the member is rotatably attached to the exposed part of the drive axle, this cylindrical member prevents movement of the drive axle during mowing and is independent of the grass resistance to prevent entanglement of the grass, and for a long time. Efficient continuous work can be performed without stopping the mowing work.

Particularly, according to the drive axle cover structure of the mower according to claim 2, since the tubular member is formed of the cylindrical material made of synthetic resin, the tubular member can be easily formed, which is simple. With the configuration, the effect of preventing grass entanglement can be achieved.

According to the drive axle cover structure for a mower according to claim 3, each tubular member is formed by a plurality of tubular members axially divided between the width dimensions of the exposed portion of the drive axle. Does irregular movements to prevent grass entanglement, so it is possible to perform a stable and efficient mowing operation that has an effect of preventing grass entanglement.

[Brief description of drawings]

FIG. 1 is an overall plan view showing an embodiment of the invention according to this application.

2 is a side view showing the entire mower of FIG. 1. FIG.

3 is an enlarged rear view showing the vicinity of the drive axle of the mower shown in FIG. 1. FIG.

FIG. 4 is a rear view showing the operation of the invention according to this application.

FIG. 5 is a perspective view showing an entire conventional mower.

6 is an enlarged rear view showing an example of the vicinity of a drive axle of the mower shown in FIG.

[Explanation of symbols]

 1 ... Aircraft 2 ... Front wheel 3 ... Rear wheel 3a ... Wheel 4 ... Front frame 5 ... Rear frame 7 ... Rotating blade 8 ... Belt wheel 11 ... Motor 12 ... Top cover 13 ... Transmission 14 ... Drive sprocket 15 ... Drive chain 16 ... Drive axle 17 ... Output sprocket 19 ... Cylindrical member 20 ... Bearing e ... Cylindrical member width dimension E ... Exposed part width dimension f ... Cylindrical member inner diameter F ... Drive axle outer diameter n ... Grass M ... Mowing machine

Claims (3)

[Claims] 1. A drive axle cover structure for covering a drive axle exposed portion of a mower having a rotary blade that rotates in a substantially horizontal plane, wherein the exposed portion of the drive axle has an inner diameter larger than an outer diameter of the drive axle. A drive axle cover structure for a mower, wherein a tubular member having a width dimension shorter than the drive axle exposed portion width dimension is rotatably mounted. 2. The drive axle cover structure for a mower according to claim 1, wherein the tubular member is formed of a synthetic resin cylindrical material. 3. The drive axle cover structure for a mower according to claim 1 or 2, wherein the tubular member is formed by a plurality of axially multi-divided members.