JPH0638403U - Protecting device for the end of the cultivating shaft - Google Patents

Abstract

(57) [Summary] [Purpose] In the center drive type rotary tiller R, the head 10 of the mounting bolt 10 for fixing the tiller shaft 7
a, the outer end of the cultivating shaft 7 and the shoulder 6a of the cultivating claw holder 6
It is an object of the present invention to provide a protection device which can avoid abrasion of the same and can be replaced easily and inexpensively. [Structure] An outer end portion of a tilling shaft 7 has a rotation diameter larger than that of a tilling claw holder 6 and has a mounting bolt 1
The protective body 1 having a rotation locus surrounding the head 0 a of 0 was attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a protective device for avoiding wear generated in a tiller claw holder and a mounting bolt formed at an outer end of a tiller shaft of a center drive type rotary tiller.

[0002]

[Prior art]

 Conventionally, a drive shaft of a center drive type rotary cultivator has been fitted with a cultivating shaft, and the cultivating shaft is integrally fixed to the drive shaft by a mounting bolt inserted from the outside of the cultivating shaft. ing. Therefore, the head of the mounting bolt projects outward from the outer end of the cultivating shaft, and the outer end of the cultivating shaft is used in order to effectively take the plowing width of the cultivating part by the rotary cultivator. The tiller claw holder disposed at is disposed so as to be positioned immediately inside the outer end of the tiller shaft. However, since the actual tilling working part is the inside of the tilling claw attached to the tilling holder at the outer end of the tilling shaft, when the tilling shaft is lower than the surface of the tilling soil, the head of the mounting bolt, The outer end of the tillage shaft and the outer end of the tiller claw holder at the outer end of the tiller shaft move outside the outer surface of the tiller claw and move while rotating in the uncultivated soil. Therefore, there is a drawback that the head of the mounting bolt, the outer end of the cultivating shaft, and the shoulder of the cultivating claw holder are significantly worn.

When the head of the mounting bolt wears and the hexagonal corners of the head become rounded, the corner is not caught and a general tool such as a spanner is used to mount the bolt. Since it becomes impossible to remove the bolt head, in order to avoid wear, for example, as described in Japanese Utility Model Publication No. 58-54882 and Japanese Utility Model Publication No. 3-25524, bolt head bearings are attached to the outer end of the tiller shaft. And a protective body is provided. There is also a configuration in which a specially shaped bent claw is used as a plowing claw to avoid wear of the head of the mounting bolt.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned prior art, although it is possible to avoid wear of the head of the mounting bolt, it is not possible to avoid wear of the outer end of the cultivating shaft and the shoulder of the cultivating claw holder. If the outer edge and the shoulder of the tiller holder become worn, the tiller shaft itself must be replaced, which is very expensive and is not desirable. Further, the bent claw is expensive and undesirable. Therefore, in order to solve such a problem, the present invention can be manufactured at low cost, and at the same time avoids abrasion of the head of the mounting bolt, the outer end of the tiller shaft, and the shoulder of the tiller holder. It is an object of the present invention to provide a protective device which can be replaced easily and inexpensively.

[0005]

[Means for Solving the Problems]

 The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, according to the present invention, a cultivating shaft is inserted into an outer end portion of a drive shaft of a center drive type rotary, a mounting bolt is inserted from the outside of the cultivating shaft, and the cultivating shaft is attached to the drive shaft. In the rotary cultivator, the outer end of the cultivating shaft is equipped with a protector having a rotation diameter larger than the rotation diameter of the cultivating claw holder and having a rotation path surrounding the head of the mounting bolt. .

[0006]

[Action]

 Next, the operation will be described. The protector 1 is manufactured by bending a strip steel plate so as to have a rotation diameter larger than the rotation diameter of the tillage claw holder 6 that is planted on the tiller shaft 7 of the rotary tiller R, and the tiller shaft 7 is provided at the tip. The outer side end of the tilling claw holder 6 ・ 6 is attached and fixed to the outside of the tilling claw 8 ・ 8 and the shoulder portion 6a is covered from the side surface, and the side portions 8a ・ 8a of the outside surface of the tilling claw 8. The bent portions 1a, 1a to be locked are formed to have a function to prevent the protective body 1 from rotating, and the central portion is fitted into the bolt receiving portion 7a at the outer end of the tiller shaft 7, and the head portion 10a of the mounting bolt 10 is fitted. A concave portion 1b having a rotation locus that surrounds the head is formed to have a function of protecting the head portion 10a of the mounting bolt 10.

Further, by configuring the protective body 1 as described above, when performing the cultivating work by the rotary tiller R, the protective body 1 rotates around the tightening torque of the mounting bolt 10 and the front end portion of the protective body 1. Before the shoulder 6a of the tiller claw holder 6 at the outer end of the tiller shaft 7 comes into contact with the uncultivated soil by the stopping function, the unfolded portion 1a of the protector 1 is not Since the plowing soil is scraped off and the mounting bolt 10 also has the protective body 1 located at the outermost end of the plowing shaft 7, the head portion 10a of the mounting bolt 10 does not come into direct contact with the unplumbed soil. is there.

Further, since the protector 1 is manufactured by bending a strip-shaped steel plate and the central recess 1 b is not configured to surround the head 10 a of the mounting bolt 10, soil around the head 10 a is not formed. It does not prevent the mounting bolt 10 from being clogged so tight that it cannot be removed with a tool, or the head 10a of the mounting bolt has rusted and the mounting bolt 10 cannot be removed with a tool. Further, since the outermost end of the protective body 1 has a relatively large area, the protective body 1 has high durability against abrasion, and even if the abrasion progresses, it can be replaced at low cost and easily. Of.

[0009]

【Example】

 Next, an embodiment shown in the attached drawings will be described. 1 is an overall side view of a mobile farm T equipped with a rotary tiller R at the rear, FIG. 2 is a rear cross-sectional view of a tiller A of a rotary tiller R, and FIG. 3 is a tiller shaft end of the present invention. 4 is an exploded perspective view showing an embodiment of the protective device of FIG. 4, FIG. 4 is a rear partial cross-sectional view of the same, FIG. 5 is a side view of the same, FIG. 6 is a side view of the protective body 1, FIG. 7 is a front view of the same, and FIG. 8 is a side view showing another embodiment, FIG. 9 is a side view of another protector 2, and FIG. 10 is a front view of the same.

1 and 2, the mobile agricultural machine T is supported by a front wheel 21 and a rear wheel 22, and an engine E and the like are mounted in a front hood 23. A rotary cultivator R is mounted on the rear part of the mobile agricultural machine T so as to be vertically movable up and down. The power from the engine E of the mobile agricultural machine T is attached to the rotary cultivator R of the rotary cultivator R. It is transmitted to the drive chain 3 in the transmission case 12 through a pair of bevel gears (not shown) arranged in the upper portion, and is transmitted from the drive chain 3 through the lower sprocket 5 in the transmission case 12. A center drive type tilling section A is constructed in which the drive shaft 4 is driven by being transmitted to the drive shaft 4 which is penetratingly supported in the lower part of the transmission case 12 in the lateral direction.

The drive shaft 4 is spline-fitted to one end of a tubular cultivating shaft 7 having a plurality of cultivating claw holders 6, 6, ... The mounting bolts 10 and 10 are inserted from the other end (outer side) of 7 and screwed into the female screws 4a and 4a formed on the shaft core of the outer end portion of the drive shaft 4 to be integrated with the drive shaft 4. It is mounted and fixed, and is configured to rotate in conjunction with the rotation of the drive shaft 4. It should be noted that the tilling claw holders 6, 6 ... are fixedly attached with the tilling claws 8, 8 ... By means of the stoppers 14, 14, ... Composed of bolts and nuts. .. are rotated in association with the rotation of the cultivating shafts 7 and 7, whereby the cultivating work is performed.

In FIGS. 3, 4, and 5, a bolt receiving portion having a concave rear view in cross section is provided at an outer end portion of the cultivating shaft 7 via a partition plate 13 having a hole portion 13 a opened in a central portion thereof. 7a is formed, and the protective body 1 is attached to the bolt receiving portion 7a by the mounting bolt 10. The protective body 1 is manufactured by bending a strip-shaped steel plate so as to have a rotation diameter larger than the rotation diameter of the tiller claw holder 6, and as shown in FIGS. The bent portions 1a, 1a are formed on the. The bent portions 1a, 1a are attached so as to cover the shoulder portions 6a, 6a on the outer side of the outer end of the tiller shaft 7 from the outer surface of the tiller nails 8, 6 outer side of the tiller nails 8, 8a. The claws 8 are locked to the side portions 8a of the outer surface of the claw 8, and the bent portion 1a is locked to the side portions 8a so that the protective body 1 has a rotation preventing function.

Further, a concave portion 1b having a hole 1c opened is formed in the central portion of the protective body 1, and the concave portion 1b is fitted into the bolt receiving portion 7a, and the bolt receiving portion 7a. 7a and the head portion 10a of the mounting bolt 10 are sandwiched and mounted. Further, the concave portion 1b of the protective body 1 has a rotation locus that surrounds the head portion 10a of the mounting bolt 10, and the protective body 1 is located at the outermost end of the tiller shaft 7. It is configured to have a function of protecting the head 10a of the. A washer 9 is interposed between the recess 1b and the bolt receiving portion 7a. Therefore, the mounting bolt 10 is screwed into the female screw 4a of the drive shaft 4 from the outside of the cultivating shaft 7 through the protective body 1, the washer 9, and the cultivating shaft.

Further, in this embodiment, the tilling claw 8 is attached and fixed to the tilling claw holder 6 by the stopper 14 composed of a bolt and a nut, but as another embodiment, FIG. As shown in FIG. 10, in order to facilitate the attachment / detachment when replacing the tilling claw 8, when the tilling claw 8 is fixedly attached to the tilling holder 6 by the claw mounting pin 20, the mounting bolt 10 is provided at the center. Only the recessed portion 2b having the function of protecting the head 10a of the head is formed, and the protector 2 is made of a strip-shaped steel plate having a rotation diameter larger than the rotation diameter of the tiller claw holder 6, and the rotation preventing function of the protection body 2 It is also possible that the longitudinal end of the protector 2 is locked to the head of the claw mounting pin 20.

With the above-described configuration, when the rotary cultivator R is used for cultivating work, the protector 1 (2) is cultivated by the tightening torque of the mounting bolt 10 and the function of preventing the tip of the protector 1 from rotating. Before the shoulder 6a of the tiller claw holder 6 at the outer end of the tiller shaft 7 comes into contact with the uncultivated soil, the uncultivated soil is scraped off at the bent portion 1a of the protective body 1 by rotating along with the shaft 7. Since the protective body 1 is located at the outermost end of the tilling shaft 7 with respect to the mounting bolt 10, the head 10a of the mounting bolt 10 does not directly contact the uncultivated soil.

[0016]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. That is, the protective body can simultaneously prevent abrasion of the head of the mounting bolt, the outer end of the tiller shaft, and the shoulder of the tiller claw holder, so that the head of the mounting bolt, the outer end of the tiller shaft, and the tiller. The shoulder of the nail holder can be protected at the same time. Also, by forming the protective body by bending the strip-shaped steel sheet, the protective body can be manufactured at low cost, and the recess in the center portion is configured to surround the head of the mounting bolt. Since the head is not removed, the soil around the head is hard and the mounting bolt cannot be removed with a tool, or the head of the mounting bolt is rusted and the mounting bolt cannot be removed with a tool. In addition, even if the protective body is worn, it can be replaced at low cost and easily and at low cost.

[Brief description of drawings]

FIG. 1 is an overall side view of a mobile agricultural machine T having a rotary cultivator R mounted on a rear portion thereof.

2 is a rear cross-sectional view of a cultivating part A of a rotary cultivator R. FIG.

FIG. 3 is an exploded perspective view showing an embodiment of a device for protecting the end of a tilling shaft according to the present invention.

FIG. 4 is a rear partial cross-sectional view of the same.

FIG. 5 is a side view of the same.

FIG. 6 is a side view of the protector 1.

FIG. 7 is a front view of the same.

FIG. 8 is a side view showing another embodiment.

FIG. 9 is a side view of another protector 2.

FIG. 10 is a front view of the same.

[Explanation of symbols]

 1, 2 Protective body 4 Drive shaft 6 Cultivating claw holder 7 Cultivating shaft 8 Cultivating claw 10 Mounting bolt 20 Claw mounting pin A Cultivating part R Rotary cultivator T Mobile agricultural machine

Claims (1)

[Scope of utility model registration request] 1. A rotary tiller constructed such that a cultivating shaft is fitted into an outer end portion of a drive shaft of a center drive type rotary, a mounting bolt is inserted from the outside of the cultivating shaft, and the cultivating shaft is attached to the drive shaft. In the machine, the outer end of the tiller shaft is provided with a protector having a rotation diameter larger than that of the tiller claw holder and having a rotation track surrounding the head of the mounting bolt. Shaft end protection device.