JP3037343U - Engine cutter - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To prevent a reduction of a cutting range of a cutter disk while securing a torque required for cutting. An engine cutter includes a housing (2, 3) having one end connected to an engine unit (1) and an input shaft (10) from the engine unit (1) at one end in the housing.
Is connected to the pulley 11 via a belt 15 and is set to have a larger diameter than the pulley 11 on the input side. The first intermediate pulley 14 is provided. A second intermediate pulley 22 having a smaller diameter than the first intermediate pulley 14 is fixed to the intermediate shaft 22 coaxially with the first intermediate pulley 14. An output shaft 23 is provided at the tip of the housing, and the output shaft 23 has an output pulley 2 having the same diameter as the second intermediate pulley 22.
2a and a cutter disk 5 are attached. Second
The intermediate pulley 22 and the output side pulley 22a are connected to the belt 24.
Are connected via

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an improved engine cutter technology for cutting concrete, stone, brick, metal and other pipes.

[0002]

[Prior art]

 A handheld type portable engine cutter cuts concrete, stone, bricks, metal, and other pipes by rotating a cutter disk consisting of a disk-shaped grindstone through a rotational force transmission mechanism to the rotary shaft of the engine. It is a thing.

The engine body, which is the drive source of this type of engine cutter, is usually a small 2-cycle lubricating oil mixed gasoline engine, and its displacement is 70 CC or less so as not to hinder carrying. This engine body is combined with a fuel tank, air cleaner, centrifugal clutch mechanism, etc. to form an engine unit.This engine unit is also equipped with a housing that supports the rotation transmission mechanism and the cutter disk as a bearing. By attaching a handle, etc., it is easy to carry for workers, and has a lightweight and compact shape. By the way, the characteristics of a 2-cycle gasoline engine with a displacement of 70 CC or less are, of course, high rotation and low torque, and the torque is increased to some extent, and when the clutch is connected by the blowing up, the rotation transmission mechanism is used. I am trying to rotate the cutter disk.

On the other hand, the material to be cut is a hard material such as concrete or stone as described above, and since a high cutting torque is required, the rotation ratio is changed at the rotation transmission mechanism and the final output characteristic is reduced. It is necessary to convert to rotation and high torque.

Therefore, when the belt transmission mechanism is adopted as the rotation transmission mechanism, the pulley connected to the input shaft from the engine has a small diameter, and the pulley coaxially connected to the output shaft on the cutter disk side has a large diameter. By doing so, a large cutting torque can be obtained according to the diameter ratio, but there were the following technical problems.

[0006]

[Problems to be solved by the device]

 In other words, when the pulley diameter is increased, the maximum cutting amount of the cutter disk is the diameter of the cutter disk attached to the output shaft minus the pulley diameter coaxial with this, and the cutting range is greatly reduced. However, the cutting thickness will be limited.

It should be noted that other rotation transmission mechanisms can be considered in place of the combination of the belt and the pulley, but consideration should be given to the simplicity of the mechanism and the case where the cutter disk is caught in the work. Then, since the rotation transmission mechanism has to absorb the torque caused by the biting, the belt transmission mechanism is the most appropriate even if there are the above restrictions.

The present invention is to solve the above problems, and an object thereof is to provide an engine cutter capable of securing a large cutting amount of a cutter disk even when the final output characteristics are low rotation and high torque. I am trying.

[0009]

[Means for Solving the Problems]

 To achieve the above object, the present invention comprises a housing having one end connected to an engine unit, and an input side pulley located at one end side in the housing and connected to an input shaft from the engine unit. A first intermediate pulley that is axially coupled to an intermediate shaft bearing at an intermediate position of the housing, is connected to the input pulley via a belt, and has a diameter larger than that of the input pulley; A second intermediate pulley having a diameter smaller than that of the first intermediate pulley, which is integrated with the first intermediate pulley coaxially, and an output shaft bearing at the other end of the housing, and is coupled to the second intermediate pulley by a belt. An output side pulley having the same diameter and connected via a cutter disk, and a cutter disk detachably connected to a protruding end of the output shaft from the housing. The final output torque of the engine cutter thus configured is determined by the diameter ratio between the input side pulley and the first intermediate pulley of the intermediate shaft, and the output side pulley of the output shaft is coaxial with the first intermediate pulley. Since the diameter is the same as that of the second intermediate pulley, the cutting range of the cutter disk is the value obtained by subtracting the diameter of the output pulley from the diameter, and the cutting range can be made large. Each of the belts may be provided with tension adjusting means that can be adjusted by an external operation. As described above, the belt transmission mechanism has the function of slipping and absorbing torque when excessive torque is applied, but on the other hand, it may extend and impair proper torque transmission. Here, if this configuration is adopted, the tension adjustment by the elongation of the belt in such a case can be easily performed by the operator's hand. The cutter disc is covered at the other end of the housing by a cover that is fixed concentrically with the other end of the housing, and the lower outer periphery of the cutter disc is located inside the lower part of the cover. A movable cover that covers the can be housed so that it can appear and disappear. The cutter disc is naturally provided with a cover on the rear side supported by an operator for the safety of handling, but this cover also serves as a factor for limiting the cutting range of the cutter disc. Therefore, if this configuration is adopted, the cutting range can be adjusted while ensuring the safety by the movable cover. A dustproof plate may be detachably fixed to the lower portion of the housing. The cutter disk rotates while blowing chips to the lower half of the operator's side to protect the operator from dust. Therefore, by adopting this configuration, it is possible to prevent chips and sparks from scattering to the feet of workers.

[0010]

[Embodiment of the invention]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a side view of an engine cutter according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

In the figure, the engine cutter includes an engine unit 1, a main body housing 2 connected to one side of the engine unit 1 via a bolt, a front end housing 3 connected to a front end portion of the main body housing 2, and a front end housing. 3, a disk cover 4 integrated with the tip of the disk 3 and a cutter disk 5 that rotates while the latter half of the disk cover 4 is covered.

As described above, the engine unit 1 is a compact two-cycle lubricating oil mixing type gasoline engine (not shown), a gasoline tank, a centrifugal clutch mechanism, and the like, which are combined and housed in one case, and an air cleaner 6 is provided above the case. Is exposed.

Further, a rubber tube-covered first handle 7 having a substantially U shape and straddling over the engine unit 1 is provided on the upper front side of the engine unit 1, and on the rear side thereof, A second handle 8 extending rearward is integrally provided.

A pistol-type throttle lever 9 is arranged on the second handle 8, and a rope-type starter (not shown) is arranged at an appropriate position.

With this configuration, the operator holds the first grip 7 with one hand and holds the second grip 8 with one hand after starting the engine, and thereby the operator holds the cutter disk 5 while supporting the engine cutter. The cutting work can be performed by hitting the cut object and operating the throttle lever 9.

The main body housing 2 is made of a die-cast body having a split shape, and a small-diameter input side pulley 11 is connected to an input shaft 10 from the engine, which projects inward from the rear.

A bearing portion 13 is provided on the front end side of the main body housing 2, and both ends of an intermediate shaft 12 in which a first intermediate pulley 14 is connected thereto are supported. The first intermediate pulley 14 has a larger diameter than the input pulley 11 and is connected to the input pulley 11 via a V belt 15.

The diameter ratio of the intermediate pulley 14 to the input pulley 11 can be set in the range of 1: 1.5 to 1: 3, depending on the height limit inside the main body housing 2.

According to this configuration, the rotation ratio and the rotation torque of the intermediate shaft 14 with respect to the input shaft 10 become low speed and high torque according to the diameter ratio of the input side and the first intermediate pulleys 11 and 14.

On the other hand, the guide roller 16 is in contact with the inside of the upper portion of the V-belt 15 at a substantially intermediate position, and the tension adjusting roller 17 is in contact with the inside of the lower portion thereof.

The tension adjusting roller 17 is rotatably supported by the tip of an arm 19 which is swingably supported by a fulcrum portion 18 as a base point. The arm 19 swings along the guide block 20 and also swings according to the screwing amount of the tension adjusting bolt 21 protruding to the lower portion of the main body housing 2.

FIG. 1 shows a state in which the V belt 15 is stretched to the innermost side. By rotating and adjusting the adjusting bolt 21 from this state, the V-belt 15 is expanded outward and its optimum tension is adjusted.

A second intermediate pulley 22 coaxial with the first intermediate pulley 14 is integrally formed on the upper end surface side of the first intermediate pulley 14. The second intermediate pulley 22 has a smaller diameter than the first intermediate pulley 14.

On the other hand, a bearing output shaft 23 is provided on the tip side of the tip housing 3 projecting from the other end of the main body housing 2. An output side pulley 22a having the same diameter as the second intermediate pulley 22 is axially connected to the output shaft 23, and the two pulleys 22 and 22a are connected to each other by a V belt 24 so as to rotate at the same torque and torque. .

According to this structure, the width of the tip housing 3 can be made considerably narrower than that of the main body housing 2 according to the pulley diameter, and the center of the cutter disk 5 attached to the tip of the output shaft 23 can be thereby made. The cutting range on the side can be widened.

The tip housing 3 is fixed to a connecting block 25 fixed to the tip of the main body housing 2 via a pair of mounting bolts 26, and a bearing portion 27 for bearing the output shaft 23 is formed at the tip. It comprises a bearing plate 28 and a housing cover 29 that covers the back surface of the bearing plate 28.

The bolt insertion hole 25a of the connection block 25 is formed in a long hole shape in the belt tension direction, and is provided on the outer side of the bearing plate 28 as shown in FIG. A tension adjusting bolt 30 with a rotating hole, whose head is in contact with the tip of the body housing 2, is screwed in. By rotating the adjusting bolt 30 to move the tip housing 3 forward and backward with respect to the body housing 2, The tension of the belt 24 is adjusted.

The cover 4 is fixed around the bearing portion 27 of the bearing plate 28, and a movable cover 31 is provided so as to be retractable on the inner periphery of the lower side thereof.

As described above, the cover 4 ensures the safety of the operator, but this also limits the cutting range of the cutter disk 5. Therefore, the range can be increased or decreased depending on the amount of protrusion of the movable cover 31.

The movable cover 31 is always urged toward the protruding side by the urging force of a spring or the like, and the movable cover 31 contacts the object to be cut according to the cutting depth of the cutter disk 5. It can be configured so that it automatically retracts, or it can be semi-fixed, and the amount of protrusion can be adjusted by the operator.

Further, a dustproof plate 32 is vertically provided at the bottom of the main body housing 2. The dustproof plate 32 is made of, for example, a rubber plate, and by rotating the cutter desk 5 in the clockwise direction shown by the arrow in FIG. 1, chips and sparks from the object to be cut flow toward the feet of the operator. It has the function of blocking workers and protecting workers.

[0032]

[Effect of the invention]

 As is clear from the above description, the present invention has the following effects. Even if you use a small engine, you can rotate the cutter disk with high torque, and because the cutting range of the cutter disk can be widened, it is suitable for cutting objects such as concrete, stone materials, longs, metal and other pipes. Is. According to the structure of claim 2, the tension adjustment due to the stretching of the belt can be more easily performed by the operator's hand. According to the structure of claim 3, the movable cover can adjust the cutting range while ensuring safety. According to the structure of claim 4, the dustproof plate can prevent cutting chips and sparks from scattering to the feet of the worker.

[Brief description of the drawings]

FIG. 1 is a side view of an engine cutter according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

1 Engine Unit 2 Main Body Housing 3 Tip Housing 4 Cover 5 Cutter Disc 10 Output Shaft 11 Input Side Pulley 12 Intermediate Shaft 14 First Intermediate Pulley 15, 24 V Belt 22 Second Intermediate Pulley 22a Output Side Pulley 23 Output Shaft 17, 18, 19, 20, 21 Body housing side belt tension adjusting means 25a, 26, 30 Tip housing side belt tension adjusting means 31 Movable cover 32 Dustproof plate

Claims (4)

[Utility model registration claims] 1. A housing having one end connected to an engine unit, an input pulley located at one end in the housing and connected to an input shaft from the engine unit, and a bearing at an intermediate position of the housing. A first intermediate pulley that is axially coupled to the intermediate pulley, is connected to the input pulley via a belt, and has a diameter larger than that of the input pulley; and is integrally coaxial with the first intermediate pulley. A second intermediate pulley having a smaller diameter than the first intermediate pulley, and an output having the same diameter, which is axially coupled to an output shaft bearing at the other end of the housing and is connected to the second intermediate pulley via a belt. An engine cutter comprising: a side pulley; and a cutter disk detachably connected to a protruding end of the output shaft from the housing. 2. The engine cutter according to claim 1, wherein each of the belts is provided with tension adjusting means that can be adjusted by an external operation. 3. The cutter disk has a cover fixed concentrically to the other end of the housing at a substantially rear half of the periphery thereof, and the cutter disk is provided inside the lower portion of the cover. The engine cutter according to claim 1, wherein a movable cover that covers a lower outer periphery of the disc is housed so as to be retractable. 4. A dustproof plate is detachably fixed to a lower portion of the housing.
The listed engine cutter.