JP3031955U - Power transmission device for portable engine cutter - Google Patents

Abstract

(57) [Abstract] [Problem] Due to a large reduction ratio and a large cutting depth for optimum cutting speed, the cutting performance is excellent, the waterproof seal is complete and reliable, and the simple structure is light and convenient to carry. In addition, a power transmission device for a portable engine cutter that can perform cutting work near the wall or just near the surface is obtained. SOLUTION: A large reduction ratio is achieved as a drive shaft power transmission mechanism for two-step reduction with only a bevel gear from an engine output shaft to a main shaft, and a large cutting depth and a complete waterproof seal are possible as a sealed small diameter headstock. As a drive mechanism with a simple structure, it is possible to reduce the size and weight, and the headstock can be swiveled around the centerline of the drive shaft of the frame tube and held by the bearing on the frame tube and clamped by the clamp bolt. However, as a method of fixing the turning, it is possible to turn the cutter to a position close to the wall or just near the surface.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention transmits the rotation of the engine to the cutter by interlocking the output shaft of the engine and the main shaft equipped with the disc-shaped cutter by an arbitrary driving means, and by rotating the cutter, cast iron, concrete, stone materials, etc. The present invention relates to a power transmission device of a portable engine cutter used for cutting.

[0002]

[Prior art]

 Conventionally, this type of power transmission device has a V-pully (d) installed on a clutch shaft (c) that is connected to an output shaft (a) of an engine and a clutch part (b) as shown in FIG. The output shaft of the engine is attached to the cutter (h) that is connected to the V-pully (f) installed on the main shaft (g) and the V-belt (e) and covered with the V-belt cover (d) and fixed to the main shaft (g). A small spur gear (nu) is installed on the one that transmits the rotation of (a) or on the clutch shaft (c) that is connected with the output shaft (a) of the engine and the clutch part (b) as shown in FIG. A bevel gear (L) is integrally formed on the side surface and meshes with a large spur gear (W), and a drive shaft (F) is formed at both ends to form a bevel gear (W, Y), and a bevel gear at one end ( (Wa) meshes with the bevel gear (Le), and the bevel gear (Yo) at the other end meshes with the bevel gear (Ta) installed on the main shaft (G) and is fixed to the main shaft (G). A motor (h), there has been known one which transmits the rotation of the output shaft of the engine (A). (See Japanese Utility Model Laid-Open No. 4-79015)

[0003]

[Problems to be solved by the device]

 In the former of those described in the prior art, although the structure is simple, in order to increase the reduction ratio, it is necessary to increase the V pulley diameter installed on the cutter spindle, and the cutter diameter and V Since the cutting depth determined by the difference in pulley diameter becomes small, the deceleration ratio is limited, and it becomes difficult to obtain the optimum cutting speed of the cutter, and the V-belt cover is difficult to waterproof, so the V-belt is difficult. When the cutter is required to be brought close to the wall or just near the surface of the ground by cutting work, water will be splashed on the surface and the belt slips frequently, and in order to reverse the direction of the cutter, disassemble and replace the spindle and the belt cover. Not only the work was required, but there was a problem that it was impossible to orient the cutter horizontally.

Further, in the latter case, although a large reduction ratio can be obtained and a waterproof seal can be easily obtained, the structure is complicated and the number of parts is large, resulting in an increase in weight and an inconvenience for carrying, which is a problem. There was a problem that it was not possible to cut the cutter by bringing it close to the wall or just near the surface because the direction of the cutter did not change.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to obtain a large reduction ratio that provides an optimum cutting speed and to cut well, With a large depth and excellent cutting ability, the power transmission device has a good waterproof seal even with a simple structure, it does not break down even if it gets dusty or dirty, it is light and convenient for carrying. In addition, it aims to provide a power transmission device for a portable engine cutter, which has excellent workability and allows the cutter to be freely changed in direction by simple operations, enabling cutting work near the wall or the surface. is there.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the power transmission device of the present invention has a large reduction ratio from the engine output shaft to the main shaft, and can reduce the outer diameter. By installing a bevel gear with a small outer diameter on the main shaft, the head stock diameter that supports the main shaft is made small, and the cutting depth of the cutter determined by the difference between the cutter diameter and the head stock diameter is made large, as well as optimum cutting. It is designed so that a large deceleration ratio up to the speed can be obtained.

Further, a bevel gear is installed on a clutch shaft which is connected to an engine output shaft by a clutch unit, and meshes with one bevel gear of a drive shaft having bevel gears installed on both ends, and the other bevel gear is used as a main shaft. As a simple structure that transmits the rotation of the output shaft of the engine to the main shaft simply by engaging with the installed bevel gear, the weight is reduced and the bevel gear drive shaft transmission system is adopted to make it convenient to carry, and the headstock and This is a structure of a drive unit that completely seals with a frame tube and a clutch case to prevent troubles due to dust and dirty water.

Further, the headstock holding the main shaft to which the cutter is attached is held on a frame tube holding the drive shaft by a bearing so as to be rotatable about the centerline of the drive shaft, and installed on the headstock. The clamp bolt is clamped to the indexing clamp seat installed on the frame tube to fix the swivel, and the direction of the cutter can be moved to the position near the wall or the surface of the ground just by tightening and loosening the clamp bolt. It is designed so that it can be freely turned over and fixed.

[0009]

[Embodiment of device]

 Embodiments of the invention will be described with reference to the drawings. 1 to 4, a disc-shaped cutter 1 is attached to a tip of a spindle 7 in a center hole in a fitted state, narrowed from both sides by an inner flange 3 and an outer flange 4, and clamped by a flange bolt 5. As a result, the power from the main shaft 7 is transmitted, the boss hole is slid into the outer diameter of the tip of the headstock 8, and both sides of the boss are sandwiched between the cover plate 6 and the headstock 8. On the other hand, the semi-circumference is covered by the attached protective cover-2.

A main shaft 7 having a cutter 1 fixed at its tip is supported by bearings 9 and 10 on a headstock 8, a bevel gear 39 is installed between the shafts via a key 11, and the bevel gear 39 is driven. It meshes with a bevel gear 13 installed at one end of the shaft 15 via a key 14 so that the power of the drive shaft 15 is transmitted.

The headstock 8 supports the main shaft 7 with bearings 9 and 10, seals the main shaft 7 with a cover plate 6 and a cover 12, and bevel gears 13 and 23 are provided at both ends of the headstock 8 and keys 14 and 33, respectively. The drive shaft 15 installed via the drive shaft 15 to the outer diameter of one end of the frame tube 20 held by the bearings 22 and 37, and the bearings 16 and 17 with the drive shaft center line A as the shaft. Is held so that it can be swung while biting, the headstock 8 is sealed with the cover 21 and the clamp bolt 19 installed on the cover 21 is installed on the outer circumference of the frame tube 20 to form the index clamp seat. The headstock 8 can be fixed at a position where it is swung to the required angle by tightening it to 18.

The bevel gear 23 installed on the other end of the drive shaft 15 via a key 33 is installed via a clutch shaft 28 hex 32 that is connected to the output shaft 30 of the engine by a clutch unit 29. It meshes with the bevel gear 27, which is transmitted to the drive shaft 15, from the clutch output shaft 28 to the drive shaft 15.

The clutch case 24 supports a clutch shaft 28 with bearings 25 and 31, and an output shaft 30 and a clutch portion 29 with a bearing 34, and is installed on the clutch shaft 28 via a key 32. The bevel gear 27 is fixed to the frame tube 20 supporting the drive shaft 15 so that the bevel gear 27 engages with the bevel gear 23 installed at one end of the drive shaft 15 via the key 33. -26 and 35 are mounted and hermetically sealed, the cover 35 is fixed to the engine body 38 with the bolt 36, and the clutch case 24 is mounted to the engine body 38.

[0014]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

In the power transmission device of the portable engine cutter according to the first aspect, since the main shaft is driven by the bevel gear from the drive shaft, a large reduction ratio can be obtained with a small bevel gear diameter, and accordingly, outside the headstock. Since the diameter is smaller, it can be decelerated to the optimum cutting speed for better sharpness, the cutting depth determined by the difference between the cutter diameter and the headstock outer diameter can be increased, the cutting ability is improved, and the cutter mounting part at the tip of the spindle is improved. Other than that, the headstock, which has a closed shape only when exposed, has a structure that is easy to seal and can withstand an environment where it is exposed to dust and dirty water, has few failures and improves reliability, and is installed on the headstock. The direction of the cutter can be freely changed only by operating the clamp bolt and unclamp, so it is possible to perform cutting work near the wall or on the surface of the ground, improving workability. .

In the power transmission device for the portable engine cutter according to claim 2, since the main shaft is driven by the bevel gear from the drive shaft, a large reduction ratio can be obtained with a small bevel gear diameter, and accordingly, the headstock. Since the outer diameter is smaller, the cutting speed can be reduced to the optimum cutting speed, the sharpness improves, and the cutting depth determined by the difference between the cutter diameter and the headstock outer diameter can be increased, improving the cutting ability and improving the cutting speed of the spindle tip. The headstock, which is otherwise sealed only by exposing the mounting part, is easy to seal, and the power transmission mechanism is completely sealed together with the frame tube and clutch case to withstand the environment exposed to dust and dirty water. Since there are few malfunctions and reliability is improved, bevel gears are installed on the clutch shaft that is connected to the engine output shaft and the clutch unit, so that both ends are bevel gears. The bevel gear on one of the drive shafts installed on the main shaft and the other bevel gear on the main shaft are simply meshed with the bevel gear, so the structure is simple and the number of parts is small. It is light and convenient to carry, improving operability.

In the power transmission device for the portable engine cutter according to claim 3, since the main shaft is driven from the drive shaft by the bevel gear, a large reduction ratio can be obtained with a small bevel gear diameter, and therefore the headstock outer diameter can be reduced. Since it becomes smaller, it can be decelerated to the optimum cutting speed and the sharpness improves, the cutting depth determined by the difference between the cutter diameter and the headstock outer diameter can also be increased, the cutting ability improves, and the cutter attachment part at the tip of the spindle is exposed. The other is a closed headstock that is easy to seal, and the power transmission mechanism together with the frame tube and the clutch case should be completely sealed so that it can withstand the environment exposed to dust and dirty water. Since it is possible to reduce the number of failures and improve reliability, the direction of the cutter can be freely changed only by operating the clamp and clamp of the clamp bolt. Cutting work can be done with improved cutting efficiency, and bevel gears are installed on the clutch shaft that is connected to the engine output shaft by the clutch part that is connected by the clutch part. The structure of the power transmission device is simple because it meshes with one bevel gear on the drive shaft, and the other bevel gear only meshes with the bevel gear installed on the main shaft, so the structure is simple, the number of parts is small, and the weight is small. It is light, convenient to carry and has improved operability.

[Brief description of drawings]

FIG. 1 is a plan view showing a cross section of a main part of a power transmission device of a portable engine cutter.

FIG. 2 is a side view showing a cross section of a main part of a power transmission device of a portable engine cutter.

3 is a detailed cross-sectional view of the head stock portion of FIG.

FIG. 4 is a detailed cross-sectional view of the clutch case portion of FIG.

FIG. 5 is a cross-sectional view of a main part of a conventional power transmission device for a portable engine cutter.

FIG. 6 is a cross-sectional view of a main part of a conventional power transmission device for a portable engine cutter.

[Explanation of symbols]

 101 Headstock 102 Clutch case A Drive shaft center line 1 Cutter 2 Protective cover 3 Inner flange 4 Outer flange 5 Flange bolt 6 Cover plate 7 Spindle 8 Headstock 9 Bearing 10 Bearing 11 Key 12 cover 13 bevel gear 14 key 15 drive shaft 16 bearing 17 bearing 18 indexing clamp seat 19 clamp bolt 20 frame tube 21 cover 22 bearing 23 bevel gear 24 clutch case 25 bearing 26 cover 27 bevel gear 28 Clutch Shaft 29 Clutch Part 30 Output Shaft 31 Bearing 32 Key 33 Key 34 Bearing 35 Cover 36 Bolt 37 Bearing 38 Engine Main Body 39 Bevel Gear

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[Procedure amendment]

[Submission date] June 24, 1996

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

Claims (3)

[Scope of utility model registration request] 1. A main shaft (7) having a cutter (1) attached at one end and a bevel gear (39) fixed between the shafts, bearings (9, 10) and a main shaft (7) for holding the main shaft (7). A headstock (8), a drive shaft (15) in which bevel gears (13, 23) are installed at both ends and the bevel gear (13) at one end is meshed with the bevel gear (39); A frame formed by a bearing (22, 37) for holding 15) and a drive shaft (15).
A frame tube (2) is provided so that the tube (20) and the headstock (8) can be swiveled around a drive shaft center line (A).
0) bearings (16, 17), the headstock (8) is rotated to the required indexing angle, and then clamped in place to clamp the headstock (8). A power transmission device for a portable engine cutter, which comprises an indexing clamp seat (18) installed on a mutub (20). 2. A bevel gear (27) is installed on a clutch shaft (28) connected to an output shaft (30) of the engine by a clutch portion (29), and bevel gears (13, 23) are installed on both ends. Bite with the bevel gear (23) at one end of the drive shaft (15),
A power transmission device for a portable engine cutter, characterized in that a bevel gear (13) at the other end meshes with a bevel gear (39) fixed to a main shaft (7). 3. The main shaft (7) of the headstock (8) constituted by the turning indexing mechanism according to claim 1, is driven from the output shaft (30) of the engine by the power transmission mechanism according to claim 2. A power transmission device for a portable engine cutter, wherein the power transmission device is a main shaft (7).