KR102517619B1 - Device for power transmission - Google Patents

Abstract

The present invention proposes a power transmission device that can be selectively mounted on the main body of a lawnmower. The power transmission device of the present invention includes a driven shaft 10 that can be coupled with the drive shaft 2 to receive power; It is supported at a predetermined position outside the driven shaft 10 so as to surround the driven shaft 10 and includes a fixed cylindrical body 20. The inner fixing cylinder 30 is coupled to the outside of the fixing cylindrical portion 20 so as to surround the fixing cylindrical portion 20, and the conical cylinder 50 is coupled to the outside of the inner fixing cylinder 30, The outer side has an inclined surface 52 having a high inclination. The first adjusting ring 40 elastically deforms the elastic piece 35 of the inner fixing cylinder 30 outward by the trumpet-shaped portion 24 of the fixing cylinder 20 . And the second adjusting ring 42 presses the conical cylinder 50 inward by axial movement. Therefore, the elastic piece 35 is in close contact with the casing 40 inside the output casing 4 and the conical cylinder 50 is inside the inlet of the output casing 4, so that the casing 4 is supported on

Description

Power transmission device for lawnmower {Device for power transmission}

The present invention relates to a power transmission device for a lawnmower, and more particularly, to a power transmission device for grinding rotary blades of a lawnmower by rotating an abrasive wheel using an output shaft of a lawnmower main body in which a driving source is embedded. , For example, it relates to a power transmission device for a lawnmower configured to grind and use damaged rotary blades in the field when a grinder for grinding rotary blades of a mower is connected.

Korean Patent Publication No. 2002-0062686 may be mentioned as one of the prior art for lawnmowers that have various specifications and are currently on the market. Looking at the technical content of these prior patent documents, it is common to consist of a lawnmower body with a built-in power source such as an engine, a rotational shaft connected to the output of the lawnmower body, and a rotary blade installed at the end of the rotational shaft and cutting an object. am.

Various types of rotary shafts that transmit rotational power generated from a power source built into the main body of the lawnmower to the rotary blade have been developed, and various types of rotary shafts have been developed and are currently on sale. However, in the case of using such a brush cutter, although the object in contact with the rotary blade is soft such as grass, in practice, there are many cases where the rotary blade is damaged by small stones or strong trees.

In the case of currently used mowers, it can be said that it is practically impossible to restore a rotary blade damaged by a cutting object in the field. Therefore, when there is a lot of work, it can be said that there is a concern about the disadvantage that may cause very difficult cases with the current grass clipper.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power transmission device for a lawnmower capable of transmitting rotational power of a lawnmower main body having a driving source to another external device.

Another object of the present invention is to provide a power transmission device for a lawnmower body configured to transmit the output of a lawnmower body to the outside even when the size of a casing in which an output shaft is installed does not match.

Another object of the present invention is to provide a rotary blade polishing device for a brush cutter that enables the rotary blade to be reused by polishing the rotary blade using the rotational force of a power source built into the brush cutter body.

The device of the present invention is a power transmission device installed in the main body of the lawnmower and detachably mounted to an output unit casing having a driving shaft therein, a driven shaft capable of receiving power by being coupled with a driving shaft, and wrapped around the driven shaft. It is supported at a predetermined position outside the driven shaft, and includes a fixed cylindrical body in which a trumpet-shaped part is molded on the inner part and a screw thread is molded on the outer part.

In addition, the inner fixing cylinder is coupled to the outside of the fixing cylinder so as to surround the fixing cylinder, and a plurality of elastic pieces formed by a plurality of slits are molded in a portion corresponding to the trumpet shape, and a screw thread is formed on the outer portion. The conical cylinder is coupled to the outside of the inside fixing cylinder and has an inclined surface having a high slope on the outside. Here, the first adjusting ring is screwed into the screw thread of the outer portion of the fixing cylinder, and can linearly move in the axial direction of the fixing cylinder by rotation, and fixes the elastic piece of the inner fixing cylinder by this axial movement. It is elastically deformed outward by the trumpet-shaped part of the cylindrical body. And the second adjusting ring is screwed at the outer portion of the inner fixing cylinder and can move linearly in the axial direction of the inner fixing cylinder by rotation, and presses the conical cylinder inward by this axial movement. Therefore, in the power transmission device of the present invention, the elastic piece can be detachably supported on the casing by adhering to the casing inside the output casing and the conical cylinder inside the inlet of the output casing.

According to another embodiment of the present invention, it is configured to further include a grinder detachably installed at the outer end of the driven shaft.

According to another embodiment of the present invention, the slit is formed in a direction inclined at a predetermined angle with respect to the horizontal direction.

According to the present invention having the configuration as described above, a flexible cable for transmitting power for mowing may be installed in the output casing of the lawnmower main body, and after separating the flexible cable, the power transmission device of the present invention is selectively installed. You can see that it is possible to install it with . Since the detachably mounted power transmission device of the present invention has a structure that can be firmly coupled to the lawn mower body and can be rotated by a driving source, it can be used for other parts requiring power. For example, by installing a grinder at the outer end of the power transmission device, it is possible to expect an action effect that can be reused by grinding a damaged or dull rotary blade.

1 is an exemplary view showing the configuration of an output part of a grass cutter body;
2 is an exemplary cross-sectional view of a power transmission device of the present invention using an output shaft of a lawnmower.
Figure 3 is an exemplary view of a state in which the main part of the power transmission device of the present invention is partially separated.

Next, the present invention will be described in more detail based on the embodiments shown in the drawings.

1 is an exemplary view showing a part (output unit) of a main body of a lawnmower to use the polishing device of the present invention. The lawnmower of the present invention has an engine or a motor built-in as a drive source, and is provided with an output shaft 2 for transmitting output from the drive source to an external device. The output shaft 2 is installed inside the output casing 4, and the portion of the casing 4 where the output shaft 2 is installed actually has an open state.

In addition, the output shaft 2 may have any configuration as long as the rotational output can be connected to an external connection device, and, as in the illustrated embodiment, it is typically provided with a rectangular output groove 2a at the front. there is. Therefore, if it is inserted into the rectangular output groove 2a of the output shaft 2 and can be connected to an external device that can rotate in conjunction with the output shaft 2, it is expected to sufficiently transmit power to the outside.

In this way, the present invention focuses on the fact that the output of the drive source built into the lawnmower main body can be transmitted to the outside through the output shaft 2. That is, the power transmission device receiving power must be supported so that it can be stably coupled to the output shaft 2 of the lawnmower main body. In the present invention, it can be stably supported through the inner surface of the output unit casing 4 and at the same time , Even if the size of the inner diameter of the output unit casing 4 is somewhat different, it is focused on being sufficiently installed.

Next, referring to FIG. 2, the power transmission device will be described in more detail. As shown, the inner end 12 of the driven shaft 10 is coupled while being inserted into the rectangular output groove 2a of the output shaft 2, so that rotational power of the output shaft 2 can be transmitted. For example, a grinder 64 is installed at the outer end of the driven shaft 10, and the grinder 64 rotates in conjunction with the rotation of the driven shaft 10, rotating the damaged mowing machine as necessary. You can sharpen the blade.

Immediately outside the driven shaft 10, a fixed cylindrical body 20 is fixed at a predetermined position. Here, the stationary cylindrical body 20 can substantially perform a function of rotatably supporting the driven shaft 10, and a bearing may be installed if necessary to support the rotating driven shaft 10. Of course. The fixed cylindrical body 20, for example, the flange 14 protruding over the entire circumference of the driven shaft 10 is formed on the inner surface of the fixed cylindrical body 20 by the locking jaw 22 formed on the inner side. In a state where the movement is restricted in the direction (left side in the drawing), the fixed position is maintained by the stop ring 14 installed on the driven shaft 10 so that the outer end of the fixed cylindrical body 20 comes into contact with it.

And it has a shape widening to the trumpet-shaped portion 24 forming the inner end of the fixed cylindrical body 20. A screw thread is formed on the outer portion 23 (right portion in the drawing) of the fixed cylindrical body 20, so that it can be screwed into the inner surface of the first adjusting ring 40. That is, a male thread is formed on the outer end of the fixed cylindrical body 20, and a female thread is formed on the inner surface of the first adjusting ring 40, so that the first adjusting ring 40 is formed on the inner surface of the first adjusting ring 40. It is screwed to the outer part 23 of the. And the first control ring 40 performs linear motion in the left and right directions (axial direction) by rotation, and in order to facilitate the rotation of the first control ring 40, a number of (for example, Three) handles 40a are provided.

In addition, an inner fixing cylinder 30 is coupled to the outside of the fixing cylinder 20 having such a configuration. The inner fixing cylinder 30 has a shorter length than the aforementioned fixing cylinder 20, and its inner end is the inlet portion of the trumpet-shaped part 24 of the fixing cylinder 20 (the right side of the trumpet-shaped part in the drawing). part) or the middle part. As can be seen in FIG. 3, since a plurality of slits 32 starting from the inner end 34 are molded near the inner end 34 of the fixed cylindrical body 20, the portion between the slits 32 is an elastic piece 35 ), and the elastic piece 35 can be elastically deformed outward (radially).

If the slit 32 is molded to have a certain inclination with respect to the horizontal as shown in the figure, rather than being molded in the horizontal direction, the length of the elastic piece 35 is substantially longer, thereby reducing the degree of elastic deformation. Expect to be able to make it even bigger. When the elastic piece 35 elastically deforms radially outward, it adheres to the inner surface of the casing 4 shown in FIG. 1 so that the power transmission device of the present invention can be supported on the inner surface of the casing 4 .

A conical cylinder 50 is coupled to the outside of the inner fixing cylinder 30 . The outside of the conical cylinder 50 has a conical shape with an inclined surface 52 that rises further toward the outside (right side in the drawing). Here, the inclined surface 52 is molded in a direction increasing toward the outside (right side in the drawing). And the conical cylinder 50 also has the slit 54, so that it can elastically deform radially inward and outward.

In addition, a second adjusting ring 42 is screwed to the outer portion of the inner fixing cylinder 30 . When the second control ring 42 is rotated by an external force received through the handle 42a, the second control ring 42 makes a linear motion in the left and right directions in the inner fixing cylinder 30. Here, the leftward movement of the inner fixing cylinder 30 will substantially move the conical cylinder 50 to the inside of the casing 4 .

A grinder 64 is coupled to the outside of the driven shaft 10 and rotates according to the rotation of the driven shaft 10 . Therefore, the user will be able to grind and reuse the rotary blade damaged during the manufacturing operation. Of course, various configurations are possible for fixing the grinder 64, but in the illustrated embodiment, a configuration using a screw thread formed near the outer end of the driven shaft 10 is adopted. A screw thread is formed on the outer portion of the driven shaft 10, and the first fixing nut 61 is screwed to the outside of the stop ring 69 supported by the pin 68, for example. After the grinder 64 is coupled, a second fixing nut 62 is screwed to the outside of the grinder 64 . Therefore, when the first fixing nut 61 and the second fixing nut 62 are screwed and fixed to the right side of the driven shaft 10, it is natural that the grinder 64 therebetween will also be securely fixed.

In addition, it is advantageous to prevent any movement caused by an external force by interposing a spring (S) between the first control ring 40 and the second control ring 42 operated by the user. As shown in Figure 2, the spring (S) is supported while being inserted into the spring support grooves (40s, 42s) formed in the first control ring 40 and the second control ring 42 facing each other, respectively there is. The elastic force of the spring (S) is applied to the first control ring 40 and the second control ring 42, respectively, to prevent unnecessary operations such as random rotation.

Next, the operation of the power transmission device of the present invention having the above configuration will be described. The inner part of the power transmission device shown in FIG. 2 is inserted into the casing 4 of the output unit of the lawnmower shown in FIG. 1. The inner end 12 of the driven shaft 10 is coupled to the output groove 2a of the output shaft 2 to be in a state in which it can rotate in conjunction with each other. And, in order to firmly maintain this connected state, the power transmission device contacts the casing 4 at two places so that the state can be firmly maintained.

The elastic piece 35 formed at the inner end of the inner fixing cylinder 30 is located at the position A inside the output casing 4, and the conical cylinder 50 is at the entrance of the casing 4. It is located on the inner side (B). In this state, when the user rotates the first adjusting ring 40 using the handle 40a and moves it to the left in the drawing, the inner fixing cylinder 30 receives a force directed to the left, and the fixing cylinder 20 The elastic piece 35 at the inner end is spread outward (radially outward) by the trumpet-shaped portion 24 of ). The elastic piece 35 widened in this way comes into contact with the inner surface of the casing 4 at the first position (A) on the inner surface of the output unit casing 4 and is firmly fixed with a large frictional force.

And, when the user rotates the second adjusting ring 42 screwed to the outside of the inner fixing cylinder 30 using the handle 42a and moves it to the left in the drawing, the conical cylinder 50 is also the same. While receiving force in the direction (or moving slightly while receiving force), it firmly adheres to the second position B inside the inlet of the casing 4. Therefore, it can be said that the power transmission device of the present invention has a state in which it is sufficiently fastened by frictional force while being in close contact with the inside of the casing 4 at two locations (A and B).

At the position (A), which has entered a certain depth in the casing, the elastic part 35 of the inner fixing cylinder 30 spreads outward and adheres to the inner surface of the casing 4 to maintain the fixed position. And at the position (B) inside the inlet of the casing (4), the conical cylinder (50) is forced inward (right side in the drawing) by the second control ring (42). That is, as the second adjusting ring 42 screwed to the outer surface of the inner fixing cylinder 30 is rotated by the manipulation of the handle 42a, the second adjusting ring 42 moves inside (right side in the drawing). As it moves, it can be seen that the inclined surface 52 of the conical cylinder 50 adheres to the inner surface of the inlet of the casing 4 and maintains its position.

According to the present invention, the elastic piece 35 of the inner fixing cylinder 30 and the inclined surface of the round-shaped cylinder 50 are brought into close contact with each other at the inside and entrance of the casing 4, and thus the power of the present invention It can be seen that the delivery device is configured to be firmly supported by being mounted on the casing 4 of the output unit of the mowing machine. And in the state supported by the main body of the lawnmower in this way, the grinder 64 installed outside the power transmission device can rotate through the driven shaft 10, and the user can use it to regenerate a damaged or dull rotary blade. You will be able to.

2 ..... output shaft
2a ..... output groove
10 ..... Follower shaft
20 ..... fixed cylinder
30 ..... Cylinder for fixing inside
32 ..... slit
34 ..... Inner end
35 ..... elastic
40 ..... 1st adjustment ring
42 ..... 2nd adjusting ring
50 ..... Conical cylinder
52 ..... Slope

Claims (3)

As a power transmission device installed in the main body of the lawnmower and detachably mounted to the output unit casing 4 having the driving shaft 2 therein;
A driven shaft 10 coupled to the drive shaft to receive power;
A stationary cylindrical body 20 supported at a predetermined position outside the driven shaft 10 so as to surround the driven shaft 10, a trumpet-shaped portion 24 formed on the inner portion, and a screw thread molded on the outer portion 23 ;
A plurality of elastic pieces 35 formed by a plurality of slits 32 are coupled to the outside of the fixed cylindrical portion 20 so as to surround the fixed cylindrical portion 20, and a portion corresponding to the trumpet-shaped portion 24 is formed. A cylinder 30 for fixing the inner side of which a screw thread is formed on an outer portion thereof;
A cone-shaped cylinder 50 coupled to the outside of the inner fixing cylinder 30 and having an inclined surface 52 having an inclination increasing toward the outside;
It is screwed into the screw thread of the outer portion 23 of the fixed cylinder control 20, and can be linearly moved in the axial direction of the fixed cylinder 20 by rotation, and by this axial movement, the inner fixing cylinder 30 a first adjusting ring 40 that elastically deforms the elastic piece 35 of the outside by the trumpet-shaped portion 24 of the fixing cylindrical body 20; and
It is screwed at the outer part of the inner fixing cylinder 30 and can move linearly in the axial direction of the inner fixing cylinder 30 by rotation, and presses the conical cylinder 50 inward by this axial movement. It consists of a second adjusting ring 42;
The elastic piece 35 is inside the casing 4 of the output unit, and the conical cylinder 50 is inside the inlet of the casing 4 of the output unit, so that the casing 4 is in close contact with the casing 4. A power transmission device of a mowing machine, characterized in that supported.
According to claim 1,
A power transmission device of a brush cutter further comprising a grinder 60 detachably installed at an outer end of the driven shaft 10.
According to claim 1,
The slit 32 is a power transmission device of a brushcutter formed in a direction inclined at a predetermined angle with respect to the horizontal direction.

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