KR101403963B1

KR101403963B1 - Bearing unit for protecting cover of brush cutter

Info

Publication number: KR101403963B1
Application number: KR1020120039454A
Authority: KR
Inventors: 이명규
Original assignee: 주식회사 세원엔프라
Priority date: 2012-04-17
Filing date: 2012-04-17
Publication date: 2014-06-10
Also published as: KR20130116964A

Abstract

The present invention provides a bearing unit for a mowing machine safety plate in which bearings can be easily exchanged and the blade can be stably rotated without shaking. The bearing unit includes a bearing portion having a cylindrical portion for supporting the drive shaft and a bearing for holding the bearing portion while fixing the bearing portion and having a male thread formed at the end of the cylindrical portion, a bearing inserted into the bearing portion of the bearing portion, And the bearing and the bearing fixing portion are screwed to each other at an upper portion of the bearing. Accordingly, when the bearing is replaced, the bearing fixing portion can be rotated from the bearing by screwing, so that the bearing can be easily replaced. Further, since the bearing and the bearing fixing portion are securely fixed by screw engagement irrespective of the rotation of the drive shaft, the bearing unit can be firmly brought into close contact with the work table, and the blade can be stably rotated.

Description

{Bearing unit for protecting cover of brush cutter}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing unit, and more particularly, to a bearing unit for a safety plate mounted in a safety plate of a lawn mower used for performing a mowing operation.

The lawn mower is a device that performs mowing work on weeds and vines by the principle that the blade is rotated at a high speed by receiving power from a driving source such as a motor or an engine. In most of these lawn mowers, a blade is installed on a driving shaft receiving power generated from a driving source such as a motor or an engine, and the weeds, the vine, and the small branches are cut by the rotation of the blade coupled with the driving shaft. The mowing operation is performed by rotating the blade around the ground, so that it is important to rotate the blade stably in the mowing environment.

On the other hand, the drive shaft receives a load acting on the shaft, and a bearing for smoothly rotating the shaft is mounted. However, in the case of the conventional lawn mower disclosed in Korean Utility Model Application No. 20-2011-0009288, when the bearing, which is a consumable item, is forcibly inserted into the bearing when the bearing is replaced, or when the bearing is forcedly inserted by the stop ring or the like, It is difficult for a general user to replace the bearing. In the case of a structure in which the drive shaft and the bearing are integrated as another lawn mower, the drive shaft is broken when the bearings are separated. Therefore, according to the structure of the conventional lawnmower, it is difficult to separate and replace the bearing from the drive shaft.

In order to solve the above problems, there is disclosed a bearing unit structure in which bearings are inserted or separated while a bearing is provided in a drive shaft. However, in this case as well, the bearing unit is moved as the drive shaft rotates, there was. In other words, since the bearing unit is not firmly fixed to the work table and the blade is shaken, the rotation of the blade is unstable.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a bearing unit for a mowing machine safety plate in which bearings can be easily exchanged and the blade can be stably rotated without shaking.

In order to solve the above-mentioned problems, a bearing unit for a lawn mower safety plate according to the present invention comprises a bearing portion having a cylindrical portion for supporting a drive shaft and a pedestal for holding the cylindrical portion while supporting the bearing portion, And a bearing fixing portion having a cylindrical portion and a bearing inserted into the bearing and a female screw threadably engaged with the male screw, wherein the bearing and the bearing fixing portion are screwed to each other at an upper portion of the bearing.

The bearing may be in the form of a hexagonal bolt formed of a hexagonal pedestal supporting a cylindrical portion having a male screw, and the bearing fixing portion may have a hexagonal nut shape in which a thread corresponding to the male screw of the bearing is formed inside the hole. At this time, the diameter of the support of the bearing and the bearing fixing part may be one of 19 mm or 16 mm. The bearing may further include a buffer between the pedestal of the bearing and the bearing to absorb an impact of the motion of the bearing.

According to the bearing unit for a safety plate of the present invention, since the bearing for supporting the drive shaft and bearing is inserted and the bearing fixing portion for fixing the bearing and the work table are screwed to each other, after the bearing fixing portion is screwed off from the bearing, Since it is only necessary to replace the bearing, it is easy to replace the bearing. Further, since the bearing and the bearing fixing portion are securely fixed by the screw connection irrespective of the rotation or vibration of the drive shaft, the bearing unit is firmly adhered to the work table and the blade can be stably rotated without shaking.

1 is a cross-sectional view illustrating a lawn mower using a bearing unit for a safety plate according to the present invention.
Fig. 2 is a perspective view showing a bearing unit for a lawn mower safety plate of Fig. 1. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

In the embodiment of the present invention, a bearing unit for a mowing machine safety plate capable of easily exchanging bearings and capable of stably rotating the blade without shaking will be presented. Here, the bearing unit includes a bearing for supporting a drive shaft, a bearing inserted around the bearing, and a bearing fixing portion for screwing the bearing to the bearing and bringing the bearing into close contact with the workbench. Hereinafter, the structure of the bearing unit for a lawn mower safety plate will be described in detail in the embodiment of the present invention.

1 is a cross-sectional view showing a lawn mower 100 using a bearing unit 20 for lawn mower safety plate according to the present invention.

1, the lawn mower 100 of the present invention includes a work table 2 that can be held by a user, a drive shaft 4 of a drive motor (not shown) provided at an end of the work table 2, a drive shaft 4, A blade unit 8 connected to the drive shaft 4 and cutting the grass to be cut while rotating together with the drive shaft 4, a bearing unit 20 mounted on the outer side of the drive shaft 4 for allowing the drive shaft 4 to rotate smoothly, A lid 26 for protecting the bearing unit 20, and a safety plate 28. At this time, the blade 8 is supported by the blade support 6, and the lid 26 and the safety plate 28 are screwed together by the first engagement portion 30 formed of the bolt 22 and the nut 24 .

The bearing unit 20 includes a bearing 10 for supporting and supporting a space for rotating the drive shaft 4, a bearing 12 for smoothly rotating the drive shaft 4 by absorbing the rotational force of the drive shaft 4, And a bearing fixing part (18) provided between the work table (2). Here, a ball is provided in the bearing 12 to absorb the rotational force generated when the drive shaft 4 rotates, thereby preventing the drive shaft 4 from swinging. On the bottom surface of the bearing 12, a shock absorber 16 for absorbing shock due to the movement of the bearing 12 is provided. The bearing unit 20 will be described later in more detail with reference to FIG.

2 is a perspective view of the bearing unit 20 for the safety plate shown in Fig. 2, the bearing unit 20 of the present invention has a structure in which a bearing 12 is inserted while a bearing 10 is mounted on a bearing 10 for supporting a drive shaft 4 rotating in a constant direction, And the bearing 10 and the bearing fixing portion 18 are screwed to each other.

The bearing 10 provides and supports a space for rotating the drive shaft 4 so that a left hand thread for engaging with the drive shaft 4 is formed inside the bearing 10. The bearing 10 includes a cylindrical portion a for supporting the drive shaft 4 and a pedestal b for supporting the bearing 12 while fixing the cylindrical portion a, Has a hexagonal bolt shape in which a male thread is formed. The bearing fixing portion 18 screwed with the male screw formed at the upper end of the bearing 10 at the upper portion of the bearing 12 inserted into the bearing 10 has a threaded portion 18, And has a hexagonal nut shape. In other words, the bearing 10 and the bearing fixing portion 18 are screwed to each other in the form of a pair of bolts / nuts with the bearing 12 sandwiched therebetween.

Accordingly, when the bearing 12 is replaced, the bearing unit 20 is removed from the drive shaft 4 coupled with the left screw in the bearing 10, and then the bearing fixing portion 18 is rotated from the bearing 10 to the screw The bearing 12 can be replaced. Here, the diameter of the pedestal (b) of the bearing (10) and that of the bearing fixing portion (18) are the same and their diameters are appropriately selected according to need, but 19 mm or 16 mm is particularly preferable. Therefore, the user can easily remove the screw using a commonly used 19 mm or 16 mm wrench, so that the consumable bearing can be easily replaced. Although the shapes of the pedestal b and the bearing fixing part 18 of the bearing 10 are shown in the form of a hexagonal bolt and a nut, the present invention is not limited thereto.

In the case of a conventional lawnmower, a groove is formed in the upper part of the bearing in which the bearing is inserted to fasten the bearing and the bearing fixing part, and a detent ring for mounting the bearing fixing part in the groove is inserted. Since the conventional bearing fixing portion is fixed to the bearing by the stop ring, there is a case where the stop ring is detached or broken from the groove as the drive shaft rotates. If the detent ring is damaged, the bearing unit can not be fixed to the work table and is shaken, thereby making the rotation of the blade unstable.

However, in the case of the bearing unit 20 of the present invention, since the bearing 10 in which the male screw is formed and the bearing fixing portion 18 in which the female screw is formed are screwed to each other, . Accordingly, even if the drive shaft 4 rotates, the bearing unit 20 is firmly brought into close contact with the work table 2, so that the blade 8 can be prevented from rotating unstably.

In addition, in the conventional case, the stop ring must be disassembled when replacing the bearing. Since the stop ring requires the use of a separate tool, it is difficult for general users to replace the bearing. However, according to the bearing unit 20 of the present invention, since the bearing 10 and the bearing fixing portion 18 are screwed to each other at the upper portion of the bearing 12 inserted in the bearing 10, The bearing 12 can be easily removed from the bearing 10 after the screw 12 is removed from the fixing portion 18 and the damaged bearing 12 can be easily replaced. Therefore, according to the lawn mower 100 using the bearing unit 20 for a safety plate of the present invention, since only the damaged bearing needs to be replaced after the bearing 10 is screwed, the life of the lawn mower can be prolonged.

As described above, according to the lawn mower using the bearing plate for a safety plate of the present invention, since the bearing for supporting the drive shaft and bearing is inserted and the bearing fixing portion for fixing the bearing and the work table are screwed to each other, It is only necessary to replace the damaged bearing, so that it becomes easy to replace the bearing. Further, since the bearing and the bearing fixing portion are securely fixed by the screw engagement regardless of the rotation or vibration of the drive shaft, the bearing unit can firmly contact the work table without shaking, and the blade can be stably rotated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It is possible.

2; Workbench 4; driving axle
8; Blade 10; bearing
12; Bearing 18; Bearing fixing portion
20; Bearing unit 26; cover
28; A safety plate 100; Mowers

Claims

A drive shaft rotating with a blade for cutting grass;
A bearing portion having a cylindrical portion for supporting the drive shaft and a pedestal for supporting the bearing while fixing the cylindrical portion, the bearing portion having a male screw at an end of the cylindrical portion;
A bearing inserted into the pedestal while having a cylindrical portion of the bearing; And
And a bearing fixing portion having a female screw threadably engaged with the male screw,
Wherein the bearing and the bearing fixing portion are screwed to each other at an upper portion of the bearing.

The bearing according to claim 1, wherein the bearing is in the form of a hexagonal bolt formed of a hexagonal pedestal supporting a cylindrical portion having a male screw, and the bearing fixing portion has a hexagonal nut shape in which a thread corresponding to the male screw of the bearing is formed inside the hole Bearing unit for lawn mower safety plate.

3. The bearing unit for a lawn mower safety plate according to claim 2, wherein a diameter of the bearing and the bearing fixing part of the bearing is one of 19 mm or 16 mm.

The bearing unit for a lawn mower safety plate according to claim 1, further comprising a buffer part between the bearing of the bearing and the bearing, for absorbing an impact due to the movement of the bearing.