KR20140142012A - Bearing uint and brush cutter using that - Google Patents

Abstract

The present invention relates to a bearing unit and a lawn mowing machine using the same, and a bearing unit according to the present invention includes a support portion for supporting a lower surface of a lawn mowing blade and having a shaft hole formed therethrough so that a drive shaft of the lawn mowers penetrates, A connecting member having a bushing portion protruding upward from the flange portion and projecting upward from the flange portion and having an insertion hole for inserting the insertion portion; And a locking portion for preventing the insertion portion from being separated from the bushing portion.

Description

Bearing unit and grass cutter using same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing unit and a lawn mower using the same, and more particularly, to a bearing unit that rotatably supports a drive plate of a lawn mower blade and supports a protective plate so that a protective plate is positioned below the lawn mower blade, will be.

Since the lawn mower uses the knife at the bottom of the rotary shaft of the work platform and is exposed to the outside, there is a risk of accidents when a person including a child unconsciously approaches, and the blade collides with an object on the ground It often happens that the object on the ground bounces off due to the speed at which the blade rotates.

In addition, there is a risk that the blades may be warped or broken while the blades collide with the object, which may cause a secondary accident such as a user losing the work table due to the impact.

A number of lawn mowers have been disclosed to prevent accidents by providing a safety plate at the bottom of the blade so as to smoothly cut the weeds in a protected state of the blade, such as the registered utility model No. 214892.

However, in the case of the lawn mower mentioned above, when the work platform is lowered during the work or when the safety plate comes into contact with the ground due to the decrease of the concentration force, it is difficult to cut the weed smoothly due to the problem that the protective plate penetrates the ground and enters the ground. There is a disadvantage that the efficiency is lowered.

A design for solving the above problem is disclosed in Registration Utility Model No. 20-0439951.

However, in the above-described conventional blade protecting lawn mower, there is a risk that the blade protection plate for protecting the blade receives rotating force rotating together by the driving force of the driving motor for rotating the blade so that breakage may occur at the connection point.

Therefore, the applicant of the present application has filed a domestic application 10-2009-0041732 for a protective cover for lawn mower having a plate rotation supporting means for supporting the protective plate for protecting the blade at a predetermined angle.

However, the conventional protective cover for lawn mower application has a drawback that it is necessary to exchange the entire protective cover due to a failure of the bearing due to foreign matter flowing into the bearing connecting the blade of the lawn mower and the protective cover coupled to the lower part of the blade, There was an excessive maintenance cost.

An object of the present invention is to provide a bearing unit provided with a waterproof cap for preventing foreign matter from entering into a protective cover during a mowing operation, and a grass cutter using the same.

According to an aspect of the present invention, there is provided a bearing unit comprising: a support portion that supports a lower surface of a grass cutter blade and has a shaft hole formed therethrough so that a drive shaft of the grass cutter passes through the support shaft; A connecting member provided with a bushing portion protruding upward from the flange portion and having an insertion hole for inserting the insertion portion on an upper surface thereof; And a locking portion for preventing the insertion portion from being separated from the bushing portion.

In the meantime, a lawn mower according to the present invention is a lawn mower that rotates a blade coupled to a drive shaft of a work rod by a rotational force transmitted from a power generating unit through a work rod, the lawn mower being coupled to the drive shaft to be positioned below the blade, A cover member which is formed to have a diameter relatively larger than a rotation diameter of the protection plate and protects the blade, a bearing member coupled between the protection plate and the drive shaft, and supporting the drive shaft relatively rotatably with respect to the protection plate, Wherein the bearing unit supports a lower surface of the blade and includes a support portion having a shaft hole formed therethrough so as to penetrate the drive shaft, an auxiliary shaft member provided with an insertion portion extending downwardly to the support portion, A flange portion coupled to the protection plate, And a bearing which is installed between the insertion portion and the bushing portion and rotatably supports the auxiliary shaft member with respect to the connection member, And a locking portion for preventing the insertion portion from being separated from the bushing portion.

In the meantime, the lawn mower according to the present invention is installed on the protection plate so as to close the through-hole so as to prevent water from flowing into the bearing unit through the through-hole formed in the protection plate at a position opposed to the drive shaft It is preferable to further include a waterproof plug.

The bearing unit according to the present invention and the lawn mower using the same prevent foreign matter from flowing into the bearing due to a water stopper provided in a through hole formed in the protection plate to prevent defects in the bearing caused by the foreign matter.

1 is a perspective view showing an embodiment of a protective cover for lawn mowers according to the present invention,
Fig. 2 is an exploded perspective view showing the plate rotation support means of Fig. 1,
Fig. 3 is a side sectional view of Fig. 1,
Fig. 4 is a perspective view of the cover member of Fig. 1,
Fig. 5 is a side cross-sectional view of the bearing unit of Fig. 1,
Fig. 6 is an exploded perspective view of the bearing unit of Fig. 1,
7 is a partially cutaway perspective view showing another embodiment of the plate rotation support means,

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a protective cover for lawn mowers according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 show a lawn mower and a first embodiment of a lawn mower protective cover mounted on the lawn mower.

The lawn mower of the first embodiment includes a drive motor 20 installed at the end of the work table 30 and a drive motor 20 installed at the drive shaft 21 of the drive motor 20 and rotated together with the drive shaft 21, And a protective cover 100 installed on the lower side of the blade 10 to protect the blade 10.

Of course, the lawn mower may further include a switch for applying a drive signal to the drive motor 20, which is worn by a user, and a power supply for supplying power.

The protective cover for lawn mowers 100 includes a cover member 110 supported on a drive shaft 21 so as to be positioned below the blade 10 and a cover member 110 connected to the drive shaft 21 of the blade 10 And a plate rotation support means 120 for supporting the cover member 110. The plate rotation support means 120 includes:

The drive shaft 21 is rotatably coupled to the cover member 110 by a bearing unit 160 and passes through the bearing unit 160 and the protection plate 112. The drive shaft 21 is fixed to the lower surface of the protection plate 112 by a fastening nut 40).

The cover member 110 includes a protection plate 112. The protection plate 112 is mounted on the central upper surface of the bearing unit 160. The distance from the bearing unit 160 to the outer circumferential surface of the cover unit 110 is greater than the distance between the blade 10 The radius of curvature is larger than the radius of rotation. A plurality of cutting grooves 113 are formed at the edge of the protection plate 112 so as to be spaced apart from each other along the circumferential direction at a predetermined depth toward the center.

The protrusion 114 is formed between the cutting grooves 113 by the cutting grooves 113. Therefore, the cutting grooves 113 and the protrusions 114 are formed at the edge of the protective plate 112 in an alternating manner As shown in Fig.

A plurality of cutting holes 115 penetrating the upper and lower surfaces are formed in the cutting groove 113. The protection plate 112 is formed with a through hole formed at the center thereof so as to penetrate the nut in a vertical direction so that the nut can be fastened to the drive shaft 21.

Since the protrusion 114 is formed to be longer than the radius of rotation of the blade 10, the protective plate 112 is preferably attached to the protrusion 114 before the blade 10 collides against any obstacle during the grass- Interference.

Therefore, it is possible to prevent gravel or other foreign matter from colliding against the blade 10 rotating at a high speed, and to prevent the blade 10 from colliding with another obstacle other than grass, and being damaged.

Since the cutting groove 113 and the through hole 115 are formed, the protrusion 112 protrudes upward from the upper surface of the protection plate 112 through the cutting groove 113 and the through hole 115, Since only the inside of the pool is cut, a safe mowing operation can be performed.

The protection plate 112 prevents foreign matter from flowing into the connection point between the bearing unit 160 and the drive shaft 21 along the circumferential direction surrounding the bearing unit 160 to prevent the blade 10 from interfering with the rotation of the blade 10 In this embodiment, the auxiliary foreign matter shielding portion is formed as a bending plate 116 extending upward from the edge of the through hole 115 so as to be spaced along the circumferential direction surrounding the bearing unit 160 have.

The bending plate 116 is formed by perforating the edge of the portion to be bent when the perforating operation is performed by the press machine in the process of perforating the through hole 115 at the time of processing the protection plate 112 and bending it.

In this embodiment, the auxiliary foreign matter blocking part includes a plurality of bending plates 116 spaced apart from each other by a predetermined distance so as to be bent so as to be able to bend during the processing of the protection plate 112. However, And may be formed to be coupled to an upper portion of the protection plate 112 to enclose the protection plate 160.

The bearing unit 160 is for rotatably supporting the drive shaft 21 of the blade 10 with respect to the protection plate 112 as described above. The bearing unit 160 is installed on the upper portion of the protection plate 112. The bearing unit 160 includes an auxiliary shaft member 170 mounted on the drive shaft 21 and a shaft member 170 rotatably inserted, A bearing 210 provided between the auxiliary shaft member 170 and the connecting member 180 and a bearing 210 provided between the auxiliary shaft member 170 and the connecting member 180 to prevent the auxiliary shaft member 170 from being detached from the connecting member 180 And a locking portion.

The auxiliary shaft member 170 supports the lower surface of the blade 10 and includes a support portion 171 having a shaft hole 173 formed at the center thereof so as to allow the drive shaft of the lawn mower to pass therethrough and an insertion portion 172).

When the drive shaft 21 is inserted through the shaft hole 173, the blade 10 is supported on the upper surface of the support portion 171 . The supporting portion 171 is formed with a high-frequency trough 174 having a circular cross section and a diameter larger than that of the shaft hole 173 about the central portion where the shaft hole 173 is formed.

In the case of a general lawn mower, a high tide is installed in the lower part of the blade 10. The high tide includes a blade supporting portion for supporting the bottom surface of the blade 10 and a nut supporting portion for supporting the nut on the underside of the blade supporting portion. The nut supporting portion is in contact with and presses the nut The high tide supports the blade, and the blade is restrained by the rotating body and the high tide, which are provided at the upper side, and the rotation can not be performed in the vertical direction.

Since the auxiliary shaft member 170 of the present invention is formed with the high trench 174 in the support portion 171, it is not necessary to separately provide a high tide, so that the ease of use is high.

The supporting portion 171 is larger than the inner diameter of the insertion hole of the connecting member 180 to be described later so as to prevent the connecting member 180 from moving up and down along the auxiliary shaft member 170 and interfering with the grass blade 10 It is preferable to have an outer diameter. Even if the connecting member 180 moves up and down along the auxiliary shaft member 170 by the rotation of the driving shaft 21, the driving shaft 21 interferes with the supporting portion 171 provided on the driving shaft 21,

The support portion 171 is stepped to correspond to a stepped portion formed on the upper surface of the bushing portion 182 of the connection member 180, which will be described later. The support portion 171 is coupled to the step portion of the bushing portion 182 and rotates to prevent the support portion 171 from being detached from the connection member 180 during rotation.

The insertion portion 172 extends downward from the lower surface of the support portion 171 and is formed into a cylindrical shape having an outer diameter smaller than the outer diameter of the support portion 171 so as to be inserted into the insertion hole of the connection member 180 described later. An insertion groove 172 is formed in the outer circumferential surface of the lower end of the insertion portion 172 to form a closed track along the circumferential direction so that the locking portion described later can be easily coupled.

The connecting member 180 includes a flange portion 181 detachably coupled to the upper surface of the protection plate 112 by a fastening member 183 and a flange portion 184 protruded upward from the flange portion 181, And a bushing portion 182 to which the insertion portion 172 is rotatably coupled.

The flange portion 181 is formed to have a plurality of fastening holes spaced apart from each other along the circumferential direction by a predetermined distance and the fastening member 183 passes through the fastening hole and the fastening hole 111 of the protection plate 112, .

The bushing portion 182 extends upward from the flange portion 181 by a predetermined length and is formed into a cylindrical shape having a predetermined radius. The bushing portion 182 is formed with an insertion hole so as to penetrate the insertion portion 172 in the vertical direction so that the insertion portion 172 can be inserted into the upper surface thereof. The bushing portion 182 is formed with a stepped portion at an upper edge thereof along a circumferential direction so that a stepped portion can be engaged with the lower surface of the support portion 171.

The bearing 210 is provided between the inserting portion 172 and the bushing portion 182 to reduce the friction between the inserting portion 172 and the bushing portion 182. The inserting portion 172 can be inserted A hollow ball bearing having an inner diameter corresponding to the outer diameter of the inserting portion 172 is formed.

The locking part is fastened to the coupling groove 184 formed at the lower end of the insertion part 172 and supports the lower surface of the bearing 210 from the lower end of the insertion part 172. The locking part interferes with the lower surface of the bushing part 182, 172 formed at an outer diameter larger than the inner diameter of the inserting hole so as to prevent the inserting portion 172 from separating from the bushing portion 182. [

The snap ring 192 is formed in a ring shape with one side separated and formed with a coupling hole having an inner diameter corresponding to the outer diameter of the insertion portion 172 of the portion where the coupling groove 175 is formed at the center so as to be fastened to the coupling groove 175 .

When the blade 10 rotates, the blade 10 and the drive shaft 21 rotate together with the auxiliary shaft member 170 that contacts the bearing 210. The protective plate 112 rotates around the outer peripheral surface of the bearing 210, The cover member 110 does not rotate but only the blade can be rotated.

Since the bearing unit 160 has only a hollow through which the drive shaft 21 passes, the drive shaft 21 is integrated with the blade 10 so that the drive shaft 21 is fixed with a separate nut at the lower portion of the protective plate 112 It is possible to insert the fastening pin upwardly from the lower portion of the protection plate 112 and screw it into the blade 10.

The plate rotation support means 120 includes a spring member 126 whose one end is coupled to the work table 30 and the protection plate 112 and a protective pipe 129 that surrounds the spring member 126.

The work table 30 is provided with a fixing bracket 121. The fixing bracket 121 can cover the work table 30 and is formed with a fastening part 122 with both ends thereof projecting in parallel, And a fastening hole 123 is formed in each of the fastening portions 122.

The first and second fixing hooks 127 and 128 are formed at the upper and lower ends of the spring member 126. The first fixing hook 127 is engaged with the fixing bolt 124 and the second fixing hook 128 Is fitted and held in the fixing hole 118 formed in the protection plate 112. [

When the blade 10 is rotated at a high speed by the spring member 126, the protection plate 112 is rotatable by a predetermined angle, thereby preventing the protection plate 112 from being damaged. The rotated protection plate 112 is returned to the initial position by the restoring force of the spring member 126.

In the present embodiment, the spring member 126 is applied as a member for providing an elastic force to return the rotated protection plate 112 to an initial position. In addition, various members capable of being elastically deformed, such as a rubber material rope capable of elongating a predetermined length, Can be applied.

The upper end of the protection tube 129 is supported by the fixing bracket 121 and the lower end of the protection tube 129 is supported by the upper surface of the protection plate 112.

The protection tube 129 is applied as a gap retaining member that protects the spring member 126 and maintains the separation distance between the protection plate 112 and the blade 10 at a certain distance.

When the attraction force of the spring member 126 is excessively large in the process of returning to the initial position by the restoring force of the spring member 126 after the protection plate 112 is rotated by a predetermined angle, The one side of the first protrusion 112 may be lifted upward and deformed.

When the deformation of one side of the protection plate 112 is generated, the blade 10 may collide with the protection plate 112. However, when the protection plate 112 is supported through the protection pipe 129 having a predetermined length as in the present embodiment, the protection plate 112 can be prevented from being lifted up by the protection pipe 129.

In this embodiment, the protection tube 129 is used as the gap maintaining member for keeping the gap between the blade 10 and the protection plate 112 constant. However, the gap maintaining member may be formed in various other forms.

In order to prevent water from flowing into the bearing unit 160 through a through hole formed in the protection plate 112 at a position opposite to the drive shaft 21, And a waterproof plug 211 installed on the protection plate 112 so as to close the opening.

The waterproof plug includes an insert having an outer diameter corresponding to an inner diameter of the through hole so that the waterproof plug can be inserted into the through hole of the protection plate 112 and a wave having an outer diameter larger than the inner diameter of the through hole, There is delay.

The waterproof plug is preferably formed of a rubber material having a predetermined elasticity so as to block water and foreign substances from entering the upper side of the protection plate 112.

7, a plate rotation support means 130 according to another embodiment of the present invention is shown.

Elements having the same functions as those in the previous drawings are denoted by the same reference numerals.

The plate rotation supporting means 130 includes a support rod 131 having one end coupled to the protection plate 112, a take-out rod 136 installed to be able to be drawn in and drawn out from the support rod 131, And an elastic member 138 provided inside the support rod 131.

The supporting rod 131 is formed with a hollow hole 132 extending in the longitudinal direction thereof so that the drawing rod 136 can be drawn in and drawn out. The hollow hole 132 is opened through the upper end. And the lower end is coupled to the protection plate 112, and is rotatably connected by the first universal joint 133.

The drawing rod 136 is connected to the fixing bracket 135 provided at the work table. The drawing rod 136 is also connected by the second universal joint 134 so that the drawing rod 136 is also free to rotate.

The lower end of the drawing rod 136 is located inside the support rod 131 and an expansion plate 137 having a diameter corresponding to the inner diameter of the hollow 132 of the support rod 131 is provided at the end. The withdrawing rod 136 is formed to be smaller in diameter than the inner diameter of the hollow 132 so that a predetermined spacing space is formed between the inner wall of the supporting rod 131 and the withdrawing rod 136.

The elastic member 138 is provided inside the support rod 131 to elastically bias the take-out rod 136 in a direction toward the lower end of the support rod 131. The elastic member 138 is a compression spring whose one end is supported by the extension plate 137 and the other end is supported by an engagement step (not shown) provided at the upper end of the support rod 131. The elastic force of the elastic member 138 The length of the entire support rod 131 and the withdrawing rod 136 connected to the protection plate 112 and the work table are kept to be minimum.

When the blade 10 is rotated by the driving of the lawn mowers, the protection plate 112 can be maintained in a state of being supported at a predetermined angle in the same manner as the plate rotation support means 120 of the first embodiment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100; Protective cover for lawn mowers
110; The cover member
112; Protective plate
120; Plate rotation support means
126; Spring member 129; Protectionist
160; Bearing unit
170: Auxiliary shaft member
171:
172:
180: connecting member
192: snap ring
210: Bearings

Claims (3)

A support shaft supporting a lower surface of the blade of the grass cutter and having a shaft hole so that a drive shaft of the grass cutter penetrates through the shaft, and a support shaft extending downwardly from the support shaft;
A connecting member having a bushing portion protruding upward from the flange portion and having an insertion hole for inserting the insertion portion on an upper surface thereof;
A bearing installed between the insertion portion and the bushing portion and rotatably supporting the auxiliary shaft member with respect to the connecting member;
And a locking portion for preventing the insertion portion from being separated from the bushing portion.
A grass cutter for rotating a blade coupled to a drive shaft of a work rod by a rotational force transmitted from a power generating portion through a work rod,
A cover member coupled to the drive shaft so as to be positioned at a lower portion of the blade and having a diameter relatively larger than a rotation diameter of the blade to protect the blade;
And a bearing unit coupled between the protection plate and the drive shaft to support the drive shaft relatively rotatably with respect to the protection plate,
The bearing unit
A support member which supports a lower surface of the blade and has a shaft hole formed therethrough so as to penetrate the drive shaft, an auxiliary shaft member provided with an insertion portion extending downwardly to the support portion,
A connecting member having a bushing portion protruding upward from the flange portion and having an insertion hole for inserting the insertion portion on an upper surface thereof;
A bearing installed between the insertion portion and the bushing portion and rotatably supporting the auxiliary shaft member with respect to the connecting member,
And a locking portion for preventing the insertion portion from being separated from the bushing portion.
3. The method of claim 2,
And a waterproof plug installed on the protection plate so as to close the through hole so as to prevent water from flowing into the bearing unit through a through hole formed in the protection plate at a position facing the drive shaft .

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