TW201915358A - Ball screw nut with dustproof cover with the scrapping unit being disposed in the positioning slots arranged at different locations, so different scrapping actions can be provided to a guide screw rod, and a better dustproof effect can also be achieved - Google Patents

Abstract

A ball screw nut with a dustproof cover includes a screw nut member and a dustproof cover. The screw nut member has a guiding screw part. The dustproof cover is disposed at one side of the screw nut member, and has a main body and at least one scrapping unit disposed on the main body. The main body has at least one positioning slot set. The positioning slot set has a plurality of positioning slots surrounding an axial line and arranged with intervals. A distance defined between a slot bottom part to a corresponding slot opening part of each positioning slot is different. The scrapping unit is disposed in one of the positioning slots of the positioning slot set, and has a positioning part positioned in the slot bottom part, and a scrapping part arranged opposite to the positioning part and protruded into an inner hole of the main body. With the scrapping unit being disposed in the positioning slots arranged at different locations, different scrapping actions can be provided to a guide screw rod, and a better dustproof effect can also be achieved.

Description

Ball nut with dust cover

The present invention relates to a transmission device, and more particularly to a ball nut having a dust cover.

In order to prevent dust, machining fines, cutting fluid and the like from infiltrating between the ball screw and the nut, a dustproof member is disposed at each end of the nut. For example, Taiwan certificate number No. M523023, I464336, I504824, I516694, I571577...etc.

Although the above patents utilize the arrangement of the dustproof elements to achieve the intended dustproof purpose of the nuts, the dustproof elements of the patents are provided with a ball-facing body on a hollow ring-shaped body. The protruding portion of the screw abutting, that is, the protruding portion of the dustproof member cannot be adjusted to different depths and different angles with respect to the ball screw according to requirements, and the dustproof effect cannot be obtained according to the use requirement.

Accordingly, it is an object of the present invention to provide a ball nut having a dust cover that produces a better wiping and dustproof effect.

Therefore, the ball nut having the dust cover of the present invention comprises a nut member and a dust cover. The nut member extends along an axis and has a hollow cylindrical shape, and has an inner circumferential surface surrounding the axis and defining a shaft hole, and at least one guiding screw portion disposed on the inner circumferential surface. The dust cover is mounted on the side of the nut member along the axis, and is disposed outside the guiding portion, and includes a body and at least one scraping member attached to the body, the body having a first end surface and a first end surface a second end surface opposite to the first end surface along the axis, an inner ring surface connected between the first end surface and the second end surface and surrounding an inner hole, and an outer ring opposite to the inner ring surface And a positioning groove group recessed by the first end surface toward the second end surface, the positioning groove group has a plurality of positioning grooves spaced apart around the axis, each positioning groove of the positioning groove group has a notch portion corresponding to the inner annular surface, and a bottom portion of the groove between the notch portion and the outer annular surface, the distance from the bottom of each positioning groove to the corresponding notch portion is not equal, The squeegee member is mounted at least in one of the locating grooves of the locating groove group, and has a positioning portion located at a bottom portion of the groove, and a squeegee portion opposite to the positioning portion and extending in the inner hole.

The utility model has the advantages that the positioning of the positioning grooves is utilized, so that different numbers of the wiping members can be installed in the at least one positioning groove according to requirements, and the wiping member can produce different angles and different depths for a lead screw. The wiping effect can achieve better dustproofing purposes.

Referring to Figures 1, 2 and 3, an embodiment of a ball nut having a dust cover of the present invention is preferably screwed to a lead screw 1 extending along an axis L, the lead screw 1 having an outer surface 101, and A threaded groove 102 is provided around the axis L and extending helically on the outer surface 101. The ball nut includes a nut member 10 and a pair of dust caps 20.

The nut member 10 has a hollow cylindrical shape and has an inner peripheral surface 12 surrounding the axis L and defining a shaft hole 11, and a guide screw portion 13 protruding from the inner peripheral surface 12.

Referring to FIG. 4 to FIG. 6 , the dust caps 20 are respectively mounted on opposite sides of the nut member 10 along the axis L, and are respectively disposed outside the guide screw portion 13 and each include a body 21 , and Most of the wiper members 22 are mounted to the body 21. The body 21 has a first end surface 211, a second end surface 212 opposite to the first end surface 211 along the axis L, and a connection between the first end surface 211 and the second end surface 212. An inner annular surface 214 of the hole 213, an outer annular surface 215 opposite to the inner annular surface 214, and four positioning groove groups 23 recessed from the first end surface 211 toward the second end surface 212, the positioning groove groups 23 is disposed at equal intervals around the axis L. Each of the positioning groove groups 23 has a plurality of positioning grooves 231 spaced apart around the axis L. Each of the positioning grooves 231 has a slot shape and has a corresponding one. a notch portion 232 of the toroid 214, a groove bottom 233 interposed between the notch portion 232 and the outer ring surface 215, an enlarged portion 234 corresponding to the bottom portion 233 of the groove, and a portion 234 facing the enlarged portion 234 The extending portion 235 of the notch portion 232 extends in a trapezoidal shape perpendicular to the axis L of the enlarged portion 234, and the enlarged width of the enlarged portion 234 corresponding to the body 21 is greater than the ring corresponding to the body 21 of the extending portion 235 To the width. The distance from the bottom 233 of the locating slot 231 of each locating slot group 23 to the corresponding slot portion 232 is not equal. Each locating slot 231 of the locating slot group 23 is respectively along a respective centerline. L1 extends from the bottom portion 122 of the groove toward the notch portion 232, and the distance between the center line L1 of each of the positioning grooves 231 and the reference plane P passing through the axis L is not equal. In addition, as shown in FIG. 4, the angle of intersection of each of the positioning grooves 231 of the positioning groove groups 23 through the plane P1 of the respective center line L1 and the reference plane P passing through the axis L is not equal.

The scraping members 22 of the present example are respectively mounted in one of the positioning grooves 231 of the positioning groove group 23, and each has a positioning portion 221 located at the bottom portion 233 of the groove and nested in the enlarged portion 234, and A wiper portion 222 opposite to the positioning portion 221 and extending in the inner hole 213. The positioning portion 221 has a trapezoidal shape in a cross-sectional shape perpendicular to the axis L, and the positioning portion 221 corresponds to a circumferential width of the body 21 that is larger than a circumferential width of the wiping portion 222 corresponding to the body 21. The wiping portion 222 is a brush and can be restrained in the thread groove 102 of the lead screw 1 .

As shown in FIG. 2 to FIG. 5, when the dustproof covers 20 are integrally assembled, the dustproof covers 20 are locked to the opposite sides of the nut member 10, and the ball nuts are screwed together. When the lead screw 1 is used, the brush portion 222 of the wiper member 22 is pressed into the thread groove 102 of the lead screw 1, so that the ball nut can have a better dustproof effect.

And the effects that can be produced by the present invention can be further summarized as follows:

1. The use of the center line L1 of each of the positioning grooves 231 of the positioning groove group 23 and the spacing of the reference plane P passing through the axis L are not equal, and the groove bottom 233 of the positioning groove 231 to the corresponding groove The distances of the mouth portions 232 are not equal, and the wiping portions 222 of the wiping members 22 can be adjusted to abut against the wiping position of the outer surface 101 of the lead screw 1, so that adjustment can be made for different needs, and the adjustment operation is equivalent. It is easy to remove the scraping members 22 from the different positioning slots 231 by simply removing the main body 21 from the nut member 10.

2. The use of each of the positioning grooves 231 of the positioning groove groups 23 through the plane P1 of the respective center line L1 and the angle of intersection of the reference plane P passing through the axis L are not equal, that is, the inclination of the positioning grooves 231 The wiping portion 222 of the scraping member 22 can produce different angles of wiping action on the outer surface 101 of the lead screw 1 for different needs, and the wiping effect is better.

3. In this embodiment, a wiper member 22 is mounted in one of the positioning slots 231 of each of the positioning slot sets 23, but in fact, it can also be installed in each of the two positioning slots 231 of each of the positioning slot sets 23. There is a wiper member 22, or a wiper member 22 is mounted in each of the positioning grooves 231, and the number of the wiper members 22 can be adjusted for different needs.

4. If some of the scraping members 22 are worn, the bodies 21 can be easily removed, and the scraping members 22 are replaced, and all the scraping members 22 need not be replaced, and the bodies 21 do not need to be replaced. With the replacement, it can achieve cost-saving purposes and meet the needs of environmental protection.

In summary, the ball nut of the dust cover of the present invention has a simple overall structure, and the operation of assembling and replacing is relatively easy. With the arrangement of the positioning grooves 231, the lead screw 1 can be produced at different angles. The wiping effect of different depths can indeed achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧ lead screw

101‧‧‧ outer surface

102‧‧‧Thread groove

L‧‧‧ axis

10‧‧‧ nut parts

11‧‧‧Axis hole

12‧‧‧ inner circumference

13‧‧‧Guide

20‧‧‧Dust cover

21‧‧‧ body

211‧‧‧ first end face

212‧‧‧second end face

213‧‧‧ 内孔

214‧‧‧ Inner torus

215‧‧‧ outer annulus

22‧‧‧Scratch parts

221‧‧‧ Positioning Department

222‧‧‧Scratch

23‧‧‧ positioning slot set

231‧‧‧ positioning slot

232‧‧‧ Notch

233‧‧‧ bottom of the trough

234‧‧‧ Expanded paragraph

235‧‧‧Extension

L1‧‧‧ center line

P‧‧‧ datum

P1‧‧ plane

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is an exploded perspective view of an embodiment of a ball nut having a dust cover according to the present invention; Figure 3 is a cross-sectional view taken along line III-III of Figure 2; Figure 4 is a top plan view of the embodiment; Figure 5 is a perspective view of one of the dust caps of the embodiment A body and a plurality of wiper members are illustrated; and FIG. 6 is an exploded perspective view of the dust cover of the embodiment.

Claims (7)

A ball nut having a dust cover, comprising: a nut member extending along an axis and having a hollow cylindrical shape, and having an inner circumferential surface surrounding the axis and defining a shaft hole, and at least one disposed therein a guide portion of the circumferential surface; and at least one dust cover mounted on one side of the nut member along the axis, and disposed outside the guide portion, and including a body, and at least one scraping member attached to the body The body has a first end surface, a second end surface opposite to the first end surface along the axis, and an inner annular surface connected between the first end surface and the second end surface and surrounding an inner hole. An outer annular surface opposite to the inner annular surface, and at least one positioning groove group recessed from the first end surface toward the second end surface, the positioning groove group having a plurality of positioning grooves spaced apart around the axis, the positioning groove group Each of the positioning grooves of the positioning groove group has a notch portion corresponding to the inner ring surface, and a groove bottom portion between the notch portion and the outer ring surface, and the groove bottom portion of each positioning groove is The distances of the corresponding notch portions are not equal, the wiper member is Mounted on the locating slot group wherein a positioning slot, and having a positioning portion located at the bottom of the groove is constant, and a wiping portion opposite to the positioning portion and is provided extending to the inner bore. The ball nut having a dust cover according to claim 1, wherein the number of the positioning groove groups of the dust cover is plural, and the positioning groove groups are disposed at equal intervals around the axis. The ball nut having a dust cover according to claim 2, wherein each of the positioning grooves of the positioning groove group of the dust cover extends from the bottom of the groove toward the notch along a respective center line, each positioning groove The centerline is not equal to the pitch of a reference plane passing through the axis. The ball cap nut of the dust cap is provided in any one of the items 1 to 3, wherein the positioning grooves of the dust cover are in the shape of a slot, and each of the positioning slots further has a bottom corresponding to the bottom of the slot. An enlarged section and an extension extending from the enlarged section toward the notch portion, the enlarged section corresponding to a circumferential width of the body being larger than a circumferential width of the extension corresponding to the body, and the positioning of the scraping member The portion is locked in the enlarged section, and the positioning portion corresponds to a circumferential width of the body greater than a circumferential width of the wiper portion corresponding to the body. A ball nut having a dust cover according to claim 4, wherein the wiping portion of the wiper member of the dust cover is a brush. The ball nut having a dust cover according to claim 2, wherein each of the positioning grooves of the positioning groove group of the dust cover extends from the bottom of the groove toward the notch along a respective center line, each positioning groove The angle of intersection of a plane passing through the respective centerlines and a reference plane passing through the axis is not equal. The ball nut having the dust cover according to claim 1 is preferably screwed to a lead screw, the lead screw is disposed in the shaft hole of the nut member, and the inner hole of the dust cover, and has an outer surface And a thread groove disposed around the axis and extending helically on the outer surface, the wiper portion being capable of resisting the thread groove of the lead screw.