TWI671480B - Ball nut with dust cover - Google Patents

Abstract

A ball nut with a dust cover includes a nut piece and a dust cover. The nut piece has a lead screw portion. The dust cover is installed on one side of the nut piece and includes a body and at least one mounting member. For the scraper of the body, the body has at least one positioning groove group, the positioning groove group has a plurality of positioning grooves arranged at intervals around the axis, and the bottom of each groove of each positioning groove to the corresponding one of the slot openings. The distances are not equal. The scraper is installed in at least one of the positioning grooves of the positioning groove group, and has a positioning portion located at the bottom of the groove, and an inner hole opposite to the positioning portion and extending in the body. Scraping section. By using the positioning grooves of the scraping member installed at different positions, different scraping effects can be generated on a lead screw, and a better dust-proof effect can be achieved.

Description

Ball nut with dust cap

The invention relates to a transmission device, in particular to a ball nut with a dust cover.

To prevent dust, machining chips, cutting fluid and other substances from penetrating between the ball screw and the nut, a dustproof element is arranged at each end of the nut. For example, Taiwan Certificate No. M523023, I464336, I504824, I516694, I571577 ... and so on.

Although the above-mentioned patents use the arrangement of these dust-proof elements to achieve the desired dust-proof purpose of the nut, the dust-proof elements of these patents are provided with a ball that can face the hollow ring. The protruding parts abutted by the screw, that is, the protruding parts of the dust-proof elements cannot be adjusted to different depths and different angles with respect to the ball screw according to demand, nor can they produce a better dust-proof effect according to use requirements.

Therefore, an object of the present invention is to provide a ball nut with a dust cover which can produce a better scraping and dust-proof effect.

Therefore, the ball nut with a dust cover of the present invention includes a nut member and a dust cover. The nut member extends along an axis and has a hollow cylindrical shape, and has an inner peripheral surface that surrounds the axis and can define a shaft hole, and at least one guide screw portion provided on the inner peripheral surface. The dust cover is mounted along the axis on one side of the nut member, and is disposed outside the screw guide portion, and includes a body and at least one wiper member mounted on the body. The body has a first end surface, a 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 capable of surrounding an inner hole, and an outer ring opposite to the inner ring surface Surface, and at least one positioning groove group recessed from the first end surface toward the second end surface, the positioning slot group having a plurality of positioning slots arranged at intervals around the axis, each positioning slot of the positioning slot group having A notch portion corresponding to the inner annular surface and a notch portion between the notch portion and the outer annular surface; the distance from the notch of each positioning groove to the corresponding notch portion is not equal, The scraping member is installed in at least one of the positioning grooves of the positioning groove group, and has a positioning portion which must be located at the bottom of the groove, and a scraping portion opposite to the positioning portion and extending in the inner hole.

The effect of the present invention is that: by using the arrangement of the positioning grooves, different numbers of scraper members can be selected to be installed in at least one positioning groove according to requirements, and the scraper members can generate different angles and different depths to a lead screw The scraping effect can achieve better dustproof purposes.

1‧‧‧ Lead screw

214‧‧‧Inner torus

101‧‧‧ Outer surface

215‧‧‧outer torus

102‧‧‧Thread groove

22‧‧‧Scraper

L‧‧‧ axis

221‧‧‧Positioning Department

10‧‧‧nut parts

222‧‧‧Brushing Department

11‧‧‧ Shaft hole

23‧‧‧Positioning slot group

12‧‧‧ Inner peripheral surface

231‧‧‧Positioning slot

13‧‧‧Guide Screw

232‧‧‧Notch

20‧‧‧ dust cover

233‧‧‧Slot bottom

21‧‧‧ Ontology

234‧‧‧Expansion

211‧‧‧first end face

235‧‧‧extended

212‧‧‧Second end face

L1‧‧‧ Centerline

213‧‧‧Inner hole

P‧‧‧ datum

P1‧‧‧plane

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, wherein: FIG. 1 is an exploded perspective view of an embodiment of a ball nut with a dust cover according to the present invention; FIG. 2 is the A plane combined sectional view of the embodiment; FIG. 3 is a sectional view taken along line III-III in FIG. 2; FIG. 4 is a schematic plan view of the embodiment; and FIG. 5 is a perspective combined view of a dust cover of the embodiment , Illustrates a body and most of the scraping members; and FIG. 6 is an exploded perspective view of the dust cover of this embodiment.

Referring to FIGS. 1, 2 and 3, an embodiment of a ball nut with a dust cover according to the present invention is suitable for screwing a lead screw 1 extending along an axis L. The lead screw 1 has an outer surface 101, and A screw groove 102 is provided on the outer surface 101 and spirally extends around the axis L. 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 an axis hole 11, and a screw guide portion 13 protruding from the inner peripheral surface 12.

Refer to FIGS. 4 to 6 for cooperation. The dust covers 20 are respectively mounted on opposite sides of the nut member 10 along the axis L, and are respectively disposed on the outside of the screw guide 13 and each include a body 21, and Most of the brushes 22 are mounted on the body 21. The body 21 has a first end surface 211, a second end surface 212 that is opposite to the first end surface 211 along the axis L, and is connected between the first end surface 211 and the second end surface 212 and can be surrounded to form an inner surface. 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. 23 are arranged at equal intervals around the axis L, and each positioning groove group 23 has a plurality of positioning grooves 231 arranged at intervals around the axis L. Each of the positioning grooves 231 is in the shape of a class slot, and each has a corresponding slot. A notch portion 232 of the torus 214, a notch portion 233 between the notch portion 232 and the outer torus 215, an enlarged section 234 corresponding to the notch 233, and an enlarged section 234 toward the The extension section 235 extending from the notch portion 232, the enlarged section 234 is trapezoidal in cross-section shape perpendicular to the axis L, and the enlarged section 234 corresponds to a circumferential width of the body 21 larger than the extension section 235 corresponding to the ring of the body 21向 Width. To the width. In addition, the distance from the bottom 233 of the positioning grooves 231 of each positioning groove group 23 to the corresponding slot opening portion 232 is not equal. Each positioning groove 231 of the positioning groove group 23 is along a respective center line. L1 extends from the groove bottom portion 233 toward the notch portion 232, and the distance between the center line L1 of each positioning groove 231 and a reference plane P passing through the axis L is not equal. In addition, as shown in Figure 4, the positioning The intersection angles of each of the positioning grooves 231 of the groove group 23 with a plane P1 passing through the respective center line L1 and the reference plane P passing through the axis L are not equal.

The scraping members 22 of this example are respectively installed in one of the positioning grooves 231 of the positioning groove groups 23, and each has a positioning portion 221 that is located at the bottom of the groove 233 and nested in the enlarged section 234, and A scraping portion 222 opposite to the positioning portion 221 and extending in the inner hole 213. The cross-sectional shape of the positioning portion 221 perpendicular to the axis L is trapezoidal. The circumferential width of the positioning portion 221 corresponding to the main body 21 is larger than the circumferential width of the scraping portion 222 corresponding to the main body 21. The scraping portion 222 is a hair brush and can abut against the thread groove 102 of the lead screw 1.

As shown in FIGS. 2 to 5, when the dust caps 20 are completely assembled, the dust caps 20 are locked to the opposite sides of the nut member 10, and the ball nut is screwed together. When the lead screw 1 is mounted on the lead screw 1, the wiper portion 222 of the scraper member 22 abuts against 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 summarized as follows:

First, use the effect that the center line L1 of each positioning groove 231 of the positioning groove group 23 and the reference plane P passing through the axis L are not equal, and the groove bottom 233 of the positioning grooves 231 to the corresponding groove The distances between the mouth portions 232 are not equal. The wiper position 222 of the wiper members 22 can be adjusted to abut the wiper position of the outer surface 101 of the lead screw 1, so it can be adjusted for different needs, and the adjustment operation is equivalent. easily, Just by removing the bodies 21 from the nut member 10, the scraping members 22 can be easily removed and installed in different positioning grooves 231.

Second, use the effect that the intersection angle of each of the positioning grooves 231 of the positioning groove group 23 through the plane P1 of the respective center line L1 and the reference plane P passing through the axis L is not equal, that is, the inclination of the positioning grooves 231 With different angles, the scraping portions 222 of the scraping members 22 can have different angle scraping effects on the outer surface 101 of the lead screw 1 according to different needs, and the scraping effect is better.

3. In this embodiment, a wiper member 22 is installed in one of the positioning grooves 231 of each positioning groove group 23, but in fact, it can also be installed in each of the two positioning grooves 231 of each positioning groove group 23 There is a scraping member 22, or one scraping member 22 is installed in each of the positioning grooves 231, and the number of the scraping members 22 can be adjusted according to different needs.

4. If some of the scraping members 22 are worn, you can easily remove these bodies 21 and replace some of the scraping members 22 without replacing all the scraping members 22, and these bodies 21 do not need to be replaced. Following the replacement, the purpose of cost savings can be achieved, and it meets the needs of environmental protection.

To sum up, the ball nut with a dust cover of the present invention has a simple overall structure, and the operation of assembling and replacing is quite easy. The setting of the positioning grooves 231 can generate different angles for the lead screw 1. The scraping effect of different depths can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

Claims (7)

A ball nut with a dust cover includes: a nut member extending along an axis and in a hollow cylindrical shape, having an inner peripheral surface surrounding the axis and defining an axis hole, and at least one disposed in the inner A peripheral screw guide portion; and at least one dust cover, which is installed along the axis on one side of the nut member and is disposed outside the screw guide portion and includes a body and at least one wiper member installed on the body The body has a first end surface, a second end surface opposite to the first end surface along the axis, an inner annular surface connected between the first end surface and the second end surface and capable of 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 has a plurality of positioning grooves arranged at intervals around the axis. Each positioning groove of the positioning groove group has a notch portion corresponding to the inner annular surface, and a groove bottom between the notch portion and the outer annular surface. The distances between the corresponding notches are not equal. 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 with a dust cover according to claim 1, wherein the number of positioning groove groups of the dust cover is plural, and the positioning groove groups are arranged at equal intervals around the axis. The ball nut with a dust cover as described in claim 2, wherein each positioning slot of the positioning slot group of the dust cover extends along a respective center line from the bottom of the slot toward the slot portion, and each positioning slot The center line of is not equal to a reference plane passing through the axis. For example, any one of claim 1 to claim 3 has a ball nut with a dust cover, wherein the positioning grooves of the dust cover are in the shape of a class slot, and each of the positioning grooves has a corresponding slot bottom. An enlarged section, and an extended section extending from the enlarged section toward the notch, the enlarged section corresponding to the circumferential width of the body is greater than the extended section corresponding to the circumferential width of the body, and the positioning of the wiper member The locking portion is positioned in the enlarged section, and the circumferential width of the positioning portion corresponding to the body is larger than the circumferential width of the scraping portion corresponding to the body. The ball nut with a dust cover according to claim 4, wherein the brush part of the scraper of the dust cover is a hair brush. The ball nut with a dust cover as described in claim 2, wherein each positioning slot of the positioning slot group of the dust cover extends along a respective center line from the bottom of the slot toward the slot portion, and each positioning slot The intersection angles of a plane passing through the respective center lines and a reference plane passing through the axis are not equal. The ball nut with a dust cover as described in claim 1 is suitable for screwing into a lead screw, which is threaded through the shaft hole of the nut member and the inner hole of the dust cover, and has an outer surface. And a thread groove provided on the outer surface in a spirally extending manner around the axis, the scraping portion can abut the thread groove of the lead screw.