TWM557792U - Ball screw with silencing function - Google Patents

Abstract

The present invention is a ball screw with a silencing function, comprising: a screw, a nut sleeved on the screw in the axial direction, and a receiving ring groove recessed in the axial direction; and a silencing element disposed on the Having a ring groove and nested in the screw, and having an annular ring portion, a spiral tooth portion connecting the ring portion and attached to the outer spiral channel, and a plurality of cavities disposed in the ring portion, And a plurality of sound guiding channels respectively communicating with the cavity, each of the sound guiding channels having a channel opening communicating with the cavity, and an aperture opening opposite to the channel opening and facing the screw toroid or the outer spiral channel . When the ball screw is activated, the sound energy generated by the ball screw will resonate with the air in the cavity and be eliminated, so as to reduce the noise.

Description

Ball screw with silencer function

The novel is related to a ball screw, in particular to a ball screw with a sound absorbing function.

At present, there is a need to control the movement of the platform or the processing components in precision machinery. Because the ball screw has a very low friction coefficient and high mechanical transmission efficiency, most of them use a ball screw device to drive, but when the ball screw is in transmission, the ball When rolling between the screw and the nut and moving in the circulation system, there is a considerable amount of noise.

Referring to FIG. 1 , a perspective view of a ball screw showing a muffling function of a tool is mainly provided on the screw 11 with a plurality of perforated plates 12 , 13 , 14 having different shapes and irregular planes, and each of the perforated plates 12, 13, 14 are locked on the nut 16 by screws 15, and the sound generated by the ball screw is offset by the sound and sound reflection by the irregular plane. However, the structure design is not good in the sound elimination effect. In addition, it is less likely to eliminate a specific frequency and increase the axial length of the nut 16 to shorten the displacement travel of the work.

On the other hand, the JP2006336684 patent provides a guide member which mainly steals meat from a circulation fitting (end plug) and fills a filler (polyurethane resin type expansion agent) to reduce vibration and noise. JP1996303460 discloses a rolling guiding device which mainly fills the cover body with a core layer made of a second resin in a hermetically sealed outer casing layer made of a first resin, wherein the first resin has Wear resistance, while the second resin has sound absorbing properties to reduce noise. The JPU_1992117211 patent provides a linear motion rolling guide unit which mainly adds a filler to a space portion between the side plates to achieve a noise reduction effect. However, these patents have been silenced by adding filler materials, thus resulting in an increase in material costs and the inability to eliminate specific frequencies.

The purpose of the present invention is to provide a ball screw with a sound absorbing function, which mainly has a better sound absorbing effect.

A further object of the present invention is to provide a ball screw with a muffling function that eliminates noise at a specific frequency.

Another object of the present invention is to provide a ball screw with a sound absorbing function, which mainly affects the displacement stroke without increasing the axial length of the nut on the basis of a better sound absorbing effect.

A further object of the present invention is to provide a ball screw having a sound absorbing function, which can have a better sound absorbing effect without adding a filler material.

In order to achieve the foregoing object, the present invention is a ball screw with a sound absorbing function, comprising: a screw having an axis, a screw torus surrounding the axis, and an outer spiral groove spirally recessed around the screw ring surface around the axis a nut is sleeved on the screw along the axis direction, and includes an inner spiral groove spirally disposed inside the axis, and a receiving recessed in one end surface of the nut along the axial direction a ring groove, and the inner spiral channel and the outer spiral channel form a load path for accommodating a plurality of balls; and a sound absorbing member disposed along the axis direction in the accommodating ring groove and sleeved on the screw a ring-shaped ring portion, a spiral tooth portion connecting the ring portion, a plurality of cavities disposed in the ring portion, and a plurality of sound guiding passages respectively communicating with the cavity body, the ring portion having an outer ring surface, and An inner annular surface opposite to the outer annular surface, the spiral tooth portion is disposed on the inner annular surface and is attached to the outer spiral groove, each of the sound guiding passages has a passage opening communicating with the cavity, and a Opposite the passage opening and facing the screw toroid or outer spiral groove Pore mouth.

Preferably, the cross-sectional width of the cavity along the axis is greater than the cross-sectional width of the sound guiding channel along the axis.

Preferably, the following relationship is met:

.

Preferably, the volume of each of the cavities is uniform.

Preferably, the volume of each of the cavities is inconsistent.

Preferably, the nut has two receiving ring grooves respectively recessed on both end faces of the nut, and the number of the sound absorbing members is two, respectively disposed on the two sides of the nut along the axis direction. The ring groove is accommodated and is simultaneously placed on the screw.

Accordingly, the present invention provides a ball screw having a muffling function, which is provided with a plurality of cavities mainly in a sound absorbing member added to one end of the nut, so that the sound of the ball screw when actuated through the aperture port, the guide When the sound channel is transmitted to each of the cavities, the sound energy resonates with the air in the cavity and is eliminated, thereby achieving the effect of reducing noise.

Referring to FIG. 2 to FIG. 6 , the present embodiment provides a ball screw with a sound absorbing function, which is mainly composed of a screw 20 , a nut 30 , and two sound absorbing members 40 , wherein:

The screw 20 has an axis 21, a screw annulus 22 surrounding the axis 21, and an outer spiral channel 23 spirally recessed about the axis 21 of the screw annulus 22.

The nut 30 is sleeved on the screw 20 in the direction of the axis 21, and includes an inner spiral channel 31 spirally disposed inside the axis 21, and two recesses are respectively disposed on the nut 30 along the axis 21 direction. The two end faces accommodate the annular groove 32, and the inner spiral channel 31 and the outer spiral channel 23 form a load path for accommodating a plurality of balls 91, and a circulation element 92 is disposed in the load path.

Since the screw 20, the nut 30, the ball 91, and the circulating element 92 are assembled in a conventional manner, and the manner of actuation thereof is the same as that of the prior art, it is not the focus of the present invention. Therefore, for the components (refer to the screw 20 and the screw) The detailed structure, assembly method and actuation mode of the cap 30, the ball 91, and the circulating element 92) provided in the nut 30 will not be described in detail.

The two muffling elements 40 are formed by the two muffling ring bodies 40A and 40B. The muffling elements 40 are respectively disposed on the two sides of the nut 30 in the direction of the axis 21, and are simultaneously sleeved. The screw 20 has an annular ring portion 41, a spiral tooth portion 42 connecting the ring portion 41, a plurality of cavities 43 disposed in the ring portion 41, and a plurality of cavities 43 respectively communicating with the cavities 43. The sound guiding channel 44 has an outer annular surface 411 and an inner annular surface 412 opposite to the outer annular surface 411. The spiral tooth portion 42 is disposed on the inner annular surface 412 and is attached thereto. The outer spiral channel 23, each of the sound guiding channels 44 has a passage opening 441 communicating with the cavity 43, and an aperture opening opposite to the passage opening 441 and facing the screw annulus 22 or the outer spiral channel 23. 442, and a portion of each of the apertures 442 extends through the inner annular surface 412, a portion of the plurality of apertures 442 extends through the helical portion 42 and a portion thereof extends between the inner annular surface 412 and the helical portion 42. In this embodiment, each The volume of the cavity 43 is uniform, and of course, can be designed into different volume types according to requirements, and the cross-sectional width of each cavity 43 along the axis 21 is greater than Sound guiding channel 44 cross-sectional width along the axis 21; Further, in this embodiment a ball screw having the silencing function of the present embodiment, conform to the following relationship: . The main purpose of this relationship is to limit the frequency range, and the frequency range that can be recognized by the human ear is 20-20000 Hz. The volume of the cavity, the size of the aperture, and the length of the conduction channel are derived according to the Holm's theoretical formula.

The above description is the configuration description of each main component of the embodiment of the present invention. The mode of operation and efficacy of the present invention are described below.

When the ball screw is actuated, the ball 91 rolls between the screw 20 and the nut 30 and the sound generated when the circulating member 92 moves is transmitted by the screw 20, and the sound absorbing member 40 and the screw 20 are The aperture port 422 enters the sound guiding channel 44 and enters the cavity 43 via the guiding of the sound guiding channel 44. At this time, the sound energy resonates with the air in the cavity 43 and is eliminated, thereby reducing noise. The effect.

It should be noted that, in the present invention, each of the sound absorbing members 40 is disposed on the two sides of the nut 30 in the direction of the axis 21, and is sleeved on the screw 20 at the same time, and each has a fit. In the spiral tooth portion 42 of the outer spiral groove 23, in addition to the sound absorbing function, each of the sound absorbing members 40 can prevent external dust or dust from entering the inside of the nut 30, and has a dustproof function. Each of the muffling elements 40 in the creation can be regarded as a wiper. In addition, referring to the experimental data diagram shown in FIG. 7, the sound time-frequency diagram of the present invention and the conventional ball screw operating under the same conditions are described, in particular, the cavity 43 and the sound guiding channel are provided for the general squeegee and the original creation. 44 and the time-frequency ratio of the sound absorbing element 40 of the aperture port 442. From the figure, it can be seen that the sound energy is reduced by about 30%, and the overall noise amount is effectively reduced, and the following table differences are further included:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b><u>Broadband Difference Ratio</u></b></td ><td> General Scraper</td><td> The Silencing Element of this Creation</td></tr><tr><td> Measured Sound Pressure (dB) </td><td><u >70.8</u></td><td><u>68.1</u></td></tr><tr><td> Energy difference (dB) </td><td><u> 2.7</u> (The human ear can usually distinguish the decibel value by about 2dB) </td></tr></TBODY></TABLE>

In addition, this creation has the following effects.

First, effectively eliminate the abnormal sound energy of each frequency band. Since the volume of each cavity 43 of the present creation may be the same or different, the present invention can design different volume of cavity 43 according to different noise frequencies, thereby effectively eliminating the abnormal sound energy of each frequency band, so that the ball screw can effectively eliminate each The effect of the band's noise energy, and the relationship between the frequency band and the cavity volume is: . For example:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td></td><td> First example</td><td> Second example ( Low frequency) </td><td> Third example (high frequency) </td></tr><tr><td> Cavity volume (mm³) </td><td > 110 </td><td> 300000 </td><td> 3 </td></tr><tr><td> pore size (mm²) </td> <td> 0.78 </td><td> 0.13 </td><td> 0.196 </td></tr><tr><td> Guiding channel length (mm) </td><td> 2 < /td><td> 3 </td><td> 0.5 </td></tr></TBODY></TABLE>

The above table mainly states that the present invention is used to eliminate special frequency bands (such as the first example frequency is 3225 Hz, the second example is low frequency, the frequency is 20.5 Hz, and the third example is high frequency, the frequency is 19778 Hz), cavity volume, pores The relationship between the size of the port 442 and the length of the sound guiding channel 44 can be used to meet different needs. For example, if the frequency of the main noise of a screw is 3000 Hz, the ball screw can be designed to eliminate the abnormal sound through the relationship between the cavity volume, the length of the sound guiding channel 44 and the size of the aperture 442, so that the ball screw can be reached. Low noise characteristics.

Secondly, under the basis of better sound-absorbing effect, the axial length of the nut 30 is not increased and the displacement stroke is affected. The nut 30 of the present invention has two receiving ring grooves 32 respectively recessed on both end faces of the nut 30 in the direction of the axis 21, and the two sound absorbing members 40 are respectively disposed on the nut 30 along the axis 21 direction. The two sides of the nut 32 are disposed on the two sides of the nut 30. Therefore, the two muffling elements 40 are provided with a better noise cancellation effect. It does not increase the axial length of the nut 30 and affects the displacement stroke.

Third, it does not need to add a filler material to have a better sound-absorbing effect. The muffling effect of the present invention is mainly to design the cavity 43 and the hollowing out of the sound guiding channel 44, and the structure of the aperture opening 442 formed between the screwing unit 40, and enter the cavity by sound energy. After the body 43, the air in the cavity 43 is resonated and eliminated to achieve the effect of reducing noise. Therefore, the present invention can have a better noise reduction effect without adding a filler material.

In summary, the above embodiments and drawings are only preferred embodiments of the present invention. When the scope of the present invention cannot be limited thereto, the equivalent changes and modifications made by the scope of the patent application of the present invention should be This creative patent covers the scope.

[知知]
11‧‧‧ screw
12, 13, 14‧‧‧ perforated plate
15‧‧‧ screws
16‧‧‧ Nuts [this creation]
20‧‧‧ screw
21‧‧‧ axis
22‧‧‧ screw torus
23‧‧‧External spiral channel
30‧‧‧ Nuts
31‧‧‧inner spiral channel
32‧‧‧ accommodate ring groove
40‧‧‧Damping components
40A, 40B‧‧‧Muffling ring
41‧‧‧ Ring Department
411‧‧‧ outer annulus
412‧‧‧ Inner torus
42‧‧‧Spiral teeth
43‧‧‧ cavity
44‧‧‧Guide channel
441‧‧‧ passage
442‧‧‧ aperture port
91‧‧‧ balls
92‧‧‧cycle components

1 is a perspective view of a ball screw of a muffler function; FIG. 2 is an exploded perspective view showing a state in which the muffler elements are separated; FIG. 3 is a perspective assembled view of the present embodiment; FIG. Figure 5 is a partial enlarged view of Figure 4; Figure 6 is a cross-sectional view of the line 6-6 of Figure 3; Figure 7 is an experimental data diagram of the present embodiment, illustrating the creation and conventional ball screw Time-frequency diagram of sound when operating under the same conditions.

Claims (6)

A ball screw with a muffling function, comprising: a screw having an axis, a screw torus surrounding the axis, and an outer spiral channel spirally recessed around the axis of the screw; a nut along the The axial direction is sleeved on the screw, and includes an inner spiral groove spirally disposed inside the axis, and a receiving ring groove recessed in one end surface of the nut along the axial direction, and the inner spiral groove a channel and the outer spiral channel form a load path for accommodating a plurality of balls; and a sound absorbing member disposed in the accommodating ring groove along the axis direction and sleeved on the screw, and having an annular ring portion, a spiral tooth portion connecting the ring portion, a plurality of cavities disposed in the ring portion, and a plurality of sound guiding passages respectively communicating with the cavity portion, the ring portion having an outer ring surface and a reverse inner ring surface The inner annular surface is disposed on the inner annular surface and is attached to the outer spiral channel, each of the sound guiding passages has a passage opening communicating with the cavity, and a surface opposite to the passage opening The aperture of the screw toroid or the outer spiral channel. A ball screw having a muffling function according to claim 1, wherein a cross-sectional width of the cavity along the axis is greater than a cross-sectional width of the sound guiding channel along the axis. A ball screw having a muffling function as claimed in claim 1, wherein the following relationship is satisfied: . The ball screw having the muffling function according to claim 1, wherein the volume of each of the cavities is uniform. The ball screw having the muffling function according to claim 1, wherein the volume of each of the cavities is inconsistent. The ball screw having the muffling function according to claim 1, wherein the nut has two receiving ring grooves respectively recessed on both end faces of the nut, and the number of the sound absorbing members is two, respectively The axial direction is disposed on the two sides of the nut to accommodate the ring groove and is simultaneously sleeved on the screw.