TWI495809B - Ball screw device with holding temperature function - Google Patents

Description

Ball screw device with temperature function

The present invention relates to a ball screw, and more particularly to a ball screw device having a temperature maintaining function.

Machinery is the mother of industry, motor is the life source of machinery, ball screw is the soul of transmission power, most industries need mechanical equipment as the backing, such as semiconductor, aviation, shipbuilding, medical equipment and other industries, and with the advancement of technology, Products are becoming more and more miniaturized, so precision machinery is more important. In the era of high-precision positioning and high processing efficiency, precision machine tools play an indispensable role in manufacturing. Currently, the feed system of machine tools is mainly utilized. The ball screw is used for transmission. As the precision of the product is increased, the accuracy of the ball screw as the transmission component must also be improved as it develops.

The Ball Screw converts the rotary motion of the motor into a linear motion and replaces the traditional lead screw. The biggest difference is that the ball screw rolls between the nut and the screw by using the ball, and the movement behavior of the traditional lead screw is improved from the surface contact to the point contact, which greatly reduces the frictional force and reduces the energy consumption, thereby improving the service life, positioning accuracy and mechanical efficiency. .

The ball screw element can also be called a ball screw, which mainly converts the rotary motion into a linear motion, or converts the motor output torque into an axial force. The overall structure consists of a nut, a screw, and a ball. A combination of components such as a Return pipe and a Wiper. The design is divided into an outer loop mode, an inner loop mode, and an end cap type loop mode.

Currently used in the processing of electronic products processing process The machine table is also implemented by using a ball screw 1 having a high-speed and up-and-down movement characteristic. FIG. 1 is a conventional ball screw 1 including a screw 11, a nut 12, and a plurality of balls 13, which are 11 A rolling groove 111 is disposed on the periphery thereof. The nut 12 includes a through hole 121 for the screw 11 and a rolling groove 122 disposed in the hole 121 and forming a load path a with the rolling groove 111. The plurality of balls 13 is disposed in the load path a, the ball screw 1 is positioned by the nut 12, and the screw 11 is processed downwardly through the through hole 121, and then the homing is repeated and then repeated. One action, that is, the rapid rolling up and down of the screw groove 111 of the screw 11 is separated from the rolling groove 122 of the nut 12.

Since the small-sized nut 12 is in direct contact with the plurality of balls 13, the external force load is fully applied to the nut 12, and is transmitted to the structure of the screw 11 via the plurality of balls 13, so that the nut 12 is at a high speed. During the operation, the temperature of the internal contact with the screw 11 will increase, which causes the machining error of the nut 12 due to the influence of thermal deformation. In order to no longer continue to produce the wrong working piece, the machine tool must be stopped immediately. The operation continues until the temperature of the nut 12 is cooled before continuing the operation of the machine tool.

In addition, during the high-speed operation, the screw 11 may have a problem of temperature rise and thermal deformation, which may result in poor positioning accuracy of the machine. In order to reduce the temperature rise range of the screw 11, the machine operation is affected. Before the mass production of the machine is in operation, the machine is quickly operated for a period of time and then mass-produced. The temperature of the screw 11 is raised in advance to avoid the thermal deformation caused by the continuous rising temperature of the screw 11 during the machining process, which affects the work. The dimensional error of the piece is out of the design range, but if the maintenance is required, the machine operation must be stopped first, and the production will be interrupted. After the maintenance is completed, the machine needs to be operated again to increase the temperature of the screw 11, so that not only the production operation is wasted. In the time, and the coefficient of friction of the ball screw 1 is low, it takes a long time for the screw 11 to reach a stable high temperature. In view of this, the operation of the empty machine not only does not conform to the economic effect, but also does not actually improve the heat of the ball screw 1 . The problem of deformation, all of the above factors are all when the ball screw 1 is working Stability and durability cause damage, so it really needs improvement.

Accordingly, it is an object of the present invention to provide a ball screw device having a temperature maintaining function, the ball screw device having a temperature holding function comprising a screw, a nut, a plurality of balls, and a phase change material.

An outer thread is disposed on the periphery of the screw, the nut includes a through hole for the screw sleeve, an internal thread disposed on the inner wall of the through hole, and a heat insulating passage disposed between the through hole and the side of the nut The internal thread and the external thread are screwed together to define a rolling path. The plurality of balls are disposed to move within the rolling path, and the phase change material is disposed in the insulated passage of the nut.

Another object of the present invention is to provide another ball screw device having a temperature maintaining function, the ball screw device having a temperature holding function comprising a screw, a nut, a plurality of balls, and a phase change material.

An outer thread is disposed on the periphery of the screw, and a heat insulating passage disposed on the screw, the nut includes a through hole for the screw sleeve, and an internal thread disposed on the inner wall of the through hole, the internal thread and the thread The external threads are screwed together to define a rolling path. The plurality of balls are disposed to move within the rolling path, and the phase change material is disposed in the insulated passage of the screw.

The beneficial effect of the present invention is that the phase change material is filled in the heat insulating channel by the heat insulating channel provided on the screw or the nut, and the phase change generated by the phase change material is absorbed or released. a temperature at which the screw and the nut act against each other and transition between a solid state change and a liquid change. When the phase change material undergoes a liquid change, the phase change material absorbs and removes heat from the screw and the nut When the phase change material undergoes a solid state change, the phase change material continues to exotherm to maintain the temperature of the screw and the nut, thereby reducing the temperature difference between the screw and the nut, thereby achieving a temperature difference The effect of holding the temperature makes the ball screw device with temperature function not affected by temperature and positioning accuracy Service life.

21‧‧‧ screw

211‧‧‧ external thread

212‧‧‧Second insulation channel

22‧‧‧ Nuts

221‧‧‧Perforation

222‧‧‧ internal thread

223‧‧‧First insulated channel

23‧‧‧Multiple balls

24‧‧‧ phase change materials

A‧‧‧ rolling path

1 is a schematic cross-sectional view showing a ball snail disclosed in the prior art Rod Figure 2 is a partial cross-sectional view showing the temperature-sustaining function of the present invention A phase change material in a first preferred embodiment of a ball screw device State of change; Figure 3 is a schematic cross-sectional view showing the phase in the first preferred embodiment Changing the material in a solid state; Figure 4 is a partial cross-sectional view showing the second preferred embodiment The phase change material changes in a liquid state; and Figure 5 is a schematic cross-sectional view showing the phase in the second preferred embodiment Change the material in a solid state.

The details of the related patents and the technical contents of the present invention will be apparent from the following detailed description of the preferred embodiments of the accompanying drawings.

Before the detailed description, it should be noted that similar elements are denoted by the same element numbers.

2 and 3, a first preferred embodiment of a ball screw device with a temperature holding function according to the present invention, the ball screw device with temperature holding function comprises a screw 21, a nut 22, a plurality of balls 23, and a Phase change material 24.

The outer circumference of the screw 21 is provided with an external thread 211. The nut 22 includes a through hole 221 for the screw 21, an internal thread 222 disposed on the inner wall of the through hole 221, and a hole 221 disposed therebetween. A first insulated channel 223 between the sides of the nut 22. The internal thread 222 and the external thread 211 are screwed together to define a rolling path A.

The plurality of balls 23 are circulated and moved in a rolling path A in which the internal thread 222 of the nut 22 is screwed with the external thread 211 of the screw 21, which is different from the sliding contact of the conventional screw, and the screw 21 can be made by rolling contact. Do high speed forward and reverse transmission.

The phase change material 24 is disposed in the first heat preservation passage 223 of the nut 22. The phase change material 24 has two characteristics of solid state and liquid state, and exhibits a liquid state when the ambient temperature is high, and the temperature returns to the normal temperature. When the phase change material 24 returns to a solid state, it is a material capable of achieving temperature and temperature uniformity. It is worth mentioning that the phase change material is selected from the group consisting of paraffin waxes, ester acids, hydrated salts, and the like. Made by a combination of the same. The phase change generated by the phase change material 24 absorbs or releases the temperature at which the screw 21 and the nut 22 act against each other, and transitions between a solid state change and a liquid change, when the phase change material 24 undergoes a liquid change. The phase change material 24 absorbs and removes the heat of the nut 22, and when the phase change material 24 undergoes a solid state change, the phase change material 24 continues to exotherm to maintain the temperature of the nut 22, thereby reducing The temperature difference between the screw 21 and the nut 22 acts on each other.

In the first preferred embodiment, four first heat retention channels 223 are spaced apart from the nut 22 for absorbing or releasing the temperature at which the screw 21 and the nut 22 act on each other. The number of the first insulated passages 223 may be increased or decreased as needed, and should not be limited to the first preferred embodiment.

Here, it should be noted that it is known to those skilled in the art that the first heat insulating passage 223 on the nut 22 can be completed by means of lathe punching processing, and then the phase change material 24 is filled, since The techniques well known in the art are not described in detail in the preferred embodiment.

Referring to Figures 4 and 5, a second preferred embodiment of the ball screw device with temperature function according to the present invention comprises a screw 21, a nut 22, a plurality of balls 23, and a ball screw device. Phase change material 24.

An outer thread 211 is disposed on the outer circumference of the screw 21, and a second heat insulating passage 212 is disposed on the screw 21. The nut 22 includes a through hole 221 for the screw 21, and a hole 221 is disposed on the screw hole 21. The inner thread 222 of the inner wall, wherein the inner thread 222 and the outer thread 211 are screwed together to define a rolling path A.

The plurality of balls 23 are circulated and moved in a rolling path A in which the internal thread 222 of the nut 22 is screwed with the external thread 211 of the screw 21, which is different from the sliding contact of the conventional screw, and the screw 21 can be made by rolling contact. Do high speed forward and reverse transmission.

The phase change material 24 is disposed in the second heat preservation passage 212 of the screw 21. It is worth mentioning that the phase change material 24 is selected from the group consisting of paraffin waxes, ester acids, hydrated salts, and the like. to make. The phase change generated by the phase change material 24 absorbs or releases the temperature at which the screw 21 and the nut 22 act against each other, and transitions between a solid state change and a liquid change, when the phase change material 24 undergoes a liquid change. When the phase change material 24 absorbs and removes the heat of the screw 21, when the phase change material 24 undergoes a solid state change, the phase change material 24 continues to exotherm to maintain the temperature of the screw 21, thereby lowering the screw. The temperature difference between the 21 and the nut 22 is activated by each other.

In the second preferred embodiment, four second heat insulating passages 212 are disposed on the screw 21 for absorbing or releasing the temperature at which the screw 21 and the nut 22 move with each other. The number of the second insulated passages 212 may be increased or decreased as needed, and should not be limited to the second preferred embodiment.

In summary, the ball screw device with temperature function of the present invention fills the phase change material 24 by the first heat insulating passage 223 and the second heat insulating passage 212 provided on the screw 21 or the nut 22 . The phase change generated by the phase change material 24 absorbs or releases the temperature at which the screw 21 and the nut 22 act against each other, thereby reducing the temperature difference generated and achieving the effect of holding the temperature, thereby improving the holding Warm function ball screw During the high-speed operation of the rod device, the positioning accuracy of the thermal deformation and the offset generated by the continuously rising temperature must be interrupted for maintenance, and the stability and the service life are improved, so that the object of the present invention can be achieved.

However, the above is only the two preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change of the patent application scope and the description of the invention is Modifications are still within the scope of the invention.

21‧‧‧ screw

211‧‧‧ external thread

22‧‧‧ Nuts

221‧‧‧Perforation

222‧‧‧ internal thread

223‧‧‧First insulated channel

23‧‧‧Multiple balls

24‧‧‧ phase change materials

A‧‧‧ rolling path

Claims (6)

A ball screw device with a temperature-holding function, comprising: a screw having an external thread at a periphery thereof; a nut comprising a perforation for the screw sleeve, an internal thread disposed on the inner wall of the perforation, and a setting An insulated passage between the perforation and the side of the nut, the internal thread and the external thread are screwed together to define a rolling path; a plurality of balls are disposed to move in the rolling path; and a nut is disposed on the nut a phase change material in the heat retention passage, a phase change generated by the phase change material to absorb or release a temperature at which the screw and the nut move to each other, and transition between a solid state change and a liquid change, when the phase changes When the material changes in a liquid state, the phase change material absorbs and removes the heat of the nut. When the phase change material changes in a solid state, the phase change material continues to exotherm to maintain the temperature of the nut, thereby reducing the The temperature difference between the screw and the nut acting on each other. A ball screw device with a temperature-maintaining function according to claim 1, wherein the nut has a plurality of insulated passages disposed at intervals. A ball screw device with a temperature-maintaining function according to claim 2, wherein the phase change material is selected from the group consisting of paraffin waxes, ester acids, hydrated salts, and the like. A ball screw device with a temperature holding function, comprising: a screw having an external thread at a periphery thereof and a heat insulating passage disposed on the screw; a nut including a through hole for the screw sleeve, and an internal thread disposed on the inner wall of the through hole, the internal thread Cooperating with the external thread to define a rolling path; a plurality of balls disposed to move in the rolling path; and a phase change material disposed in the insulated channel of the screw, a phase change generated by the phase change material, In order to absorb or release the temperature at which the screw and the nut act against each other, and between the solid state change and the liquid change, when the phase change material undergoes a liquid change, the phase change material absorbs and takes away the screw. Heat, when the phase change material undergoes a solid state change, the phase change material will continue to exotherm to maintain the temperature of the screw, thereby reducing the temperature difference between the screw and the nut. A ball screw device with a temperature-maintaining function according to claim 4, wherein the screw has a plurality of insulated passages disposed at intervals. A ball screw device having a temperature-maintaining function according to claim 5, wherein the phase change material is selected from the group consisting of paraffin waxes, ester acids, hydrated salts, and the like.