TWI671479B - Ball screw set and method of use thereof - Google Patents

Abstract

A ball screw assembly mainly includes: a screw having a spiral screw groove on an outer surface thereof; a first nut group having a first nut and a plurality of first balls; The first nut has a first perforation. The inner surface of the first perforation has a first nut groove in a spiral shape. The first balls are placed in the first nut groove. A ball contacts the inner wall surface of the groove of the first nut at a predetermined contact angle; a second nut group has a second nut and a plurality of second balls, and the second nut has a first Two perforations. The inner surface of the second perforation has a spiral second nut groove. The second balls are placed in the second nut groove. The second balls and the second nut are The inner wall surfaces of the cap grooves contact at a predetermined contact angle, and the contact angle of the second nut group is different from the contact angle of the first nut group; thereby, the first nut group and the second nut group are connected. It is used alone with the screw in a replacement manner, so that the first nut group grinds a first wear track on the first screw The second nut group grinds a second wear trajectory on the screw, and the first wear trajectory and the second wear trajectory do not overlap each other; thereby, the number of repeated use of the screw can be effectively increased, and the screw can be extended. Service life to achieve cost reduction.

Description

Ball screw group and using method thereof

The present invention relates to a ball screw, and more specifically to a ball screw assembly and a method of using the same.

The main components of a ball screw are a screw, a nut, and most of the balls (steel balls) and other accessories. It uses the rotation of the screw to drive the ball to make cyclic rolling contact between the screw and the nut, so that the nut turns into a straight line. Moving mechanical transmission components, because the ball screw has high positioning accuracy, long life, low pollution, can be used for high-speed forward and reverse transmission and change transmission, etc., so the ball screw has gradually become the positioning and measurement of precision technology industry and precision machinery industry recently One of the important components on the system.

In order to improve the accuracy of the ball screw, the ball screw is given a certain pre-pressure during assembly, so that the ball is in close contact with the screw and the nut at a preset contact angle. After its use for a period of time, not only the ball itself will Wear, the position where the screw and the nut are in contact with the ball (preset contact angle position) will also produce a track of wear, which will cause problems such as reduced positioning accuracy and poor transmission smoothness.

Here, the general method will replace the entire set of ball screws, that is, screws, nuts, balls and other accessories, and replace them with new ball screws to ensure positioning accuracy and smooth transmission. However, this will increase the maintenance cost of the equipment. Since the screw is the most difficult part to process, its cost is also the most expensive. If it is replaced too frequently, the cost of the industry will increase, and the screw cannot be effectively used. .

In view of this, the main purpose of the present invention is to provide a ball screw assembly and a method for using the same, which can effectively increase the number of times the screw is reused, thereby extending the life of the screw to achieve the effect of reducing costs.

Another object of the present invention is to provide a ball screw assembly and a method for using the same, which can extend the service life of the screw.

For this reason, the present invention provides a ball screw assembly, which mainly includes: a screw having a spiral screw groove on its outer surface; a first nut group having a first nut and a group The plurality of first balls, the first nut has a first perforation, the inner surface of the first perforation has a first nut groove in a spiral shape, and the first balls are placed on the first nut In the groove, the first balls contact the inner wall surface of the first nut groove at a predetermined contact angle. The ball contact angle on the half side of the first nut groove and the ball contact angle on the other half is Reverse direction; a second nut group having a second nut and a plurality of second balls, the second nut has a second perforation, and the inner surface of the second perforation has a spiral-shaped first Two nut grooves, the second balls are placed in the second nut grooves, the second balls contact the inner wall surface of the second nut grooves at a predetermined contact angle, and the second nut The contact angle of the ball on the half of the cap groove and the contact angle of the ball on the other half are opposite, and the The contact angle is different from the contact angle of the first nut group; by this, the first nut group and the second nut group are used alone with the screw in a replacement manner, so that the first nut group is in the first A first wear track is ground on a screw, and a second wear track is ground on the screw by the second nut group, and the first wear track and the second wear track do not overlap with each other; Service life to reduce maintenance costs.

The present invention further provides a method for using a ball screw assembly, which mainly includes the following steps: taking a screw having a spiral groove on the outer surface of the screw; taking a first nut group, the first The nut group has at least a first nut and a plurality of first balls, and the first nut The cap has a first perforation, the first perforation is for the screw to pass through, the inner surface of the first perforation has a first nut groove in a spiral shape, and the first balls are placed on the first nut In the groove and the screw groove, the first balls contact the inner wall surface of the first nut groove and the inner wall surface of the screw groove at a predetermined contact angle, and the balls on the half side of the first nut groove The contact angle is opposite to the contact angle of the ball on the other half; take a second nut group for backup, the second nut group has at least one second nut and a plurality of second balls, and the second nut The cap has a second perforation. The inner surface of the second perforation has a second nut groove in a spiral shape. The second balls are placed in the second nut groove. The second balls and The inner wall surfaces of the second nut groove are in contact with each other at a predetermined contact angle. The ball contact angle on one half of the second nut groove and the ball contact angle on the other half are opposite. The contact angle is different from the contact angle of the first nut group; when the first nut group grinds a first wear track on the screw , Detach the first nut group from the screw, and replace the second nut group with the screw for assembly and use, the second nut group grinds a second wear track on the screw, and the The first wear trajectory and the second wear trajectory do not overlap each other; thereby extending the service life of the screw to reduce maintenance costs.

"First embodiment"

100‧‧‧ Ball Screw Set

90‧‧‧Screw

91‧‧‧Screw groove

10‧‧‧The first nut group

11‧‧‧first nut

111‧‧‧ first perforation

112‧‧‧The first nut groove

12‧‧‧ the first ball

20‧‧‧Second nut set

21‧‧‧Second nut

211‧‧‧second perforation

212‧‧‧Second nut groove

22‧‧‧Second Ball

30‧‧‧The third nut group

31‧‧‧third nut

311‧‧‧ third perforation

312‧‧‧Third nut groove

32‧‧‧ The third ball

13‧‧‧First wear track

23‧‧‧Second Wear Track

33‧‧‧Third wear track

`` Second Embodiment ''

200‧‧‧ Ball Screw Set

90‧‧‧Screw

91‧‧‧Screw groove

40‧‧‧The first nut group

41‧‧‧first nut

42‧‧‧The first ball

50‧‧‧Second nut set

51‧‧‧Second nut

52‧‧‧Second ball

60‧‧‧The third nut group

61‧‧‧third nut

62‧‧‧The third ball

43‧‧‧First wear track

44‧‧‧Fourth wear track

53‧‧‧Second wear track

54‧‧‧Fifth wear track

63‧‧‧Third wear track

64‧‧‧Sixth wear track

The first figure is a schematic diagram of the configuration of the screw, the nut, and the ball according to the first preferred embodiment of the present invention.

The second figure is a schematic sectional view of the embodiment shown in the first figure.

The third diagram is a schematic diagram of the abrasion of the screw in the embodiment shown in the first diagram.

The fourth diagram is an assembly diagram of the embodiment shown in the first diagram.

The fifth diagram is an assembly diagram of the embodiment shown in the first diagram.

The sixth diagram is an assembly diagram of the embodiment shown in the first diagram.

The seventh diagram is a schematic diagram of the screw wear in the embodiment shown in the first diagram.

The eighth figure is a schematic diagram of the configuration of the screw, the nut, and the ball according to the second preferred embodiment of the present invention.

The ninth figure is an assembly diagram of the embodiment shown in the eighth figure.

The tenth figure is an assembly schematic diagram of the embodiment shown in the eighth figure.

The eleventh figure is an assembly diagram of the embodiment shown in the eighth figure.

The twelfth figure is a schematic view of the screw wear in the embodiment shown in the eighth figure.

In order to allow your reviewers to further understand and agree with the features and characteristics of the present invention, the following embodiments are listed and illustrated with drawings as follows: Please refer to the first to seventh figures, which is a ball screw assembly 100 provided by the first preferred embodiment of the present invention, which mainly includes a screw 90, a first nut group 10, a second nut group 20 and A third nut group 30, wherein: Referring to the first and second figures, the screw 90 has a screw groove 91 in a spiral shape on an outer surface thereof.

Please refer to the first and second figures. The first nut group 10 has a first nut 11 and a plurality of first balls 12. The first nut 11 has a first hole 111. The inner surface of a perforation 111 has a first nut groove 112 in a spiral shape. The first balls 12 are a majority of steel balls. The first balls 12 are disposed on the first nut of the first nut 11. In the cap groove 112, the contact angle between the first balls 12 and the inner wall surface of the first nut groove 112 is 40 degrees, and the contact angle of the balls 12 on one side of the nut groove 112 and the balls on the other half The contact angle is reversed (as shown in the first figure).

Please refer to the fifth figure. The second nut group 20 has a second nut 21 and a plurality of second balls 22. The second nut 21 has a second hole 211. The inner surface has a second nut groove 212 in a spiral shape. The second balls 22 are a majority of steel balls. The second balls 22 are placed in the second nut grooves 212 of the second nut 21. Inside, the second balls 22 and the The contact angle of the inner wall surface contact of the second nut groove 212 is 50 degrees, and the contact angle of the balls 22 on the half side of the nut groove 212 and the ball contact angle of the other half are opposite.

Please refer to the sixth figure. The third nut group 30 has a third nut 31 and a plurality of third balls 32. The third nut 31 has a third hole 311. The inner surface has a third nut groove 312 in a spiral shape, the second balls 32 are a majority of steel balls, and the third balls 32 are placed in the third nut groove 312 of the third nut 31 Here, the contact angle between the third ball 32 and the inner wall surface of the third nut groove 312 is 60 degrees, and the contact angle between the ball 32 on one side of the nut groove 312 and the ball on the other half is Reverse.

Therefore, the above is the introduction of the components of the ball screw set 100 provided by the first preferred embodiment of the present invention, and then the assembly method and its use characteristics are introduced as follows: First, take the screw 90 and insert the screw 90 into the first hole 111 of the first nut group 10. The first ball 12 is located in the screw groove 91 of the screw 90 and the first nut 11. In the first nut groove 112, a pre-pressure is applied to the screw 90 and the first nut group 10, so that the first ball 12 and the inner wall surface of the screw groove 91 of the screw 90 and the first wall The inner wall surfaces of the first nut groove 112 of a nut 11 are in close contact (as shown in the fourth figure), and the contact angle is 40 degrees. The second nut group 20 and the third nut group 30 are reserved.

After the screw 90 and the first nut group 10 are used for a period of time, both sides of the inner wall surface of the screw groove 91 of the screw 90 are worn by the first ball 12 to form a first wear track 13 (such as the second As shown in Figures 3 and 3), the inner wall surface of the first nut groove 112 of the first nut 11 is also worn away from the trajectory. When the machining accuracy deteriorates, the first nut group 10 can be removed from the screw. Take off at 90.

Next, the screw 90 is inserted into the second hole 211 of the second nut group 20, and the second ball 22 is located in the screw groove 91 of the screw 90 and the second nut groove of the second nut 21 In the groove 212, a pre-pressure is applied to the screw 90 and the second nut group 20, so that the second ball 22 and the screw 90 The inner wall surface of the screw groove 91 and the inner wall surface of the second nut groove 212 of the second nut 21 are in close contact (as shown in the fifth figure), and the contact angle is 50 degrees.

After the screw 90 and the second nut group 20 are used for a period of time, both sides of the inner wall surface of the screw groove 91 of the screw 90 are worn by the second ball 22 to form a second wear track 23 (as shown in the seventh figure) (Shown), the inner wall surface of the second nut groove 212 of the second nut 21 is also worn out of the track, and when the machining accuracy is deteriorated, the second nut group 20 can be taken from the screw 90 And the second wear track 23 on the screw 90 does not overlap the first wear track 13.

Finally, the screw 90 is inserted into the third hole 311 of the third nut group 30, and the third ball 32 is located in the screw groove 91 of the screw 90 and the third nut groove of the third nut 31 In the groove 312, a pre-pressure is applied to the screw 90 and the third nut group 30, so that the third ball 32 and the inner wall surface of the screw groove 91 of the screw 90 and the first wall of the third nut 31 The inner wall surfaces of the three nut grooves 312 are in close contact (as shown in the sixth figure), and the contact angle is 60 degrees.

After the screw 90 and the third nut group 30 are used for a period of time, both sides of the inner wall surface of the screw groove 91 of the screw 90 are worn by the third ball 32 to form a third wear track 33 (as shown in the seventh figure) (Shown), the inner wall surface of the third nut groove 312 of the third nut 31 is also worn, and when the machining accuracy is deteriorated, the third wear track 33 on the screw 90 is not the same as the first wear track 13 And overlap with the second wear trajectory 23, the screw 90 and the third nut group 30 can be removed, and a ball screw group 100 can be replaced again.

Therefore, in the present invention, the contact angle of the first nut group 10 is 40 degrees, the contact angle of the second nut group 20 is 50 degrees, and the contact angle of the third nut group 30 is 60 degrees. The first and second wear trajectories 13, 23, and 33 are worn out by the screw 90, and the first, second, and third wear trajectories 13, 23, and 33 do not overlap. Therefore, the screw 90 in the present invention can be used with the first nut group 10, the second nut group 20, and the third nut group 30, respectively. It will not affect the positioning accuracy, and can extend the service life of the screw 90 by three times, so as to greatly reduce the maintenance cost of replacing the screw 90.

Please refer to FIG. 8 to FIG. 12, which are a ball screw set 200 provided in the second preferred embodiment of the present invention. The ball screw set 200 includes a screw 90, a first nut set 40, and a second screw. Nut group 50 and a third nut group 60, but the main differences between them are:

In this embodiment, the first nut group 40 adopts a double nut type, that is, the first nut group 40 has two first nuts 41 and two first balls 42 connected to each other. The contact angle between each first nut 41 and each first ball 42 is 40 degrees, and the contact angle between a first nut 41 and a first ball 42 and the other first nut 41 and another The contact angle of the first ball 42 is reversed (as shown in the ninth figure).

The second nut group 50 adopts a double nut type, that is, the second nut group 50 has two interconnected second nut 51 and two sets of plural second balls 52, and each of the second nut 51 The contact angle with each second ball 52 is 50 degrees, and the contact angle between a second nut 51 and a second ball 52 is in contact with the other second nut 51 and another second ball 52 The angle system is reversed (as shown in the tenth figure).

The third nut group 60 adopts a double nut type, that is, the third nut group 60 has two third nuts 61 and two third balls 62 connected to each other, and each third nut 61 The contact angle with each third ball 62 is 60 degrees, and the contact angle between a third nut 61 and a third ball 62 is in contact with the other third nut 61 and another third ball 62 The angle system is reversed (as shown in Figure 11).

Therefore, after using the screw 90 with the first nut group 40 for a period of time, a first wear track 43 and a fourth wear track 44 are worn on the screw 90. After using the screw 90 with the second nut group 50 for a period of time, a second wear trajectory 53 and a fifth wear trajectory 54 are worn on the screw 90, and the screw 90 is matched with the third nut group 60 After a period of use, a third wear trajectory 63 and a sixth wear trajectory 64 will be worn on the screw groove 91 of the screw 90, and the The first wear trajectory 43, the fourth wear trajectory 44, the second wear trajectory 53, the fifth wear trajectory 54, the third wear trajectory 63, and the sixth wear trajectory 64 do not overlap each other (as shown in the twelfth figure).

In this way, the ball screw set and the use method provided by the present invention can be applied not only to the type of single nut, but also to the type of double nut, which can make it more widely used and can effectively use it. The screw 90 is repeatedly used multiple times, and the life of the screw 90 is extended.

The above disclosure is only the preferred embodiments provided by the present invention, and is not intended to limit the scope of implementation of the present invention. Any equivalent changes made by those skilled in the art in accordance with the present invention should belong to the present invention. Coverage.

Claims (11)

A ball screw assembly mainly includes: a screw having a spiral screw groove on an outer surface thereof; a first nut group having a first nut and a plurality of first balls; The first nut has a first perforation. The inner surface of the first perforation has a first nut groove in a spiral shape. The first balls are placed in the first nut groove. A ball contacts the inner wall surface of the first nut groove at a predetermined contact angle, and the ball contact angle on the half side of the first nut groove and the ball contact angle on the other half are opposite; a second screw A cap group having a second nut and a plurality of second balls, the second nut has a second perforation, and the inner surface of the second perforation has a second nut groove having a spiral shape. The second ball is placed in the second nut groove, the second balls contact the inner wall surface of the second nut groove at a predetermined contact angle, and the balls on the half side of the second nut groove The contact angle is opposite to the contact angle of the ball on the other half; and the contact angle of the second nut group and the first nut group The contact angles are different; therefore, the first nut group and the second nut group are used alone with the screw in a replaceable manner, so that the first nut group is on two of the inner wall surface of the screw groove of the screw. A first wear trajectory is ground on each side, and a second wear trajectory is ground on each side of the inner wall surface of the screw groove of the screw of the second nut group, and the first wear trajectory and the second wear trajectory do not overlap each other. . According to the ball screw set described in the first item of the patent application scope, the ball screw set further includes a third nut set, the third nut set has a third nut and a plurality of third ball sets, and the third nut has A third perforation. The inner surface of the third perforation has a third nut groove in a spiral shape. The third balls are placed in the third nut groove. The inner wall surfaces of the three nut grooves are in contact with each other at a predetermined contact angle. The ball contact angle on the half side of the third nut groove and the ball contact angle on the other half are opposite; and the contact angle of the third nut group. The contact angle is different from the contact angle of the first nut group and the second nut group; the first nut group, the second nut group, and the third nut group are used alone with the screw in a replacement manner, The first nut group is ground to the first wear track on both sides of the inner wall surface of the screw groove of the screw, and the second nut group is ground to the two sides of the inner wall surface of the screw groove of the screw. Two wear trajectories, the third nut group grinds a third wear trajectory on each side of the inner wall surface of the screw groove of the screw And the first wear trajectory, the second wear trajectory and the third wear trajectory do not overlap each other. According to the ball screw assembly according to item 2 of the scope of the patent application, wherein the contact angle between the first balls and the inner wall surface of the first nut groove is 40 degrees, and the second balls and the second nut The contact angle of the inner wall surface of the groove is 50 degrees, and the contact angle of the third ball and the inner wall surface of the third nut groove is 60 degrees. A ball screw group mainly comprises: a screw having a spiral screw groove on an outer surface thereof; a first nut group having two first nuts and a plurality of first balls in two groups; two The first nut is connected in one body. Each first nut has a first perforation. The inner surface of each first perforation has a first nut groove in a spiral shape, and the two sets of first balls. It is placed in the corresponding first nut groove, and the first balls of each group are in contact with the inner wall surface of the corresponding first nut groove at a predetermined contact angle; The contact angle between the nut and a first ball is opposite to the contact angle between the other first nut and the other first ball; a second nut group having two second nuts and two groups A plurality of second balls, two second nuts are connected together, each second nut has a second perforation, and an inner surface of each second perforation has a second nut groove having a spiral shape, the The two sets of the plurality of second balls are placed in the corresponding second nut grooves, and the sets of the second balls and the corresponding first balls The inner wall surfaces of the nut grooves are in contact with each other at a predetermined contact angle; the contact angle between a second nut and a second ball of a second nut group is between the other second nut and another second ball The contact angle of the second nut group is different from the contact angle of the first nut group; by this, the first nut group and the second nut group are replaced with each other independently The screw is used in combination to make the first nut group on the two sides of the inner wall surface of the screw groove of the screw grind a first wear trajectory and a fourth wear trajectory, and the second nut group is on the screw screw of the screw. A second wear trajectory and a fifth wear trajectory are ground on both sides of the groove inner wall surface, and the first wear trajectory, the fourth wear trajectory, the second wear trajectory, and the fifth wear trajectory do not overlap each other. According to the ball screw set described in item 4 of the scope of the patent application, it further includes a third nut set, the third nut set has two third nuts and two sets of plural third balls, and two third nut sets Connected together, each third nut has a third perforation, and the inner surface of each third perforation has a third nut groove in a spiral shape. The two sets of plural third balls are placed on the corresponding In the third nut groove, each group of third balls contacts the inner wall surface of the corresponding third nut groove at a predetermined contact angle; one of the third nut group and the third nut and one The contact angle between the third balls is opposite to the contact angle between the other third nut and another third ball; and the contact angle between the third nut group and the contact angle between the first nut group and the second The contact angle of the nut group is different; the first nut group, the second nut group, and the third nut group are used alone with the screw in a replacement manner, so that the first nut group is in the screw of the screw The first wear trajectory and the fourth wear trajectory are ground on both sides of the inner wall surface of the screw groove. The second nut group is in the screw groove of the screw. The second wear trajectory and the fifth wear trajectory are ground on both sides of the inner wall surface, and the third nut group is ground on the third wear trajectory and the sixth wear trajectory on both sides of the inner wall surface of the screw groove of the screw. And the first wear track, the fourth wear track, the second wear track, the fifth wear track, the third wear track, and the sixth wear track do not overlap each other. According to the ball screw assembly described in item 4 of the scope of patent application, wherein the contact angle between the first balls and the inner wall surface of the groove of the first nut is 40 degrees, and the second balls and the second nut The contact angle of the inner wall surface of the groove is 50 degrees, and the contact angle of the third ball and the inner wall surface of the third nut groove is 60 degrees. A method for using a ball screw group, which mainly includes the following steps: taking a screw with a spiral groove on the outer surface of the screw; taking a first nut group, the first nut group being at least The first nut has a first nut and at least one set of a plurality of first balls. The first nut has a first perforation, the first perforation is for the screw to pass through, and the inner surface of the first perforation has a spiral shape. A first nut groove, the first balls are placed in the first nut groove and the screw groove, the first balls and the inner wall surface of the first nut groove and the screw groove The walls are in contact with each other at a predetermined contact angle. A second nut group is used for backup. The second nut group has at least one second nut and at least one plurality of second balls. The second nut has a second Perforation, the inner surface of the second perforation has a spiral second nut groove, the second balls are placed in the second nut groove, the second balls and the second nut The inner wall surfaces of the groove are in contact with each other at a predetermined contact angle, and the contact angle of the second nut group and the first nut group The contact angles are different; after the first nut group has worn out the first wear track on the screw of the screw, the first nut group is detached from the screw, and the second nut group and the The screw is assembled and used. The second nut group grinds a second wear track on the screw, and the first wear track and the second wear track do not overlap each other. According to the method of using the ball screw set according to item 7 of the scope of the patent application, a third nut set is further used. The third nut set has at least one third nut and at least one plurality of third balls. The third nut has a third perforation. The inner surface of the third perforation has a third nut groove in a spiral shape. The third balls are placed in the third nut groove. Wait until the third ball contacts the inner wall surface of the third nut groove at a predetermined contact angle, and the contact angle of the third nut group is different from the contact angle of the first nut group and the contact angle of the second nut group ; After the second nut group has ground the second wear track on the screw, detach the second nut group from the screw, and replace the third nut group with the screw to use, The third nut group grinds a third wear track on the screw, and the first wear track, the second wear track, and the third wear track do not overlap each other. According to the method of using the ball screw set according to item 7 of the scope of the patent application, the contact angle between the first balls and the inner wall surface of the first nut groove is 40 degrees, and the second balls and the second ball are in contact with each other. The contact angle of the inner wall surface contact of the nut groove is 50 degrees, and the contact angle of the third ball with the inner wall surface of the third nut groove is 60 degrees. According to the method of using the ball screw set according to item 8 of the scope of the patent application, wherein the third nut group has two third nuts connected to each other and a plurality of third ball balls of the third group, The contact angle between the three nuts and one third ball is opposite to the contact angle between the other third nut and another third ball. According to the method of using the ball screw set according to item 7 of the scope of the patent application, wherein the first nut set has two first nuts connected to each other and two sets of plural second balls, one of the first nut sets The contact angle between the first nut and one of the first balls is opposite to the contact angle between the other first nut and the other first ball; the second nut group has two interconnected second Nut and two sets of plural second balls, contact angle between one second nut and one second ball of the second nut group and contact angle between another second nut and another second ball Reverse.