TWI386568B - Ball screw with a self-lebrication device - Google Patents

Description

Ball screw with self-lubricating device

The invention relates to a ball screw, and more particularly to a ball screw having an automatic lubrication device.

At present, the general ball screw is mainly composed of a nut that is screwed through the free-rolling ball and the screw shaft, and the nut is smoothly slipped by the free rolling ball, because of its excellent smoothness and precision. Therefore, it is widely used in various tools that require precise movement, such as various types of micro-machining or semiconductor processing equipment, so the lubrication on the spiral track is very important. However, if the ball screw lacks lubrication for a long time, the friction between the nut and the screw may be increased to accelerate the wear of the ball screw.

In order to reduce the wear of the ball screw due to friction, a ball screw lubrication system as shown in Figs. 1 and 2 is known, wherein: Figure 1 is a U.S. Patent No. US 6364058, which utilizes an absorbent member 11 to adsorb lubricating oil. Filling the oil tank 11 and passing through a conductive member 12 having a different structure but the same material as the absorbing member 10, guiding the lubricating oil to a protrusion 121 on the conductive member 12, and the protrusion 121 is in contact with the screw directly at the screw The lubricating oil is applied to the lubricating oil, and a scraper 13 is disposed on the outer edge of the oil tank. The scraper 13 is composed of a body 131, a scraping ring 132 and a cover 133. Figure 2 is a U.S. Patent No. 6,216,821, in which a polymer 21 adsorbed with lubricating oil is packed in a cover 20, and the cover 20 is fixed to the nut 22, using a The elastic member 23 applies a radial load to the polymer 21 to closely adhere the polymer 21 to the screw 24, whereby the lubricating oil is applied to the surface of the screw to achieve a lubricating effect.

However, the above-mentioned prior art requires that the lubricating oil is adsorbed through a medium such as the above-mentioned absorbent member and polymer, and then the medium is brought into contact with the screw by a different structure, and the lubricating oil is applied to the screw; in actual use, The lubricating oil is adsorbed on a medium, so that the lubricating oil cannot be fully utilized, which indirectly causes the cost of the grease; further, the contact area between the screw and the medium is limited, and it is difficult to completely maintain the lubricating effect in a high-speed environment; although in US 6216821, the screw The contact area with the medium is large, but it is easy to have a high temperature rise phenomenon, and it is not ideal for use; in addition to the above problems, the structure is complicated and the number of components is relatively large, which is relatively difficult to install and disassemble, and the cost is high.

In order to effectively solve the aforementioned related problems, the creators of the present invention have accumulated research and development technology and experience in the field of ball screws in the past, and developed a lubricating oil through a telescopic mechanism provided inside the fuel tank from the perspective of market demand without excessive assembly and maintenance processing. Focus on the circumference of the screw, and then apply the lubricating oil to the screw by external force to achieve the ball screw with easy production and maintenance and good lubrication effect.

The main object of the present invention is to provide a ball screw having a self-lubricating device, wherein the self-lubricating device is formed by a closing member, a connecting sliding member and a pushing sliding member, and is formed by the oil tank. And the screw penetrates the self-lubricating device and the nut, so that the outer peripheral wall of the screw and the self-lubricating device and the inner peripheral wall of the nut cooperate with a sealing member and a thread path of the closing member to form a closed space. In order to seal the grease, and to change the enclosed space, the grease is concentrated around the screw to achieve sufficient lubrication and operation in a high-speed environment.

In addition, the second object of the present invention is to use the external force to apply grease to the surface of the screw to avoid the consumption of the grease due to adsorption on the medium; further, the invention has fewer components, simple device, and easy maintenance. Assembly or disassembly to meet the industry's need to reduce costs.

In order to achieve the above object, a ball screw having a self-lubricating device comprises: a screw having a rolling groove on a surface thereof; a nut passing through the screw and having a rolling groove opposite to the rolling groove; a ball is disposed between the rolling groove and the rolling groove; a sealing member is disposed at one end of the nut; a self-lubricating device is disposed at one end of the nut opposite to the sealing member, and includes: The oil tank is formed by a cavity having an opening, and the opening has a through hole at the bottom of the tank, the tank is provided with grease, and the tank is inserted through the tank and the opening The screw makes the grease contact with the screw; a pushing sliding member has a through hole therein, and the outer wall has a contact surface, the pushing sliding member is accommodated inside the oil tank, and the inner wall of the oil tank receiving groove and the pushing The sliding contact surface is slidably engaged, and the pushing sliding member is disposed in the screw through the through hole; a connecting sliding member has a through hole therein, and the connecting sliding member is received in the pushing sliding member, so that the connecting sliding member is received The peripheral wall of the through hole of the push slider and the connection slide The outer wall is slidably engaged, and the connecting sliding member is disposed in the screw through the through hole; a closing member having a pivot post and a plurality of elastic members annularly arranged around the pivot post, the pivot post having a through hole The closure is hinged to the tank capacity a slot opening, the end of the elastic member is in contact with the end surface of the push slider, the pivot post is received in the through hole of the connecting slider, so that the peripheral wall of the connecting sliding through hole and the outer wall of the pivot post are slidably engaged, and the closing member is The through hole is bored in the screw; if the screw penetrates the self-lubricating device and the nut, the outer peripheral wall of the screw and the inner peripheral wall of the self-lubricating device and the nut are matched with the thread of the sealing member and The seal forms a closed space for sealing the grease.

In order to enable your review committee to have a better understanding and understanding of the purpose, characteristics and efficacy of this creation, please refer to the following [simplified description of the drawings] for details: First, please refer to the third, fourth, fifth, 6 is a ball screw 40 with a self-lubricating device according to an embodiment of the present invention. The ball screw 30 is screwed by a screw 32 through a plurality of balls 34 and a nut 31, and the nut 31 has two ends. A sealing member 33 is disposed at one end, and the self-lubricating device 40 is disposed at the other end, and the screw 32 extends through the nut 31, the sealing member 33 and the self-lubricating device 40, and the self-lubricating device 40 is coupled to the screw 32 When the nut 31 is relatively rotated, the screw 32 is provided for lubrication. The self-lubricating device 40 is composed of a fuel tank 41, a pushing sliding member 42, a connecting sliding member 43, a closing member 44 and a plurality of elastic members 45. The oil tank 41 is a hollow cylindrical structure, and has a cavity 411 formed therein. The bottom of the cavity 411 defines a through opening 412. The opening 412 is formed with a ring protrusion 413. The screw 31 extends through the oil tank 41. a port 412, and through the ring protrusion 413, the oil tank 4 1 is fixedly located on the end surface of the nut 30; the push sliding member 42 is a hollow cylindrical structure having a through hole 421 therein. The outer wall has a contact surface 423, the end surface of the push sliding member 42 has a plurality of annularly arranged grooves 424, and the push sliding member 42 has a plurality of convex portions 422 on the peripheral wall of the through hole 421; The sliding member 42 is received in the interior of the oil tank 41, and the groove 424 and the convex portion 422 are opened toward the receiving groove 411 of the oil tank 41. The inner surface of the oil tank 41 receiving groove 411 is in contact with the pushing sliding member 42. The connecting slider 43 is a hollow thin shell cylindrical structure having a through hole 431 therein, and the outer wall has a plurality of sliding slots 432, the plurality of sliding slots 432 are parallel to the screw 31, and the connecting sliding member The peripheral wall of the through hole 431 has a plurality of convex portions 433; the connecting sliding member 43 is received inside the pushing sliding member 42 so as to have an opening of one end of the convex portion 433 toward the receiving groove 411 of the oil tank 41, and The convex portion 422 of the pushing slider 42 is received in the sliding groove 432 of the connecting sliding member 43, so that the peripheral wall of the through hole 421 of the pushing sliding member 42 and the outer wall of the connecting sliding member 43 are tightly slidingly fitted; 44, the end surface has a pivot post 441 and a plurality of studs 443 annularly arranged on the pivot post 4 The periphery of the through hole 41 is formed by a combination of a plurality of elastic members 45, wherein the elastic member 45 is a spring. The pivot post 441 is a hollow cylindrical structure having a through hole 445, and the through hole 445 is formed with a threaded passage 444. The outer peripheral wall of the pivot post 441 has a plurality of sliding slots 442, and the plurality of sliding slots 442 are parallel to the screw 31; the closing member 44 is capped and locked to the oil tank 41. The opening of the cavity 411 is such that one end of the elastic member 45 is coupled to the boss 443 of the end surface of the closing member 44, and the other end is received by the groove 424 of the pushing slider 42. The pivot post 441 is accommodated in the connection sliding. The inside of the member 43 and the convex portion 433 of the connecting slider 43 are received in the sliding slot 442 of the pivot post 441, so that the connecting slider 43 is inner circumference. The wall and the outer peripheral wall of the pivot post 441 are in a tight sliding fit; if the self-lubricating device 40 is formed by the closing member 44, the connecting sliding member 43 and the pushing sliding member 42 The oil tank 41 is configured, and the screw 32 extends through the self-lubricating device 40 and the nut 31, so that the outer peripheral wall of the screw 32 and the inner wall of the self-lubricating device 40 and the nut 31 cooperate with the thread of the sealing member 44. The 444 and the seal 33 form a closed space 50 for sealingly filling the grease A.

The above is the main components of the embodiment of the present invention and the configuration description thereof. As for the operation mode and the function of the embodiment of the present invention, please refer to the figures 4 and 6 to perform the assembly work of the present invention. The lubricating oil is filled between the oil tank 41 and the screw 32, and then the connecting sliding member 43 and the pushing sliding member 42 are sequentially fitted to the pivot 441 column of the closing member 44, and the elastic member 45 is sandwiched between The end surface of the closing member 44 and the groove 424 of the pushing sliding member 42 are then closed, and the closing member 44 of the plurality of elastic members 45, the pushing sliding member 42 and the connecting sliding member 43 is closed to close the opening of the receiving groove 411 of the oil tank 41. The pivot post 441, the connecting slider 43, the push slider 42 and the plurality of elastic members 45 are housed in the oil tank 41; then the previously filled grease A presses the push slider 42 to push the slider 42 The elastic member 45 is moved in the direction of the closing member 44, so that the force applied by the elastic member 45 to the pushing slider 42 and the force applied by the grease A to the pushing slider 42 are balanced, and the grease A is also stressed. Pushing and adhering to the surface of the screw 32 produces a lubricating effect.

Referring to the figures 4, 7, and 8, the assembled self-lubricating device 40 is coupled to the end surface of the nut 31 through the ring protrusion 413 of the oil tank 41 to make the outer circumference of the screw 32. The wall and the self-lubricating device 40 and the inner peripheral wall of the nut 31 cooperate with the sealing member 33 and the thread passage 444 of the closing member 44 to form a closed space 50 for storing the grease A. When the ball screw 30 is operated for a period of time, the grease A leaks out of the sealed space 50, the balance of the elastic member 45 and the grease A is changed, so that the elastic member 45 is elongated and pushes the push slider 42, thereby compressing the closed space. With a volume of 50, the grease A is pressed to the surface of the screw 32 to continuously produce a good lubricating effect. In addition, when the ball screw 30 is regularly maintained, since the pivot member 441 of the closing member 44, the connecting slider 43, and the pushing slider 42 are closely fitted to each other, the entire telescopic structure can be easily opened by simply unscrewing the closing member 44. Take out and fill the grease A between the oil tank 40 and the screw 32.

"Knowledge"

10‧‧‧ fuel tank

11‧‧‧Absorbers

12‧‧‧Transmission

121‧‧‧ protrusion

13‧‧‧Scratch

131‧‧‧ body

132‧‧‧Scratch ring

133‧‧‧ Cover

20‧‧‧ Cover

21‧‧‧ polymer

22‧‧‧ Nuts

23‧‧‧Flexible parts

24‧‧‧ screw

"this invention"

30‧‧‧Ball screw

31‧‧‧ Nuts

32‧‧‧ screw

33‧‧‧Seal

40‧‧‧Self-lubricating device

41‧‧‧ fuel tank

411‧‧‧ 容容

412‧‧‧ mouth

413‧‧‧ ring convex

42‧‧‧Pushing slides

421‧‧‧through hole

422‧‧‧ convex

423‧‧‧Contact surface

424‧‧‧ Groove

43‧‧‧Connecting slides

431‧‧‧through hole

432‧‧ ‧ chute

433‧‧‧ convex

44‧‧‧Closed

441‧‧‧ pivot

442‧‧‧ chute

443‧‧‧Bump

444‧‧‧Threaded Road

445‧‧‧through hole

45‧‧‧Flexible components

50‧‧‧closed space

A‧‧‧ Grease

Figure 1 is a perspective exploded view of U.S. Patent No. 6,364,058.

Figure 2 is a schematic cross-sectional view of U.S. Patent No. 6,216,821.

Fig. 3 is a perspective exploded view of the present invention.

Fig. 4 is a schematic exploded view of the self-lubricating oil tank and the nut of the present invention.

Figure 5 is a schematic view of a three-dimensional assembly of the present invention.

Fig. 6 is a schematic cross-sectional view showing the state in which the self-lubricating oil tank of the present invention is filled with grease.

Figure 7 is a schematic cross-sectional view showing the push-squeeze grease of the present invention.

Fig. 8 is a schematic cross-sectional view showing the state in which the grease is depleted in the self-lubricating oil tank of the present invention.

30‧‧‧Ball screw

31‧‧‧ Nuts

32‧‧‧ screw

33‧‧‧Seal

40‧‧‧Self-lubricating device

41‧‧‧ fuel tank

411‧‧‧ 容容

412‧‧‧ mouth

42‧‧‧Pushing slides

421‧‧‧through hole

422‧‧‧ convex

423‧‧‧Contact surface

424‧‧‧ Groove

43‧‧‧Connecting slides

431‧‧‧through hole

432‧‧ ‧ chute

433‧‧‧ convex

44‧‧‧Closed

441‧‧‧ pivot

442‧‧‧ chute

443‧‧‧Bump

444‧‧‧Threaded Road

445‧‧‧through hole

45‧‧‧Flexible components

Claims (6)

A ball screw with a self-lubricating device comprises: a screw having a rolling groove on an outer wall thereof; a nut passing through the screw and having a rolling groove opposite to the rolling groove; a plurality of balls Between the rolling groove and the rolling groove; a sealing member is disposed at one end of the nut; a self-lubricating device is disposed at one end of the nut opposite to the sealing member, and comprises: a fuel tank for internal forming The container has an opening, and a groove is formed in the bottom of the container, and the container is provided with grease, and the oil tank is disposed on the screw through the container and the opening for lubrication The grease is in contact with the screw; a pushing sliding member has a through hole therein, and the outer wall has a contact surface, and one end surface has a plurality of annularly arranged grooves, and the pushing sliding member is accommodated inside the oil tank, the fuel tank The inner wall of the cavity is slidably engaged with the contact surface of the pushing sliding member, and the pushing sliding member is disposed through the through hole through the screw; a connecting sliding member has a through hole therein, and the connecting sliding member is received therein Pushing the inside of the slider to make the push slider pass Peripheral wall and the outer wall of the connecting slide sliding fit, and the connecting line through the slide member in the through hole provided in the screw; a closure member, having a pivot post end surface, a plurality of rings disposed around the pivot post a protruding post and a plurality of elastic members, the pivot post has a through hole; the closing member is hingedly locked to the opening of the oil tank, the elastic member is sleeved at the one end and the other end is disposed at the push sliding In the groove of the end face, the pivot post is received in the through hole of the connecting sliding piece, so that the peripheral wall of the connecting sliding through hole and the outer wall of the pivoting column are slidably engaged, and the closing member is penetrated by the through hole If the screw penetrates the self-lubricating device and the nut, the outer peripheral wall of the screw and the inner peripheral wall of the nut and the inner wall of the nut cooperate with the thread of the sealing member and the sealing member to form a closed space for Fill the grease with a seal. The ball screw with a self-lubricating device according to claim 1, wherein the oil tank port is formed with a ring protrusion, the screw penetrating the port and passing through the ring protrusion to fix the tank lock Nut end face. The ball screw with a self-lubricating device according to claim 1, wherein the peripheral wall of the push-sliding through hole has a plurality of convex portions. The ball screw with a self-lubricating device according to claim 3, wherein the outer wall of the connecting sliding member has a plurality of sliding grooves, and the peripheral wall of the through hole has a plurality of convex portions, so that the convex portion of the pushing sliding member The sliding groove of the connecting sliding member is arranged such that the peripheral wall of the through hole of the pushing sliding member and the outer wall of the connecting sliding member are in a tight sliding fit. The ball screw with a self-lubricating device according to claim 4, wherein the outer wall of the closing member has a plurality of sliding grooves, the pivoting column is received in the connecting sliding hole, and the connecting sliding member is convex. The portion is placed in the chute of the pivot post such that the peripheral wall of the connecting sliding through hole and the outer wall of the pivot post are in a tight sliding fit. The ball screw with a self-lubricating device according to claim 1, wherein the pivot column has a hollow cylindrical structure, and the inner peripheral wall is formed with a threaded passage for screwing with the screw to block the grease. leak.