TWI541459B - Ball screw with lubrication device - Google Patents

Description

Ball screw with lubrication device

The invention relates to a ball screw, and in particular to a ball screw having a lubricating device.

Since the ball screw has excellent mechanical transmission efficiency, it has been widely used in various tools that require precise movement. However, if the ball screw lacks proper lubrication under long-term use, it is easy to cause the friction between the nut and the screw shaft to gradually increase and accelerate the wear of the ball screw.

As far as the related prior art is concerned, as disclosed in U.S. Patent No. 6,125,968, the regulating valve is used to control the flow rate of the lubricating oil. However, the setting of the regulating valve is bound to cause problems of complicated structure and increased cost, and the like is also disclosed in the Republic of China. The patent No. 201239217 utilizes the axial movement of the moving element to change the contact area of the guiding element on the lubricating original to achieve the effect of controlling the amount of oil, but in the conventional patent case, the nut must be configured to cooperate with the movement. The length of the component increases, and there is no way to actually interrupt the capillary between the guiding element and the lubricating element, so that oil leakage may occur.

The main object of the present invention is to provide a ball screw which has a simple structure and does not need to increase the length of the nut, and can solve the problem of oil leakage.

In order to achieve the above object, the ball screw of the present invention comprises a screw, a nut, a plurality of balls, and a lubricating device. The screw has an externally threaded groove; the nut can Inserted on the screw along the axial direction of the screw and having an internal thread groove, a radial perforation, and an axial perforation corresponding to the external thread groove of the screw, the radial perforation The outer peripheral surface of the nut extends into communication with the internally threaded groove, the axial through hole extending from one end surface of the nut to communicate with the radial through hole; the plurality of balls are rollably disposed outside the screw thread groove and Between the threaded grooves of the nut; the lubricating device has a fuel tank, a hollow adjusting member, a first oil absorbing material, and a second oil absorbing material, the oil tank is sleeved on the screw and connected to one end of the nut The hollow adjusting member is rotatably disposed in the radial through hole of the nut and has a radial communication hole. The first oil absorbing material is disposed in the oil tank and has a contact portion. The contact portion is disposed on the screw. The second oil absorbing material is disposed in the hollow adjusting member in the axial perforation of the cap.

Thereby, when the hollow adjusting member is in a first position, the radial communication hole of the hollow adjusting member corresponds to the axial perforation of the nut, so that the contact portion of the first oil absorbing material can pass through the hollow adjusting member The radial communication hole is in contact with the second oil absorbing material, and the lubricating oil stored in the oil tank can provide lubrication to the screw by capillary phenomenon. When the hollow adjusting member is in a second position, the hollow adjustment The radial communication hole of the piece and the axial perforation of the nut are mutually offset, so that the contact portion of the first oil absorbing material cannot contact the second oil absorbing material to interrupt the capillary phenomenon between the two, and the lubricating oil at this time will Will be blocked by the hollow adjustment member to solve the problem of oil leakage.

10‧‧‧Rolling screw

20‧‧‧ screw

22‧‧‧External thread groove

30‧‧‧ Nuts

32‧‧‧Threaded groove

34‧‧‧radial perforation

36‧‧‧Axial perforation

40‧‧‧ balls

50‧‧‧Lubrication device

51‧‧‧ fuel tank

52‧‧‧ hollow adjustment parts

53‧‧‧ oil pipe

54‧‧‧radial communication hole

P1‧‧‧ first position

P2‧‧‧ second position

55‧‧‧First oil absorption material

56‧‧‧Second oil absorbing material

57‧‧‧Contacts

Figure 1 is a perspective view of the present invention.

Figure 2 is a partial exploded perspective view of the present invention.

Figure 3 is a partial cross-sectional view of the present invention, mainly showing the state in which the hollow regulating member is in the first position.

Fig. 4 is similar to Fig. 3 and mainly shows the state in which the hollow regulating member is located at the second position.

Referring to Figures 1 and 2, the ball screw 10 of the present invention includes a screw 20, a nut 30, a plurality of balls 40, and a lubricating device 50.

The screw 20 has an externally threaded groove 22, and the nut 30 is sleeved on the screw 20 and has an internally threaded groove 32. The internal thread groove 32 corresponds to the external threaded groove 22 of the screw 20. In addition, the nut 30 has a radial through hole 34. With an axial bore 36, the radial bore 34 extends from the outer peripheral surface of the nut 30 to communicate with the internally threaded groove 32, and the axial bore 36 extends from one end face of the nut 30 to communicate with the radial bore 34.

Each of the balls 40 is rollably disposed between the threaded groove 22 outside the screw 20 and the internally threaded groove 32 of the nut 30.

The lubricating device 50 has a fuel tank 51 and a hollow adjusting member 52. The oil tank 51 is sleeved on the screw 20 and fixed to one end of the nut 30. The oil tank 51 has an oil injection pipe 53 toward one end surface of the nut 30. The oil injection pipe 53 is disposed in the axial through hole 36 of the nut 30, and the hollow adjusting member The radial through hole 34 is rotatably disposed in the radial through hole 34 of the nut 30. When the hollow adjusting member 52 is rotated to a first position P1, the radial communication hole 54 of the hollow adjusting member 52 corresponds to the screw. The axial through hole 36 of the cap 30 is offset between the radial communication hole 54 of the hollow adjusting member 52 and the axial through hole 36 of the nut 30 when the hollow adjusting member 52 is rotated to a second position P2. However, in order to facilitate the operation of the hollow adjusting member 52, the hollow adjusting member 52 is screwed into the radial through hole 34 of the nut 30 in the embodiment, which is a preferred embodiment, that is, the radial direction of the nut 30. The hole wall of the through hole 34 and the outer peripheral surface of the hollow adjusting member 52 are respectively machined with internal and external threads to enable screwing therebetween Together. In addition, the lubricating device 50 has a first oil absorbing material 55 and a second oil absorbing material 56. The first oil absorbing material 55 (here, wool felt is taken as an example) is disposed in the oil tank 51 and has a contact portion 57. The contact portion 57 is worn. The second oil absorbing material 56 (here, a wool felt is exemplified) is inserted into the hollow adjusting member 52 and protruded into the outer thread groove 22 of the screw 20 at one end thereof.

It can be seen from the above structure that when the ball screw 20 of the present invention is to be lubricated, the hollow adjusting member 52 is first rotated by a hand tool (such as a screwdriver) to the first position P1 as shown in Fig. 3, when the hollow adjusting When the member 52 is in the first position P1, the radial communication hole 54 of the hollow adjusting member 52 corresponds to the axial through hole 36 of the nut 30, so that the contact portion 57 of the first oil absorbing material 55 can pass through the radial direction of the hollow adjusting member 52. The communication hole 54 is in contact with the second oil absorbing material 56. At this time, the first oil absorbing material 55 can transfer the lubricating oil stored in the oil tank 51 to the second oil absorbing material 56 by capillary phenomenon, and then the second oil absorbing material 56 will be further The adsorbed lubricating oil is injected into the thread groove 22 outside the screw 20 to achieve a lubricating effect. However, if it is required to reduce the flow rate of the lubricating oil, the user can rotate the hollow adjusting member 52 from the first position P1 toward the second position P2 by a slight angle, but does not rotate to the second position P2, so that the first, The contact area between the second oil absorbing members 55, 56 can be appropriately reduced, thereby achieving the effect of adjusting the amount of oil.

As can be seen from the foregoing, in the present invention, during the rotation of the hollow adjusting member 52 from the first position P1 to the second position, the contact area between the first oil absorbing material 55 and the second oil absorbing material 56 is reduced, thereby reducing the second oil absorbing material 56. The rate at which the first oil absorbing material 55 adsorbs the lubricating oil also reduces the rate at which the lubricating oil is injected into the threaded groove 22 outside the screw 20.

When the lubrication operation is to be ended, the hollow adjusting member 52 is also rotated by the hand tool to the second position P2 as shown in Fig. 4, and when the hollow adjusting member 52 is located at the second position P2, the radial regulating member 52 is radially connected. The holes 54 and the axial through holes 36 of the nut 30 are offset from each other, so that The capillary phenomenon between the first and second oil absorbing materials 55, 56 is interrupted. At this time, in addition to stopping the lubrication of the screw 20, the hollow regulating member 52 simultaneously blocks the first oil absorbing material 55 from the oil tank 51. The oil is absorbed to avoid oil leakage.

In summary, the ball screw 20 of the present invention achieves the effect of adjusting the amount of oil by the rotation of the hollow adjusting member 52 and the capillary phenomenon between the first and second oil absorbing members 55, 56, compared with the conventional technique. The present invention does not need to increase the length of the nut 30 and change the existing structure of the oil tank 51, so that the manufacturing cost can be effectively reduced, and a good sealing property can be provided to completely solve the problem of oil leakage.

30‧‧‧ Nuts

34‧‧‧radial perforation

51‧‧‧ fuel tank

52‧‧‧ hollow adjustment parts

53‧‧‧ oil pipe

54‧‧‧radial communication hole

56‧‧‧Second oil absorbing material

57‧‧‧Contacts

Claims (5)

A ball screw comprising: a screw having an externally threaded groove; a nut slidably disposed along the screw in the axial direction of the screw and having an internally threaded groove, a radial perforation, and an axial direction a perforation, the internal thread groove corresponding to the external thread groove of the screw, the radial perforation extending from the outer circumferential surface of the nut to communicate with the internal thread groove, the axial perforation extending from one end surface of the nut to a plurality of balls are rotatably disposed between the thread groove of the screw and the thread groove of the nut; and a lubricating device having a fuel tank, a hollow adjusting member, and a first oil absorbing material, And a second oil absorbing material, the oil tank is sleeved on the screw and connected to one end of the nut, and the hollow adjusting member is rotatably disposed in a radial direction of the nut between a first position and a second position. The first oil absorbing material is disposed in the oil tank and has a contact portion, the contact portion is disposed in the axial through hole of the nut, and the second oil absorbing material is disposed in the hollow Inside the adjustment member; wherein when the hollow adjustment member is located In a position, the radial communication hole of the hollow adjusting member corresponds to the axial perforation of the nut, so that the contact portion of the first oil absorbing material contacts the second oil absorbing material via the radial communication hole of the hollow adjusting member; The process of reducing the contact area between the first oil absorbing material and the second oil absorbing material during the rotation of the hollow adjusting member from the first position to the second position The ball screw of claim 1, wherein when the hollow adjusting member is located at the second position, the radial communication hole of the hollow adjusting member and the axial through hole of the nut are offset from each other, so that the first oil absorbing material is The contact portion is inaccessible to the second oil absorbing material. The ball screw of claim 1, wherein the hollow adjusting member is screwed into the radial through hole of the nut. The ball screw according to claim 1, wherein the oil tank has an oil injection pipe toward an end surface of the nut, the oil injection pipe is disposed in the axial through hole of the nut, and the contact portion of the first oil absorbing material is disposed. In the fuel pipe of the fuel tank. The ball screw of claim 1, wherein one end of the second oil absorbing material projects into a thread groove outside the screw.