External circulation ball screw

Abstract

The utility model relates to the technical field of lead screws, and discloses an external circulation ball screw which comprises a main shaft and an outer sleeve detachably installed on the wall face of the main shaft. The limiting structure is arranged between the outer sleeve and the main shaft and used for installing the outer sleeve, the limiting structure comprises an inserting groove and a convex rib, the main shaft is provided with the inserting groove, and the convex rib is fixedly connected with the outer sleeve and inserted into the inserting groove; the locking structure comprises an external thread sleeve and a locking nut, the external thread sleeve is fixedly connected with the main shaft, the locking nut is in threaded connection with the external thread sleeve, the detachable outer sleeve is arranged, the convex ribs are aligned with the inserting grooves and inserted into the inserting grooves, the outer sleeve is installed, the length of the inserting grooves can be smaller than that of the main shaft, and therefore the outer sleeve can be installed conveniently. When the threads outside the outer sleeve are damaged, the outer sleeve can be independently replaced, loss and maintenance cost are reduced, secondly, the whole lead screw can form a bidirectional lead screw or a unidirectional lead screw by disassembling and assembling the outer sleeves with different threads, and better use flexibility is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of screw rod especially relates to a ball screw rod of external circulation. BACKGROUND

[0002] Ball screw transmission refers to the continuous filling of balls as an intermediate body between the screw rod and the nut with spiral grooves, which changes the sliding friction between the screw rod and the nut into rolling friction.

[0003] The prior art discloses a ball screw rod of external circulation (publication number: CN119163733A), which comprises a screw rod, a threaded groove, a dustproof sealing disc, an external nut shell, a circulating pipe, a ball control box, a top seat, a channel interception assembly, a ball limiting assembly, a horizontal moving ring, a circulating connecting pipe and light balls.

[0004] The screw rod in the prior art is integrally formed, and the threaded part of the screw rod will be worn out with use, affecting the stability of transmission, so the whole needs to be replaced, and the part that is actually damaged is the thread, so the whole replacement will cause large loss and high maintenance cost, and a screw rod can only have one type of thread, so the flexibility of use is limited.

[0005] Therefore, we propose a ball screw rod of external circulation. CONTENT OF THE UTILITY MODEL

[0006] The utility model mainly solves the technical problem of large loss of whole replacement after the above-mentioned screw rod is damaged, and provides a ball screw rod of external circulation.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme, a ball screw rod of external circulation, comprising:

[0008] A main shaft and an outer sleeve detachably installed on the wall surface of the main shaft, the outer sleeve is threadedly connected with a nut seat;

[0009] A limiting structure is arranged between the outer sleeve and the main shaft for installing the outer sleeve, the limiting structure comprises a slot and a protruding rib, the main shaft is provided with the slot, and the protruding rib is fixedly connected with the outer sleeve and is inserted into the slot;

[0010] The locking structure is arranged at the end of the main shaft and used for limiting the sleeve, and comprises an external thread sleeve and a locking nut, the external thread sleeve is fixedly connected with the main shaft, the locking nut is threadedly connected with the external thread sleeve, and the end of the locking nut abuts against the end of the sleeve and limits the sleeve in the radial direction.

[0011] As a preferred mode of the utility model, the convex rib forms a rectangular column, and the sleeve is a circular tube structure, and the inner circumferential surface of the sleeve is provided with two integrally formed convex ribs.

[0012] As a preferred mode of the utility model, the main shaft is a cylinder, and two insertion grooves are formed in the circumferential surface of the main shaft, and the insertion grooves form rectangular slots matched with the convex ribs.

[0013] As a preferred mode of the utility model, the locking structure further comprises a convex block, a thrust block and a thrust groove, the convex block is fixedly connected with the external thread sleeve, the thrust block is elastically connected with the convex block, a plurality of thrust grooves are formed in the end of the locking nut, and the thrust block is clamped with the thrust grooves.

[0014] As a preferred mode of the utility model, the convex block is fixedly installed on the inner circumferential surface of the external thread sleeve, the thrust block is provided with integrally formed teeth close to the end face of the locking nut, the teeth are matched with the thrust grooves, and a plurality of same thrust grooves are annularly arranged in the end of the locking nut.

[0015] As a preferred mode of the utility model, the locking structure further comprises a sliding channel, a sliding block and a connecting shaft, the end of the convex block is provided with the sliding channel, the sliding block is fixedly connected with the thrust block, the connecting shaft is fixedly connected with the sliding block, and the sliding block and the connecting shaft are located in the sliding channel.

[0016] As a preferred mode of the utility model, the sliding channel comprises a front section and a rear section, the front section of the sliding channel is a rectangular slot, the rear section of the sliding channel is a circular hole, and the front section and the rear section are communicated.

[0017] As a preferred mode of the utility model, the sliding block is a rectangular block, the connecting shaft is a cylinder, a tension spring is fixedly connected with the end of the connecting shaft, the tension spring is fixedly connected with the convex block, the sliding block is matched with and located in the front section of the sliding channel, and the connecting shaft is matched with and located in the rear section of the sliding channel.

[0018] Beneficial effects

[0019] The utility model provides a kind of outer circulation ball screw.There is following beneficial effect:

[0020] 1. The outer circulation ball screw, by setting the detachable sleeve, by aligning the ribs with the slot and inserting, realize the installation of the sleeve, and the length of the slot can be less than the length of the main shaft, when the thread on the outside of the sleeve is damaged, the sleeve can be replaced alone, reduce the loss and maintenance cost, secondly, by disassembling the sleeve with different threads, the whole screw rod forms a bidirectional screw rod or a unidirectional screw rod, which has better use flexibility.

[0021] 2. The outer circulation ball screw, by threadedly connecting the locking nut with the outer screw sleeve, the end of the outer screw sleeve abuts against the end of the sleeve and the ribs, and the ribs located in the slot can provide circumferential limiting for the sleeve, inhibit the sleeve from slipping with the main shaft, and cooperate with the locking nut to provide radial limiting for the end of the limiting rib, on the basis of being capable of conveniently disassembling the sleeve, the stability and transmission effect after the sleeve is installed are ensured.

[0022] 3. The outer circulation ball screw, by setting the elastically connected thrust block, after the locking nut is fastened, the thrust block is close to the end of the locking nut, the teeth of the thrust block are clamped into the thrust groove to limit the locking nut, and then the locking nut cannot rotate after being fastened, and the limiting effect and stability of the sleeve are further improved.

[0023] 4. The outer circulation ball screw, by pulling the thrust block, the thrust block drives the slider and the connecting shaft to displace synchronously, when the slider is separated from the front section of the sliding channel, the connecting shaft is located in the rear section of the sliding channel, the thrust block is rotated towards the center of the outer screw sleeve, and then the locking nut cannot interfere with the fastening, after the locking nut is fastened, the above steps are repeated, the thrust block is rotated to one side of the locking nut, and then the thrust block is loosened, the thrust block is reset under the pulling action of the tension spring, the slider can inhibit the rotation of the thrust block, and then the thrust block can limit the locking nut, and the locking nut cannot interfere with the fastening and can be limited. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall perspective view of the utility model;

[0025] Figure 2 It is the main shaft perspective view of the utility model;

[0026] Figure 3 It is the sleeve perspective view of the utility model;

[0027] Figure 4 It is the locking nut and outer screw sleeve installation schematic view of the utility model;

[0028] Figure 5 It is the locking nut and outer screw sleeve assembly drawing of the utility model;

[0029] Figure 6This is a 3D model of the convex blocks;

[0030] Figure 7 This is a 3D view of the push block, slider, and connecting shaft.

[0031] Legend: 10. Spindle; 11. Outer sleeve; 12. Nut seat; 13. Slot; 14. Rib; 20. External threaded sleeve; 21. Locking nut; 30. Protrusion; 31. Thrust block; 32. Thrust groove; 33. Sliding channel; 34. Slider; 35. Connecting shaft. Detailed Implementation

[0032] An external circulation ball screw, such as Figure 1 As shown, it includes:

[0033] The spindle 10 and the outer sleeve 11 are detachably mounted on the wall of the spindle 10. The outer sleeve 11 is threadedly connected to the nut seat 12.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, a limiting structure is set between the outer sleeve 11 and the main spindle 10 for installing the outer sleeve 11. The limiting structure includes a slot 13 and a rib 14. The main spindle 10 has a slot 13, and the rib 14 is fixedly connected to the outer sleeve 11. The rib 14 is inserted into the slot 13 and forms a rectangular column. The outer sleeve 11 is a cylindrical structure. The inner circumferential surface of the outer sleeve 11 is provided with two integrally formed ribs 14. The main spindle 10 is a cylinder. The circumferential surface of the main spindle 10 has two slots 13. The slots 13 form rectangular grooves that fit the ribs 14.

[0035] The outer circumferential surface of the outer sleeve 11 is provided with a threaded groove. The thread can be two helical directions with different directions or a single threaded groove. By setting a detachable outer sleeve 11, the outer sleeve 11 can be installed by aligning the rib 14 with the slot 13 and inserting it. The length of the slot 13 can be less than the length of the spindle 10. When the thread on the outer sleeve 11 is damaged, the outer sleeve 11 can be replaced separately to reduce wear and maintenance costs. Furthermore, by disassembling and assembling outer sleeves 11 with different threads, the entire lead screw can be made into a bidirectional lead screw or a unidirectional lead screw, which has better flexibility of use.

[0036] like Figure 1 and Figure 5 As shown, a locking structure is provided at the end of the main shaft 10 to limit the outer sleeve 11. The locking structure includes an external threaded sleeve 20 and a locking nut 21. The external threaded sleeve 20 is fixedly connected to the main shaft 10, and the locking nut 21 is threadedly connected to the external threaded sleeve 20. The end of the locking nut 21 abuts against the end of the outer sleeve 11 and radially limits the outer sleeve 11.

[0037] In the scheme, by threadedly connecting the locking nut 21 with the external thread sleeve 20, the end of the external thread sleeve 20 abuts against the end of the outer sleeve 11 and the convex rib 14, and the convex rib 14 located in the insertion slot 13 can provide circumferential limiting for the outer sleeve 11, inhibit the outer sleeve 11 from slipping with the main shaft 10, and cooperate with the locking nut 21 to provide radial limiting for the end of the convex rib 14, on the basis of conveniently disassembling the outer sleeve 11, guarantee the stability and transmission effect after the outer sleeve 11 is installed.

[0038] As shown in Figure 4 and Figure 5 , the locking structure further comprises a convex block 30, a thrust block 31 and a thrust groove 32, the convex block 30 is fixedly connected with the external thread sleeve 20, the thrust block 31 is elastically connected with the convex block 30, the end of the locking nut 21 is provided with a plurality of thrust grooves 32, the thrust block 31 is clamped with the thrust groove 32, the convex block 30 is fixedly installed on the inner circumferential surface of the external thread sleeve 20, the thrust block 31 is provided with an integrally formed tooth close to the end face of the locking nut 21, the tooth is matched with the thrust groove 32, and the end of the locking nut 21 is annularly arranged with a plurality of same thrust grooves 32;

[0039] In the scheme, as a supplementary description of the above scheme, in order to inhibit the locking nut 21 from loosening to guarantee the limiting effect of the locking nut 21 on the outer sleeve 11, by setting the elastically connected thrust block 31, after the locking nut 21 is fastened, the thrust block 31 is close to the end of the locking nut 21, the tooth of the thrust block 31 is clamped into the thrust groove 32 to limit the locking nut 21, and then the locking nut 21 cannot rotate after being fastened, further improving the limiting effect and stability of the limiting of the outer sleeve 11.

[0040] As shown in Figure 6 and Figure 7 , the locking structure further comprises a sliding channel 33, a sliding block 34 and a connecting shaft 35, the end of the convex block 30 is provided with the sliding channel 33, the sliding block 34 is fixedly connected with the thrust block 31, the connecting shaft 35 is fixedly connected with the sliding block 34, the sliding block 34 and the connecting shaft 35 are located in the sliding channel 33, the sliding channel 33 comprises a front section and a rear section, the front section of the sliding channel 33 is a rectangular groove, the rear section of the sliding channel 33 is a circular hole, the front section and the rear section are communicated, the sliding block 34 is a rectangular block, the connecting shaft 35 is a circular column, the end of the connecting shaft 35 is fixedly connected with a tension spring, the tension spring is fixedly connected with the convex block 30, the sliding block 34 is matched with and located in the front section of the sliding channel 33, and the connecting shaft 35 is matched with and located in the rear section of the sliding channel 33;

[0041] In the scheme, in order to wall in fastening lock nut 21, thrust block 31 affects the rotation of lock nut 21, by pulling thrust block 31, thrust block 31 drives slider 34 and connecting shaft 35 to displace synchronously, when slider 34 is separated from the front section of sliding channel 33, at this time, connecting shaft 35 is located in the rear section of sliding channel 33, by rotating thrust block 31 to make thrust block 31 towards the center direction of outer thread sleeve 20, so as not to interfere with the rotation of lock nut 21, after the fastening of lock nut 21, repeat the above steps, make thrust block 31 rotate to one side of lock nut 21 and then release thrust block 31, thrust block 31 resets under the pulling action of tension spring, slider 34 can inhibit the rotation of thrust block 31, and then thrust block 31 can limit lock nut 21, which neither interferes with the fastening of lock nut 21 nor provides limiting for lock nut 21.

[0042] The working principle of the utility model is: by the convex rib 14 is aligned with the slot 13 and is inserted, the installation of the outer sleeve 11 is realized, by pulling the thrust block 31, the thrust block 31 drives the slider 34 and the connecting shaft 35 to displace synchronously, when the slider 34 is separated from the front section of sliding channel 33, at this time, the connecting shaft 35 is located in the rear section of sliding channel 33, by rotating the thrust block 31 to make the thrust block 31 towards the center direction of outer thread sleeve 20, the lock nut 21 is screwed with the outer thread sleeve 20, the end of the outer thread sleeve 20 abuts against the outer sleeve 11 and the end of the convex rib 14, and the convex rib 14 is located in the slot 13 and can provide the limiting in the circumferential direction for the outer sleeve 11, the sliding of the outer sleeve 11 with the main shaft 10 is inhibited, the end of the convex rib 14 is limited by the lock nut 21 and provides the radial limiting, repeat the above steps, make the thrust block 31 rotate to one side of the lock nut 21 and then release the thrust block 31, the thrust block 31 resets under the pulling action of tension spring, the slider 34 can inhibit the rotation of the thrust block 31, and then the thrust block 31 can limit the lock nut 21, the teeth of the thrust block 31 are clamped into the thrust groove 32 and limit the lock nut 21, and then the lock nut 21 cannot rotate after being fastened, preventing the lock nut 21 from loosening.

[0043] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An external circulation ball screw, characterized by, The utility model relates to a main shaft (10) and detachable installation outer cover (11) of main shaft (10) wall surface, outer cover (11) is screwed with the nut seat (12) of screwing, Limiting structure is arranged between outer cover (11) and main shaft (10) for installing outer cover (11), the limiting structure includes slot (13) and convex rib (14), the main shaft (10) is set up slot (13), the convex rib (14) is fixedly connected with outer cover (11), and the convex rib (14) is inserted with slot (13), Locking structure is arranged at the end of main shaft (10) for limiting outer cover (11), the locking structure includes external thread sleeve (20) and locking nut (21), the external thread sleeve (20) is fixedly connected with main shaft (10), the locking nut (21) is threadedly connected with external thread sleeve (20), and the end of locking nut (21) abuts against the end of outer cover (11) and limits the radial direction of outer cover (11). The convex rib (14) forms a rectangular column, the outer cover (11) is a circular tube structure, and the inner circumferential surface of the outer cover (11) is provided with two integrally formed convex ribs (14).

2. The external circulation ball screw according to claim 1, wherein: The main shaft (10) is a cylinder, and the circumferential surface of the main shaft (10) is provided with two slots (13) forming a rectangular slot matched with the convex rib (14).

3. The external circulation ball screw according to claim 1, wherein: The locking structure further includes a protrusion (30), a thrust block (31), and a thrust groove (32), the protrusion (30) is fixedly connected with the external thread sleeve (20), the thrust block (31) is elastically connected with the protrusion (30), the end of the locking nut (21) is provided with a plurality of thrust grooves (32), and the thrust block (31) is clamped with the thrust groove (32).

4. The external circulation ball screw according to claim 1, wherein: The protrusion (30) is fixedly installed on the inner circumferential surface of the external thread sleeve (20), the thrust block (31) is provided with integrally formed teeth near the end surface of the locking nut (21), the teeth are matched with the thrust groove (32), and the end of the locking nut (21) is annularly arranged with a plurality of same thrust grooves (32).

5. The external circulation ball screw according to claim 4, wherein: The locking structure further includes a sliding channel (33), a sliding block (34), and a connecting shaft (35), the end of the protrusion (30) is provided with the sliding channel (33), the sliding block (34) is fixedly connected with the thrust block (31), the connecting shaft (35) is fixedly connected with the sliding block (34), and the sliding block (34) and the connecting shaft (35) are located in the sliding channel (33).

6. The external circulation ball screw according to claim 4, wherein: The sliding channel (33) includes a front section and a rear section, the front section of the sliding channel (33) is a rectangular slot, the rear section of the sliding channel (33) is a circular hole, and the front section and the rear section are communicated.

7. The external circulation ball screw according to claim 6, wherein: The sliding block (34) is a rectangular block, the connecting shaft (35) is a cylinder, the end of the connecting shaft (35) is fixedly connected with a tension spring, the tension spring is fixedly connected with the protrusion (30), the sliding block (34) is matched with and located in the front section of the sliding channel (33), and the connecting shaft (35) is matched with and located in the rear section of the sliding channel (33).

8. The external circulation ball screw according to claim 6, wherein: ​

Images