TWI714396B - External recirculation type ball screw with reflow pipe structure - Google Patents

Abstract

An external recirculation type ball screw with reflow pipe structure is disclosed. A screw has a plurality of spiral grooves; a nut is sleeved on the screw, and a reflow channel is provided on one side of the nut. A reflow pipe combined with the reflow channel includes a lower shell and an upper shell. The lower shell comprises two half seats which are relatively engaged, and each half seat includes a lower positioning block, a lower curved section and an external pipe. The lower positioning block has a through hole, and the lower curved section with a lower reflow groove. The external pipe has an outer tube, and the two half seats are docked via the external pipe to form an external reflow channel. The upper shell is an integral injection-molded plastic shell seat and correspondingly combined with the lower shell to seal the outer reflow channel.

Description

Outer circulation ball screw with return pipe structure

The invention relates to a ball screw, in particular to a structure of an external circulation ball screw.

The traditional external circulation ball screw is a combination of screw, nut, ball and return tube. The setting method is to set the nut on the screw, and install the return tube outside the nut, and finally set the ball In the screw and the nut; thereby, the ball will enter the elbow from the spiral groove of the screw, and then return to the spiral groove through the return pipe to make a limited circulation movement.

Moreover, the return pipe of the conventional external circulation ball screw is mostly made of plastic integral injection molding or composed of upper and lower half return housings, and the two ends of the return pipe are formed by the rod shaft and the nut. The load paths are connected to form a circulation path. However, the existing return pipe structure is usually elongated and irregular, and it is not easy to align with the nut during installation, which makes it difficult to assemble and disassemble and needs to be improved.

In view of this, the inventor of the present invention focused on the above-mentioned prior art, and made great efforts to solve the above-mentioned problems, which became the research motivation of the present inventor.

One objective of the present invention is to provide an outer circulating ball screw with a return pipe structure Rod, so that the return pipe structure of the outer circulation ball screw achieves the purpose of easy assembly and disassembly.

In order to achieve the above objective, the present invention is an outer circulation ball screw with a return pipe structure, including a screw, a nut and a return pipe structure. The screw has a plurality of spiral grooves; the nut is sleeved on the screw, and one side of the screw cap is provided with a return channel communicating with the spiral groove; the return pipe structure is combined with the return channel and includes a lower shell and an upper shell. The lower shell includes two half-shells that are relatively joined. Each half-shell includes a lower positioning block arranged in the return channel, a lower bending section extending from the lower positioning block, and an external pipe connecting the lower bending section. The lower positioning block has a communication The perforation of the spiral groove, the lower bending section has a lower return groove communicating with the perforation, the outer pipe has an outer pipe connecting the lower return groove, and the two half shells are connected through the outer pipe to form an outer return channel; the upper shell is integrated In a plastic shell seat formed by injection molding, the upper shell correspondingly covers the lower shell and covers the outer return channel.

Compared with the prior art, the return pipe structure of the recirculating ball screw of the present invention includes a lower shell and an upper shell. The lower shell includes two half shells that are oppositely joined, and the upper shell is an integral injection molded plastic shell. Also, the two half shells can be individually assembled into the return channel of the nut, and then the upper shell is correspondingly covered with the lower shell, so that the return pipe structure can be assembled and disassembled without interference with the nut Therefore, the problem of difficult alignment during installation of the conventional return pipe structure can be improved, and the practicability of the present invention can be increased.

1: Outer circulation ball screw

2: steel ball

10: Screw

11: Spiral groove

12: Axle

20: Nut

21: Return channel

210: The first screw hole

22: Through hole

23: rolling groove

30, 30a: Return pipe structure

40, 40a: lower shell

400: External return channel

400a: Lower and outer return channel

41, 41a: half shell seat

410, 410a: perforation

411, 411a: Lower positioning block

4111: Lower docking plane

412, 412a: lower bending section

4120, 4120a: Lower return groove

4121: bump

413: external pipe

413a: Lower external pipe

4130: Outer tube

4130a: Lower outer tube

50, 50a: upper shell

500a: upper and outer return channel

501: Plane

51: The first upper positioning block

511: First upper docking plane

52: The first upper bending section

520: first groove

521: The first upper return groove

53: outer container

54: The second upper bending section

540: second groove

541: The second upper return groove

55: The second upper positioning block

551: The second upper docking plane

56: second screw hole

57: Screw

FIG. 1 is a three-dimensional exploded schematic diagram of the outer circulation ball screw with the return pipe structure of the present invention.

Figure 2 is a three-dimensional exploded schematic view of the return pipe structure of the present invention.

Figure 3 is a schematic diagram of the assembly of the return pipe structure of the present invention.

Figure 4 is a perspective view of a recirculating ball screw outside the present invention.

Figure 5 is a side perspective view of the recirculating ball screw outside the present invention.

Fig. 6 is a sectional view taken along line 6-6 in Fig. 5;

Figure 7 is a top view of the recirculating ball screw outside the present invention.

Figure 8 is a cross-sectional view taken along line 8-8 in Figure 7;

FIG. 9 is a three-dimensional exploded schematic view of the second embodiment of the return pipe structure of the present invention.

FIG. 10 is a schematic view of the assembly of the second embodiment of the return pipe structure of the present invention.

FIG. 11 is a perspective view of the combined second embodiment of the return pipe structure of the present invention.

The detailed description and technical content of the present invention are described as follows in conjunction with the drawings. However, the drawings are only provided for reference and explanation, and are not intended to limit the present invention.

Please refer to FIGS. 1 to 4, which are respectively a three-dimensional exploded schematic view of the outer circulation ball screw with a return pipe structure, a three-dimensional exploded schematic view of the return pipe structure and an assembly schematic view, and a three-dimensional perspective view of the outer circulating ball screw of the present invention. The present invention is an outer circulation ball screw 1 with a return pipe structure, which includes a screw 10, a nut 20 and a return pipe structure 30. The nut 20 is combined with the screw 10, and the return pipe structure 30 is combined on the nut 20 to form an outer circulating ball screw 1 with a return pipe structure. The structure of the outer circulation ball screw 1 is described in more detail as follows.

As shown in FIG. 1, the screw 10 has a plurality of spiral grooves 11; specifically, the screw 10 includes a shaft 12, and the spiral grooves 11 are formed on the outer edge surface of the shaft 12.

The nut 20 is sleeved on the screw 10, and a side surface of the nut 20 is provided with a backflow channel 21 communicating with the spiral grooves 11. In more detail, the nut 20 has a through hole 22 through which the screw 10 can pass, and the inner edge of the through hole 22 faces the spiral grooves 11 and is formed with a plurality of rolling grooves 23.

Furthermore, the return pipe structure 30 is combined with the return passage 21 of the nut 20, and includes a lower housing 40 and an upper housing 50; in addition, the lower housing 40 includes two half-shells 41 that are oppositely joined. In actual assembly, the two half shells 41 of the lower shell 40 are individually assembled into the return channel 21, and then the upper shell 50 is correspondingly covered with the lower shell 40.

As shown in FIGS. 2 and 3, each half-shell 41 includes a lower positioning block 411 arranged in the return channel 21, a lower bending section 412 extending from the lower positioning block 411, and a lower bending section 412 connected to External pipe 413. The lower positioning block 411 has a through hole 410 communicating with the spiral grooves 11; the lower curved section 412 has a lower return groove 4120 communicating with the through hole 410; the external pipe 413 has an outer hole communicating with the lower return groove 4120 Tube 4130. The two half shells 41 are connected through the two external pipes 4130 to form an external return channel 400.

In this embodiment, the side of the external tube 413 far away from the outer tube 4130 is a flat surface, which is not limited in actual implementation.

Furthermore, the upper shell base 50 is an integral injection-molded plastic shell base, including a first upper positioning block 51, a first upper bending section 52 extending from the first upper positioning block 51, and connecting the first upper An outer groove 53 of the curved section 52, a second upper curved section 54 extending from the outer groove 53, and a second upper positioning block 55 connected to the second upper curved section 54. The first upper positioning block 51 and the second upper positioning block 55 respectively correspondingly engage the lower positioning block 411 of the two-half housing 41. In addition, the outer cavity 53 contains the outer tube 4130 of the two-half housing 41 .

In an embodiment of the present invention, the first upper positioning block 51, the second upper positioning block 55 and the two lower positioning blocks 411 are each a ladder block. Preferably, the two lower positioning blocks 411 respectively have a lower mating plane 4111. In addition, the first upper positioning block 51 has a first upper docking plane 511, and the first The second upper positioning block 55 has a second upper butting plane 551. Furthermore, the first upper mating plane 511 and the second upper mating plane 551 are attached to the lower mating plane 4111 of the two lower positioning blocks 411 respectively.

In more detail, one side surface of the lower curved section 412 of the two-half housing 41 has a plurality of protrusions 4121 respectively. In addition, a side surface of the first upper curved section 52 has a plurality of first grooves 520, and a side surface of the second upper curved section 54 has a plurality of second grooves 540. The distance between the lower curved section 412 of the second half shell seat 41 and the first upper curved section 52 and the second upper curved section 54 passes through the protrusions 4121 and the first grooves 520 and the second grooves 540 Positioning by buckling each other.

Furthermore, the first upper curved section 52 has a first upper recirculation groove 521, and the second upper curved section 54 has a second upper recirculation groove 541. The first upper recirculation groove 521 and the second upper recirculation groove 41 respectively correspond to the lower recirculation grooves 4120 of the two lower curved sections 412.

1 and 4 at the same time, in this embodiment, the nut 20 is provided with a plurality of first screw holes 210 on the periphery of the return channel 21; in addition, the upper housing 50 corresponds to the first screw holes 210 provided There are a plurality of second screw holes 56. The upper housing 50 is fixed to the nut 20 by penetrating the second screw holes 56 and the first screw holes 210 through a plurality of screws 57. Accordingly, the upper casing 50 covers the lower casing 40 correspondingly to cover the outer return channel 400.

It should be noted that the outer circulation ball screw 1 is filled with a plurality of steel balls 2, and the outer return passage 400 is formed by the lower return groove 4120 of the second half housing 41 and the outer tube 4130, and the first The upper recirculation trench 521 and the second upper recirculation trench 541 are formed.

Another thing to note is that the outer circulation ball screw 1 is filled with a plurality of steel balls 2, and the steel balls 2 move in the screw 10 along the spiral grooves 11. It is worth noting that the steel balls 2 will move in and out of the return pipe structure 30 along the spiral groove 11 and make a cyclic movement accordingly.

Please continue to refer to FIGS. 5 to 8, which are respectively a side perspective view and a cross-sectional view from one side, an upper view and a cross-sectional view from the other side of the recirculating ball screw outside the present invention. As shown in FIG. 5, in this embodiment, the upper casing 50 is a flat surface 501 on a side away from the nut 20. Also, please refer to FIG. 6, in this embodiment, when the steel balls 2 enter the rolling groove 23 of the nut 20 along the spiral groove 11, and continue to advance to the lower positioning block 411 and the corresponding first upper When the position of the positioning block 51 is located, the steel balls 2 will enter the return pipe structure 30 from the lower positioning block 411 connected to the through hole 410 of the spiral groove 11.

Please also refer to FIGS. 7 and 8. In this embodiment, the steel balls 2 advance along the spiral groove 11 and enter the outer return channel 400 from the through hole 410 of the lower casing 40. Specifically, when the steel balls 2 enter the return pipe structure 30, they will enter the lower return groove 4120 and the outer pipe 4130 of the lower housing 40, and the first upper return groove 521 and the second upper return groove 521 of the upper housing 50. The recirculation groove 541 moves in the outer recirculation channel 400.

Please also refer to FIGS. 9 to 11, which are respectively a three-dimensional exploded schematic diagram, a combined schematic diagram, and a combined three-dimensional appearance diagram of the second embodiment of the return pipe structure of the present invention. In this embodiment, the return pipe structure 30a includes a lower shell 40a and an upper shell 50a. In addition, the lower housing 40a includes two half-shells 41a that are oppositely joined. Each half-shell 41a includes a lower positioning block 411a, a lower bending section 412a extending from the lower positioning block 411a, and a lower bending section 412a connecting the lower bending section 412a. External pipe 413a. The lower positioning block 411a has a through hole 410a, the lower curved section 412a has a lower return groove 4120a communicating with the through hole 410a, and the lower external pipe 413a has a lower outer pipe 4130a communicating with the lower return groove 4120a. The two half shells 41a are connected to each other through the two lower external pipes 4130a to form a lower outer return channel 400a.

Furthermore, the upper shell 50a is an integrally injection-molded plastic shell seat, and the upper shell 50a is formed to correspond to the two half shell seat 41a with an upper outer return channel 500a covering the lower outer return channel 400a. The upper shell 50a covers the lower shell 40a so that the upper outer return passage 500a covers the lower outer return passage 400a.

It should be noted that in this embodiment, the side of the lower outer tube 4130a away from the lower outer tube 4130a is an arc surface (refer to FIG. 3), but it is not limited in actual implementation.

In addition, other structures of the return pipe structure 30a are substantially the same as those of the previous embodiment, and will not be repeated here.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to determine the patent scope of the present invention. Other equivalent changes using the patent spirit of the present invention should all belong to the patent scope of the present invention.

10: Screw

11: Spiral groove

12: Axle

20: Nut

21: Return channel

210: The first screw hole

22: Through hole

23: rolling groove

30: Return pipe structure

40: lower shell

41: half shell seat

410: Piercing

411: Lower positioning block

4111: Lower docking plane

412: Lower bending section

413: external pipe

4130: Outer tube

50: Upper shell

51: The first upper positioning block

511: First upper docking plane

52: The first upper bending section

53: outer container

54: The second upper bending section

55: The second upper positioning block

56: second screw hole

57: Screw

Claims (9)

An outer circulation ball screw with a return pipe structure, comprising: a screw with a plurality of spiral grooves; a screw cap sleeved on the screw, a side surface of the nut is provided with a return flow connecting the spiral grooves Channel; a return pipe structure, combined in the return channel, including: a lower shell, including two half shells oppositely joined, each of the half shells includes a lower positioning block arranged in the return channel, from the lower positioning block Extended lower bending section and an external pipe connecting the lower bending section, the lower positioning block has a through hole communicating with the spiral grooves, the lower bending section has a lower return groove communicating with the through hole, and the external pipe has a communicating An outer tube of the lower return groove, the two half-shells are connected to form an outer return channel through the two outer tubes; and an upper shell is an integral injection molded plastic shell, and the upper shell corresponds to the cover The upper housing includes a first upper positioning block, a first upper bending section extending from the first upper positioning block, and connecting the first upper An outer pocket of the curved section, a second upper curved section extending from the outer pocket, and a second upper positioning block connected to the second upper curved section, the first upper positioning block and the second upper positioning block Correspondingly engage the lower positioning blocks of the two-half shell seat, and the outer cavity contains the outer tube of the two-half shell seat. The outer circulating ball screw with a return pipe structure according to claim 1, wherein the nut has a through hole through which the screw can pass, and the inner edge of the through hole faces the spiral grooves and is formed with a plurality of rolling grooves. The outer circulation ball screw with a return pipe structure according to claim 1, wherein the two lower positioning blocks each have a lower butting plane, the first upper positioning block has a first upper butting plane, and the second upper positioning block has A second upper butting plane. The first upper butting plane and the second upper butting plane are respectively attached to the lower butting planes of the two lower positioning blocks. The outer circulation ball screw with a return pipe structure as described in claim 1, wherein one side of the lower curved section of the two-half housing has a plurality of bumps, and the first upper curved section and the second upper curved section A side surface is provided with a plurality of grooves, and the lower curved section of the two half-shells, the first upper curved section, and the second upper curved section are positioned through the mutual buckling of the protrusions and the grooves. The outer recirculation ball screw with a return pipe structure according to claim 4, wherein the first upper curved section has a first upper return groove, the second upper curved section has a second upper return groove, and the first upper curved section has a second upper return groove. An upper recirculation groove and the second upper recirculation groove respectively correspond to the lower recirculation grooves of the two lower bending sections. The outer circulating ball screw with a return pipe structure according to claim 1, wherein the nut is provided with a plurality of first screw holes on the periphery of the return channel, and the upper housing is provided with a plurality of first screw holes corresponding to the first screw holes There are two screw holes, and the upper shell passes through the second screw holes and the first screw holes through a plurality of screws to be locked on the nut. The outer circulating ball screw with a return pipe structure according to claim 1, wherein the upper shell is a flat surface on a side away from the nut. An outer circulation ball screw with a return pipe structure, comprising: a screw with a plurality of spiral grooves; A nut is sleeved on the screw, one side of the nut is provided with a return passage communicating with the spiral grooves; a return pipe structure, combined with the return passage, includes: a lower shell including a relative joint Each half-shell includes a lower positioning block arranged in the return channel, a lower bending section extending from the lower positioning block, and a lower external pipe connecting the lower bending section, the lower positioning block has a communication A perforation of the spiral grooves, the lower curved section has a lower return groove communicating with the perforation, the lower outer pipe has a lower outer pipe connecting the lower return groove, and the two half shells pass through the two lower outer pipes A lower outer return channel is formed by butting; and an upper shell, which is an integral injection-molded plastic shell seat. The upper shell is formed with an upper outer cover covering the lower outer return channel. The upper casing covers the lower casing so that the upper outer recirculation passage covers the lower outer recirculation passage. The upper casing includes a first upper positioning block and a first upper positioning block extending from the first upper positioning block. The first upper bending section, an outer receiving groove connected to the first upper bending section, a second upper bending section extending from the outer receiving groove, and a second upper positioning block connecting the second upper bending section, the first An upper positioning block and the second upper positioning block respectively correspondingly engage the lower positioning blocks of the two-half housing, and the outer cavity contains the outer tube of the two-half housing. The outer circulating ball screw with a return pipe structure according to claim 8, wherein the lower outer pipe is a circular arc surface on a side away from the lower outer pipe.

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