TWI509169B - Outside Circulation Ball Screws - Google Patents

Description

External circulation ball screw

The invention is a transmission element, in particular an outer circulation type ball screw.

According to the circulation mode of the ball screw, it is divided into an inner circulation type and an outer circulation type, and the selection of the inner circulation type or outer circulation type ball screw often depends on the use load condition of the ball screw. However, both the inner circulation type and the outer circulation type ball screw use the reflow element to achieve the purpose of the ball circulation.

As shown in the first figure of Japanese Patent Publication No. 2006342976, the nut is provided with a reflow element for guiding the reflow of the ball, and the reflow element is composed of a pair of recirculation blocks having a foot and a return pipe. Since the reflow block and the return pipe are of an integrated design, it is not easy to confirm the gap between the spacer ring and the ball when assembling the ball spacer in the case of assembling the ball screw, resulting in inconvenience in assembly.

Further, as shown in the fifth figure of Japanese Patent Publication No. 2007303590, a reflow member for guiding the reflow of the balls is provided on the nut, and the reflow member is separated into two. In this design, since the reflow element joint surface directly suffers from ball impact, the reflow element is easily damaged from the joint surface, reducing the service life of the reflow element.

For the improvement of the above technology, there is a ball screw reflow element (90) as shown in the first to second figures, and the reflow element (90) is divided into a straight pipe portion (91) and a leg portion (92), wherein The straight tube portion (91) of the reflow element (90) is divided into upper and lower covers (911), (912) to confirm the spacer ring and roll The gap between the beads, and the leg portion (92) is formed integrally, and the joint surface is directly damaged by the ball impact. However, the upper cover (911) of the straight pipe portion (91) protrudes from the pair of seats (913), and when the upper and lower covers (911) and (912) are combined, the alignment portion (913) is stuck under Inside the cover (912), the reflow element (90) is then secured to the nut through the outer cover (100). In this way, when the outer cover (100) is locked, the side cover (911) is separated from the side of the nut by the lateral pressure of the outer cover (100) (as indicated by the arrow in the sixth figure), and the lower cover is removed. (912), causing the lower cover (912) to be unable to support a portion of the upper cover (911) causes the upper cover (911) to be deformed by force, thereby affecting the ball circulation.

Based on the problems of the above-mentioned conventional techniques, the inventors of the present invention have succeeded in research and development, and the inventions which can achieve the object of the following inventions are finally born.

That is, the primary object of the present invention is to develop a manner of fitting the outer cover to the reflow element so that the upper cover of the reflow element is not deformed by the pressing force.

In order to achieve the above object, the present invention is an outer-circulating ball screw comprising: a plurality of rolling elements; a long axis extending in a direction into a strip-like structure defining the extending direction as an axial direction, the long axis The outer surface is provided with a spiral rolling groove; a nut having a through hole for the long shaft, the inner edge surface of the hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove and the rolling groove are formed a load path, the outer surface of the nut is provided with a groove, the groove is provided with two engaging holes, and the connecting holes are engaged with the rolling groove; The two reflow elements respectively have a guiding section and an engaging section, the guiding section and the engaging section are connected to each other in an L shape, and the reflowing element has a return passage extending through the guiding section and the engaging section, the guiding section The guiding section is provided with a guiding piece protruding toward the rolling groove, and the guiding piece guides the rolling element into and out of the returning path, and the connecting sections of the two reflowing elements are connected to each other. The ports of the return channels of the two connecting sections are connected to each other, and the ports of the return channels of the connecting sections of the returning elements are respectively connected with the load path to form a circulation path for the rolling elements; a fixed block is provided a receiving groove for receiving the two reflow elements, wherein the fixing block is disposed in the groove; wherein a surface of the reflow element opposite to the rolling element entering and leaving the return channel is in contact with a surface of the receiving groove, The contact surface is equal to or smaller than the diameter of the return flow path, and the accommodating groove and the reflow element are not in contact with each other on both sides of the rolling element in the direction of the return flow path.

In order to further understand the features and technical aspects of the present invention, reference should be made to the description of the embodiments of the present invention and the accompanying drawings. .

Prior art

(90) ‧‧‧Reflux components

(91)‧‧‧ Straight Tube Department

(92) ‧ ‧ feet

(911) ‧ ‧ upper cover

(912)‧‧‧Under the cover

(913) ‧‧‧Parts

(100) ‧ ‧ covers

this invention

(1) ‧ ‧ long axis

(11) ‧ ‧ rolling groove

(2)‧‧‧ Nuts

(21)‧‧‧Perforation

(211)‧‧‧ rolling trough

(22) ‧‧‧ Groove

(23)‧‧‧Connecting holes

(3) ‧‧‧Reflux components

(3A) ‧ ‧ lead section

(3B) ‧‧‧Connecting segments

(31) ‧ ‧ upper cover

(311)‧‧‧Half return flow

(32)‧‧‧Under the cover

(321) ‧‧‧Half return flow

(322)‧‧‧ Leading film

(33) ‧‧‧ Return Road

(4) ‧‧‧Fixed blocks

(41)‧‧‧through holes

(42) ‧‧‧ accommodating slots

(5)‧‧‧ screws

(6) ‧ ‧ rolling elements

(90)‧‧‧Load path

(L) ‧ ‧ contact surface

(X)‧‧‧Axis direction

(R) ‧ ‧ rolling elements in and out of the return path

The first figure is a system diagram of the outer circulation type ball screw of the present invention.

The second figure is a combination diagram of the outer circulation type ball screw of the present invention.

The third drawing is a cross-sectional view of the outer circulation type ball screw of the present invention.

The fourth drawing is a cross-sectional view of the outer circulation type ball screw of the present invention in the axial direction.

The fifth figure is a front view of the prior art reflow element.

The sixth figure is a schematic diagram of the use of prior art reflow elements and fixed blocks.

A preferred embodiment will be described below in conjunction with the drawings for the composition of the present invention. The parts and functions are further described, and the brief description of each figure is as follows: The first figure is a system diagram of the outer circulation type ball screw of the present invention.

The second figure is a combination diagram of the outer circulation type ball screw of the present invention.

The third drawing is a cross-sectional view of the outer circulation type ball screw of the present invention.

The fourth drawing is a cross-sectional view of the outer circulation type ball screw of the present invention in the axial direction.

Referring to the first to fourth figures, which are diagrams of a preferred embodiment of the present invention, the present invention is an outer circulation type ball screw comprising: a plurality of rolling elements (6); a long axis ( 1), extending in a direction into a strip-like structure, defining the extending direction as an axial direction (X), the outer surface of the long axis (1) is provided with a spiral rolling groove (11); a nut (2) , having a perforation (21) for the long axis (1), the inner edge surface of the perforation (21) is provided with a rolling groove (211) opposite to the rolling groove (11), the rolling groove (11) Forming a load path (90) with the rolling groove (211), the nut (2) is provided with a groove (22) on the outer diameter surface, and two engaging holes are formed in the groove (22). The two connecting holes (23) are engaged with the rolling groove (211); the two reflow elements (3) respectively have a guiding section (3A) and an engaging section (3B), and the guiding section (3A) and The connecting sections (3B) are L-shaped to each other, and the returning element (3) has a return passage (33) extending through the guiding section (3A) and the engaging section (3B), the guiding section (3A) Inserted into the engaging hole (23), the guiding section (3A) is provided with a guiding piece (322) protruding toward the rolling groove (211), The guiding piece (322) guides the rolling element (6) into and out of the returning channel (33), and the connecting sections (3B) of the two reflowing elements (3) are coupled to each other to return the two connecting sections (3B). (33) ports of each other Connecting, the ports of the return channel (33) of the connecting section (3B) of the reflow element (3) are respectively engaged with the load path (90) to form a circulation path for the rolling body (6); In an embodiment, the reflow element (3) is composed of an upper cover (31) and a lower cover (32), and the upper cover (31) and the lower cover (32) are respectively provided with a half return passage (311, 321), and the upper cover (31) is provided on the lower cover (32). After the upper cover (31) is engaged with the lower cover (32), the two return flow paths (311, 321) constitute the return flow path (33); a fixed block (4), which is provided with a receiving groove (42) for receiving the two reflow elements (3), the fixing block (4) is provided with a plurality of through holes (41), the through holes (41) providing plural The screw (5) is threaded, and the screw (5) is screwed with a screw hole (not shown) provided by the nut (2) to fix the fixing block (4) to the groove (22); Wherein, the surface of the reflow element (3) in the direction (R) of the rolling element (6) entering and exiting the return channel (33) is in contact with the surface of the receiving groove (42), as shown in the third figure. As shown in the figure, in the direction (R) of the rolling element (6) entering and exiting the return channel (33), the receiving groove (42) is in phase with the surface of the reflow element (3) Contact (L), the mutual contact (L) plane is equal to or smaller than the diameter of the return passage (33), and the accommodating groove (42) and the reflow element (3) are not in contact with each other on both sides of the direction (R) In this way, the problem that the upper cover (31) is deformed when the fixed block (4) presses the reflow element (3) is prevented, and the rolling element (6) is not smoothly circulated.

In view of the above, the "industrial availability" of the present invention should be unquestionable. In addition, the feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been disclosed. Use, not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the present invention Both novelty and "progressiveness" have been in compliance with patent laws and regulations, and applications for invention patents have been filed in accordance with the law, and pray for review and early grant of patents.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

(1) ‧ ‧ long axis

(11) ‧ ‧ rolling groove

(2)‧‧‧ Nuts

(21)‧‧‧Perforation

(211)‧‧‧ rolling trough

(22) ‧‧‧ Groove

(23)‧‧‧Connecting holes

(3) ‧‧‧Reflux components

(3A) ‧ ‧ lead section

(322)‧‧‧ Leading film

(33) ‧‧‧ Return Road

(4) ‧‧‧Fixed blocks

(42) ‧‧‧ accommodating slots

(6) ‧ ‧ rolling elements

(90)‧‧‧Load path

(L) ‧ ‧ contact surface

(R) ‧ ‧ rolling elements in and out of the return path

Claims (2)

An outer circulation type ball screw comprises: a plurality of rolling elements; a long shaft extending in a direction into a long strip structure, wherein the extending direction is an axial direction, and a surface of the long shaft is provided with a spiral rolling groove; a nut having a through hole for the long shaft, the inner edge surface of the hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove and the rolling groove form a load path, and the nut is outside The surface of the radial surface is provided with a groove, and two engaging holes are formed in the groove, and the two connecting holes are engaged with the rolling groove; the two reflow elements respectively have a guiding section and a connecting section, and the guiding section is connected with the guiding section The segments are connected to each other in an L-shape, and the reflow member has a return passage extending through the guiding portion and the engaging portion. The guiding portion is inserted into the engaging hole, and the guiding portion is provided to be convex toward the rolling groove. a guiding piece for guiding the rolling elements into and out of the returning path, and the connecting sections of the two reflowing elements are coupled to each other such that the ports of the returning channels of the connecting sections are connected to each other, and the connecting sections of the two reflowing elements are connected to each other. The port of the return channel is connected to the load path And forming a circulation path for the rolling element; a fixing block provided with a receiving groove for receiving the two reflow elements, wherein the fixing block is disposed in the groove; wherein the reflow element is opposite to the rolling The surface of the body entering and exiting the return channel is in contact with the surface of the accommodating groove, and the contact surface is equal to or smaller than the diameter of the return channel, and the accommodating groove is adjacent to the two sides of the rolling element in the direction of the return channel The reflow elements are not in contact with each other. The recirculating ball screw according to claim 1, wherein the reflow element is composed of an upper cover and a lower cover, wherein the upper cover and the lower cover are respectively provided with a half return flow, and the upper cover is provided on the lower cover, After the upper cover and the lower cover are engaged, the two return flow passages constitute the return flow path.