TWI445890B - Positioning structure for a circulating element of a ball screw - Google Patents

Description

Ball screw reflow element positioning structure

The present invention relates to a ball screw, and more particularly to a ball screw reflow element positioning structure.

The ball screw system is provided with a nut from a screw casing, and a plurality of balls are arranged between the screw and the nut, so that the balls are cyclically rolled between the screw and the nut and the impact of each ball recirculation is eliminated. For the force, the reflow element is axially mounted on the end face of the nut, and the general reflow element axis is positioned on the nut by:

As shown in FIG. 1, one of the drawings of U.S. Patent No. 5,664,459 is shown, which is mainly provided with a reflow element 11 behind the nut 12, and an elastic C-shaped buckle 13 is placed on the nut 12. In the groove 121, the C-shaped buckle 13 is restricted by the axial displacement, and the C-shaped buckle 13 is pressed against the reflow element 11 to complete the positioning of the reflow element 11. However, since the reflow element 11 is subjected to the The bearing surface 111 pressed against the pressing surface 131 of the C-shaped buckle 13 is insufficient, and the reflow element 11 is easily loosened in the nut 12, and the impact force of each of the balls is not effectively eliminated, and the standard type is The ears 132 at both ends of the C-shaped buckle 13 are too large to be assembled.

Secondly, as in US Pat. No. 7,591,205, a positioning piece is mainly disposed on the reflow element. After the reflow element is disposed on the nut, the positioning piece is rotated to be engaged in the groove of the nut to make the reflow. The component is positioned, however, the recess in the nut is not a ring design and therefore has a drawback of being difficult to machine.

Therefore, how to develop a ball screw reflow element positioning structure, which can simultaneously solve the above defects is the motive for the research and development of the present invention.

It is an object of the present invention to provide a ball screw reflow element positioning structure that positions the reflow element by means of rotational clamping to achieve easy assembly and convenient processing.

In order to achieve the foregoing objective, the present invention provides a ball screw reflow element positioning structure, comprising: a screw having an axis; a nut disposed on the screw along the axis direction and comprising a winding a ring wall surface disposed on the axis, a ring end surface connected to the end edge of the ring wall surface, a plurality of convex portions protruding from the ring wall surface and forming a concave portion with the ring end surface, and a ring end surface along the axis direction a recessed receiving groove; a reflow element is disposed in the receiving groove along the axis direction, and has a bearing surface in the same plane as the ring end surface; a positioning ring having an outer ring surface and a connection a pressing abutment surface of the outer ring surface end edge and pressing against the end surface of the nut ring and the bearing surface of the reflow element; a plurality of wings protruding from the outer ring surface and being clamped to the concave portion of the nut, a first end surface disposed on one end surface of the wing portion and in the same plane as the pressing contact ring surface to press against the end surface of the nut ring and the bearing surface of the returning element, and being disposed on the other end surface of the wing portion a second end surface against which the convex portion is pressed.

Secondly, in order to achieve the foregoing object, the present invention further provides a ball screw reflow element positioning structure, wherein a positioning ring for pressing against the bearing surface of the reflow element can be pressed only through the first end surface of the positioning ring. The bearing surface of the reflow element can be used.

Furthermore, in order to achieve the foregoing object, the present invention further provides a ball screw reflow element positioning structure, wherein a positioning ring for pressing against the bearing surface of the reflow element can pass only the ring-shaped ring pressure of the positioning ring It is sufficient to reach the bearing surface of the reflow element.

With regard to the techniques, means, and other effects of the present invention in order to achieve the above objects, three preferred embodiments are described in detail with reference to the drawings.

Referring to Figures 2 to 6, a ball screw reflow element positioning structure according to a first embodiment of the present invention is mainly composed of a screw 20, a nut 30, a reflow element 40, and a positioning ring 50. Composition, wherein: the screw 20 has an axis 21.

The nut 30 is sleeved on the screw 20 in the direction of the axis 21, and a plurality of balls 61 are disposed between the nut 30 and the screw 20, and the screw 20 includes a ring wall surface 31 disposed around the axis 21, a ring end surface 32 connected to an end edge of the ring wall surface 31, a plurality of convex portions 34 protruding from the ring wall surface 31 and forming a concave portion 33 with the ring end surface 32, and a ring end surface 32 along the axis 21 The accommodating groove 35 is recessed in the direction. In this embodiment, the nut 30 has a dodging space 36 between the two convex portions 34.

The reflow element 40 is disposed in the accommodating groove 35 along the axis 21 and has a bearing surface 41 facing the convex portion 34.

The positioning ring 50 has an outer ring surface 51, a pressing ring surface 52 connected to the end edge of the outer ring surface 51 and pressed against the ring end surface 32 of the nut 30 and the bearing surface 41 of the reflow element 40. a wing portion 53 protruding from the outer ring surface 51 and being fastened to the recess 33 of the nut 30 is disposed on an end surface of the wing portion 53 and is flush with the pressing ring surface 52 to press the nut a 30-ring end surface 32 and a first end surface 531 of the bearing surface 41 of the reflow element 40, and a second end surface 532 disposed on the other end surface of the wing portion 53 and pressed by the convex portion 34. In this embodiment, each of the The wing portion 53 can pass through the dodging space 36 between the two convex portions 34 of the nut 30, and each of the wing portions 53 has a first end 533 and a second end 534, and the second end surface 532 of the wing portion 53 is a bevel And inclined by the first end 533 toward the second end 534.

The above is the structure and configuration description of each main component of the first embodiment of the present invention.

Please refer to the following description for the assembly method of the present invention.

Referring to FIGS. 7 and 8 , the reflow element 40 is first disposed in the accommodating groove 35 of the nut 30 along the axis 21 , and the bearing surface 41 of the reflow element 40 and the ring end surface 32 of the nut 30 are provided. Located in the same plane; secondly, the two wing portions 53 of the positioning ring 50 correspond to the doffer space 36 of the nut 30.

Referring to FIGS. 9 and 10, the positioning ring 50 is disposed in the nut 30 in the direction of the reflow element 40, so that the two wing portions 53 of the positioning ring 50 pass through the doffer space 36 of the nut 30, and the snail is located at the snail. The cap 30 has a convex portion 34 and the ring end surface 32.

Referring to Figures 3, 4, and 5, the positioning ring 50 is rotated at an angle such that the two wing portions 53 of the positioning ring 50 are clamped to the concave portion 33 of the nut 30, that is, the wing portion 53 is clamped to the convex portion. Between the portion 34 and the end surface 32 of the ring, the positioning ring 50 is positioned. At this time, the pressing ring surface 52 of the positioning ring 50 and the first end surface 531 are simultaneously pressed against the ring end surface 32 of the nut 30 and The bearing surface 41 of the reflow element 40 is configured to sufficiently position the reflow element 40 to prevent loosening of the reflow element 40 in the nut 30, and the impact force of each of the balls backflow cannot be effectively eliminated.

Accordingly, the present invention allows the positioning ring 50 to position the reflow element 40 via a rotationally locking manner, which is indeed convenient for assembly, and the rotary positioning method of the present invention is used in a small-sized ball screw. It also highlights the convenience of assembly. In addition, the recess 33 for locking the two wing portions 53 of the positioning ring 50 is defined by each of the convex portions 34 and the ring end surface 32, and the convex portion 34 is designed to be on the annular wall surface of the nut 30. 31 settings, so it is easy to process.

As shown in FIG. 11A, the positioning ring 50A further has a pair of inner annular faces 54A that should be the outer annular faces 51A, and the inner annular faces 54A and the outer annular faces 51A are concentric circles, so that they are not applied at both ends. Ball screw for teething.

Referring to FIG. 11B, the positioning ring 50B further has a pair of inner annular faces 54B that should be the outer annular faces 51B, and the inner annular faces 54B and the outer annular faces 51B are concentric circles, and the inner annular faces 54B The outer annular surface 51B is concentrically rounded, whereby a ball screw that taps at both ends is applied.

Referring to FIG. 12, the design principle of the present invention can also be applied to the dustproof end cover 70 of the ball screw, that is, the dust end cover 70 is rotated by a dust ring 71 positioned on the nut 30 (same as the positioning of the present invention). The ring structure design) and an annular wool felt 72 fixed to the inner surface of the dustproof ring 71.

Referring to Figures 13 and 14, a ball screw reflow element positioning structure according to a second embodiment of the present invention is also provided by a screw 20, a nut 30, a reflow element 40C, and a positioning ring 50C. The composition is the same as the first embodiment, and therefore will not be described again here. The second embodiment is different from the first embodiment in that the reflow element 40C is along the axis 21 of the screw 20. The direction is disposed in the receiving groove 35 of the nut 30, and has a bearing surface 41C facing the convex portion 34 of the nut 30, and in addition, a positioning ring for pressing against the bearing surface 41C of the reflow element 40C. The 50C can be pressed against the bearing surface 41C of the reflow element 40C only through the first end surface 531C of the positioning ring 50C, thereby achieving another implementation state.

Referring to Figures 15 and 16, a ball screw reflow element positioning structure according to a third embodiment of the present invention is also provided by a screw 20, a nut 30, a reflow element 40D, and a positioning ring 50D. The composition is the same as the first embodiment, and therefore will not be described again here. The third embodiment is different from the first embodiment in that the reflow element 40D is along the axis 21 of the screw 20. The direction is disposed on the receiving groove 35 of the nut 30 and has a bearing surface 41D facing the convex portion 34 of the nut 30, and in addition, a positioning ring for pressing against the bearing surface 41D of the reflow element 40D. The 50D can be pressed against the bearing surface 41D of the reflow element 40D only through the pressing ring surface 52D of the positioning ring 50D, thereby achieving another implementation state.

In addition, referring to FIG. 17, the first end surface 531D of the positioning ring 50D is away from the bearing surface 41D of the reflow element 40D than the pressing ring surface 52D.

In the above, the embodiments and the illustrations are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equal variations and modifications made by the scope of the present invention. It should be within the scope of the patent of the present invention.

"Use"

11. . . Reflow element

111. . . Bearing surface

12. . . Nut

121. . . Groove

13. . . C buckle

131. . . Pressing surface

132. . . Ear

"this invention"

20. . . Screw

twenty one. . . Axis

30. . . Nut

31. . . Ring wall

32. . . Ring end face

33. . . Pinch

34. . . Convex

35. . . Locating slot

36. . . Dodge space

40, 40C, 40D. . . Reflow element

41, 41C, 41D. . . Bearing surface

50, 50A, 50B, 50C, 50D. . . Locating ring

51, 51A, 51B. . . Outer torus

52, 52D. . . Pressing the torus

53. . . Wing

531, 531C, 531D. . . First end face

532. . . Second end face

533. . . First end

534. . . Second end

54A, 54B. . . Inner annulus

61. . . Ball

70. . . Dustproof end cap

71. . . Dust ring

72. . . Wool felt

Figure 1 is one of the drawings of U.S. Patent 5,664,459.

Fig. 2 is an exploded perspective view showing the first embodiment of the present invention.

Fig. 3 is a perspective assembled view of the first embodiment of the present invention.

Fig. 4 is a cross-sectional view of Fig. 3 showing the state in which the positioning ring is stuck to the nut.

Figure 5 is a cross-sectional view of line 5-5 of Figure 3.

Fig. 6 is a perspective view showing the first embodiment of the present invention, showing the three-dimensional state of the positioning ring.

Figure 7 is a perspective exploded view of the first embodiment of the present invention, showing a state in which the reflow element is positioned on the nut and the positioning ring is separated from the nut.

Figure 8 is a cross-sectional view of Figure 7.

Fig. 9 is a perspective view showing a first embodiment of the present invention, showing a state in which a positioning ring is provided in a nut but is not rotationally locked.

Figure 10 is a cross-sectional view of Figure 9.

Fig. 11A is a side view showing the first embodiment of the present invention, showing a state in which the inner annular surface and the outer annular surface of the positioning ring are concentrically circular.

Fig. 11B is a side view showing the first embodiment of the present invention, showing a state in which the inner ring surface and the outer ring surface of the positioning ring are concentrically circular.

Fig. 12 is a perspective view showing the first embodiment of the present invention, showing a state in which the dustproof end cap is separated from the nut.

Figure 13 is a perspective exploded view of a second embodiment of the present invention.

Figure 14 is a perspective assembled view of a second embodiment of the present invention, showing a state in which the reflow element and the positioning ring abut each other.

Figure 15 is a perspective exploded view of a third embodiment of the present invention.

Figure 16 is a perspective assembled view of a third embodiment of the present invention, showing a state in which the reflow element and the positioning ring abut each other.

Figure 17 is a side view showing another embodiment of the third embodiment of the present invention, showing a state in which the first end surface of the positioning ring is pressed against the abutment surface of the reflow member.

20. . . Screw

twenty one. . . Axis

30. . . Nut

31. . . Ring wall

32. . . Ring end face

33. . . Pinch

34. . . Convex

35. . . Locating slot

40. . . Reflow element

41. . . Bearing surface

50. . . Locating ring

51. . . Outer torus

52. . . Pressing the torus

53. . . Wing

531. . . First end face

532. . . Second end face

533. . . First end

534. . . Second end

61. . . Ball

Claims (8)

A ball screw reflow element positioning structure comprises: a screw having an axis; a nut sleeved on the screw along the axis direction, and comprising a ring wall surface disposed around the axis, and a ring wall surface connected to the ring wall a ring end surface of the end edge, a plurality of convex portions protruding from the ring wall surface and forming a concave convex portion with the ring end surface, and a receiving groove recessed in the axial direction from the ring end surface; a reflow element is along the The axial direction is disposed in the accommodating groove and has a bearing surface facing the convex portion; a positioning ring has an outer ring surface, and is connected to the end edge of the outer ring surface and pressed against the end surface of the nut ring a returning ring surface of the returning element bearing surface, a plurality of wings protruding from the outer ring surface and being clamped to the nut, a first end disposed at one end of the wing portion, and a wing disposed on the wing a second end of the other end of the portion, a first end surface disposed on an end surface of the wing portion and in the same plane as the pressing ring surface to press against the end surface of the nut ring and the bearing surface of the returning element, a second end surface of the other end surface of the wing portion and pressed by the convex portion, the second end surface is from the first end toward the second end To tilt. A ball screw reflow element positioning structure comprises: a screw having an axis; a nut sleeved on the screw along the axis direction, and comprising a ring wall surface disposed around the axis, and a ring wall surface connected to the ring wall a ring end surface of the end edge, a plurality of protrusions protruding from the ring wall surface and forming a concave convex portion with the ring end surface, and a a receiving groove recessed along the axial direction of the ring end surface; a reflow element disposed in the accommodating groove along the axis direction and having a bearing surface facing the convex portion; a positioning ring having an outer ring surface a pressing ring surface connected to the end edge of the outer ring surface, a plurality of wings protruding from the outer ring surface and being fixed to the nut, and a first end disposed at one end of the wing portion, a second end disposed at the other end of the wing portion, a first end surface disposed on an end surface of the wing portion and pressed against the bearing surface of the returning member, and being disposed on the other end surface of the wing portion and being pressed by the convex portion The second end surface of the abutting portion is inclined by the first end toward the second end. A ball screw reflow element positioning structure comprises: a screw having an axis; a nut sleeved on the screw along the axis direction, and comprising a ring wall surface disposed around the axis, and a ring wall surface connected to the ring wall a ring end surface of the end edge, a plurality of convex portions protruding from the ring wall surface and forming a concave convex portion with the ring end surface, and a receiving groove recessed in the axial direction from the ring end surface; a reflow element is along the The axial direction is disposed in the accommodating groove and has a bearing surface facing the convex portion; a positioning ring has an outer annular surface, and is connected to the outer annular surface end edge and pressed against the returning element bearing surface Pressing the torus, a plurality of wings protruding from the outer ring surface and being clamped to the nut, a first end disposed at one end of the wing portion, and a second end disposed at the other end of the wing portion a first end surface disposed on one end surface of the wing portion, and a second end surface disposed on the other end surface of the wing portion and pressed by the convex portion, The second end face is inclined by the first end toward the second end. The ball screw reflow element positioning structure according to the first, second or third aspect of the invention, wherein the nut has a dodge space between the two convex portions for the passage of the positioning ring wing. The ball screw reflow element positioning structure according to claim 1, wherein the positioning ring further has a pair of inner annular faces that should have an outer annular surface, and the inner annular surface and the outer annular surface are Concentric circles. The ball screw reflow element positioning structure according to claim 1, wherein the positioning ring further has a pair of inner annular faces that should have an outer annular surface, and the inner annular surface and the outer annular surface are Different hearts are round. The ball screw reflow element positioning structure according to claim 2, wherein the pressing ring of the positioning ring is pressed against the ring end surface of the nut. The ball screw reflow element positioning structure according to claim 3, wherein the first end surface of the positioning ring is farther away from the bearing surface of the reflow element than the pressing end surface.