JP4473835B2 - Adjustable preload structure of ball screw - Google Patents

Description

  The present invention relates to an adjustable preload structure, and more particularly to an adjustable preload structure for a ball screw.

  Since ball screws have advantages such as transmission precision or transmission reliability, they are always widely applied in precision machines, controlled to move or lift the work table laterally, backlash It is intended to be used to remove

  Usually, the structural design is a so-called adjustable ball screw adjustable preload structure as shown in FIGS. The adjustable preload nut 10, 11, 12, 13 adjusts the distance between the nuts 10, 11, 12, 13 depending on whether the screw 111 or the screw 14 is used. The purpose of adjusting can be reached. However, although this method can adjust the preload, it is relatively complicated in structure, so that the screw 111 must be formed on the outer surface of the nut 11. Further, on the surface in contact with the nut 12, a space for tightening the screw 14 must be provided, and the preload is adjusted by rotating the screw so that it can be processed, manufactured, or assembled. Obviously, it takes time or man-hours, so it is natural that the production cost increases.

  In view of the above, in order to solve the above-described problems, the present invention mainly aims to provide an adjustable preload structure for a ball screw.

  It is possible to apply two combined preloading plates, and use the control with screws to displace different degrees of magnitude and generate different magnitudes of preload accordingly . Therefore, since the adjustment of the preload can be performed without depending on the experience of the installer, the advantage that is standardized in the production can be easily achieved.

  As an advantage of the present invention, an adjustable preload structure for a ball screw is provided, and since the preload can be controlled by a radial pressing force required when the ball screw is attached, it has an actual effect that is easy to adjust.

  Another advantage of the present invention is that it provides an adjustable preload structure for a ball screw, which can be controlled by adjusting the length of the protruding portion of the tightening key or the thickness of the pad. In terms of change, it is extremely simple and has a real effect.

The adjustable preload structure of the ball screw provided by the present invention is such that two preload pieces are attached between the nuts of the ball screw, and the relative position of the two preload pieces is changed to change the contact between the nuts. In the adjustable preload structure of the ball screw, the distance is adjusted and the preload of the ball screw is adjusted,
Slopes are formed on the opposing end faces of the respective preloading pieces, the preloading pieces are fitted between the nuts in a state where the slopes of the preloading pieces are in contact with each other, and a tightening key is interposed between the nuts. A fixed groove is formed on one preloading piece to receive the tightening key, and a plurality of holes are formed on the end surface of the other preloading piece. A piece is integrally joined with an adjacent nut, an adjustment screw is screwed onto the tightening key, and the contact relative position of each preload piece is changed by tightening the adjustment screw, and the combined thickness of both preload pieces changes. By doing so, different amounts of pre-pressure are generated in the ball screw. In addition, one preloading piece having a recessed groove is formed with a coupling rib on the end surface opposite to the inclined surface, and a coupling groove corresponding to the coupling rib is formed on the end surface of the nut adjacent to the end surface. And the connecting groove prevent sliding displacement in the circumferential direction of the preloading piece and ensure sliding displacement in the radial direction.

  In order for the examiner to better understand the structure, features and other advantages of the present invention, a more preferred embodiment will be described in more detail below with reference to the drawings.

Referring to FIGS. 3 to 4, the adjustable preload structure of the ball screw provided by the present invention is attached between both nuts 2 and 3 of the ball screw, and generates a preload by a change in displacement. A ball screw adjustable preload structure that can achieve preload adjustment,
The preloading structure is generally composed of two preloading plates 4 and 5, and one end surface of each preloading plate 4 and 5 forms inclined surfaces 41 and 51, respectively. Relative displacement of the preloading plates 4 and 5 is achieved by fitting between the nuts 2 and 3 of the ball screw and contacting the inclined surfaces 41 and 51 of the preloading plates 4 and 5 in correspondence with each other. By operation, it is possible to receive the force between the nuts 2 and 3, thereby causing a change in the combined thickness of the preloading plates 4 and 5, thereby generating different amounts of preload.

  Furthermore, the operation principle of generating the preload in the present invention will be clarified with reference to FIGS. 4, 5A, 5B and 5C. One end face of each preloading plate 4, 5 is cut into slopes 41, 51, and the sandwich angle between the slopes 41, 51 and the other corresponding faces 42, 52 is α, When the relative displacement is made in the parallel direction from the overlapped state (shown in FIG. 5A), when the amount of movement is ΔL, the vertical direction will increase ΔH (ΔH = ΔL × tan α) (shown in FIG. 5B). ) In this way, different preloads are generated between the nuts 2 and 3. As shown in FIG. 5C, when the radial force applied during assembly is F2, the acting force on the contact surface between the preloading plates 4 and 5 and the nuts 2 and 3 (ie, preloading) The pressure) is F1, and F3 is representative of the acting force of the inclined surfaces 41, 51 of each preloading plate 4, 5.

As shown in FIG. 3, the preload structure of the present invention is mainly composed of two preload plates 4, 5, a pad 6, a tightening key 7 and an adjusting screw 76. A concave groove 53 for placing the attached key 7 is opened, and a plurality of holes 411 are provided on the surface of the other preloading plate 4. The preload plate 4 and the adjacent nut 2 are integrally coupled by being implanted into the holes 411 using a stereotaxic pin. The coupling rib 521 to an end surface 52 opposite the inclined surface 51 of the preload plate 5 groove 53 is opened is Ru is formed. Also the end surface of the nut 3 adjacent the end face 52, a coupling groove 31 which correspond to the coupling ribs 521 are made form. As described above, by coupling with the coupling groove 31 of the coupling rib 521 and the nut 3, Ru can perform a sliding displacement operation preload plate 5 receives the thrust of the action of the radial direction. In addition, it should be noted that a pad 6 can be further inserted between the concave groove 53 of the preload plate 5 and the tightening key 7. Of course, one or more pads 6 can be arranged in order to control the change in the preload size, and the larger the number of arranged pads 6, the larger the preload.

  As shown in FIGS. 3 and 4, the tightening key 7 according to the present invention may be formed in a shape close to a T-type key, and in this way, the protruding portion 71 of the tightening key 7 is used. Thus, it can be brought into contact with the pad 6 and further achieved for the purpose of pressing the preloading plate 5. Further, the locking grooves 22 and 32 of the nuts 2 and 3 are locked to each other by using the extending portions 72 on both sides, so that the nuts 2 and 3 can be coupled. Further, in order to achieve complete coupling, a fixing screw hole 73 can be opened on the tightening key 7. By tightening the screw 74, the tightening key 7 and the nuts 2 and 3 are integrated. Combined with In addition, in order to control the forward / backward displacement of the preloading plate 5, an adjustment screw hole 75 can be opened on the tightening key 7, and the preloading plate 5 is pressed by tightening the adjusting screw 76. The preload can be adjusted.

  In view of the above, the structure disclosed in the embodiment of the present invention can be applied to two preload pieces, and needs to be adapted to production by displacing different sizes using screws. Since different pre-loads are obtained and adjustment of the pre-load is completely independent of the assembly operator's experience, the standardized advantages can be easily achieved in production.

  Although the preferred embodiments and design drawings of the present invention are described above, they are merely used for convenience of explanation of the present invention, and do not limit the technology or claims of the present invention, and technical means equivalent thereto. Alternatively, a person who implements based on the scope of rights included in the content of the “claims” of the present invention shall fall within the scope of the present application without departing from the scope of the present invention.

It is sectional drawing which shows the adjustable preload structure of the conventional ball screw. It is sectional drawing which shows the local part of the adjustable type preload structure of another conventional ball screw. It is a three-dimensional perspective view of the present invention. It is sectional drawing which shows the state which combined this invention. It is a figure which shows the joining state of the preload piece shown to this invention. It is a figure which shows the parallel movement state of the preload piece shown to this invention. It is a figure which shows the load state of the sheet of preload shown in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Nut 11 Nut 111 Screw 12 Nut 13 Nut 14 Screw 2 Nut 22 Locking groove 3 Nut 31 Coupling groove 32 Locking groove 4 Preload piece 41 Slope 411 Hole 42 Corresponding surface 5 Preload piece 51 Slope 52 Corresponding surface 53 Concave groove 521 Bonding rib 6 Pad 7 Tightening key 71 Projection part 72 Extension part 73 Fixing screw hole 74 Screw 75 Adjustment screw hole 76 Adjustment screw

Claims (2)

Two preload pieces are attached between both nuts of the ball screw, and the distance between the nuts is adjusted by changing the contact relative position of the two preload pieces, thereby adjusting the preload of the ball screw. In the adjustable preload structure of the ball screw,
Slopes are formed on the opposing end faces of the respective preloading pieces, the preloading pieces are fitted between the nuts in a state where the slopes of the preloading pieces are in contact with each other, and a tightening key is interposed between the nuts. A fixed groove is formed on one preloading piece to receive the tightening key, and a plurality of holes are formed on the end surface of the other preloading piece. A piece is integrally joined with an adjacent nut, an adjustment screw is screwed onto the tightening key, and the contact relative position of each preload piece is changed by tightening the adjustment screw, and the combined thickness of both preload pieces changes. As a result, preloads of different sizes are generated in the ball screw, and the one preload piece in which the concave groove is formed has a coupling rib formed on an end surface opposite to the inclined surface, and a nut adjacent to the end surface Corresponds to the connecting rib on the end face of Binding groove is formed, balls and reliably characterized to Rukoto sliding displacement in the radial direction while preventing circumferential slide displacement of the preload piece by combining the coupling groove and the coupling rib Adjustable preload structure of screw. The adjustable preload structure according to claim 1, wherein the pad is characterized in that it is inserted between the groove and the key the tightening of the preload piece.

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