JP2007247778A - Circulating component to be used for ball screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circulating component usable in common for ball screws having various types of different leads, which is simplified in specifications and reduced in manufacturing cost. <P>SOLUTION: A recess is formed in the circulating component corresponding to the track of a ball screw. The recess includes a tangential direction change position and a thread track removal position. The thread track removal position is located near a recess entrance, and the upper edge wall face and the lower edge wall face of the recess entrance form angles of inclination to a horizontal direction, respectively. The angle of inclination of the upper/lower wall face is smaller than or equal to the minimum/maximum lead angle in the common ball screw. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a circulating part that is applied to a ball screw, and more particularly to a circulating part that is applied to a ball screw having a variety of different lead angles by changing the geometrical outline of the circulating part recess inlet.

The ball circulation device of a general ball screw is divided into an external circulation type circulation structure, an internal circulation type circulation structure, and an end plug type circulation structure. Among them, only the end plug type circulation structure is provided on the nut end face of the ball screw as shown in FIGS. The conventional circulation component 4 is provided corresponding to the end face of the nut 3, and the circulation component 4 is formed with a recess 41 corresponding to the circulation flow path 31 of the nut 3. The recess inlet 42 of the recess 41 is further connected to a ball screw raceway (not shown) so that the rolling parts can be turned and circulated to complete the reflux circulation.
As shown in FIG. 3, considering the different reed ball screws, the main differences between the conventional circulating parts 4 are the tangential direction and the circumferential inclination angle (ie, the lead angle) when the rolling parts leave the track. There is a difference in angle α). Taking an outer diameter of 20 mm as an example, when the lead (thread pitch) is 5 mm, the lead angle is 4.54 degrees. When the lead is 10mm, the lead angle is 9.04 degrees. When the lead is 20 mm, the lead angle is 17.65 degrees. When the lead is 40 mm, the lead angle is 32.48 degrees.
If the same recirculating part 4 is used for ball screws with different leads, when the rolling part leaves the raceway and enters the recess 41, it must leave the raceway on the one hand and, on the other hand, the cut line angle must not be corrected. In other words, an irregular operation is likely to occur, and the smoothness of the operation of the equipment is easily affected.
That is, the recess inlet 42 of the circulation part 4 recess 41 is installed in accordance with the lead angle, and the circulation parts 4 of the corresponding lead angle α are combined with the ball screws of the different leads. A mold must be made for each standard. For this reason, the manufacturing cost of the mold is high. In addition, maintenance is not easy, and the manufacturing cost of the circulating component 4 increases. Manufacturers also have to prepare stocks of various types of circulating parts at the same time, which in turn increases the inventory cost. Furthermore, there is a possibility of picking up the circulating part 4 with the wrong lead angle, which leads to troubles in assembling the ball and screw, so a further improvement has been awaited.
More specifically, the conventional ball screw that matches a specific lead with a single circulating part has a problem that it does not match the development trend of common parts, resulting in complexity of inventory and assembly, and an increase in manufacturing cost.

The present invention has been made in view of the above-mentioned problem that the circulating parts cannot be shared. The object of the present invention is that when the rolling parts leave the track and change the position in the tangential direction, The object is to provide a ball screw circulation part having a large range of recess inlets.
It is another object of the present invention to provide a ball screw circulating component that can be applied to a variety of different types of reed ball screws and that can improve economic effects and benefits.
Another object of the present invention is to provide a circulating component that can change the cutting line path of the rolling component.
Another object of the present invention is to provide a circulating component that can satisfy both the minimum lead angle and the maximum lead angle of a ball screw.

  In order to achieve the above-described problem, the circulating component used in the ball screw according to the first invention of the present application is provided with the circulating component corresponding to the nut end surface of the ball screw, and a recess is provided on the circulating component. The both ends of the recess are connected to the ball screw raceway and the nut circulation passage, respectively.

  The circulating component used in the ball screw according to the second invention of the present application is the first invention, wherein the recess of the circulating component has a recess inlet corresponding to the track of the ball screw, and the recess is Also, it is configured to correspond to the cutting direction change position corresponding to the nut circulation flow path and the ball / screw trajectory, and the thread trajectory separation position of the recess inlet has an upper edge wall surface and a lower edge wall surface inclined outward, The edge wall surface and the lower edge wall surface are not parallel to each other, and an inclination angle β is formed in the horizontal direction of the upper edge wall surface, and the inclination angle γ is also formed in the lower edge wall surface in the horizontal direction.

  In the circulating component used in the ball screw according to the third invention of the present application, in the first invention, the inclination angle γ of the upper edge wall surface is smaller than or equal to the maximum lead angle αmax of the shared circulating component. Features.

  In the first invention, the circulating component used in the ball screw according to the fourth invention of the present application is formed such that the upper edge wall surface and the lower edge wall surface of the recess entrance have a tilt angle θ after projecting on a flat surface. It is characterized by.

  The circulating part used in the ball screw according to the fifth invention of the present application, in the first invention, the length of the thread trajectory separation position of the recess is that the lower edge wall surface and the recess from the end face of the circulating part recess inlet. L ≦ D ball, where L is the horizontal distance to the intersection and D ball is the diameter of the rolling part.

  The circulating component used in the ball screw according to the sixth invention of the present application is the first invention, wherein the recess is configured to correspond to the cutting direction change position corresponding to the nut circulation flow path and the ball screw trajectory. It is characterized by being.

  The circulating component used in the ball screw according to the seventh invention of the present application is characterized in that, in the first invention, the inclination angle of the recess inlet is an angle inclined outward.

  The circulating component used in the ball screw according to the eighth invention of the present application is characterized in that, in the first invention, the inclined angle end of the circulating component can be connected to the thread trajectory separation position of the minimum lead angle screw. And

  The circulating component used in the ball screw according to the ninth invention of the present application is characterized in that, in the first invention, the inclined angle end portion of the circulating component can be connected to the thread trajectory separation position of the maximum lead angle screw. And

The circulating component used in the ball screw provided by the present invention has the following advantages over the prior art.
(1) Simplified standards for circulating parts.
The single circulation component according to the present invention can be applied to a ball screw of many different types. Therefore, it is possible to avoid a problem that the circulating parts are easily mistaken in the conventional ball screw only by performing simple classification.
(2) Improvement of economic effect and profit.
The structure of the integrated circulating component according to the present invention is injection-molded with a single mold, and does not require assembly. At the same time, the number of circulating components can be relatively reduced because the number of circulating components is reduced. . Speaking of mold manufacturing / maintenance and storage, the circulating parts according to the present invention have an effect of cost reduction, and can improve economic effects and profits.

  FIG. 4 shows a circulating component 1 applied to a ball screw provided by the present invention. The circulating component 1 is mainly used on a variety of different types of reed ball screws, and is formed on the circulating component 1. The recess 11 corresponds to the ball and screw trajectory, and the cutting line direction change position 111 and the thread trajectory disengagement position 112 included in the recess 11.

  The sled track disengagement position 112 is in the vicinity of the recess inlet 12, and the recess inlet 12 has a cone shape that gradually decreases from the end face 15 of the circulating component 1 along the tangential change position 111. Present. Further, an upper edge wall surface 13 and a lower edge wall surface 14 that are inclined outward are formed in the recess inlet 12. The upper edge wall surface 13 and the lower edge wall surface 14 are each formed with an inclination angle in the horizontal direction.

  The inclination angle β of the upper edge wall surface 13 is greater than or equal to the minimum lead angle αmin in the common ball screw, and the end of the inclination angle β of the circulating component 1 is the thread of the screw having the minimum lead angle αmin. It can be connected to the orbit departure position 112.

  The inclination angle γ of the lower edge wall surface 14 is smaller than or equal to the maximum lead angle αmax in the common ball screw, respectively. Similarly, the end part of the inclination angle γ of the circulating component 1 also has the maximum lead angle αmax. It can be connected to the thread trajectory separation position 112 of the screw.

  Then, when the rolling part leaves the screw track and reaches the moving position before the cutting direction change, that is, before the rolling part enters the cutting direction change position 111, the rolling part operation is smooth. By maintaining it continuously, it can be applied to ball screws of many different types of leads, and the manufacturing and production standards of the circulating component 1 can be simplified.

  The circulating component 1 is provided corresponding to the return channel in the vicinity of the circulating component 1 formed on the inner edge of the nut.

  A description will be given with reference to FIG. 4 again. A recess 11 is formed on the circulating component 1. Both ends of the recess 11 are connected to the ball screw raceway and the nut circulation passage, respectively. Further, by forming a lead angle between the ball screw raceway corresponding to the recess 11 and the horizontal plane, the rolling component is turned in the circulating component 1 using the recess 11, and the rolling component is circulated in a circulating manner. To complete the action.

The detailed configuration of the present invention will be described with reference to FIGS.
The recess 11 of the circulating component 1 has a recess inlet 12 corresponding to the ball screw trajectory. And the recess 11 is comprised corresponding to the cutting direction change position 111 of a nut circulation flow path, and a ball screw track.

  The recess entrance 12 has an upper edge wall surface 13 and a lower edge wall surface 14 that are inclined outward, and the upper edge wall surface 13 and the lower edge wall surface 14 are projected on a plane as shown in FIG. θ is formed.

  The upper edge wall surface 13 and the lower edge wall surface 14 of the recess inlet 12 have shapes that are not parallel to each other, and the upper edge wall surface 13 and the horizontal direction form an inclination angle β, and the lower edge wall surface 14 is also inclined with respect to the horizontal direction. The angle γ is formed.

  The inclination angle β of the upper edge wall surface 13 is larger than the minimum lead angle αmin that shares the lead angle of the circulating component 1, and the inclination angle γ of the lower edge wall surface 14 shares the lead angle of the circulating component 1. Is smaller than the maximum lead angle αmax.

  Further, the length L of the thread orbit separation position 112 at the recess inlet 12 of the circulating component 1 must satisfy the following inequality.

    L ≦ D ball

L is a horizontal distance from the end face 15 of the circulating component 1 recess inlet 12 to the lower edge wall surface 14 and the recess 11.
D ball is the diameter of the rolling part.

  Since the circulation channel 31 is slightly larger than the diameter of the rolling component, the rolling component is not restrained in the circulation channel 31. On the other hand, the recess inlet 12 further widens the gap. If the gap is too large, it will affect the smoothness of the ball and screw. Therefore, when the length of the recess inlet 12 is L ≦ D ball, the trajectory leaving point 112 and the cutting line direction changing point 111 can be separated and the influence on the smoothness due to the excessive gap can be avoided. By doing so, it is possible to configure a structure that can be applied to the ball and screw circulating component 1 of a variety of different lead and angle standard ball and screw.

  According to the present invention, when the circulating component 1 is actually operated, the ball screw trajectory is designed to be slightly larger at the outermost dimension of the thread trajectory separation position 112 as shown in FIGS. 5 and 6. To do. When the rolling part leaves the raceway position of the ball screw, the rolling part is designed with a conical shape inclined to the outside while giving the rolling part some buffer space and tilting the recess inlet 12 outward. Before entering the recess 11 cutting direction change position 111 of the circulating component 1, the sled track position 112 is first removed.

  Furthermore, after moving along the movement space of the upper edge wall surface 13 or the lower edge wall surface 14, the cutting line angle of the rolling component is changed for the first time. Furthermore, it enters into the recess 11 from the cutting direction change position 111, and further moves to the circulation path of the nut. In this way, the circulation part 1 is provided with the recess inlet 12 that is inclined outward, and can be applied to various types of ball screws having different lead angles. The irregularity can be avoided, the application range of the circulating component 1 can be simplified, the number of molds can be reduced, the cost can be greatly reduced, the production of defective products can be reduced, and the economic efficiency can be effectively improved.

2 is an exploded schematic view of a nut body of a conventional ball screw. 1 is a schematic perspective view of a conventional circulation component. 1 is a schematic plan view of a conventional circulation component. It is a perspective appearance outline figure of circulation component composition form of the present invention. It is a plane side view of the correspondence of the circulation component recess inlet. It is a side schematic diagram of the circulation part actual operation circulation state of the present invention. 2 is a schematic plan view of a recess inlet of a circulation part.

Explanation of symbols

1... Circulating part 11... Recess 111... Cutting line direction change position 112... Thread orbit separation position 12. Wall 14 ··· Lower edge wall 15 ··· End surface 3 ··· Nut body 31 ··· Circulation channel 4 ··· Circulation component 41 ··· Recess 42 ... Recess entrance

Claims (9)

Circulating parts used for ball and screw,
Provided corresponding to the inner edge of the nut, forming a return channel in the vicinity of the circulating component, and forming a recess on the circulating component;
The recess ends are connected to the ball screw raceway and the nut circulation path, respectively.
The recess of the circulation part has a recess inlet corresponding to the ball and screw trajectory,
There is an upper edge wall surface and a lower edge wall surface having an inclination angle at the thread orbit separation position of the recess entrance,
The upper edge wall surface and the lower edge wall surface are not parallel to each other,
The upper edge wall surface is formed with a horizontal direction and an inclination angle β, and the lower edge wall surface is formed with a horizontal direction and an inclination angle γ so that it can be applied to a variety of different lead-standard ball screws. It is characterized by
Circulating parts used for ball screws. 2. The circulating component used for a ball screw according to claim 1, wherein an inclination angle β of the upper edge wall surface is greater than or equal to a minimum lead angle αmin of the shared circulating component. The circulating component used for a ball screw according to claim 1, wherein the inclination angle γ of the upper edge wall surface is smaller than or equal to the maximum lead angle αmax of the shared circulating component. The circulating part used for a ball screw according to claim 1, wherein the upper and lower edge wall surfaces of the recess entrance are formed with a depression angle θ after being projected onto a flat surface. The length of the thread orbit separation position of the recess is:
When the horizontal distance from the end face of the circulation part recess entrance to the place where the lower edge wall surface and the recess intersect is L, and the diameter of the rolling part is D ball,
The circulating part used for a ball screw according to claim 1, wherein L ≦ D ball. 2. The circulating component used in the ball screw according to claim 1, wherein the recess is configured to correspond to a cutting direction change position corresponding to a nut circulation flow path and a ball screw trajectory. The circulating part used for a ball screw according to claim 1, wherein an inclination angle of the recess inlet is an angle inclined outward. The circulating component used for a ball screw according to claim 1, wherein the inclined angle end portion of the circulating component can be connected to a thread orbit separation position of a minimum lead angle screw. The circulating component used for a ball screw according to claim 1, wherein the inclined angle end portion of the circulating component can be connected to a thread orbit separation position of a maximum lead angle screw.

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