CN113374846B - Auxiliary device for return elbow and ball screw using the same - Google Patents

Abstract

The invention discloses a backflow pipe bending assistor and a ball screw applying the backflow pipe bending assistor, the backflow pipe bending assistor mainly comprises a top surface, a bottom end and a peripheral wall, the peripheral wall is in a vertical wall surface shape relative to a radial base line defined by a screw cap, an arc surface is formed on one side of the bottom end, a downward extending inclined pipe jack is formed on the top surface, the inclined pipe jack is in an inclined angle downward extending shape relative to the radial base line, one part of the lower end of the inclined pipe jack penetrates out to form a penetrating opening, the other part of the lower end of the inclined pipe jack and the bottom end have a spacing wall thickness to form a stopping end wall, and an embedding part is also formed on the stopping end wall; and a connecting surface is formed on the inner side of the wall thickness of the spacing wall, and the inner diameter of the connecting surface is smaller than that of the jack of the inclined pipe.

Description

Auxiliary device for return elbow and ball screw using the same

technical field

The present invention relates to a ball screw; in particular, it refers to a structure of a backflow elbow auxiliary device of the ball screw.

Background technique

In the structural design of the ball screw, the part related to the recirculation of the ball has always been one of the key breakthroughs developed for the related industry.

According to the current relevant prior art data, the forms of ball recirculation are mainly divided into two types: external circulation type and internal circulation type, and the present invention is especially discussed for the external circulation type structure, and then the external circulation type is discussed. As far as the structure is concerned, it mainly guides and displaces several rollers (balls or rollers) from one place of the nut to another place through a return pipe.

The constituent elements of the return pipe described in the previous paragraph usually include the pipe body and the two-leg base, and as far as the existing specific implementation forms of the pipe body and the two-leg base are concerned, they are roughly divided into two types: one-piece type and split type. Each form has its own advantages and disadvantages. Take the one-piece form as an example, usually plastic materials are used for injection molding. Although the components are the most streamlined, the longer the tube size, the higher the probability of bending deformation of the finished product. Therefore, for The structural conditions of some ball screws are not suitable; take the split structure form as an example, usually the elbow section of the tube body is inserted into the foot seat at a vertical angle, and the extension direction of the tube body is set in line with the screw. The extension axes of the nut are obliquely staggered to each other, so that there are still some problems and disadvantages in its application, such as the exposed volume of the tube body is too large, the stability of the combination of the tube body and the foot seat is not good, and the processing is not easy. (For example, multi-axis machining is required) and the smoothness of the connection of the return channel is not good, etc. The present invention is an innovative breakthrough especially for such a split ball screw return structure.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a return elbow auxiliary device and a ball screw using the same.

To achieve the above object, the present invention adopts the following technical solutions:

A return elbow auxiliary device includes a top surface, a bottom end and a peripheral wall, the peripheral wall is in the form of a vertical wall surface relative to a radial base line defined by a nut, and an arc surface is formed on one side of the bottom end. The surface includes an ascending end and a descending end, the descending end is connected with the bottom end, a lip is protruded downward from the arc-shaped surface adjacent to the ascending end, the lip is formed with a supporting portion, and the top surface forms a downwardly extending oblique pipe socket , the oblique tube socket extends downward at an inclined angle relative to the radial base line, and a part of the lower end of the oblique tube socket penetrates the area between the lip and the descending end, thereby defining a perforation, The other part of the lower end of the slanted tube insertion hole and the bottom end maintain a partition wall thickness, so as to define and form a stop end wall, and the stop end wall is formed with an inserting part; and the inner side of the partition wall thickness is formed A connecting surface makes the inner diameter difference of the ball return channel reach a smooth connection state, the inner diameter of the connecting surface is smaller than the inner diameter of the inclined pipe jack, and the connecting surface has an inner port and an outer port, and the inner port is connected with the stop end wall.

A ball screw includes a screw, a nut for screwing the screw, a plurality of balls, a return elbow and the aforementioned return elbow auxiliary; wherein the nut extends along a central axis to define and form two ends and a An outer wall defines a radial base line and the central axis which are on the same plane and orthogonal to each other according to the central axis; a screw hole is formed in the nut penetrating the two ends, and the outer wall is provided with a communicating screw hole along the center The axes are arranged in pairs and spaced apart from two installation grooves, and the peripheral side of each installation groove forms a groove wall; the return elbow includes a spanning section and two oblique bends formed at opposite ends of the spanning section Each obliquely curved segment is in the form of extending obliquely toward the sideward bending relative to the spanning segment, and the inclination directions of the two obliquely curved segments are opposite to each other, and each obliquely curved segment is formed with a nozzle end; The curved section is inserted into the oblique pipe insertion hole of the return elbow auxiliary device, the pipe mouth end abuts against the stop end wall of the lower end of the inclined pipe insertion hole, and the pipe mouth end is formed with an insertion part to be inserted and fitted in the inclined pipe insertion hole. The inserting part formed by the end wall of the stopper is used to insert the return elbow auxiliary device into the corresponding installation groove set on the outer side of the nut, and make the installation angle of the groove wall of the installation groove perpendicular to the diameter. The inner diameter of the non-loading section defined between the inner port of the connecting surface and the corresponding thread groove is larger than the outer port of the connecting surface and the corresponding The inner diameter of the formed load section is defined between the threaded grooves.

The effects and advantages of the present invention mainly include the following points:

1. The return elbow can be made by bending metal pipes with equal wall thickness, thereby reducing the manufacturing cost;

2. The return elbow auxiliary device is in-line form, so that the return elbow does not need to be set into two sections, the number of components is reduced, so the manufacturing cost can be reduced;

3. It makes the machining of the grooves for the installation of the nut easier, and only needs to be made by a straight-axis tool, without the use of a four-axis processing machine, and the processing cost and defect rate can be reduced;

4. Whether it is a metal or plastic return elbow, it can be used in the same structure and type of nut to reduce the different types of nuts of the same specification, thereby reducing inventory management and storage costs;

5. Make the vertical bending section of the return elbow obliquely connected with the ball runner of the screw nut to reduce the operating noise and vibration, and the exposed volume of the return elbow can be minimized, which is more conducive to the miniaturization of the structure. development trend;

6. The inner diameter difference that must exist between the load section and the non-load section of the ball return channel can achieve a smooth connection state, so that the ball return state is smooth and free from jumping.

7. Through the shape of the return elbow auxiliary device being in-line and the vertical bending section of the return elbow being obliquely inserted into the return elbow auxiliary device, it can be stabilized at the same time by using the assembled state of the fixed auxiliary device. Locate the return elbow.

Description of drawings

FIG. 1 is a top-view perspective view of a preferred embodiment of the backflow elbow assistant of the present invention;

FIG. 2 is a bottom-view perspective view of a preferred embodiment of the backflow elbow assistant of the present invention;

FIG. 3 is a top view of a preferred embodiment of the return elbow auxiliary device of the present invention;

Fig. 4 is a sectional view of 4-4 of Fig. 3;

5 is a combined perspective view of a preferred embodiment of the ball screw of the present invention;

Figure 6 is a top view of a preferred embodiment of the ball screw of the present invention (Note: the pressing member is removed in this figure);

7 is an exploded perspective view of a preferred embodiment of the ball screw of the present invention;

FIG. 8 is a sectional view of 8-8 of FIG. 6;

FIG. 9 is a partial enlarged view of FIG. 8;

FIG. 10 is an enlarged cross-sectional view of a partial structure of the present invention.

Detailed ways

Please refer to FIG. 1 to FIG. 9 , the preferred embodiments of the backflow elbow assistant and the ball screw applying the same according to the present invention, but these embodiments are for illustrative purposes only, and are not subject to this structure in the patent application. limit.

The return elbow auxiliary device 50 is used for a mounting groove 24 set on the outer side of a nut 20 of a ball screw 100 to be combined with a return elbow 40 to form a ball return channel; the return elbow The tube assistant 50 includes a top surface 51, a bottom end 52 and a peripheral wall 53. The peripheral wall 53 is in the form of a vertical wall surface relative to a radial base line L2 defined by the nut 20, and an arc is formed on one side of the bottom end 52. Surface 54, the arc-shaped surface 54 includes a rising end 541 and a lowering end 542, the lowering end 542 is connected with the bottom end 52, and the arc-shaped surface 54 protrudes downward adjacent to the rising end 541 to form a lip 55, and the lip 55 forms There is a support portion 551 (note: used to support the local position of the return elbow 40), the top surface 51 forms an inclined pipe insertion hole 56 extending downward, and the inclined pipe insertion hole 56 is inclined relative to the radial base line L2. The downward extension form, and part of the lower end of the oblique tube insertion hole 56 passes through the area between the lip 55 and the descending end 542, thereby defining a through hole 561, and the lower end of the inclined tube insertion hole 56 is formed. A partition wall thickness H1 (shown only in FIG. 2 ) is maintained between the other part and the bottom end 52 , so as to define and form a stop end wall 562 , and the stop end wall 562 forms an inserting portion 563 ; the partition wall A connecting surface 57 (Connecting surface) is formed on the inner side of the thickness H1 to make the inner diameter difference of the ball return channel reach a smooth connection state (note: this effect will be described in detail later). The connecting surface 57 has an inner port 571 and an outer port 572 , and the inner port 571 is connected with the stop end wall 562 .

As shown in FIG. 4 , in this example, the vertical cross-sectional surface of the inserting portion 563 is tapered into a triangular shape in the oblique downward direction.

As shown in FIG. 1 and FIG. 3 , in this example, the top surface 51 is also formed with two clamping grooves 58 arranged at intervals; the clamping grooves 58 shown in this example are mainly to facilitate the operator to clamp with a clamp Apply force, so as to achieve the purpose of facilitating the disassembly and assembly of the return elbow auxiliary device 50 .

As shown in FIG. 5 to FIG. 9, the present invention further provides a ball screw 100. The ball screw 100 includes a screw 10 having a thread groove 11, a nut 20 for screwing the screw 10, a plurality of balls 30, at least one The return elbow 40 and the return elbow auxiliary 50 shown in the aforementioned FIG. 1 to FIG. 4; wherein, the nut 20 is extended along a central axis L1 to define and form two end portions 21 and an outer wall 22, and according to the center The axis L1 also defines a radial base line L2 and the central axis L1 which are orthogonal to each other on the same plane; a screw hole 23 is formed in the nut 20 through the two ends 21, and the outer wall 22 is provided with a connecting screw hole 23 and along the nut 20. The two installation grooves 24 are arranged in pairs at intervals along the central axis L1, and a groove wall 241 is formed on the peripheral side of each installation groove 24; The two obliquely curved segments 42 at opposite ends of the segment 41, each obliquely curved segment 42 is in the form of extending obliquely toward the sideward bending relative to the spanning segment 41, and the inclination directions of the two obliquely curved segments 42 are opposite to each other (such as a Left and right), and each oblique bending section 42 forms a nozzle end 43; the oblique bending section 42 is inserted into the oblique pipe insertion hole 56 of the return elbow auxiliary device 50, and the nozzle end 43 abuts against the oblique pipe hole 56. To the stop end wall 562 at the lower end of the pipe insertion hole 56, and the pipe mouth end 43 is formed with an insertion part 433 to be inserted and fitted with the insertion part 563 formed by the stop end wall 562, and then the return pipe bend assistant 50 is connected. It is embedded in the corresponding installation groove 24 set on the outer side of the nut 20, and as shown in FIG. 8, the groove wall 241 of the installation groove 24 is set at an angle (as indicated by the virtual line L3 in FIG. angle) is perpendicular to the radial base line L2, and constitutes the cross section 41 of the return elbow 40 parallel to the central axis L1 (as shown in FIG. 6), and constitutes the inner port 571 of the connecting surface 57 and the corresponding thread groove The inner diameter R1 of the non-loading section defined between 11 is larger than the inner diameter R2 of the loading section defined between the outer port 572 of the connecting surface 57 and the corresponding thread groove 11 .

As shown in FIG. 7 , in this example, the outer wall 22 of the nut 20 further forms a connecting groove 25 between the two installation grooves 24 for supplying part of the cross section 41 of the return elbow 40 to sink. Please refer to FIG. 8 for the advantages of the embodiment shown in this example, the exposed height of the spanning section 41 can be reduced, thereby reducing the exposed volume of the ball return channel components, and facilitating the miniaturization design and development trend of products.

The top surface 51 of the return elbow auxiliary device 50 has a protruding height relative to the surface of the outer wall 22 of the nut 20 (note: the drawing is omitted, specifically about 0.05mm), which is further pressed by a pressing member 60; In this example, the pressing member 60 can be specifically shown in FIG. 7 and FIG. 8 , and it can be, but not limited to, a rigid plate shape that is locked and positioned by bolts. The tightness of the positioning state of the tube aid 50 .

As shown in detail in FIG. 9 , the inserting portion 563 and the inserting portion 433 that are inserted and fitted with each other have a vertical cross-section of a concave and convex shape of a triangle. The advantages of the inserting form shown in this example are: It is to make the positioning state of the obliquely curved section 42 of the return elbow 40, in addition to the abutting effect, also add the conical insert effect of the triangular concave-convex surface matching, so that the obliquely curved section of the return elbow 40 is added. 42 has better anti-drop positioning effect.

Based on the above-mentioned structure and technical features, please refer to FIG. 7 when installing the return elbow auxiliary device 50 of the present invention. Then, insert each return bend auxiliary device 50 downward into the installation groove 24 set on the outer wall 22 of the nut 20, and then perform the locking of the pressing member 60, that is, the return bend is completed. The installation and positioning of the tube assistant 50 (as shown in FIG. 5 ). The present invention belongs to a split-type screw ball return form. Based on this form, the return elbow 40 becomes an independent component, so it can be manufactured by bending a metal pipe of equal wall thickness, thereby reducing the manufacturing cost; and Whether it is a return elbow made of metal or plastic material, it can be used for the same structure type of nut, reducing the different types of nuts of the same specification, thereby reducing inventory management and storage costs. Furthermore, since the return elbow auxiliary device 50 is in the form of in-line insertion, the return elbow 40 does not need to be formed in two sections, so the number of components can be reduced and the manufacturing cost can be reduced. And through the technical feature that the groove wall 241 of the installation groove 24 is set at an angle (the angle shown by the virtual line L3 in FIG. 8 ) perpendicular to the radial base line L2, the installation groove 24 of the nut 20 can be processed. It is simpler and can be made only by a straight-axis tool, without using a more expensive four-axis processing machine, so the processing cost and defect rate can be greatly reduced. In addition, due to the morphological feature that each obliquely bent section 42 is bent and extended in a lateral direction relative to the cross section 41, the vertical bent section of the return elbow 40 is inclined to the ball flow channel of the nut 20. It can be connected directly and smoothly to reduce operating noise and vibration, and the exposed volume of the return elbow can be minimized (Note: Compared with the right-angle bending form of the conventional ㄇ-shaped return elbow), it is more conducive to the development of miniaturized structures trend. On the other hand, because the return elbow assistant 50 is in the form of straight insertion, and the oblique bending section 42 of the return elbow 40 is obliquely inserted into the integrated shape of the return elbow assistant 50, the return elbow is used to assist In the assembled state of the device 50, the return elbow 40 can be stably positioned at the same time.

In addition, through the technical characteristics of the connecting surface 57, the inner diameter difference that must exist between the loaded section and the non-loaded section of the ball return channel can achieve a smooth connection state, so that the ball return state is smooth without the risk of jumping. It should be further explained that the aforementioned "load section" is the ball return channel section defined between the screw hole 23 of the nut 20 and the screw 10, and this section needs to bear a large load, so this section is different from A small fit gap will be reserved between the balls 30 to obtain a more stable actuation state, and the “non-load section” refers to the ball return channel included in the return elbow auxiliary 50 and the return elbow 40 . section, this section does not directly bear the load, so the matching clearance reserved between this section and the ball 30 is relatively large; as shown in Figure 10, R1 is the inner diameter of the non-loaded section, and R2 is the loaded section The inner diameter, so R2<R1, is the optimal shape design of the ball return channel. Based on this, the aforementioned technical features can easily meet this functional requirement, and can be achieved by pre-planning the forming mold of the return elbow assistant 50; of course, This is the effect that can be achieved based on the innovative and unique structural form of the present invention.

On the other hand, the configuration features of the cross section 41 of the return elbow 40 in the present invention are parallel to the central axis L1 of the nut 20 (as shown in FIG. 6 ), the main advantage is that the minimum outer diameter of the nut 20 is There is room for further reduction in the design, because the existing return elbow is usually in an oblique extension configuration with respect to the central axis of the nut. It is directly limited by the minimum outer diameter of the ball screw, and in order to consider that the two bent ends can be smoothly connected with the ball channel formed by the external thread of the screw, the wall thickness of the nut must be thickened to meet the requirements. The technical features can indeed solve this problem.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (6)

1. A backflow elbow auxiliary device is used to provide a mounting groove set on the outside of a nut of a ball screw, so as to be combined with a backflow elbow to form a ball backflow channel; it is characterized by: The return elbow auxiliary device includes a top surface, a bottom end and a peripheral wall, the peripheral wall is in the form of a vertical wall surface relative to a radial base line defined by the nut, and an arc surface is formed on one side of the bottom end. The shape surface includes an ascending end and a descending end, the descending end is connected with the bottom end, a lip is protruded downward on the arc-shaped surface adjacent to the ascending end, and an oblique pipe insertion hole extending downward is formed on the top surface. The tube insertion hole extends downward at an oblique angle relative to the radial base line, and a part of the lower end of the inclined tube insertion hole passes through the area between the lip and the descending end, so as to define and form a perforation, while the inclined tube insertion hole is formed. The other part of the lower end of the socket hole and the bottom end maintain a partition wall thickness, so as to define and form a stop end wall, and the stop end wall is formed with an inserting part; the inner side of the partition wall forms a connecting surface to The inner diameter difference of the ball return channel is made to reach a smooth connection state, the inner diameter of the connection surface is smaller than the inner diameter of the inclined pipe jack, and the connection surface has an inner port and an outer port, and the inner port is connected with the stop end wall. 2 . The backflow elbow auxiliary device according to claim 1 , wherein the vertical section of the inserting portion is tapered into a triangular shape in the oblique downward direction. 3 . 3 . The backflow elbow auxiliary device according to claim 1 , wherein two clamping grooves arranged at intervals are further formed on the top surface. 4 . 4. A ball screw, characterized by comprising a screw with a thread groove, a nut for screwing the screw, a plurality of balls, at least one return elbow and two as claimed in any one of claims 1 to 3. The backflow elbow auxiliary device; wherein, the nut extends along a central axis to define and form two ends and an outer wall, and according to the central axis, a radial base line and the central axis are also defined in the same plane and orthogonal to each other; A screw hole is formed in the nut passing through the two ends, and the outer wall is provided with two installation grooves which are connected with the screw holes and are arranged in pairs along the central axis, and a groove is formed on the peripheral side of each installation groove. wall; at least one return elbow includes a spanning section and two obliquely curved sections formed at opposite ends of the spanning section, each obliquely curved section extending obliquely toward the sideways relative to the spanning section shape, and the inclination directions of the two oblique bending sections are opposite to each other, and each oblique bending section is formed with a nozzle end; The end abuts against the stop end wall at the lower end of the inclined pipe insertion hole, and the pipe mouth end is formed with an inserting part to be inserted and fitted with the inserting part formed by the stop end wall, and then at least one return elbow auxiliary device is formed. It is embedded in the corresponding installation groove set on the outer side of the nut, and the installation angle of the groove wall of the installation groove is perpendicular to the radial base line, and the spanning section of at least one return elbow is parallel to the The central axis, which constitutes the inner diameter of a non-loading section defined between the inner port of the connection surface and the corresponding thread groove, is greater than the inner diameter of a load section defined between the outer port of the connection surface and the corresponding thread groove , so that the inner diameter difference of the ball return channel can reach a smooth connection state. 5 . The ball screw according to claim 4 , wherein the top surface of the return elbow auxiliary device has a protruding height relative to the outer wall surface of the nut, which is further pressed by a pressing member. 6 . 6 . The ball screw according to claim 4 , wherein the inserting portion and the inserting portion are inserted and fitted with each other, and the vertical cross-section of the ball screw is in the form of a triangular concave and convex inserting and fitting shape. 7 .

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