TWI487856B - Ball screw with safety structure - Google Patents

Description

Ball screw with safety structure

The invention is a transmission component, in particular a ball screw with a safety structure.

As disclosed in Taiwan Patent No. M314279, a ball screw for mounting a circulation device from a nut end is provided, wherein the circulation device provides a rolling body for circulating recirculation, and the rolling body passes through a curved path when entering and leaving the circulation device. Therefore, when the rolling elements pass through the curved paths, they will hit the wall surface of the circulation device, which may cause the circulation device to rupture. Because the circulation device is formed by plastic injection molding, it is impossible to prevent this problem from occurring. Therefore, There is still a need for improvement in this part.

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 safety structure capable of preventing a circulating device of a plastic material from being broken due to impact of a rolling element.

For the above purpose, a ball screw having a safety structure includes: a plurality of rolling bodies; a long shaft extending in a direction into a long strip structure defining the extending direction as an axial direction, and the outer surface of the long shaft is provided a spiral rolling groove; a nut having a through hole for the long shaft, the inner edge surface of the through hole is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path, and the through hole is further provided Two spaced-apart mounting slots, the nut is further provided with a return hole disposed in an axial direction, the return hole is in communication with the two mounting slots, and the end of the nut is adjacent to the mounting slot and is provided with a C-type a two-circulating device, which is disposed in the mounting groove, and the two circulating devices respectively have a return channel, and one of the two return channels is connected to both ends of the return hole, and the other end of the return channel is coupled to the load path The two ends are connected to form a circulation path, and the circulation path provides the rolling body arrangement. After the installation device is installed in the installation groove, the circulation device has an outer end surface disposed opposite to the axial direction, and the outer end surface is adjacent to the return hole. The two blocking members are mounted on the C-shaped groove, and the blocking member has an inner side surface disposed opposite to the outer end surface, and the inner side surface and the outer end surface are disposed at a gap. And the inner side is also opposite Return hole is provided, the concept of the normal direction of the return holes, the inner surface of the shield system return hole to at least one-half of the entire cross-sectional area.

Preferably, the blocking member has a shielding protrusion that shields the entire cross-sectional area of the return hole and the outer end surface.

Preferably, the blocking member is respectively provided with an auxiliary convex portion at both ends of the C-shape, and the auxiliary convex portion is received in the rolling groove.

Preferably, the two ends of the C-shaped portion of the blocking member are respectively provided with an auxiliary convex portion, and the auxiliary convex portion is received in the rolling groove.

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. .

(1) ‧ ‧ long axis

(11) ‧ ‧ rolling groove

(2)‧‧‧ Nuts

(21)‧‧‧Perforation

(211)‧‧‧ rolling trough

(22)‧‧‧Installation slot

(23)‧‧‧C slot

(24) ‧‧‧Return holes

(3) ‧ ‧ Circulation device

(31) ‧‧‧ Return Road

(32) ‧‧‧Outer end face

(4) ‧‧‧blocking parts

(41) ‧‧‧Auxiliary convex

(42) ‧‧‧ inside

(43) ‧‧‧shading convex

(5) ‧ ‧ rolling elements

(6) ‧‧‧ cushioning parts

(X)‧‧‧Axis direction

(F) ‧ ‧ gap

(90)‧‧‧Load path

The first figure is a system diagram of a ball screw having a safety structure according to a first preferred embodiment of the present invention.

The second drawing is a combination view of a ball screw having a safety structure according to a first preferred embodiment of the present invention.

Fig. 3 is a cross-sectional view showing the axial direction of a ball screw having a safety structure according to a first preferred embodiment of the present invention.

The fourth drawing is an end view of a ball screw having a safety structure according to a first preferred embodiment of the present invention.

Figure 5 is a perspective view of a blocking member in accordance with a second preferred embodiment of the present invention.

Figure 6 is a cross-sectional view showing the axial direction of a ball screw having a safety structure according to a second preferred embodiment of the present invention.

Figure 7 is a perspective view of a blocking member in accordance with a third preferred embodiment of the present invention.

Figure 8 is an end elevational view of a ball screw having a safety structure in accordance with a third preferred embodiment of the present invention.

The following is a detailed description of the components and the functions of the present invention, and the following is a brief description of the following: The first figure is a safety structure of the first preferred embodiment of the present invention. System diagram of the ball screw.

The second drawing is a combination view of a ball screw having a safety structure according to a first preferred embodiment of the present invention.

Fig. 3 is a cross-sectional view showing the axial direction of a ball screw having a safety structure according to a first preferred embodiment of the present invention.

The fourth figure is a ball screw with a safety structure according to a first preferred embodiment of the present invention. End view.

Figure 5 is a perspective view of a blocking member in accordance with a second preferred embodiment of the present invention.

Figure 6 is a cross-sectional view showing the axial direction of a ball screw having a safety structure according to a second preferred embodiment of the present invention.

Figure 7 is a perspective view of a blocking member in accordance with a third preferred embodiment of the present invention.

Figure 8 is an end elevational view of a ball screw having a safety structure in accordance with a third preferred embodiment of the present invention.

Referring to the first to fourth figures, which are diagrams of a first preferred embodiment of the present invention, the present invention is a ball screw having a safety structure, comprising: a plurality of rolling elements (5); a shaft (1) extending in a direction into an elongated structure defining the direction of the axis as an axial direction (X), the outer surface of the long axis (1) being 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), and the through hole (21) is further provided with two spaced mounting grooves (22), and the nut (2) is further provided with an axial direction (X) a return hole (24), the return hole (24) is in communication with the two mounting slots (22), and an end of the nut (2) and adjacent to the mounting slot (22) is provided with a C-type a groove (23); a two-cycle device (3) disposed in the mounting groove (22). In the embodiment, the circulation device (3) is locked to the installation groove by a screw (not shown), and the circulation device (3) ) respectively having a return channel (31), one of the two ends of the return channel (31) and the reflow Ends (24) of the adapter, the other two of the return path (31) The end system is coupled to both ends of the load path (90) to form a circulation path, the circulation path is provided to provide the rolling body (5), and the circulation device (3) is mounted on the installation groove (22), having An outer end surface (32) is disposed in a direction opposite to the axial direction (X), and the outer end surface (32) is disposed substantially in a normal direction with the return hole (24); and two blocking members (4) are installed in a C-type structure In the C-shaped groove (23), the blocking member (4) is made of a metal material, and the blocking member (4) has an inner side surface (42) disposed opposite the outer end surface (32), the inner side surface (42) Maintaining a gap (F) with the outer end surface (32), when the rolling body (5) is running, the rolling path of the rolling body (5) flowing through the return passage (31) is bound to cause an impact, and the cycle is caused. The device (3) vibrates, assuming that there is no such setting of the gap (F), the circulation device (3) transmits vibration to the blocking member (4), and the blocking member (4) of course also follows a slight vibration, that is, Another type of abnormal sound is generated, so the blocking member (4) of the present invention does not have the effect of fixing the circulation device (3), and the inner side surface (42) is also disposed opposite to the return hole (24), and the return hole (24) Normal In the direction of view, the inner side surface (42) shields the cross-sectional area of the return hole (24) by at least one-half, as shown in the fourth figure. In addition, in order to increase the impact resistance of the blocking member (4), in the embodiment, an auxiliary convex portion (41) is respectively disposed at both ends of the C-shaped portion of the blocking member (4), and the auxiliary convex portion (41) is It is accommodated in the rolling groove (11), thereby preventing the blocking member (4) from being separated from the C-shaped groove (23) because the axial direction (X) restraining force is too small. Therefore, by the arrangement of the blocking member (4), the rolling element (5) can be prevented from being broken due to abnormally severe or long-term impact on the circulation device (3), thereby causing the circulation device (3) to be broken. The blocking member (4) is arranged to prevent the rolling element (5) from falling out of the axial direction (X) of the return hole (24), so as to avoid the mounting of the ball The platform of the vertical mechanism of the screw is slid by its own weight due to the loss of the rolling element, thereby causing damage to the equipment or causing personal injury.

Referring to the fifth to sixth embodiments, which are diagrams of a second preferred embodiment of the present invention, the preferred embodiment differs from the first preferred embodiment in that the blocking member (4) is facing away from each other. The outer side surface of the inner side surface (42) is provided with a cushioning member (6). The cushioning member (6) is made of a soft material such as plastic or rubber, and the buffering member (6) is mainly used for absorbing the rolling body. (5) impacting the impact force of the blocking member (4), the degree of damage of the blocking member (4) is lowered, and the impact resistance of the blocking member (4) is raised. The structure and configuration of the remaining components are the same as those of the first preferred embodiment, and will not be further described herein.

Finally, please refer to the seventh to eighth embodiments, which are diagrams of a third preferred embodiment of the present invention. The preferred embodiment differs from the first preferred embodiment in that the blocking member (4) has a a shielding protrusion (43) shielding the entire cross-sectional area of the return hole (24) and the outer end surface (32), so as to prevent the rolling element (5) from falling out The ability of the nut. The structure and configuration of the remaining components are the same as those of the first preferred embodiment, and will not be further described herein.

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. The use of 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 "novelty" and "progressiveness" of the present invention are in compliance with the patent regulations, and the application for the invention patent is filed according to law. Please give us a review and grant a patent as soon as possible.

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)‧‧‧Installation slot

(23)‧‧‧C slot

(3) ‧ ‧ Circulation device

(31) ‧‧‧ Return Road

(32) ‧‧‧Outer end face

(4) ‧‧‧blocking parts

(42) ‧‧‧ inside

(5) ‧ ‧ rolling elements

(X)‧‧‧Axis direction

Claims (3)

A ball screw with a safety structure includes: a plurality of rolling bodies; a long shaft extending in a direction into a long strip structure defining the extending direction as an axial direction, and the outer surface of the long shaft is provided with a spiral rolling groove a nut having a perforation for the long shaft, the inner edge surface of the perforation being provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove forming a load path, and the perforation is further provided There are two spaced-apart mounting slots, and the nut is further provided with a return hole disposed in an axial direction, the return hole is in communication with the two mounting slots, and an end of the nut and adjacent to the mounting slot is provided with a C a two-circulation device, which is disposed in the mounting groove, and the two circulating devices respectively have a return channel, and one of the two return channels is connected to both ends of the return hole, and the other end of the return channel is coupled to the load The two ends of the path are connected to form a circulation path, and the circulation path provides the rolling body arrangement. After the installation device is installed in the installation groove, the circulation device has an outer end surface disposed opposite to the axial direction, and the outer end surface is connected to the return hole. Approximate normal a two-blocking member, wherein the C-shaped structure is mounted on the C-shaped groove, the blocking member has an inner side surface disposed opposite to the outer end surface, the inner side surface and the outer end surface are disposed with a gap, and the inner portion The side surface is also disposed opposite to the return hole, and the inner side surface shields at least one-half to all of the cross-sectional area of the return hole by the normal direction of the return hole, and the blocking member has a shielding protrusion, the shielding The convex portion shields the entire cross-sectional area of the return hole and the outer end surface. The ball screw with a safety structure according to claim 1, wherein the blocking member is respectively provided with an auxiliary convex portion at both ends of the C-shape, and the auxiliary convex portion is received in the rolling groove. A ball screw having a safety structure according to claim 1, wherein the blocking member is provided with a cushioning member on a side opposite to the inner side.