CN217874033U - Axially supported ball screw - Google Patents

Abstract

The utility model discloses an axially supported ball screw, which comprises a screw rod, a nut sleeved on the screw rod, and a steel ball arranged between the screw rod and the nut. A limiter with a taper is arranged coaxially, and the limiter is arranged with one end large and the other end small, and the large end faces the nut, and the small end faces the driving device; a push plate is also arranged on the screw rod corresponding to the position of the limiter. The push plate and the nut are set coaxially, and are sleeved on the limiter, and the limiter and the screw are integrally formed; the end of the corresponding limiter of the screw is also provided with a needle roller thrust bearing, and the needle roller thrust bearing is coaxially sleeved It is on the screw rod and attached to the push plate to form a supporting force on the push plate and share the axial force of the screw rod; the push plate and the limiter are located between the needle roller thrust bearing and the nut. The utility model can better support the axial direction of the screw rod, and has better axial force transmission effect.

Description

Axially supported ball screw

technical field

The utility model relates to the field of ball screw, in particular to an axially supported ball screw.

Background technique

Ball screw is composed of screw, nut, steel ball, preloader and reverser. It is the most commonly used transmission element in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or convert torque Repeated axial force, at the same time has the characteristics of high precision, reversibility and high efficiency. Due to its small frictional resistance, ball screws are widely used in various industrial equipment and precision instruments.

Generally speaking, the screw is a rotating part, and the nut is set on the screw, the part that slides when the screw rotates, and is connected with the part that needs position adjustment, and the steel ball is set between the nut and the screw to roll, to reduce friction. When the screw drives the nut to move, it will inevitably exert force on the axial direction of the screw, and as the weight of the parts connected by the nut increases, the force will also increase. In order to ensure that the screw can work stably, it is also necessary to be able to Better support for the screw.

Utility model content

In view of the deficiencies in the prior art, the purpose of the utility model is to provide an axially supported ball screw, which can better support the axial direction of the screw and has a better axial force transmission effect.

In order to achieve the above purpose, the utility model provides the following technical solutions: an axially supported ball screw, including a screw, a nut sleeved on the screw, and a steel ball arranged between the screw and the nut, the screw on which Close to the end for connecting to the external driving device, there is a conical limit piece coaxially arranged, the limit piece is arranged in such a way that one end is large and the other end is small, and the large end faces the nut, and the small end faces the drive device; The position of the limiter should also be provided with a push plate, the push plate is coaxially arranged with the nut, and sleeved on the limiter, the limiter and the screw are integrally formed; the end of the corresponding limiter of the screw rod The part is also provided with a needle roller thrust bearing, which is coaxially sleeved on the screw rod and attached to the push plate to form a supporting force for the push plate and share the axial force of the screw rod; the push plate and The limit piece is located between the needle roller thrust bearing and the nut.

As a further improvement of the utility model, a first block is provided on the nut corresponding to one end of the push plate, and a second block is provided at a position corresponding to the first block on the push plate, and the first block and The rotation of the nut is limited by abutment between the second clamping blocks; the limiting member is in the shape of a polygonal platform, and the shape of the connection between the push plate and the limiting member is adapted to form a circumferential rotation limit.

As a further improvement of the utility model, an internal spline is provided at one end of the screw connected to the external driving device, and is connected to the driving device through the internal spline.

As a further improvement of the utility model, the raceway formed by the screw and the nut for the rolling of the steel ball is a four-point contact ball structure.

As a further improvement of the utility model, several spherical protrusions are uniformly arranged on the side of the limiting member.

Beneficial effects of the utility model: the limiter with taper can transmit the axial force to the push plate by using the slope surface of the limiter, and use the push plate to transmit the axial force to the needle roller thrust bearing, because the needle roller thrust bearing has Very strong axial load capacity, so it can have a very good offset effect on the axial force of the screw. Using the slope to transmit the axial force can make the transmission of the axial force more accurate to the needle roller thrust bearing.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the present utility model;

Fig. 2 is the nut structural representation of the present utility model;

Fig. 3 is a structural schematic diagram of a needle roller thrust bearing and a push plate of the present invention;

Fig. 4 is a schematic diagram of the nut structure of the present invention.

Reference numerals: 1, screw; 2, nut; 21, first block; 4, limit piece; 5, push plate; 51, second block; 6, needle roller thrust bearing; 7, internal spline; 8. Spherical bump.

Detailed ways

The utility model will be described in further detail below in conjunction with the embodiments provided by the accompanying drawings.

Referring to Figure 1-4,

An axially supported ball screw, including a screw 1, a nut 2 sleeved on the screw 1, and a steel ball arranged between the screw 1 and the nut 2, the screw 1 is close to it for connecting an external drive device The end of the end is coaxially provided with a limiter 4 with a taper, the limiter 4 is arranged with one end large and the other end small, and the large end faces the nut 2, and the small end faces the driving device; the screw rod 1 corresponds to the limiter The position of 4 is also provided with push plate 5, and this push plate 5 is arranged coaxially with nut 2, and is sleeved on the limit piece 4, and described limit piece 4 and screw rod 1 integrally formed; The corresponding limit of described screw rod 1 The end of the position member 4 is also provided with a needle roller thrust bearing 6, which is coaxially sleeved on the screw rod 1, and fits with the push plate 5 to form a supporting force for the push plate 5 and share the screw rod. The axial force of 1; the push plate 5 and the stopper 4 are located between the needle roller thrust bearing 6 and the nut 2 .

Although the reverser is not specifically described in this scheme, those skilled in the art know that the reverser is arranged on the nut 2 and rolling the steel ball is to realize the end-to-end circulation of the steel ball. This scheme will combine it Insert nut 2 instead of specifically explaining it in detail, and this solution does not modify the inverter, so it does not go into details.

In this solution, when the screw 1 is subjected to an axial force, the axial force can be transmitted to the push plate 5 by using the slope surface of the limit piece 4 through the limit piece 4 with a taper, and the axial force can be transmitted by the push plate 5 For the needle roller thrust bearing 6, since the needle roller thrust bearing 6 has a very strong axial load capacity, it can very well offset the axial force of the screw 1 to achieve the effect of axial support. 4 to transmit the axial force, so that the transmission of the axial force can be more accurately transmitted to the needle roller thrust bearing 6.

Wherein the needle roller thrust bearing 6 can be abutted on the external drive device housing, this abutment can also limit the maximum axial displacement of the screw rod 1, and prevent the screw rod 1 from generating excessive axial force on the drive shaft of the drive device damage.

In further optimization, one end of the nut 2 corresponding to the push plate 5 is provided with a first block 21, and the position of the push plate 5 corresponding to the first block 21 is provided with a second block 51, and the first block 51 The rotation between the block 21 and the second clamping block 51 is limited by abutting against the nut 2; the stopper 4 is in the shape of a polygonal platform, and the shape of the connection between the push plate 5 and the stopper 4 is adapted to form a Circumferential rotation limit.

The push plate 5 itself can transmit the axial force, and the polygonal truss-shaped stopper 4 can cooperate with the push plate 5 to limit the circumferential rotation of the push plate 5, so as to prevent the push plate 5 from slipping in the circumferential direction. At this time, the second block 51 on the push plate 5 can cooperate with the first block 21 to limit the nut 2 in the circumferential direction, that is, after the nut 2 moves to a position close to the push plate 5, the first block 21 can be aligned with the second block. The two clamping blocks 51 cooperate to restrict the nut 2 from continuing to rotate, thereby protecting each component from violent damage.

Based on this optimization, this solution enables the limiting member 4 and the push plate 5 to realize the transmission of axial force and the limitation of circumferential rotation.

In order to facilitate the linkage connection with the driving device, the end of the screw 1 connected to the external driving device is provided with an internal spline 7, and is connected to the driving device through the internal spline 7. The setting of the inner spline 7 can realize the linkage of rotation when the driving device is plugged in, and the installation is more convenient and practical.

In addition, the raceway formed by the screw 1 and the nut 2 for the rolling of steel balls is a four-point contact ball structure. The contact structure can transmit axial force and axial displacement better and more accurately.

In a further optimization, several spherical protrusions 8 are uniformly arranged on the side of the limiting member 4 .

Since the push plate 5 is assembled with the limiter 4, the spherical protrusion 8 on the limiter 4 can be assembled with the push plate 5, and naturally the push plate 5 will also have a spherical concave that matches the spherical protrusion 8. Groove, at this time the installation between the two can improve the limit strength of the circumferential rotation.

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (5)

1. An axially supported ball screw, comprising a screw, a nut sleeved on the screw, and a steel ball arranged between the screw and the nut, characterized in that, the screw is close to it for connecting an external driving device The end of the end is coaxially provided with a limiter with a taper, the limiter is set so that one end is large and the other end is small, and the large end faces the nut, and the small end faces the drive device; the position corresponding to the limiter on the screw rod is also set There is a push plate, which is set coaxially with the nut, and is sleeved on the limiter, and the limiter is integrally formed with the screw; the end of the screw corresponding to the limiter is also provided with a needle roller thrust bearing , the needle roller thrust bearing is coaxially sleeved on the screw rod, and is attached to the push plate to form a supporting force on the push plate and share the axial force of the screw rod; the push plate and the limiter are located on the needle roller thrust bearing and nuts. 2. The axially supported ball screw according to claim 1, wherein a first block is provided on the nut at one end corresponding to the push plate, and a position corresponding to the first block on the push plate is set There is a second clamping block, the rotation between the first clamping block and the second clamping block is limited by abutting against the nut; the limiter is in the shape of a polygonal platform, and the shape of the connection between the push plate and the limiter is the same as Matched to form a circumferential rotation limit. 3 . The axially supported ball screw according to claim 1 , wherein the end of the screw connected to the external driving device is provided with an internal spline, and is connected to the driving device through the internal spline. 4 . 4. The axially supported ball screw according to claim 1, characterized in that, the raceway formed by the screw and the nut for the rolling of the steel ball is a four-point contact ball structure. 5 . The axially supported ball screw according to claim 2 , wherein a number of spherical protrusions are evenly arranged on the side of the limiting member. 6 .

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