CN211924830U

CN211924830U - Novel ball spline of ball screw

Info

Publication number: CN211924830U
Application number: CN201922016934.5U
Authority: CN
Inventors: 李海涛; 王春阳
Original assignee: Shenzhen Second Intelligent Equipment Co Ltd
Current assignee: Shenzhen Second Intelligent Equipment Co Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-11-13
Anticipated expiration: 2029-11-19

Abstract

The utility model provides a novel ball screw ball spline, it includes lead screw, screw-nut, spline nut, first ball and second ball. The outer periphery of the screw rod is provided with a spiral first ball groove, and a second ball groove is arranged along the axial direction of the screw rod. The screw rod nut and the spline nut are sleeved on the outer peripheral edge of the screw rod, a threaded third ball groove is formed in the screw rod nut, and a fourth ball groove extending along the axial direction of the spline nut is formed in the spline nut. The utility model discloses be fit for using in the accurate transmission structure that needs rotary motion and linear motion simultaneously, the utility model discloses a screw-nut is responsible for providing rotatory drive power, and the spline nut that increases is responsible for providing the drive power of straight line direction. Not only can guarantee accurate transmission performance, simple structure has reduced ball screw ball spline's use cost moreover, also very big shortening shipment time simultaneously.

Description

Novel ball spline of ball screw

Technical Field

The utility model belongs to the transmission field especially relates to a novel ball screw ball spline.

Background

In a precision transmission structure requiring both rotation and lifting, a ball screw ball spline is the most suitable choice. At present, the existing ball spline structure of the ball screw is mature and stable, but at present, mass production manufacturers are few, specification models are single, the existing ball spline structure is basically a hollow screw, the price is high, and the shipment period is long. (e.g., a THK brand ball screw ball spline, 3000+ RMB, 1 month out of shipment.)

The ball screw ball splines currently on the market are basically 3232, 2525 and 2020 (2020: the outer diameter of the screw is 20mm and the lead is also 20mm), and are all hollow, so that in some cases, no hollow screw is needed, or even smaller screws (such as 1616, 1610 and 1210 specifications) are basically not available.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a novel ball screw ball spline is provided, it is single to aim at solving current ball screw ball spline specification, and the price is high, the long problem of shipment phase.

The utility model is realized in such a way, a novel ball screw ball spline comprises a screw, a hollow screw nut, a hollow spline nut, a first ball and a second ball; the screw rod is provided with a first spiral ball groove on the outer periphery, a second ball groove is arranged on the outer periphery of the screw rod along the axial direction of the screw rod, the screw rod nut and the spline nut are sleeved on the outer periphery of the screw rod, a third screw thread ball groove is arranged in the screw rod nut, and a fourth ball groove extending along the axial direction of the spline nut is arranged in the spline nut; the first ball groove and the third ball groove jointly form a first channel for the first ball to slide, and the second ball groove and the fourth ball groove jointly form a second channel for the second ball to slide; and the feed screw nut and the spline nut are respectively provided with a connecting part for connecting with a driven object.

Furthermore, be equipped with two second ball grooves on the outer peripheral edges of lead screw, two second ball grooves are followed the axle center symmetry of lead screw sets up, and is corresponding, spline nut is inside to be equipped with two fourth ball grooves, two fourth ball grooves are followed spline nut's axle center symmetry sets up.

Furthermore, the radial cross sections of the second ball groove and the fourth ball groove are both semicircular.

Furthermore, the connecting part of the screw rod nut is formed by radially extending the outer periphery of the screw rod nut.

Furthermore, a plurality of first mounting holes are formed in the connecting portion of the feed screw nut.

Further, the connecting portion of the spline nut is formed by radially extending the outer periphery of the spline nut.

Furthermore, a plurality of second mounting holes are formed in the connecting portion of the spline nut.

Further, the screw rod nut and the spline nut are arranged at a distance in the axial direction of the screw rod.

Further, the screw rod is a ball screw rod or a T-shaped screw rod.

Compared with the prior art, the utility model, beneficial effect lies in:

the utility model discloses a ball screw ball spline is fit for using in the accurate transmission structure that needs rotary motion and linear motion simultaneously. Only need on the surface of lead screw, grind the required axial slot of second ball that processes out spline nut, then adorn spline nut and can make the utility model discloses a ball screw ball spline, consequently, the specification can be done very abundantly. The utility model discloses a screw-nut is responsible for providing rotatory drive power, and the spline nut that increases is responsible for providing the drive power of straight line direction. It can be seen that the utility model discloses not only can guarantee accurate transmission performance, simple structure has reduced ball screw ball spline's use cost moreover, also very big shortening shipment time simultaneously.

Drawings

Fig. 1 is a schematic perspective view of a novel ball screw ball spline according to an embodiment of the present invention;

FIG. 2 is an axial cross-sectional schematic view of the ball screw ball spline of FIG. 1;

FIG. 3 is an enlarged view of area A of FIG. 2;

FIG. 4 is a perspective view of a screw nut in the ball screw ball spline of FIG. 1;

FIG. 5 is a perspective view of a spline nut in the ball screw ball spline of FIG. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 3, a preferred embodiment of the present invention is shown, which is a novel ball screw ball spline, including a screw 1, a hollow screw nut 2, a hollow spline nut 3, a first ball 4a and a second ball 4 b.

The screw rod nut 2 and the spline nut 3 are sleeved on the outer periphery of the screw rod 1. The screw rod 1 is provided with a spiral first ball groove 11 on the outer periphery, and a second ball groove 12 is provided on the outer periphery of the screw rod 1 along the axial direction. Referring to fig. 4, the lead screw nut 2 is provided with a third ball groove 21 in a screw shape inside, and referring to fig. 5, the spline nut 3 is provided with a fourth ball groove 31 extending in an axial direction thereof inside. The first ball groove 11 and the third ball groove 21 together form a first channel for the first ball 4a to slide, and the second ball groove 12 and the fourth ball groove 31 together form a second channel for the second ball 4b to slide.

In this embodiment, in order to increase the stability in the transmission process, two second ball grooves 12 are provided on the outer periphery of the screw rod 1, the two second ball grooves 12 are symmetrically disposed along the axis of the screw rod 1, correspondingly, two fourth ball grooves 31 are provided inside the spline nut 3, and the two fourth ball grooves 31 are symmetrically disposed along the axis of the spline nut 3.

Preferably, the radial cross-sectional shapes of the second ball groove 12 and the fourth ball groove 31 are both semicircular. The screw rod 1 is a ball screw rod or a T-shaped screw rod.

For mounting the driven component, the spindle nut 2 and the spline nut 3 are arranged at a distance in the axial direction of the spindle 1, thus providing a mounting space for mounting the driven component.

The feed screw nut 2 is provided with a first connecting part 22 used for being connected with a driven object, the first connecting part 22 of the feed screw nut 2 is formed by radially extending the outer peripheral edge of the feed screw nut 2, and the first connecting part 22 of the feed screw nut 2 is provided with a plurality of first mounting holes 221. The spline nut 3 is provided with a second connecting part 32 used for being connected with a driven object, the second connecting part 32 of the spline nut 3 is formed by radially extending the outer peripheral edge of the spline nut 3, and the second connecting part 32 of the spline nut 3 is provided with a plurality of second mounting holes 321.

The working principle of the ball screw ball spline of the present embodiment is as follows:

the screw rod 1 rotates, the first ball 4a moves in the first channel and converts the rotary motion into linear motion, so that the screw rod nut 2 is driven to slide along the axial direction (linear direction) of the screw rod 1, meanwhile, the second ball 4b is embedded in the second channel, and the spline nut 3 and the screw rod 1 form a buckling relation in the circumferential direction through the second ball 4b (but the spline nut 3 still can realize relative linear sliding with the screw rod 1 in the axial direction), so that when the screw rod 1 rotates, the spline nut 3 can be driven to rotate. When the feed screw nut 2 and the spline nut 3 are simultaneously connected with a driven part, the driven part can simultaneously realize rotation and linear motion.

The ball spline of the ball screw is suitable for being applied to a precise transmission structure which needs to rotate and move linearly at the same time. The ball screw ball spline of the present embodiment can be manufactured by grinding the axial grooves (i.e., the second ball grooves 12) required for the second balls 4b of the spline nut 3 only on the surface of the screw, and then fitting the spline nut 3, so that the specification can be made very rich. The feed screw nut of the present embodiment is responsible for providing a rotational driving force, and the added spline nut 3 is responsible for providing a linear driving force. Therefore, the embodiment not only can ensure accurate transmission performance, but also has simple structure, reduces the use cost of the ball spline of the ball screw, and greatly shortens the delivery period.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A novel ball screw ball spline is characterized by comprising a screw, a hollow screw nut, a hollow spline nut, a first ball and a second ball; the screw rod is provided with a first spiral ball groove on the outer periphery, a second ball groove is arranged on the outer periphery of the screw rod along the axial direction of the screw rod, the screw rod nut and the spline nut are sleeved on the outer periphery of the screw rod, a third screw thread ball groove is arranged in the screw rod nut, and a fourth ball groove extending along the axial direction of the spline nut is arranged in the spline nut; the first ball groove and the third ball groove jointly form a first channel for the first ball to slide, and the second ball groove and the fourth ball groove jointly form a second channel for the second ball to slide; and the feed screw nut and the spline nut are respectively provided with a connecting part for connecting with a driven object.

2. The novel ball screw ball spline of claim 1, wherein two second ball grooves are provided on the outer periphery of the screw, and the two second ball grooves are symmetrically arranged along the axial center of the screw, and correspondingly, two fourth ball grooves are provided inside the spline nut, and the two fourth ball grooves are symmetrically arranged along the axial center of the spline nut.

3. The novel ball screw ball spline of claim 1, wherein the radial cross-sections of the second and fourth ball grooves are each semi-circular in shape.

4. The novel ball screw ball spline of claim 1, wherein the connecting portion of the screw nut is formed by radially extending the outer periphery of the screw nut.

5. The novel ball screw ball spline of claim 4, wherein the connecting portion of the screw nut defines a plurality of first mounting holes.

6. The novel ball screw ball spline of claim 1, wherein the coupling portion of the spline nut is formed by radially extending the outer periphery of the spline nut.

7. The novel ball screw ball spline of claim 6, wherein the coupling portion of the spline nut defines a plurality of second mounting holes.

8. The novel ball screw ball spline of any one of claims 1 to 7, wherein the screw nut and spline nut are disposed at a distance in the axial direction of the screw.

9. A novel ball screw ball spline according to any one of claims 1 to 7 wherein said screw is a ball screw or a T-screw.