CN204300268U - The main drive nut of ball screw assembly, - Google Patents

Abstract

The utility model discloses a main driving nut of a ball screw pair, which comprises a ball nut; the ball nut is provided with a combined nut seat which can rotate around the ball nut; the outer wall of the ball nut is provided with a first annular roller track (1) and the second annular raceway (2); the combined nut seat cooperates with the ball nut through the balls on the first annular raceway (1) and the second annular raceway (2); The utility model ball screw auxiliary driving nut is matched with the corresponding screw to realize the use of the ball nut as the main rotating driving mechanism, and has the advantages of simple structure, easy processing and convenient assembly.

Description

Main drive nut for ball screw pair

technical field

The utility model relates to a main driving nut of a ball screw pair.

Background technique

The ball screw pair is mainly composed of a screw and a ball nut. It is the most precise and most commonly used transmission device in transmission machinery. With the continuous increase of large and heavy parts, the supporting parts processing machine tools are also developing in the direction of large, heavy, high-speed and high-efficiency, which requires that the main transmission mechanism of the machine tool, the ball screw pair, has a larger nominal diameter and a larger nominal lead. Larger, longer lead screw length, larger support distance, etc. The traditional ball screw pair uses the screw as the main drive rotation mechanism. The increase in the length of the screw and the increase in the support distance will lead to an increase in the deflection of the screw, which will generate a large moment of inertia in the mechanical motion system, which greatly restricts the The increase of the limit speed of the system increases the power of the drive motor at the same time. Compared with the ball screw pair, which uses the screw rotation as the main driving mode, the ball nut as the main rotating driving mechanism has great advantages. However, in the prior art, the main drive nut of the ball screw pair with this function is mainly realized by socketing a number of bearings with nut seats fixed on the ball nut, which not only increases the size of the parts, but also has a complicated structure and poor assembly. Convenience and other issues will also affect the transmission accuracy of the ball screw pair.

Utility model content

The technical problem to be solved by the utility model is to overcome the above disadvantages of the prior art: to provide a main driving nut of a ball screw pair with small space occupation, simple structure, easy processing and convenient assembly.

The technical solution of the utility model is as follows: a main drive nut of a ball screw pair, including a ball nut; the ball nut is provided with a combined nut seat that can rotate around the ball nut; There are a first annular raceway and a second annular raceway; the combined nut seat cooperates with the ball nut through the balls on the first annular raceway and the second annular raceway; The main shell and the secondary shell are composed of the combined main shell and the secondary shell, which are fixed by bolts through the flange structure arranged at their ends; the main shell and the secondary shell are on the first annular raceway and the second annular raceway The distance between the inner wall and the outer wall of the ball nut is smaller than the maximum height of the ball above the outer wall of the ball nut, and the distance between the inner wall of the remaining part and the outer wall of the ball nut is greater than the maximum height of the ball above the outer wall of the ball nut.

There are two semi-circular pre-compressors between the flange structures of the main shell and the auxiliary shell, whose function is to spread the main shell and the auxiliary shell, push the balls and make the balls contact with the first annular raceway and the second annular raceway. The gap between the raceways is eliminated to obtain preloading, and the lightness or heavyness of the preloading value is determined by the thickness of the preloading sheet; there is a gap between the left end surface of the auxiliary shell and the right end surface of the main shell spigot inner hole.

An annular oil filling groove is arranged on the outer wall of the ball nut between the first annular raceway and the second annular raceway;

The bottom of the annular oil filling groove is provided with a through hole communicating with the oil filling hole at the end of the ball nut.

A dustproof sealing ring is provided between the two ends of the combined nut seat and the outer wall of the ball nut.

Both ends of the ball nut are provided with end caps, and any one of the end caps is provided with mounting holes for pulleys or gears.

The beneficial effects of the utility model are: the utility model ball screw auxiliary drive nut coupled with the corresponding lead screw can realize the ball nut as the main rotating driving mechanism, and has the advantages of simple structure, easy processing and convenient assembly.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the main drive nut of the ball screw pair of the present invention.

Fig. 2 is an exploded schematic diagram of the main drive nut of the ball screw pair of the present invention including the lead screw.

Detailed ways

The utility model is described in further detail with specific examples below, but the utility model is not limited to the following specific examples.

Example

As shown in Figure 1-2, a main drive nut of a ball screw pair includes a ball nut; the ball nut is provided with a combined nut seat that can rotate around the ball nut; the outer wall of the ball nut is provided with The first annular raceway 1 and the second annular raceway 2; the combined nut seat cooperates with the ball nut through the balls on the first annular raceway 1 and the second annular raceway 2; the combined nut seat The seat is composed of a main shell 3 and a secondary shell 4 which fit into each other. The main shell 3 and the secondary shell 4 are fixed by bolts through the flange structure arranged at their ends; the main shell 3 and the secondary shell 4 are on the second The distance between the inner wall between the first annular raceway 1 and the second annular raceway 2 and the outer wall of the ball nut is less than the maximum height of the ball above the outer wall of the ball nut, and the distance between the inner wall of the rest of the parts and the outer wall of the ball nut is greater than that of the ball above the outer wall of the ball nut The maximum height; in this way, the balls can be limited in the first annular raceway 1 and the second annular raceway 2; the inner wall of the main shell 3 and the secondary shell 4 can be processed into a stepped or tapered inner wall to achieve.

An annular oil filling groove 5 is arranged between the first annular raceway 1 and the second annular raceway 2 on the outer wall of the ball nut;

The bottom of the annular oil filling groove 5 is provided with a through hole communicating with the oil filling hole at the end of the ball nut. Lubricating oil can be injected into the annular oil filling groove 5 through the oil filling hole at the end of the ball nut.

A dustproof sealing ring 6 is provided between the two ends of the combined nut seat and the outer wall of the ball nut.

The ball nut is a nut with various existing ball circulation modes, and it only needs to be reasonable in structural design.

Both ends of the ball nut are provided with end caps, that is, the ball nut is an end cap type screw nut, and a longitudinal through hole is processed on the ball nut to serve as the return passage of the ball, and the end caps at both ends of the ball nut are provided with The return port of the ball, from which the ball enters the return channel to form a cycle. An installation hole for a pulley or a gear is provided on any of the end covers; it is used to install a pulley or a gear fixed to the ball nut, so that the motor can drive the ball nut to realize the function of the ball screw pair being driven by the nut. The passive workpiece can be connected by the combined nut seat and the main driving nut of the ball screw pair.

As shown in Figure 1, two semi-circular pre-compressors 7 are arranged between the flange structures of the main shell 3 and the secondary shell 4, and the left end surface of the secondary shell and the right end surface of the main shell spigot inner hole are left. There are gaps. That is to say, the sub-housing 4 and the main case 3 can fit together without any gap before the pre-compression piece 7 is installed. Therefore, when installing, the main case 3 and the sub-housing 4 can be completely fitted first, leaving a large gap. Balls are added into the gap between the first annular raceway 1 and the second annular raceway 2, and then the conical inclined surfaces of the inner walls of the main shell 3 and the auxiliary shell 4 are moved closer to the balls through the embedding of the two semi-circular pre-compression pieces 7, Thereby, the ball is limited within the raceway to realize assembly.

Claims (5)

1. A main drive nut of a ball screw pair, comprising a ball nut; it is characterized in that: the ball nut is provided with a combined nut seat that can rotate around the ball nut; the outer wall of the ball nut is provided with a first Annular raceway (1) and second annular raceway (2); the combined nut seat cooperates with the ball nut through the balls on the first annular raceway (1) and the second annular raceway (2) ; The combined nut seat is composed of a main shell (3) and a secondary shell (4) which fit together, and the main shell (3) and the secondary shell (4) are formed by flange structures arranged at their ends The bolts are fixed; the distance between the inner wall of the main housing (3) and the auxiliary housing (4) between the first annular raceway (1) and the second annular raceway (2) and the outer wall of the ball nut is less than the distance between the ball and the ball nut The maximum height of the outer wall, the distance between the inner wall of the remaining part and the outer wall of the ball nut is greater than the maximum height of the ball above the outer wall of the ball nut. 2. The main drive nut of the ball screw pair according to claim 1, characterized in that: two semicircular rings are preloaded between the flange structures of the main housing (3) and the auxiliary housing (4) piece (7); there is a gap between the left end surface of the auxiliary shell (4) and the right end surface of the inner hole of the main shell (3). 3. The main drive nut of the ball screw pair according to claim 1, characterized in that: the outer wall of the ball nut is located between the first annular raceway (1) and the second annular raceway (2). There is an annular oil injection groove (5); the bottom of the annular oil injection groove (5) is provided with a through hole communicating with the oil injection hole at the end of the ball nut. 4. The main drive nut of the ball screw pair according to claim 1, characterized in that: a dust-proof sealing ring (6) is provided between the two ends of the combined nut seat and the outer wall of the ball nut. 5. The main drive nut of a ball screw pair according to claim 1, characterized in that: both ends of the ball nut are provided with end covers, and any one of the end covers is provided with a pulley or a gear mounting hole.