WO2021169215A1

WO2021169215A1 - High-coaxiality electric motor shaft

Info

Publication number: WO2021169215A1
Application number: PCT/CN2020/112110
Authority: WO
Inventors: 陈美林
Original assignee: 温岭市百弘机械有限公司
Priority date: 2020-02-24
Filing date: 2020-08-28
Publication date: 2021-09-02
Also published as: CN211693191U

Abstract

A high-coaxiality electric motor shaft, comprising a front shaft (1) made of stainless steel materials and a rear shaft (2) made of carbon steel materials. The front end of the rear shaft (2) is provided with a columnar connecting part (2a), the rear end of the front shaft (1) is provided with a slot (1a) allowing the connecting part (2a) to insert therein, the connecting part (2a) is tightly pressed on the bottom wall of the slot (1a), the connecting part (2a) is provided with an external spline (2a1), the inner wall of the slot (1a) is provided with an internal spline, and the connecting part (2a) and the front shaft (1) are in meshed connection by means of the internal spline and the external spline (2a1); and a straight hole (1b) is provided in the front shaft (1) in a penetrating mode, two ends of the straight hole (1b) extend to the bottom wall of the slot (1a) and the front end face of the front shaft (1) respectively, a T-shaped screw rod (3) is arranged in the straight hole (1b), the screw rod (3) consists of a head part (3a) and a rod part (3b), a threaded hole is provided in the connecting part (2a), the rear end of the rod part (3b) is connected into the threaded hole in a threaded mode, an annular shoulder (1b1) is integrally formed on the hole wall of the straight hole (1b), and the head part (3a) is tightly pressed on the front end surface of the annular shoulder (1b1) to form a seal. The high-coaxiality electric motor shaft is convenient to assemble.

Description

A motor shaft with high coaxiality

Technical field

The utility model belongs to the technical field of machinery, and relates to a motor shaft, in particular a high coaxiality motor shaft.

Background technique

In order to avoid rusting due to contact of the motor shaft with external water, the existing conventional motors also use surface treatment such as electroplating on the front end of the motor shaft. The electroplating layer on the surface is easy to fall off when immersed in water, so the rust prevention time is short and the effect is poor; after the surface treatment of the motor shaft , The plating layer is difficult to achieve precision and uniformity, so that the concentricity of the entire shaft is reduced, and it is easy to cause the motor to vibrate.

For this situation, people have realized this shortcoming and have made improvements. For example, a motor shaft for submersible pumps [application number: 201020167152.8; authorization announcement number: CN 201650828 U], set in Between the motor in the submersible pump and the shaft pump, the motor shaft includes a rear motor shaft made of carbon steel and a front motor shaft made of stainless steel. The rear motor shaft is located in the motor and is connected to the The rotor in the motor is fixedly connected, one end of the front motor shaft is fixedly connected to the rear motor shaft, and the other end extends out of the motor to be fixedly connected to the shaft pump.

technical problem

The above-mentioned submersible pump motor shaft has a front motor shaft made of stainless steel material and a rear motor shaft made of carbon steel material, which well solves the problems existing in the prior art. However, there is still a problem with the motor shaft: the front motor shaft and the rear motor shaft are welded directly through the end faces of the two, which causes certain difficulties in processing.

Technical solutions

The purpose of the utility model is to solve the above-mentioned problems in the prior art, and propose a high coaxiality motor shaft with convenient assembly and high transmission accuracy.

The purpose of the utility model can be achieved by the following technical solutions: a high-concentricity motor shaft, including a front shaft made of stainless steel material and a rear shaft made of carbon steel material, the front end of the rear shaft has a columnar shape The connecting part, the rear end of the front axle is provided with a groove for inserting the connecting part, and the connecting part is pressed tightly on the bottom wall of the groove, characterized in that the connecting part has an external spline, and the inner wall of the groove has an internal spline , And the connecting part and the front shaft are meshed and connected by internal splines and external splines; the front shaft has a straight hole through it, and the two ends of the straight hole respectively extend to the bottom wall of the groove and the front face of the front shaft. There is a T-shaped screw. The screw is composed of a head and a rod. The connecting part is provided with a threaded hole. The shoulder is arranged coaxially with the front axle, and the head is pressed tightly on the front end surface of the annular shoulder to form a seal.

When assembling, the connection between the front axle and the rear axle can be completed by inserting the connecting part into the groove and tightening the positioning rod. The operation is simple and convenient, and the operation steps are also few, so as to effectively improve the ease of assembly.

The connecting part and the front axle are meshed and connected by the external splines arranged on the connecting part and the internal splines arranged on the inner wall of the groove, which can effectively increase the coaxiality of the front axle and the rear axle, and reduce the difference between the two The length of the connection to improve the stability and accuracy of the transmission.

In the above-mentioned high-concentricity motor shaft, the straight hole is a round hole, the side wall of the head is a circumferential surface matching the straight hole, and the side wall of the head is abutting against the wall of the straight hole. The above-mentioned design can provide a better guide for screw installation and further improve the ease of assembly.

In the above-mentioned high-concentricity motor shaft, the side wall of the head is provided with an annular groove, an O-ring is arranged in the annular groove, and the outer peripheral surface of the O-ring is against the wall of the straight hole . Under the combined action of the O-ring and the head pressing on the annular shoulder, the sealing effect formed between the screw and the front axle can be effectively strengthened, and impurities such as water and dust can be effectively prevented from entering the front axle. The motor shaft always maintains a stable weight to improve the transmission accuracy of the motor shaft.

In the above-mentioned high coaxiality motor shaft, a polygonal hole is opened in the middle of the front end surface of the head. The polygonal hole is matched with the tool to facilitate the screwing in.

In the above-mentioned high-concentricity motor shaft, the screw is made of stainless steel.

Beneficial effect

Compared with the prior art, the high coaxiality motor shaft has the following advantages:

1. When assembling, you only need to insert the connecting part into the groove and tighten the positioning rod to complete the connection of the front axle and the rear axle. The operation is simple and convenient, and the operation steps are also few, so as to effectively improve the convenience of assembly.

2. The connecting part and the front axle are meshed and connected by the external splines arranged on the connecting part and the internal splines arranged on the inner wall of the groove, which can effectively increase the coaxiality of the front axle and the rear axle, and reduce the two The length of the connection to improve the stability and accuracy of the transmission.

3. Under the combined action of the O-ring and the head pressing on the annular shoulder, the sealing effect formed between the screw and the front axle can be effectively strengthened, and impurities such as water and dust can be effectively prevented from entering the front axle. , So that the motor shaft always maintains a stable weight to improve the transmission accuracy of the motor shaft.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the high-coaxiality motor shaft.

Fig. 2 is a schematic diagram of the enlarged structure at A in Fig. 1.

Fig. 3 is a schematic diagram of the connection structure of the front axle and the connection part.

In the figure, 1. front axle; 1a, groove; 1b, straight hole; 1b1, annular shoulder; 2. rear axle; 2a, connecting part; 2a1, external spline; 3. screw; 3a, head; 3a1 , Polygonal hole; 3b, rod; 4, 0-shaped ring.

The best mode of the present invention

The following are specific embodiments of the present utility model combined with the accompanying drawings to further describe the technical solution of the present utility model, but the present utility model is not limited to these embodiments.

As shown in Fig. 1, the high-concentricity motor shaft includes a front shaft 1 made of stainless steel and a rear shaft 2 made of carbon steel. Wherein, a column-shaped connecting portion 2a is integrally formed on the front end surface of the rear axle 2, and the connecting portion 2a and the rear axle 2 are coaxially arranged. The rear end of the front axle 1 is provided with a groove 1a for inserting the connecting portion 2a, and the connecting portion 2a is pressed tightly on the bottom wall of the groove 1a.

Specifically, as shown in FIGS. 1 and 3, the connecting portion 2a has an external spline 2a1, the inner wall of the groove 1a has an internal spline, and the connecting portion 2a and the front shaft 1 pass through the internal spline and the external spline 2a1. Engagement connection. As shown in FIG. 1, the front axle 1 has a straight hole 1 b penetrating therethrough. The straight hole 1 b is arranged coaxially with the front axle 1, and both ends of the straight hole 1 b extend to the bottom wall of the groove 1 a and the front end surface of the front axle 1 respectively. A T-shaped screw 3 is provided in the straight hole 1b. The screw 3 is an integrated structure and is composed of a head 3a and a rod 3b. The connecting portion 2a is provided with a threaded hole, and the rear end of the rod portion 3b is screwed into the threaded hole. An annular shoulder 1b1 is integrally formed on the wall of the straight hole 1b. The annular shoulder 1b1 is coaxially arranged with the front axle 1, and the head 3a is pressed against the front end surface of the annular shoulder 1b1 to form a seal. When assembling, only the connecting portion 2a is inserted into the groove 1a and the positioning rod is tightened to complete the connection of the front axle 1 and the rear axle 2. The operation is simple and convenient, and the operation steps are also few, so as to effectively improve the ease of assembly.

To further illustrate, as shown in Figs. 1 and 2, the straight hole 1b is a round hole, the side wall of the head 3a is a circumferential surface matching the straight hole 1b, and the side wall of the head 3a and the hole wall of the straight hole 1b abut against each other. The side wall of the head 3a is provided with an annular groove 1a, the annular groove 1a and the head 3a are arranged coaxially, the annular groove 1a is provided with an O-ring 4, and the outer peripheral surface of the O-ring 4 and the straight hole 1b The wall of the hole is offset. Under the combined action of the O-ring 4 and the head 3a on the annular shoulder 1b1, the sealing effect formed between the screw 3 and the front axle 1 can be effectively strengthened, and water, dust and other impurities can be effectively prevented from entering the front Axis 1, so that the motor shaft always maintains a stable weight to improve the transmission accuracy of the motor shaft.

As shown in Fig. 1, a polygonal hole 3a1 is opened in the middle of the front end surface of the head 3a. The polygonal hole 3a1 is matched with a tool to facilitate the screw 3 to be screwed in. In this embodiment, it is preferable that the polygonal hole 3a1 is a quadrilateral hole, and the screw 3 is made of stainless steel.

The specific embodiments described in this article are merely examples to illustrate the spirit of the present utility model. Those skilled in the technical field of the present utility model can make various modifications or additions to the specific embodiments described or substitute similar methods, but they will not deviate from the spirit of the present utility model or surpass the appended claims. The defined range.

Claims

A high-concentricity motor shaft, comprising a front shaft (1) made of stainless steel and a rear shaft (2) made of carbon steel. The front end of the rear shaft (2) has a cylindrical connecting part (2a). ), the rear end of the front axle (1) is provided with a groove (1a) for inserting the connecting portion (2a), and the connecting portion (2a) is pressed tightly on the bottom wall of the groove (1a), characterized in that the connecting portion (2a) has an external spline (2a1), the inner wall of the groove (1a) has an internal spline, and the connecting portion (2a) and the front shaft (1) are engaged and connected by the internal spline and the external spline (2a1); The front axle (1) has a straight hole (1b) penetrating through it, and the two ends of the straight hole (1b) respectively extend to the bottom wall of the groove (1a) and the front end face of the front axle (1), and the straight hole (1b) is set in There is a T-shaped screw (3). The screw (3) is composed of a head (3a) and a rod (3b). The connecting part (2a) is provided with a threaded hole, and the rear end of the rod (3b) is screwed on In the threaded hole, an annular shoulder (1b1) is integrally formed on the wall of the straight hole (1b). The annular shoulder (1b1) is arranged coaxially with the front axle (1), and the head (3a) is pressed tightly on the annular shoulder (1b1) A seal is formed on the front end face.
The high coaxiality motor shaft according to claim 1, wherein the straight hole (1b) is a round hole, the side wall of the head (3a) is a circumferential surface that matches the straight hole (1b), and The side wall of the head (3a) and the wall of the straight hole (1b) abut against each other.
The high coaxiality motor shaft according to claim 2, characterized in that the side wall of the head (3a) is provided with an annular groove (1a), and the annular groove (1a) is provided with a 0-shaped Ring (4), and the outer peripheral surface of the O-ring (4) is against the hole wall of the straight hole (1b).
The high coaxiality motor shaft according to claim 1 or 2 or 3, characterized in that a polygonal hole (3a1) is opened in the middle of the front end surface of the head (3a).
The high concentricity motor shaft according to claim 1 or 2 or 3, characterized in that the screw (3) is made of stainless steel.