RU2817269C1 - Keyed connection - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to shaft-sleeve coupling. Keyed connection contains a shaft and a bushing, at that the bushing is put on the shaft. Teeth of the shaft and the teeth of the bushing face each other with their ends and in their compatible cavities there is simultaneously a key, which transfers and receives torque between the shaft and the bushing. Key can have a lower hardness in relation to the teeth of the shaft and bushing, possibility of destruction when permissible torque is exceeded and serve as a replaceable part.

EFFECT: creation of safety connection is achieved.

1 cl, 2 dwg

Description

Description of the invention

Field of technology to which the invention relates

The invention relates to mechanical engineering, namely to a “shaft-bushing” type connection, and is intended for transmitting and receiving torque, and can also be used where it is necessary to protect parts from damage when the permissible torque is exceeded.

State of the art

The closest to the claimed invention is a spline (gear) connection - a connection between a shaft (male surface) and a hole (female surface) using splines (cavities) and teeth (protrusions), carried out without the use of an auxiliary part. (See the book by D.N. Reshetov “Machine Parts”, 1989).

The disadvantages of spline connections are the destruction of the spline connection or the entire mechanism when a certain value of the permissible torque is exceeded and an increased load is transferred to the working mechanism, as well as the complexity and high cost of repairs when worn out.

Disclosure of the invention

The technical result of the claimed invention is the creation of a keyed connection - a connection between a shaft (male surface) and a hole (female surface) having splines (cavities) and teeth (protrusions), carried out using an auxiliary part to transmit and perceive torque between the shaft and the hole . The shape, size and material of the auxiliary part are selected based on the specific capabilities of the parts to be connected and the purpose of the connection. In a particular case, a safety key acts as an auxiliary part, so it is necessary to understand that this option is not exhaustive and in no way limits the claimed rights.

One of the distinctive features of a keyed connection is that the teeth of the male part (shaft) and the teeth of the female surface of the part (bushing, hub, etc.) are located not opposite, but side by side, and the connection using an auxiliary part is carried out, respectively, from the end sides splines

In this connection, the bushing is put on the shaft and at the same time the teeth (protrusions) of the shaft and the teeth (protrusions) of the bushing face each other with their ends and in their compatible splines (cavities), at the same time, a safety key is located. When the torque reaches its limit, the safety key is destroyed, preventing increased load from being transferred to the connection and operating mechanism, preventing their failure. To restore torque transmission, the damaged safety key must be replaced. To increase the service life of the shaft teeth and sleeve teeth, as parts that are more complex and expensive to manufacture, the safety key has a lower hardness in relation to them and serves as a replacement part.

The claimed invention is illustrated by the following drawings:

Figure 1 shows a diagram of a connection using a safety key on the end side of the connection, on the side where the sleeve is put on the shaft.

Figure 2 shows a side view of a connection diagram using a safety key.

Designations in figure 1 and figure 2:

1 - female part (bushing, hub, etc.);

2 - tooth (protrusion) of the female part;

3 – safety key;

4 - tooth (protrusion) of the covered part;

5 - male part (shaft);

6 - slot (recess) of the female part;

7 - slot (groove) of the male part.

Carrying out the invention

There are two main methods for assembling the key connection and for installing the safety key 3, so it is necessary to understand that these options are not exhaustive and in no way limit the claimed rights:

1) The safety key 3 is installed in the recesses 7 on the shaft 5, then the female part 1 is put on the shaft 5 and aligning the ends of the teeth 2 of the female part 1 with the ends of the teeth 4 of the shaft 5, allowing the safety key 3 to enter the recesses 6 on the female part 1, thus thereby providing the opportunity for the perception or transmission of torque between the shaft 5 and the female part 1.

2) The female part 1 is put on the shaft 5, the ends of the teeth 2 of the female part 1 are aligned with the ends of the teeth 4 of the shaft 5, then the safety key 3, from the side where the female part 1 is put on the shaft 5, through the depressions 6 of the female part 1, is installed in the aligned depressions 6 of the female part 1 and the cavity 7 of the shaft 5, thereby providing the opportunity to receive or transmit torque between the shaft 5 and the female part 1.

Claims (2)

1. A keyed connection containing a shaft and a bushing, characterized in that there are cavities and teeth on the shaft and in the hole of the bushing, while the bushing is put on the shaft, the teeth of the shaft and bushing face each other with their ends, in compatible cavities of the shaft and bushing at the same time There is a key with the help of which the transmission and perception of torque between the shaft and the bushing is carried out. 2. The keyed connection according to claim 1, characterized in that the key has less hardness in relation to the teeth of the shaft and sleeve, has the possibility of destruction when the permissible torque is exceeded, and serves as a replacement part.