CN207333473U - A kind of transmission device - Google Patents

Abstract

The utility model discloses a transmission device. The transmission device includes a main shaft, a shaft coupling, a snap ring and a limit nut. The cross-section of one end of the main shaft is a triangular shaft end, the shaft end is provided with a circlip groove, and the other side is provided with threads, the cross section of the through hole of the coupling is a triangular shaft end, and the coupling and the main shaft have a triangular shaft end For clearance fit, the circlip is stuck in the circlip groove of the main shaft, and the limit nut is installed on the main shaft to cooperate with the circlip to fix the coupling axially. The utility model is mainly used in occasions where the shaft diameter of the main shaft is small and a large load needs to be transmitted, and the transmission load is large and the concentrated stress is small.

Description

a transmission

technical field

The utility model relates to a transmission structure, in particular to a main shaft transmission device.

Background technique

With the rapid development of social economy, the demand for miniaturization of high-load drive shafts is becoming stronger and stronger. The power transmission of the traditional spindle mainly relies on flat key, spline transmission or frictional load transmission through interference fit. The flat key relies on two sides as the working surface, and the key transmits torque by the extrusion of the key and the side of the keyway. It is suitable for shafts with high speed or impact and variable load, but it needs to open a keyway on the shaft, which will weaken the shaft. The strength cannot meet the requirements of small diameter spindles to transmit high-strength loads. Similarly, the splines also need to be slotted to reduce the strength of the spindles. The use of addictive fits uses friction to make the transmission unstable, and parts are prone to damage during assembly.

Contents of the invention

Purpose of the invention: In view of the above problems, to overcome the above shortcomings, to provide a transmission device, the connecting section of the main shaft and the coupling adopts a Reloux triangle, so as to realize the transmission of high-strength load by the small shaft diameter main shaft.

Technical solution: a transmission device, including a main shaft, a shaft coupling, a circlip and a limit nut. The main shaft is provided with a circlip groove and a screw thread, and the cross section of the outer contour of the main shaft end is a triangular shape. The coupling is provided with connection holes, bosses and matching holes, and the cross section of the matching holes is a triangular shape. The limit nut is matched with the thread on the main shaft, the shaft coupling is matched with the shaft end on the main shaft with clearance, the circlip is stuck in the circlip groove on the main shaft, and the circlip and the limit nut make the coupling axially fixed.

Further, the main shaft is made of alloy steel.

Further, the material of the coupling is 40Cr or 42CrMo.

Further, the number of connecting holes on the coupling is 8, which are evenly distributed along the circumferential direction.

Further, the material of the main shaft is 42CrMo.

The principle of the utility model: the connecting section of the main shaft and the coupling adopts the Reloux triangle. The Leroux triangle is the figure with the smallest area that can be formed by a curve of constant width, and it is composed of 3 arcs. It has no stress concentration and realizes small Shaft spindles transmit high-intensity loads.

Beneficial effects: Compared with the prior art, the utility model has the advantages that the power between the main shaft and the coupling is transmitted by using the Leroux triangle, and there is no need to make grooves on the main shaft, so that the small-diameter main shaft can transmit high-intensity loads.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the utility model.

Fig. 2 is a three-dimensional schematic diagram of the practical spindle.

Fig. 3 is a three-dimensional schematic diagram of the coupling of the utility model.

Detailed ways

The following is a specific embodiment to further illustrate the utility model. It should be understood that this embodiment is only used to illustrate the utility model and is not intended to limit the scope of the utility model. After reading the utility model, those skilled in the art will understand the utility model Modifications in various equivalent forms fall within the scope defined by the appended claims of the present application.

As shown in FIG. 1 , a transmission device includes a main shaft 1 , a shaft coupling 2 , a snap ring 3 and a limit nut 4 . The material of the main shaft 1 and the coupling 2 is 42CrMo. The main shaft 1 is provided with a circlip groove 101 and a screw thread 103, and the cross section of the outer contour of the shaft end 102 of the main shaft 1 is a triangular shape. The coupling 2 is provided with 8 connecting holes 201 , bosses 203 and matching holes 202 , and the cross section of the matching holes 202 is a triangular shape. The limit nut 4 is matched with the screw thread 103 on the main shaft 1, the matching hole 202 of the shaft coupling 2 is in clearance fit with the shaft end 102 on the main shaft 1, the circlip 3 is stuck in the circlip groove 101 on the main shaft 1, and The spring 3 and the limit nut 4 make the shaft coupling 2 axially fixed.

Claims (5)

1. A transmission device, including a main shaft (1), a coupling (2), a circlip (3) and a limit nut (4), the main shaft (1) is provided with a circlip groove (101), a thread (103 ), the coupling (2) is provided with a connection hole (201), a boss (203), and a matching hole (202), and the limit nut (4) is matched with the thread (103) on the main shaft (1), The shaft coupling (2) is in clearance fit with the shaft end (102) on the main shaft (1), the circlip (3) is stuck in the circlip groove on the main shaft (1), and the circlip (3) and the limit nut (4 ) to fix the coupling (2) in the axial direction, which is characterized in that the outer contour section of the shaft end (102) of the main shaft (1) is a sharp triangle, and the cross section of the matching hole (202) on the coupling (2) is a narrow Fall triangle. 2. A transmission device according to claim 1, characterized in that: the main shaft (1) is made of alloy steel. 3. A transmission device according to claim 1 or 2, characterized in that: the material of the coupling (2) is 40Cr. 4. A transmission device according to claim 1, characterized in that: the number of connecting holes on the coupling (2) is 8, which are evenly distributed along the circumferential direction. 5. A transmission device according to claim 1, characterized in that: the material of the main shaft (1) and coupling (2) is 42CrMo.