JPS6124383Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a torque transmission structure for a crankshaft in a press. Although there are various slide drive structures for presses, the structure shown in FIG. 1 can be said to be one of the most commonly used. In this figure, a flywheel 2 is driven by a main motor 1 via a V-belt, and a drive pinion 5 is rotated via a clutch 3 and a brake 4. Thereafter, torque is transmitted to the intermediate gear 6, main pinion 7, and main gear 8, the crankshaft 9 is rotated by the main gear 8 fixed thereto, and the slide 11 is moved up and down by the crank mechanism via the connecting rod 10. It has a moving structure.

Conventionally, the main gear 8 has been prevented from rotating on the crankshaft 9 by a key. For this reason, there were problems such as the necessity of key alignment work during assembly, and the presence of keyway notches in the crankshaft 9 and main gear 8, which was inconvenient in terms of strength. The present invention was devised to provide a structure for fixing the main gear 8 to the crankshaft 9 instead of using a key to prevent rotation.Hereinafter, an embodiment of the present invention will be described based on the drawings.

In FIGS. 2 and 3, the driving pinion 5 and the intermediate gear 6 are meshed, the intermediate gear 6 and the main pinion 7 are integrated, and the fuselage 12 is rotatable via a pin. The crankshaft 9 is rotatably held at its bearing portion 9a by a bearing 14 fixed to the body 12. On the crankshaft 9,
The web 9b is provided eccentrically from the bearing portion 9a. This web 9b is fitted into a hole in the boss portion of the main gear 8, and a bolt 13 is used to prevent the main gear 8 from coming off into the web 9b. This main gear 8 meshes with the main pinion 7,
Torque is transmitted to the crankshaft 9. That is, since the main gear 8 rotates around the center of the bearing part 9a, and the web 9b is eccentric from this,
The torque of main gear 8 will be transmitted to crankshaft 9.

Since the present invention has the above-described configuration, there is no notch in the crankshaft 9 and main gear 8, no need for key alignment work, and no torsional stress is generated in the bearing as in the conventional case. Furthermore, since the space near the web 9b can be used, there is an effect that it can be made more compact.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the conventional structure, Figure 2 is a sectional view of the main part, Figure 3 is a view taken in the direction of the arrow in Figure 2,
is the main motor, 2 is the flywheel, 3 is the clutch, 4 is the brake, 5 is the drive pinion, 6 is the intermediate gear, 7 is the main pinion, 8 is the main gear, 9 is the crankshaft, 10 is the connecting rod, 11 is the 12 is a slide, 13 is a bolt, and 14 is a bearing.

Claims (1)

[Scope of utility model registration request] The gear for reducing the speed of the press, which is fixed to the crankshaft and transmits torque to the crankshaft, is adapted to a web installed eccentrically from the bearing of the crankshaft to transmit torque to the crankshaft. A crankshaft torque transmission structure in a press characterized by a transmission structure.