JPS6367430A - Universal coupling - Google Patents

Abstract

PURPOSE:To enable a universal coupling to rotate in a high speed at a large axial angle, by enabling the axial angle, formed between a driving shaft and a driven shaft, to be freely changed while bevel gears, secured to end parts of the driving shaft and the driven shaft of the universal coupling, perform transmission through an intermediate bevel gear. CONSTITUTION:A driving bevel gear 3, secured to a driving shaft 1, is meshed with an intermediate bevel gear 6, mounted through an intermediate bevel gear bearing 13, and transmitted so that the gear 3 freely turns with an intermediate shaft 5 serving as the center. The driving shaft 1 is mounted to a driving shaft case 7 through a driving shaft bearing 11, and also the intermediate shaft 5 is integrally secured to the driving shaft case 7. A driven shaft 2 is mounted to a driven shaft case 8 through a driven shaft bearing 12. The driven shaft case 8 is turnably mounted by the degree of a fixed angle with the intermediate shaft 5 serving as the center for the driving shaft case 7, and a driven bevel gear 4, secured to the driven shaft 2, meshes with the intermediate bevel gear 6 performing transmission. A rotation of the driving shaft 1 is transmitted to the driven shaft 2 via the intermediate bevel gear 6. Accordingly, a universal coupling, while it transmits the rotation of the driving shaft 1 by the driven shaft 2, enables an axial angle to be freely changed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a universal joint that can change the transmission of a rotating shaft to any angle or direction.

As shown in Figure 3, the structure of a conventional universal joint is that there is a floating part between the driving shaft and the driven shaft that connects to both shafts at two points and rotates, and the floating part rotates at an angle twice the shaft angle. Since the structure transmits rotation while reciprocating with each rotation, pulsation occurs in proportion to the shaft angle, so the shaft angle and transmission force are inversely proportional to each other, and the practical shaft angle was about 10'. For this reason, there have been no universal joints that can withstand high speed rotation and high output with large shaft angles.

In addition, the floating part was expensive because it required special precision machining. Although universal joints are an important structural element of machines, they were never realized.

The object of the present invention is to obtain a universal joint that eliminates the above-mentioned drawbacks by simple means without special precision machining.

To explain this invention based on the drawings, the drive bevel gear 3 fixed to the end of the drive shaft I is attached via the intermediate bevel gear bearing I3 so as to freely rotate about the intermediate shaft 5. It meshes with the intermediate bevel gear 6 and transmits power. The drive shaft l is attached to the drive shaft case 7 via the drive shaft bearing 11, and the intermediate shaft 5 of the intermediate bevel gear 6 is also fixedly integrated with the drive shaft case 7.

The driven shaft 2 is attached to the driven shaft case 8 via a driven shaft bearing 12. The driven shaft case 8 is rotatably attached to the drive shaft case 7 within a certain angle θ with the intermediate shaft 5 as the center. The bevel gear 6 meshes and transmits power. The rotation of the drive shaft l is transmitted to the driven shaft 2 via the intermediate bevel gear 6. The driven shaft 2 transmits the rotation of the drive shaft 1 and can freely change the shaft angle θ to any desired shaft angle.

Unlike conventional universal joints, this invention does not limit the transmission force due to the shaft angle, and the shaft angle and direction can be changed freely during transmission, so there is no reduction in transmission efficiency at all. Furthermore, since it is a gear transmission, smooth transmission is obtained and there is no pulsation, so high-speed rotation and high-output transmission are possible. Manufacturing costs are low because no special precision-machined parts are required. By applying this universal joint, it is possible to transmit high output power from a powerful power source built into the body of an industrial robot, etc. to the tip of a multi-joint arm with a built-in universal joint. Compared to robots that have a small power source attached to them, they can perform much more powerful tasks that were previously impossible. Furthermore, in the case of multidimensional processing machines for machine tools, conventionally, a drive motor is attached directly to the spindle, which results in a large weight, and there is a drive loss when moving the spindle in each dimensional direction. By applying this universal joint, it is possible to manufacture small and inexpensive machines. By changing the number of teeth of the drive bevel gear 3 and the driven bevel gear 4 of this universal joint, a transmission effect can be obtained. Further, by increasing the number of teeth of the intermediate bevel gear (6) relative to the drive bevel gear (3), the shaft angle θ can be increased to 1809 or more in proportion to the number of teeth. In this way, it has the effect of being able to transmit high power at high speed over a wide range of shaft angles that was previously impossible.

[Brief explanation of the drawing]

FIG. 1 is a plan view of this universal joint, FIG. 2 is a longitudinal cross-sectional view showing an embodiment of the rotary connection, and FIG. 3 is a principle diagram of a conventional type. 1... Drive shaft, 2... Driven shaft, 3... Drive bevel gear, 4... Driven bevel gear, 5... Intermediate Axis, 6...
・Intermediate bevel gear, 7... Drive shaft case 8...
... Driven shaft case, 9 ... Drive shaft outer cylinder,
IO... Rotating connection part, 11... Drive shaft bearing, I2... Driven shaft bearing, 13...
...Intermediate bevel gear bearing,

Claims (1)

[Claims] (1) (A) The drive bevel gear (3) fixed to the end of the drive shaft (1) is connected to the intermediate shaft (5) via the intermediate bevel gear bearing (13), and the intermediate bevel gear (6) rotates freely through the intermediate bevel gear bearing (13). ) and transmits transmission. The drive shaft outer cylinder (9) is rotatably attached to the drive shaft case (7) via the rotational connection part (10), and the drive shaft (1) is attached to the drive shaft case (7).
is also attached to the drive shaft case (7) via the drive shaft bearing (11). The intermediate shaft (5) is also fixed to the drive shaft case (7). (b) Driven bevel gear (4) fixed to the end of the driven shaft (2)
The rotation of the drive shaft (1) meshing with the intermediate bevel gear (6) is transmitted to the driven shaft (2) via the intermediate bevel gear (6). The driven shaft (2) is connected to the driven shaft case (8) via the driven shaft bearing (12).
). The driven shaft case (8) is connected to the intermediate shaft (5) of the drive shaft case (7).
) is attached so that it can rotate freely around the axis. (c) The driven shaft (2) transmits the rotation of the drive shaft (1) via the intermediate bevel gear (6), and rotates the driven shaft (2) at any angle within the range of the shaft angle (θ) with the intermediate shaft (5) as the axis. A universal joint characterized in that the direction of the driven shaft (2) relative to the drive shaft outer cylinder (9) can be changed in any direction by changing the shaft angle.