JPH028123Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear, and particularly to a structure between a gear boss and a gear rim.

In gear devices, in order to reduce the size and weight of the device, it is common practice to branch the input from the prime mover to two or three gears and transmit the input to the driven device. Such a gear device is generally called a locked train gear device. An example of this conventional locked train gear system is shown in FIG.

In FIG. 1, the first pinion 2 is connected to the prime mover 1.
The input transmitted to the two first gears 3a, 3b
It is divided into two parts and communicated. Second pinions 5a, 5b are connected to the first gears 3a, 3b via torsion shafts 4a, 4b, respectively, and the signal is transmitted from the output shaft 7 to the driven machine 8 via the second gear 6. 9a, 9b, 1
0a, 10b, 11a, 11b, 12a, 12b
are each a bearing.

In a gear device having such a structure, since the input is branched and transmitted to several gears 3a, 3b, 5a, 5b, each of the branched gears 3a, 3b, 5a,
It was necessary to provide a load equalization function for absorbing manufacturing errors and assembly errors of the gear 5b and equally distributing the load to each of the branch gears 3a, 3b, 5a, and 5b.

In the one shown in FIG. 1, the branch gears 3a, 3b, 5a are made by utilizing the torsional displacement of the torsion shafts 4a, 4b provided through the shaft holes of the hollow second gears 5a, 5b. , 5b are equally distributed.

However, according to this method, in order to obtain a predetermined torsional displacement, it is necessary to
The second pinions 5a, 5b are made hollow, and the torsion shafts 4a, 4b are provided therein. Furthermore, the torsion shaft 4
a, 4b, the first gears 3a, 3b and the second pinions 5a, 5b are mounted on separate bearings 9a, 9, respectively.
It becomes necessary to support it with b, 10a, and 10b. For this reason, there was a drawback that the face-to-face dimension A could not be shortened. Further, the diameter of the second pinions 5a, 5b cannot be made small, which has been an obstacle to the recent trend of downsizing and weight reduction of gear devices employing carburized gears.

The present invention has been made to eliminate these drawbacks of conventional locked train gear systems.

FIG. 2 shows a gear showing an embodiment of the present invention.
In FIG. 1 showing an example of the conventional type, the first gear 3
These are gears corresponding to gears a and 3b, and in this invention, as shown in FIG. 2, the conventional torsion shaft 4
a, 4b, gear rim 13 and gear boss 14
The purpose is to reduce the size and weight of the gear device by using a disc spring set 15 installed between the two.

The present invention will be explained in detail below.

FIGS. 2, 3, and 4 show an embodiment of the gear 23 of the present invention. The gear rim 13 is fixed to both side surfaces of the gear rim 13 and has a sleeve 17 provided on the outer periphery of the gear boss 14 by support rings 16a and 16b having a cylindrical portion on the inner periphery.
It is rotatably supported by a and 17b.

On the other hand, a plurality of disc spring sets 15 are tightened inside the gear rim 13 with reamer bolts 18. In the box 15a of the disc spring set 15,
A disc spring 19 having a strength commensurate with the torque to be transmitted by the gear is incorporated in the circumferential direction, and a disc spring holder 20, 21 having a spherical seat is installed in the direction of the gear boss 14 from inside the box 15a. Together with the extending special key 22, it constitutes a disc spring set 15. That is, as shown in FIG. 4, in the box 15a of the disc spring set 15, disc spring retainers 21 and 20 and disc springs 19 are mounted on both sides of the tip of the special key 22 arranged in the radial direction at the center. Arranged in the circumferential direction. The other end of the special key 22 is fitted to the outer periphery of the gear boss 14, and is connected to the disc spring 19.
The structure is such that torque is transmitted between the gear rim 13 and the gear boss 14 via the gear rim 13 and the gear boss 14.

Therefore, when transmitting torque from either the gear rim 13 or the gear boss 14 to the other, a torsional displacement corresponding to the amount of deflection of the disc spring 19 will occur.

In this way, in the present invention, by adopting the disc spring 19 for the gear 23, it is possible to transmit a large amount of torque with a small size, and by variously changing the thickness and number of disc springs, it is possible to transmit a large amount of torque. The required torque and torsional displacement can be easily obtained. In addition, by providing spherical seats on the disc spring retainers 20 and 21, torque transmission can also be performed smoothly.

In addition, in the present invention, the gear rim 13 is fixed to both side surfaces of the gear rim 13, and the sleeves 17a, 17b provided on the outer periphery of the gear boss 14 are rotated by support rings 16a, 16b having cylindrical parts on the inner periphery. Since it is movably supported, it has a bearing structure with a sliding surface, and the radial position of the gear rim 13 can be easily maintained accurately at all times. Therefore,
The gear accuracy can be maintained sufficiently, and it can also be used as a precision gear.

Furthermore, if the gear 23 of the present invention is used in place of the conventional first gears 3a, 3b shown in FIG. 1, the long torsion shafts 4a, 4b, the hollow second pinion 5a, 5b is no longer needed,
A normal solid pinion can be used as the second pinion 5a, 5b, and the torsion shaft 4a,
4b can be replaced by a regular short shaft,
The bearings 10a, 10b that pivotally support a portion of the large second pinions 5a, 5b may also be replaced with bearings that pivotally support a small gear shaft. By connecting the first gears 3a, 3b and the second pinions 5a, 5b with an integral shaft, bearings 9b, 10 between them
a is also no longer necessary. Then, as shown in FIG. 5, each gear is arranged so that the axial center of the first pinion 2 is shifted from the axial center of the second gear 6 and the output shaft 7, so that the bearing 12a does not hit the gear 23. If you keep it,
The gear 23 and the second gear 6 are removed by the thickness of the bearing 12a.
can be made closer to each other, and the face-to-face dimension A shown in FIG. 1 can be made smaller by that amount.

As described above, by using the present invention, it is possible to evenly distribute the load on the branch gear without using a torsion shaft as in the conventional type, so the bearings 9b and 10a in FIG. 1 can be omitted. 2
Since the pinions 5a and 5b also do not need to be hollow, the locked train gear device can be configured extremely compactly.

[Brief explanation of the drawing]

Fig. 1 is a plan view (partially sectional view) showing a conventional locked train gear device, Fig. 2 is a vertical sectional view showing an embodiment of the present invention, and Fig. 3 is a -
4 is a cross-sectional view at the center of the disc spring set portion, and FIG. 5 is a diagram of a locked train gear device using the gear of the present invention, which is shown at - in FIG. 1.
FIG. 3 is a side view corresponding to a line arrow view. 13...Gear rim, 14...Gear boss, 15...
...Disc spring set, 16a, 16b...Support ring, 1
7a, 17b...sleeve, 18...reamer bolt, 19...disc spring, 20, 21...disc spring holder, 22...special key, 23...gear.

Claims (1)

[Scope of utility model registration request] A gear rim is provided on the outer periphery of the gear boss at a predetermined interval corresponding to the height of the special key, and the special keys are provided at several locations in the center of the outer peripheral surface of the gear boss so as to face the special key in the radial direction. A disc spring holder having a spherical seat and several disc springs are provided between both sides of the tip in the circumferential direction and the box of the disc spring set provided on the inner circumference of the gear rim, and the gear rim is attached to the gear rim. A sleeve provided on the outer periphery of the gear boss is rotatably supported by support rings fixed to both side surfaces and having a cylindrical part on the inner periphery, and a desired distance between the gear boss and the gear rim is created by selecting the constant of the disc spring. A gear configured to provide torsional displacement.