SU1537918A1 - Two-speed wave-type gearing - Google Patents

Abstract

The invention relates to general engineering, in particular to mechanical wave transmissions used in the mechanisms of machines, machines and devices, which require automatic switching of the speed of rotation of the actuating shaft. The aim of the invention is to expand the functionality by providing an automatic switch to accelerated displacement mode when the load is idling, for which the free-running mechanism 8 is installed between the housing 1 and the rigid wheel 3, and its fork 13 is connected to the drive shaft 4 through the limit torque coupling 11 and gearing. 2 hp f-ly, 2 ill.

Description

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The invention relates to general engineering, in particular to mechanical wave transmissions used in the mechanisms of machines, machines and devices, which require automatic switching of the speed of rotation of the actuating shaft.

The aim of the invention is to enhance the functionality of two-speed wave transmission by providing automatic switching to accelerated displacement mode at no load.

FIG. 1 schematically shows a two-speed wave transmission; on

FIG. 2 - a fragment of the transmission section.

The transmission includes body 1, flexible 2 and rigid 3 wheels, driving D and driven 5 shafts, 6 wave generator, drive gear 7 on the drive shaft, and a free wheeling mechanism 8, made in the form of an overrunning double-acting coupling and installed between housing 1 and hard wheel 3, and the mechanism of accelerated movements. The latter includes an additional shaft 9, on which a gear wheel 10 is mounted in series, which interacts with the drive gear 7. a torque limit clutch 11 and a driven gear 12 for engagement with the fork 13 of the free-wheeling mechanism 8. Magnetic hysteresis is used as the clutch 11 for the limiting moment.

Wave transmission works as follows.

At low loads on the driven shaft 5, for example when idling, the rotation of the drive shaft is transmitted to the wave generator 6 and the drive gear 7. The rotating wave generator 6 creates a traveling wave of deformations in the flexible wheel 2, which with a small difference in the number of teeth of the engaging flexible 2 and A hard 3 wheel leads to a wave transformation of the rotational motion. With a slower angular speed, the flexible wheel 2 rotates relative to the rigid wheel 3 in the direction opposite to the direction of rotation of the drive shaft. The movement from the gear 7 through the gear wheel 10, the shaft 9, the clutch 11 limit torque, gear 12 is transmitted to the fork 13 of the free-wheeling mechanism 8. From the plug 13, the rotation is transmitted to the inner ring of the mechanism 10.

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A freewheel mounted on a rigid wheel 3 is attached. The rigid wheel 3, rotating with the fork 13, carries along the flexible wheel 2, which is in gearing with it. The flexible wheel 2 rotates relative to the wave generator 6. If the generator contains a flexible bearing, the flexible wheel rotates with rolling friction along with its outer ring relative to the rolling bodies of the inner ring. Together with the flexible wheel 2, the driven shaft 5 rotates, while its angular speed is determined by the speed of the drive shaft and the gear ratio of gears 7, 12 and wheel 10.

When the load on the driven shaft 5 increases during the working stroke, it is transmitted through the flexible wheel 2 to the rigid wheel 3, from it to the inner race of the free wheel mechanism 8. This leads to the wedging of the rolling elements of the free-wheeling mechanism between the inner and outer yoke fixed in the housing 1. The rigid wheel 3 stops relative to the housing 1 and absorbs the entire external load. The fork 13 of the free wheeling mechanism 8 remains loaded by the moment from the gear 12 and the coupling 11, however, this moment is not enough to wedge the rolling bodies in the free wheeling mechanism 8. Because of this, the clutch 11 of the limiting moment slips.

When the load of the working stroke is reduced to the value when the moment on the fork 13, which is created by the constant limit clutch 11, is enough to wedge the rolling bodies of the free-running mechanism 8, the wave transmission automatically switches from the mode of the running to the accelerated displacement mode. The transmission operates in any direction of rotation of the drive shaft.

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The use of the torque limit clutch allows the automatic transfer of the wave transmission from the working stroke mode (under load) to the accelerated displacement mode (at idle speed) and, vice versa, depending on the ratio of the torque limit clutch setting value and the effective load on the driven shaft.

Claims (3)

1. A two-speed wave transmission, comprising a housing, a rigid and flexible wheel, driving and driven shafts, a wave generator, an accelerated movement mechanism and a free-wheeling mechanism connected to it through a fork, which means that in order to extend the functionality providing automatic switching to the accelerated displacement mode when the load is idling, the transmission is equipped with a drive gear mounted on the drive shaft, the accelerated displacement mechanism has additional five a shaft with a gear wheel connected in series to interact with the drive gear, a torque limiting clutch and a driving gear for engagement with the fork, and a free wheeling mechanism is installed between the housing and the hard wheel. 2. Transfer of pop. 1, characterized in that the free-wheeling mechanism is designed as a double-sided overrunning clutch. 3. Transmission pop. 1, which differs from the fact that magnetic hysteresis is used as the clutch of the limiting moment. Compiled by S. Kotelnikov Editor A. Shandor Tehred M. Didyk Order 157 Circulation 87 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, K-35, Raushsk nab. D. V5 Yiwu FIG. g Proofreader S. Shekmar