SU949260A1 - Ratchet-and-pawl gear with internal engagement - Google Patents

Description

(54) SNIP TRANSMISSION WITH INTERNAL SNAPPING

one

The invention relates to mechanical engineering and can be used in devices where intermittent motion transmission is necessary.

Known ratchet transmission with internal gearing, containing the leading and driven shafts installed on the last ratchet wheel, interacting with at least one dog, and the drive device of the dog.

In this transmission, the drive device of the pawl is made in the form of a system of kinematically connected levers fixed eccentrically relative to the axis of the drive shaft and interconnected with the spring-loaded pawl 1.

A disadvantage of the known transmission is the complexity of the design due to the large number of intermediate and interconnected links.

The aim of the invention is to simplify the construction of the transfer.

This goal is achieved by the fact that in a ratchet transmission with internal gearing, which contains the drive and driven shafts with the ratchet wheel mounted on the last wheel, which interacts at least.

with one dog and a drive device of dogs, the latter is made in the form of a cam, covering its fixed drum with a window and fixed with one end on the drum with a flat spring interacting through the window with the cam, and the other end with the dog.

FIG. 1 shows a ratchet transmission variant with one dog; in fig. 2 is a section A-A in FIG. one; in fig. 3 shows an embodiment of a ratchet transmission with two dogs.

Ratchet gear includes a drive shaft 1, a driven shaft 2, a ratchet wheel 3 with internal gearing, a pawl 4, seated on an axis 5, rolls 6, and a paw drive device including a cam 7, a fixed drum 8 with a window, connected with a flange 9 c: a housing 10 covering the drum with a ring 11 with a groove, a doggie 4 is placed in the co2Q, and a flat spring 12 fixed at one end on the drum 8 and the other connected to the doggie 4 pressed by the spring 13.

Option ratchet transmission (Fig. 3) includes an additional one spring 14

and the dog 15, and the cam 7 is made four-step.

Ratchet transmission with internal gearing works as follows.

The drive shaft, receiving rotation from the drive, deforms with its cam 7 a flat spring 12, which, distributing, moves along the groove of the ring 11 the pawl 4, which, turning, engages with the ratchet wheel 3, turning it by one tooth. After passing the cam 7, the dog 4 returns to its original position.

Ratchet gear works similarly, except that the additional dog 15, set at an angle of 135 ° to the dog 4, when interacting with a four-stage cam by means of a spring 14, rotates the wheel by one tooth while rotating the drive shaft through 45 °, and thus one turn of the last ratchet wheel is rotated by 8 teeth.

The use of the proposed device in the national household can provide

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significant savings due to simplified ratchet design.

Claims (1)

Invention Formula Ratchet transmission with internal gearing, containing the drive and driven shafts with a ratchet wheel mounted on the last wheel, interacting at least at least one dog, and a paw drive device, characterized in that, in order to simplify the construction, the drive device is made in the form of a cam covering its stationary drum with a window and fixed at one end on the drum with a flat spring interacting through the window with the cam, and the other end - with a dog. Sources of information taken into account in the examination 1. Artobolevsky I. I. Mechanisms in modern technology. - “Science, 1971, vol. II, p. 681, FIG. 1824. / Z