A swing motor for narrow spaces

Abstract

The invention relates to a swing motor for narrow spaces, belonging to the field of hydraulic transmission. A gear shaft in the front-rear direction and an upper rack and a lower rack in the left-right direction meshing with the gear shaft are arranged in the casing of the swing motor; each rack is provided with four sealing cavities, and the four sealing cavities are set in two groups It is divided into two groups: left and right; plungers are fixedly connected to the left and right sides of the casing, and the plunger seals are inserted into the one-to-one corresponding sealing chambers on the same side; The oil ports on the opposite sides of the upper and lower racks are respectively provided with oil ports that communicate with the oil passages of the same side of the plunger; the oil ports on the opposite sides of the upper rack and the lower rack are simultaneously fed with pressure oil, which enters the connected sealing cavity through the oil passage of the plunger to drive the upper gears. The rack and the lower rack move in the same direction along the plunger, thereby driving the gear shaft to rotate. The movement stroke of the rack almost completely coincides with the length of the plunger, which shortens the movement direction of the rack and can be used in narrow spaces. The plunger provides a guide to prevent the rack from tilting along the width of the tooth.

Description

technical field [0001] The invention belongs to the field of hydraulic transmission, and relates to a swing motor for narrow spaces. Background technique [0002] Swing motor (also known as swing cylinder) is a common actuator in hydraulic transmission, mainly used to achieve a limited angle of rotation or swing. In the prior art, there are two types of technologies: the upper and lower single rack structure, the asymmetric drive, the upper and lower double rack structure, and the symmetrical drive: [0003] (1) Upper and lower single rack structure, asymmetric drive (see patent application number 200920096087.1, 201320343885.6) [0004] This type of swing cylinder has a rack on the upper and lower sides that mesh with the middle gear, and both racks can reciprocate left and right. The two ends of the rack are provided with cylinder pistons. Generally, one of the racks is driven by hydraulic pressure to move actively, and the active rack rotates through the meshing drive g...

AI Technical Summary

Problems solved by technology

[0012] In view of this, the object of the present invention is to provide a swing motor used in narrow spaces to solve the problem of limited use of space due to the large size along the rack movement direction of the traditional cylinder-piston structure

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