RU2557307C2 - Gearbox with u-shape power element - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to 2K-H gearboxes with two internal engagements for the torque transfer and transformation. The gearbox contains a cylindrical casing, rear cover, face cover with fixed central internal gearwheel, output shaft with movable central internal gearwheel, double external gearwheel with hole. The cylindrical U-shape insert with two open cylindrical holes is installed in hole of the double gearwheel, in one of them (central) the geared shaft is installed, and in the another one - satellite gearwheel. Teeth of the geared shaft are in engagement with teeth of the satellite gearwheel, and satellite gearwheel teeth are engagement with teeth of the internal engagement of the double tooth-wheel. Teeth of the internal engagement of the double tooth-wheel, teeth of the geared shaft and satellite gearwheel additionally using the cylindrical tips of the tooth heads execute function of the journal bearing cage. The wave profile of teeth provides the tooth-wheel rotation during work around the own axis and axis of the central tooth-wheels with set permanent eccentricity. At that teeth are in engagement with each other during the gearbox operation.

EFFECT: improved operating characteristics of the gearbox.

3 cl, 5 dwg

Description

The invention relates to the field of mechanical gears with high gear ratios of increased load capacity with minimal free wheeling.

A known gearbox (see fig. 126 p. 242, [1]), composed of a simple gear and planetary 2K-N. A simple transmission consists of an input gear shaft and a gear, and a planetary gear: a carrier, on the eccentric part of which a double external gear gear rotates with an eccentricity (e) relative to the fixed main axis. A double gear wheel is simultaneously driven by its teeth along the teeth of the fixed central internal gear wheel rigidly connected to the stationary body, and along the teeth of the movable central internal gear gear rigidly connected to the output shaft, the axis of which coincides with the main axis. A planetary gear carrier and a single gear gear are rigidly interconnected. Disadvantages of transmission are: large specific mass and transmission volume (ratio of mass, transmission volume to transmitted power); the difficulty of balancing centrifugal forces, a small number of teeth of a double wheel is at the same time meshed with the teeth of the fixed and movable central wheels, which is the reason for the large free movement of the transmission and low load capacity.

The purpose of the invention is to reduce the specific gravity and volume of the transmission, the optimal solution to the problems associated with balancing the centrifugal forces, increasing the number of teeth of the twin wheels, which are simultaneously meshed with the teeth of the fixed and moving central wheels, to the maximum, thereby reducing the free travel of the transmission and increasing it load ability.

The goal is achieved as follows: the carrier is removed from the dual gear. The teeth are cut on the inner cylindrical hole of the double gear so that on the tops of the teeth there remains a part of the cylindrical surface of the hole, which will play the role of a sliding bearing. A horseshoe-shaped sleeve is inserted into the hole with the possibility of its rotation. The sleeve has two continuous open holes, the axis of one of them coincides with the main axis, and the axis of the second hole is radially offset and equidistant from the cylindrical surfaces of the horseshoe-shaped sleeve and above the specified open hole. An input gear shaft is inserted into the hole, the axis of which coincides with the main axis, and a gear wheel is inserted into the radially displaced hole — a satellite, the teeth of which mesh with the teeth of the gear shaft and with the cut teeth of the double gear. The tops of the teeth of the pinion shaft and the satellite have cylindrical surfaces with diameters equal to the diameters of open holes in the sleeve, respectively, and play the role of sliding bearings. The rotation of the double gear, horseshoe-shaped sleeve and satellite around the main axis causes centrifugal forces, since the centers of mass above the specified parts do not coincide with the main axis. To balance centrifugal forces, balancing holes are drilled in a horseshoe-shaped sleeve, a balancing transverse groove is cut, which is also an unloading groove, since liquid lubricant flows from it from the high-pressure zone to the low-pressure zone, thereby reducing the moment of resistance to rotation. The teeth of the fixed, movable central wheels, dual wheels are made in such a way that they are all engaged (have a contact line) with the closest tooth throughout the transmission. Thus, the load is more evenly distributed over the teeth, and the radial components of the forces acting in the contact zone of the teeth are mutually balanced, increasing the load capacity and reducing: the radial load on the pinion shaft, the gearbox free play (play).

In Fig. 1 shows the proposed gearbox with cuts, in Fig. 2 and Fig. 3 shows the cuts of the gearbox along the lines A-A and B-B, respectively, in Fig. 4 shows a horseshoe-shaped sleeve, in Fig. 5 shows half of the double gear .

The gearbox contains: a stationary cylindrical housing 1, a front end cover 2 with a fixed central gear 2.1, a rear end cover 3, in the central hole of which the output shaft 5 rotates with a disk 5.1 and a movable central gear 5.2. The end caps are fastened to the body with bolts 10. Inside the central gears 2.1 and 5.2 there is a double gear wheel, which consists of two halves 8 and 9, differing from each other only in the number of teeth of external gearing. Halves 8 and 9 are interconnected by means of cams 8.1 and 9.1, which are included in the corresponding grooves 8.2 and 9.2. A double gear wheel can be monolithic (single). Inside the double gear wheel, a horseshoe-shaped sleeve 6 rotates with two open holes, with two balancing holes 6.1 and a balancing unloading groove 6.2. The axis of the double gear and the axis of the horseshoe-shaped sleeve 0.2 is offset from the main axis 0.1 by the eccentricity (e). In the holes of the front end cover and the horseshoe-shaped sleeve, the axis of which coincides with the main axis, the input gear-shaft 4 rotates. In order to reduce the moment of resistance to rotation, the teeth of the gear-shaft have a transverse annular groove for the flow of liquid lubricant from the high pressure zone to the low pressure region. The pinion shaft has a shank 4.1, which rotates in the blind hole 5.3 of the output shaft 5. In the radially displaced open hole of the horseshoe sleeve, the gear wheel - satellite 7, which also has a transverse unloading ring groove for the same purpose as for the pinion shaft. Similar transverse unloading ring grooves have a double gear wheel (8, 9) and a movable 5.2 and fixed 2.1 central gears.

The gearbox operates as follows: rotation from the pinion shaft through the teeth is transmitted to the satellite, which, pushing with its teeth from the internal teeth of the dual gear wheel, which at the same time abuts against the teeth of the fixed central wheel with its external teeth, rotates around its own axis and moves around the circumference around the main axis. The satellite presses the cylindrical tops of its teeth onto the cylindrical surface of the radially displaced open hole of the horseshoe-shaped sleeve and moves it also around the circumference around the main axis. The satellite and the horseshoe-shaped sleeve press the double gear (the teeth of the double gear), (the double gear performs the function of a kind of curly rotating wedge) into the teeth of the movable and stationary central wheels. As a result of the foregoing, a torque is acting on the movable central gear wheel, which rotates the movable central gear and the output shaft rigidly connected to it with an angular velocity lower than the angular velocity of the input gear shaft.

Bibliography

1. V.N. Kudryavtsev "Planetary gears", "Engineering" Publishing House, Moscow 1966 Leningrad.

Claims (3)

1. A gearbox, type 2K-N, with two internal gears for transmitting and transforming the torque of the mechanical forces of rotational motion, comprising a cylindrical body, a rear end cover, a front end cover with a fixed central gear wheel of internal gearing, an output shaft with a movable central gear wheel internal gearing, double gear wheel of external gearing with a hole, characterized in that in order to improve the operational characteristics of the gearbox in the hole of the double gear teeth are cut into internal gears, into which a cylindrical horseshoe-shaped sleeve with two open cylindrical holes is inserted, one of them has a central one, the axis of which coincides with the axis of the central gears throughout the operation of the gearbox, the gear shaft is inserted, and the radially offset relative to the axis of the central gears, an open hole is inserted gear with external gearing - satellite, the teeth of the gear shaft are engaged with the teeth of the satellite and the teeth of the satellite mesh with the cut teeth of the internal gearing of the double gear, the teeth of the internal gear of the double gear, the teeth of the pinion shaft and the satellite additionally using the cylindrical vertices of the tooth heads perform the function of the bearings of the bearings, the wave profile of the teeth of the central wheels and external teeth The dual gear is designed in such a way that allows the dual gear to rotate around its own axis and wok during gear operation the axis of the central gears with a given constant eccentricity, while the teeth mesh with each other / have a contact spot with adjacent teeth, and do not lose the contact spot throughout the entire gear operation, as a result of which the radial forces arising in the places / in the contact points of the teeth are mutually compensated and do not exert radial pressure on the pinion shaft. 2. The gearbox according to claim 1, characterized in that the horseshoe-shaped sleeve has balancing holes and a groove. 3. The gearbox according to claim 1, characterized in that all gear parts have transverse annular hydraulic discharge grooves, and the horseshoe-shaped sleeve has a hydraulic discharge groove.

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