Harmonic rack-and-gear drive with intermediate links in form of wedges

FIELD: machine building.

SUBSTANCE: harmonic rack-and-gear drive with intermediate links in the form of wedges includes housing (1), rack (2), wedge movement device (4) orthogonal to the rack, which consists of shaft (6) and flat cams (8) installed on it along its axis through screw line. Diaphragm (11) is installed between housing and wedges. Rack has the possibility of being moved in guides of housing parallel to shaft axis. Brolling bearings (9) are installed in wedges with possibility of direct interaction of their inner rings with working surfaces of flat cams (8). Rollers (10) are installed in the rack with constant pitch and with possibility of being rotated about their axes. Rollers interact with wedges subsequently displaced in phase relative to each other only in straight-line sections of their back-and-forth movements.

EFFECT: uniform tractive force on rack, and rigid drive.

3 dwg

 

The invention relates to mechanical engineering and can be used to create transport and technological modules, Autonomous devices translational movement of the working bodies and machines.

Known wave gear rack with intermediate links in the form of wedges (USSR author's certificate No. 10433392, IPC F16H 19/04, 1983), designed for unlimited stroke Reiki by converting rotational motion into translational, containing the rack and the device for moving the wedges orthogonal to the rail, made in the form of a shaft and placed along the axis of the latter along a helical line flat Cam profiles are deployed to the angle φ=360°/z, where φ is the number of wedges. Installation step wedges tkin the grooves of the gear more step of teeth Reiki tpthe value of Δt=tk-tp=tp/z, a number of wedges z made such that the teeth of the slats simultaneously interacted with some of them. To ensure the linearity of movement of the rack on relevant parts of chart movement of the wedges sites Cams interacting with wedges defined by the spiral of Archimedes. Force closure wedges with Cams is effected by means of springs.

The disadvantages of this transmission are variable contact area of the teeth of the rack and wedges, h is about leads to uneven traction on the rail, the rigidity of the transmission, and the impossibility of entering the translational motion in an isolated space.

Also known wave gear with intermediate links in the form of wedges (RF patent No. 2309310, IPC F16H 21/16, 2007), intended for the transmission of motion from one environment to another, containing the rack and the device consisting of a shaft and designed for orthogonal movement of the wedges to the rail, made with the possibility of travel guides and related sealing membrane. On the shaft along its axis along a helical line installed bushing eccentrically relative to the axis of the shaft. The working parts of the wedges, interacting with the rail, made in the form of a multipoint combs. Bearings mounted on the bushing eccentrically relative to the axis of the shaft with the possibility of their direct interaction with the supporting surface of the wedge and the surface of the spring bars attached to the wedges with the possibility of a power circuit contact ball bearings with wedges.

The disadvantages of such transfer are uneven pulling force on the rail, the rigidity of the transmission caused by the variable area of the interacting contact surfaces of the teeth of the wedges and Reiki.

The technical result of the invention is the uniform traction on the rail, the rigidity of the transmission.

The task is to solve the technical result is achieved by the fact that in the wave pinion with intermediate links in the form of wedges, comprising a housing, a rail, a device for moving the wedges orthogonal to the rail, consisting of a shaft and installed it along its axis at a helix Cams, bearings and membrane installed between the wedges and the housing, the rack is arranged to move in the guide housing parallel to the axis of the shaft according to the invention the Cams are made flat, wedges installed bearings with the possibility of direct interaction of their inner rings with work surfaces flat Cams, and rake set with spaced with the possibility of rotation around the axes of the rollers and with the possibility of their interaction with the wedges, sequentially shifted in phase relative to each other only on the straight parts of their reciprocating movement.

The proposed wave rack and pinion transmission provides continuous linear contact several wedges with rollers on the rail as it moves, forming a kinematic pair rolling. All this ensures a uniform pulling force on the rail, the rigidity of the transfer.

Figure 1 shows the wave gear rack (General view); figure 2 - section a-a in figure 1; figure 3 diagrams the movement of the wedge relative to the roller rail.

Wave gear rack with intermediate links in the form of wedges includes (see figure 1, 2) case 1, rail 2, is installed in the guide 3, and a device for moving the wedges 4 in the guide rails 5 of the housing 1 is orthogonal to the rail 2, consisting of a shaft 6 mounted in support bearings 7, and placed it along its axis along a helical line flat Cams 8. The wedges 4 are installed bearings 9 with the possibility of direct interaction of their inner rings with work surfaces flat Cams 8. The rail 2 is installed with a fixed step and with the possibility of rotation around the axes of the rollers 10, which interacts with the wedges 4, between which and the casing 1 is installed membrane 11. The power circuit of each of the Cam 8 with the bearing 9 of the wedge 4 is carried out by means of a spring 12 mounted in the hole of the wedge 4 and the grooves of the housing 1.

The working surface is flat Cams 8, interacting with bearings 9, is arranged to move the wedges 4 in accordance with figure 3.

Wave gear rack with intermediate links in the form of wedges is as follows.

When the rotation shaft 6 of the Cams 8, interacting with bearings 9, move the wedges 4 in accordance with figure 3. On sections I-II and VIII-0 diagram (figure 3) wedges 4 remain stationary. On the plot is the site II-III chart wedges 4 with installed bearings 9 are moved in the guide rails 5 orthogonal to the rail 2, accelerating to speed. On rectilinear section III-IV chart wedges 4 interact with the rollers 10, move the rail 2 in rails 3 with the set speed. Upon further rotation of the shaft 6 wedges 4 without interfering with the rollers 10, and slow its movement in the guide rails 5 of the housing 1 to a complete stop at the point V of the graph. With continued rotation of the shaft 6 on the plot chart V-VI is the acceleration of the wedge 4 to the set speed during the reverse movement from Reiki. Then the wedge 4 is moved further, interacting in straight VI-VII chart roller, choosing a backlash in the transmission, and then on the plot chart VII-VIII slows down its movement to a complete stop at the point VIII. Move the wedges 4 in accordance with figure 3 is shifted in phase relative to each other. For one full rotation of the shaft 6 all wedges will make one cycle of reciprocating movement in guides 5 and moves the rail 2 in the guide 3 one step installation of the rollers 10.

Wave gear rack with intermediate links in the form of wedges, comprising a housing, a rail, a device for moving the wedges orthogonal to the rail, consisting of a shaft and installed it along its axis at a helix Cams, bearings and membrane installed between the wedges and the housing, the rail wypolnena can move in the guide housing parallel to the axis of the shaft, characterized in that the Cams are made flat, wedges installed bearings with the possibility of direct interaction of their inner rings with work surfaces flat Cams, and the rail is installed with a constant pitch with the possibility of rotation around the axes of the rollers and with the possibility of their interaction with the wedges, sequentially shifted in phase relative to each other only on the straight parts of their reciprocating movement.



 

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