EA021035B1 - Harmonic rack-and-gear drive with intermediate links in form of wedges - Google Patents

Abstract

The invention relates to machine building and can be used in developing transport and technological modules, facilities of autonomous movement of working organs of machines and tools. A harmonic rack-and-gear drive with intermediate links in the form of wedges (4) includes a housing (1), a rack (2) and a device for moving wedges (4) orthogonal to the rack (2), which consists of a shaft (6) and flat cams (8) installed on it along its axis through screw line, rolling bearings (9) and a diaphragm (11) installed between the housing (1) and wedges (4), the rack (2) is embodied of being moved in guides of housing parallel to shaft axis (6). The cams (8) are performed flat, and rolling bearings (9) are installed in wedges (4) with possibility of direct interaction of their inner rings with working surfaces of flat cams (8), projections of which are performed with possibility of providing straight-line movement of the wedges (4) at sections (III-IV, VI-VII) of their interaction with rollers (10) of the rack (2) which are installed in the rack (2) with constant pitch and with possibility of being rotated about their axes, wherein the wedges (4) are performed with possibility of subsequent displacement in phase relative to each other only in straight-line sections (III-IV, VI-VII) of their back-and-forth movements, providing a contact of the wedges (4) with two sides of rollers (10) cylindrical surfaces simultaneously. The technical effect provides uniform tractive force on the rack and rigid drive.

Description

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

Known wave transmission with intermediate links in the form of wedges (RF patent No. 2309310, IPC Р16Н 21/16, 2007), designed to transfer movement from one medium to another, containing a gear rack and a device consisting of a shaft and designed for orthogonal movement wedges to the rail, made with the possibility of their movement in the guides and associated with a sealing membrane. On the shaft along its axis along the helix, bushings with an eccentricity relative to the axis of the shaft are installed. The working parts of the wedges interacting with the rail are made in the form of multi-tooth combs. The rolling bearings are mounted on bushings with an eccentricity with respect to the axis of the shaft with the possibility of their direct interaction with the supporting surface of the wedges and the surface of the spring-loaded slats mounted on the wedges with the possibility of providing power closure of the contact of the rolling bearings with the wedges.

The disadvantages of this transmission are uneven traction on the rail and the rigidity of the transmission caused by the variable area of the interacting contact surfaces of the teeth of the wedges and the rack.

Also known is the wave rack and pinion transmission with intermediate links in the form of wedges (USSR author's certificate No. 10433392, IPC Р16Н 19/04, 1983), designed for unlimited travel of the rack, containing a gear rack and a device for moving the wedges orthogonally to the rail, made in the form a shaft placed along the axis of the latter along a helical line of flat cams, the profiles of which are turned at an angle φ = 360 ° / ζ, where φ is the number of wedges. The step of installing wedges 1 _k in the grooves of the transmission housing is greater than the pitch of the teeth of the rack 1 _p by Δΐ = φ-ΐ _ρ - = ΐ _ρ / ζ, and the number of wedges ζ is taken so that some of them interact with the teeth of the rack at the same time. To ensure linearity of the movement of the slats in the corresponding sections of the wedge diagram, sections of the cams interacting with the wedges are outlined in a spiral of Archimedes. The force closure of the wedges with the cams is carried out using springs.

The disadvantages of this transmission are the variable contact area of the teeth of the rail and wedges, which leads to uneven traction on the rail and the rigidity of the transmission and the inability to enter translational motion into an isolated space.

The technical result of the invention is the uniformity of traction on the rail and the stiffness of the transmission.

The problem for solving the technical result is achieved by the fact that in a wave rack and pinion transmission with intermediate links in the form of wedges (4) containing a housing (1), a rail (2) and a device for moving wedges (4) orthogonal to the rail (2), consisting of shaft (6) and cams (8) installed on it along its axis along the helix, rolling bearings (9) and a membrane (11) installed between the wedges (4) and the housing (1), the rail (2) is movable in the guides of the housing parallel to the axis of the shaft (6), new is that the cams (8) are made flat, and in the wedges (4), rolling bearings (9) are installed with the possibility of direct interaction of their inner rings with the surfaces of flat cams (8), the working profiles of which are made with the possibility of ensuring the linear movement of the wedges (4) in the sections (участ-ΐν, U1-UP ) their interaction with the rollers (10) of the rack (2), which are installed in the rack (2) with a constant step and with the possibility of rotation around their axes, while the wedges (4) are made with the possibility of successive phase displacement relative to each other only on rectilinear uch stkah (ΙΙΙ-Ιν, νΙ-νΙΙ) vozvratnopostupatelnyh their movements, with the possibility of contact of the wedges (4) simultaneously with the two sides of the cylindrical surfaces of the rollers (10).

The proposed wave rack and pinion transmission provides constant linear contact of several wedges with rollers on the rail during its movement, forming kinematic rolling pairs. All this provides uniform traction on the rail and transmission stiffness.

In FIG. 1 shows a wave rack and pinion transmission (general view); in FIG. 2 is a section AA in FIG. one; in FIG. 3 is a diagram of the movement of the wedge relative to the rail rolls.

The wave rack and pinion transmission with intermediate links in the form of wedges contains (see Fig. 1, 2) a housing 1, a rail 2 installed in the guides 3 and a device for moving the wedges 4 in the guides 5 of the housing 1 orthogonal to the rail 2, consisting of a shaft 6, installed in the thrust bearings 7, and placed on it along its axis along the helical line of the flat cams 8. In the wedges 4, rolling bearings 9 are installed with the possibility of direct interaction of their inner rings with the working surfaces of the flat cams 8. In the rail 2 are installed with a constant With the first step and with the possibility of rotation around their axes, the rollers 10 interacting with the wedges 4, between which a membrane 11 is mounted 11. The force closure of each of the cams 8 with the bearing 9 of the wedge 4 is carried out using a spring 12 installed in the hole of the wedge 4 and housing grooves 1.

The working profiles of the surfaces of the flat cams 8 interacting with the bearings 9 are arranged to move the wedges 4 in accordance with the diagram of FIG. 3.

- 1 021035

Wave rack and pinion with intermediate links in the form of wedges works as follows.

When the shaft 6 rotates, the cams 8, interacting with the bearings 9, move the wedges 4 in accordance with the diagram of FIG. 3. In sections Σ-Π and USh-0 of the diagram (Fig. 3), the wedges 4 remain motionless. In section P – W, diagrams of wedges 4 with bearings 9 installed in them move in guides 5 orthogonally to rail 2, accelerating to a set speed. On the straight section of the SH-GU diagram wedges 4 interact with the rollers 10, move the rail 2 in the guides 3 with a set speed. With further rotation of the shaft 6, the wedges 4, without interacting with the rollers 10, slow down their movement in the guides 5 of the housing 1 to a complete stop at point V of the diagram. With the continuation of the rotation of the shaft 6 on the plot of the diagram V-VI, the wedge 4 is accelerated to the set speed during reverse movement from the rail. Then the wedge 4 moves further, interacting on the straight section of the VI-VII diagram with the roller 7, choosing a clearance in the transmission, and then on the plot of the diagram VII-VIII slows down to a complete stop at point VIII. The movement of the wedges 4 in accordance with the diagram of FIG. 3 are out of phase with respect to each other. For one complete rotation of the shaft 6, all the wedges will make one cycle of reciprocating movement in the guides 5 and move the rack 2 in the guides 3 by one step of installing the rollers 10.

Claims (1)

CLAIM Wave rack with intermediate links in the form of wedges (4), comprising a housing (1), a rail (2) and a device for moving wedges (4) orthogonal to the rail (2), consisting of a shaft (6) and installed on it along axes along the helix of the cams (8), rolling bearings (9) and a membrane (11) installed between the wedges (4) and the body (1), the rail (2) is movable in the body guides parallel to the shaft axis (6), characterized in that the cams (8) are flat, and rolling bearings (9) are installed in the wedges (4) with direct interaction of their inner rings with surfaces of flat cams (8), the working profiles of which are made with the possibility of ensuring the straight-line movement of wedges (4) in areas (W-PG, VI-VII) of their interaction with rollers (10) of the slats (2), which installed in the rail (2) with a constant pitch and with the possibility of rotation around their axes, while the wedges (4) are made with the possibility of successive phase shift relative to each other only in straight sections (W-PG, VI-VII) of their reciprocating displacements, with possible Strongly contact wedge (4) simultaneously with the two sides of the cylindrical surfaces of the rollers (10).