RU2433320C1 - Rotation to reciprocation converter - Google Patents

Abstract

FIELD: mechanical engineering. ^ SUBSTANCE: rotation to reciprocation converter comprises a profile roller rotating with respect to a stationary housing on a side surface of which there are quasicircular grooves of the set configuration which accommodate rollers arranged perpendicularly to a profile roller, matched with the grooves and being part of an coaxial pusher reciprocating with respect to the housing when the rollers move along the grooves mutually displaced at 2Ç/n where n is a number of grooves. The rollers represent half-axle disks mounted on bearing supports arranged in radial cylindrical pusher samples turnable to orientate the disks with respect to the grooves. The profile roller is movable longitudinally with respect to the housing. ^ EFFECT: higher reliability. ^ 2 cl, 3 dwg

Description

The invention relates to mechanisms for converting rotational motion into reciprocating.

Widely used crank mechanism, which converts rotational motion into reciprocating, characterized by simplicity, manufacturability and high reliability. However, it has such disadvantages as the imbalance of translationally moving and rotating masses, which leads to an increase in the mass of the mechanism, the presence of “dead spots”, the significant space required for movement, and the inability to reproduce the required law of motion of the slider (piston).

Known cam spatial mechanism for converting reciprocating motion into rotational or rotational motion into reciprocating motion (US patent No. 3792616, F16H 25/12, 02/19/1974), including having the possibility of reciprocating or rotational movement relative to the stationary body, for example, a cylindrical cam or a pusher, on the lateral surface of which are made curved grooves of a given configuration, in which, for example, tapered rollers are placed perpendicular to the axis of the cam, respectively which are in the form of grooves and belonging to a coupling located coaxially with the cam (pusher or shaft), which has the possibility of rotational or reciprocating motion relative to the housing when moving the rollers along the grooves of the cam (pusher).

Its disadvantage is that the application of loads to the mechanism is asymmetric about the axis, which necessitates the use of additional supports to relieve lateral loads. In addition, the magnitude of the load on the pusher is limited by the bearing capacity of the roller axis and the friction losses are large, which reduces the efficiency of the mechanism.

Closest to the proposed device for most coinciding features is a mechanism for converting reciprocating motion into rotational or rotational into reciprocating (options) (patent RU No. 2115851, IPC 6 F16H 25/12, publ. 07.20.1998), including having the possibility of rotational movement relative to the stationary body, for example, a cylindrical cam, on the lateral surface of which are made curved grooves of a given configuration, in which, for example, are placed perpendicular to the axis of the cam tapered rollers corresponding to the shape of the grooves and belonging to a pusher arranged coaxially with the cam, having the possibility of reciprocating motion relative to the housing when moving the rollers along the cam grooves, while the grooves on the side surface of the cam are made different in depth or width and are offset relative to each other by 2π / n, where n is the number of grooves.

A significant drawback is the limitation of the load on the cam bearing capacity of the axis of the roller. In places where the grooves intersect, unauthorized movement of the roller into the intersected groove is possible, which will cause the rollers to skew and break the tool.

Technical tasks - creating a device for converting rotational motion into reciprocating with the possibility of loading on a cam, independent of the bearing capacity of the roller axis, increasing the reliability of the device.

The technical problem is solved by a device for converting rotational motion into reciprocating, including a cylindrical cam having the possibility of rotational motion relative to the stationary body, on the lateral surface of which curved grooves of a given configuration are made, in which rollers corresponding to the groove shape and belonging to located coaxially with the grooves are placed perpendicular to the cam axis cam pusher having the possibility of reciprocating motion relative to the housing when the movement of the rollers in the grooves of the cam, offset relative to each other by 2π / n, where n is the number of grooves.

What is new is that the rollers are made in the form of disks with half shafts mounted in bearings, which are placed in radial cylindrical pusher samples with the possibility of their rotation to orient the disks relative to the cam grooves, while the cylindrical cam is made with the possibility of longitudinal movement relative to the stationary body, and grooves - grooves of the reverse and cam stroke can be performed with different steps.

Figure 1 shows a device for converting rotational motion into reciprocating; figure 2 is a section aa of figure 1, figure 3 is a section bb of figure 2.

A device for converting rotational motion into reciprocating comprises a stationary housing 1 (Fig. 1), a cylindrical cam 2 provided with curved inclined grooves of the working stroke 3 and the reverse 4, in which disks 6 with half shafts 7 are placed perpendicular to the axis 5 of the cam 2 6 with half shafts 7 (FIG. 2, FIG. 3) are mounted in supports 8 and placed in radial cylindrical samples 9 of the pusher 10. The supports 8 are rotatable to orient the disks 6 with the half shafts 7 relative to the grooves 3 (FIG. 1), 4, while 6 discs have such a bunk the actual diameter 11 (FIG. 2), in which it does not go out of interaction with the grooves 3 (FIG. 1), 4, along which it rolls at the intersection of the grooves of the working 3 and the reverse 4. The curved grooves of the working 3 and reverse 4 can be performed with different steps to create different speeds during the reciprocating movement of the pusher 10.

The device converts the rotational movement of the cylindrical cam 2 relative to the stationary housing 1 into the upward movement of the pusher 10 by rolling the disks 6 with the axle shafts 7 oriented along the inclined grooves of the reverse stroke 4 of the cylindrical cam 2, while the possibility of rotation of the pusher 10 relative to the housing 1 is excluded (for example, connection "key - longitudinal groove", etc., not shown in the drawing). When the disks 6 reach the intersection of the 12 inclined grooves of the working stroke 3 and the reverse stroke 4, that is, the position when the pusher 10 is in its highest position, the disks 6 with the half shafts 7 are oriented to the grooves of the working stroke 3, due to the possibility of turning the supports 8 placed in the radial cylindrical samples 9 of the pusher 10, which begins to move down. Further downward movement of the pusher 10 will bring it to its original position, while the cylindrical cam 2 has the possibility of additional longitudinal movement relative to the stationary housing 1 to offset, if necessary, the reciprocating movement of the pusher 10 in the housing 1.

The proposed device for converting rotational motion into reciprocating provides loading on the cam, independent of the bearing capacity of the drive axles, since the axial load from the cam on the pusher is uniformly transmitted through the disks experiencing shear stresses. Improving the reliability of the device is ensured by the outer diameter of the disk, at which it does not go out of interaction with the grooves along which it rolls at the intersection of the working and return grooves, and the rotation of the supports in radial cylindrical samples provides the necessary angle for the orientation of the disks along the grooves.

Claims (2)

1. A device for converting rotational motion into reciprocating, including a cylindrical cam having the possibility of rotational motion relative to the stationary body, on the lateral surface of which curved grooves of a given configuration are made, in which rollers corresponding to the shape of the grooves and belonging coaxially with the cam are placed perpendicular to the axis of the cam a pusher having the possibility of reciprocating motion relative to the housing when moving the rollers along the groove cam displaced relative to each other by 2π / n, where n is the number of grooves, characterized in that the rollers are made in the form of disks with half shafts mounted in bearings, which are placed in radial cylindrical pusher samples with the possibility of their rotation to orient the disks relative to the grooves cam, while the cylindrical cam is made with the possibility of longitudinal movement relative to the stationary body. 2. The device according to claim 1, characterized in that the said grooves — the grooves of the return and cam stroke are made with different steps.

Images