RU2437014C1 - Device for conversion of rotational motion into reciprocal - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device for conversion of rotational motion into reciprocal consists of cylinder pusher (2) with curvilinear crossing slots of specified configuration of direct (3) and reverse (4) stroke, of shaft (10) positioned coaxially with pusher, of disks (5) installed in slots of pusher corresponding to shape of slots and belonging to shaft (10). The slots of the pusher are set off relatively to each other at value 2π/n, where n is number of slots. Axes of disks are located in plane perpendicular to radius of the pusher. The disks are arranged on axes with a gap to facilitate incline for orientation relative to the slots of the pusher at rotation of shaft (10) into one side and change of direction of pusher motion.

EFFECT: increased reliability of device operation.

2 cl, 2 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 reciprocating or rotational movement relative to the stationary body, for example, a cylindrical pusher, on the side surface of which there are curved grooves of a given configuration, in which the about the axis of the pusher are placed, for example, conical rollers corresponding to the shape of the grooves and belonging to a shaft located coaxially with the pusher, which can rotate relative to the housing when the rollers move along the pusher grooves, while the grooves are offset relative to each other by 2 π / n, where n - the number of grooves.

A significant drawback is the limitation of the load on the pusher 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 - the creation of a device for converting rotational motion into reciprocating with the possibility of loading on the plunger, the roller axis independent of the bearing capacity, increasing the reliability of the device.

The technical problem is solved by a device for converting rotational motion into reciprocating, including having a possibility of reciprocating motion relative to the stationary body, a cylindrical pusher with curved intersecting grooves of a given configuration of forward and reverse motion, in which rollers are placed corresponding to the shape of the grooves and belonging located coaxially with the pusher a shaft having the possibility of rotational motion relative to the housing when moving the rollers along the groove pusher, offset relative to each other by 2 π / n, where n is the number of grooves.

What is new is that the rollers are made in the form of disks with axes located in a plane perpendicular to the radius of the pusher, and the disks are placed on the axes with a gap with a tilt for orientation relative to the grooves of the pusher when the shaft rotates in one direction and the direction of movement changes, and the grooves for forward and reverse pusher can be performed in different steps.

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

A device for converting rotational motion into reciprocating comprises a stationary body 1 (Fig. 1), a pusher 2, equipped with curved intersecting grooves of the forward stroke 3 and reverse 4, in which the disks 5 are mounted. The disks 5 (Fig. 2) have such an outer diameter 6, at which they do not get out of interaction with the grooves 3, (Fig. 1) and 4, along which they roll at the intersection of the grooves of the straight 3 and the reverse 4. Diameter 7 (Fig. 2) of the axis 8 located in the recesses 9 shaft 10, less than the diameter of the hole 11 of the disk 5 by an amount required to orient the disk 5 on the axis 8 along the grooves 3 (figure 1) and 4.

The device converts the rotational movement of the shaft 10 relative to the housing 1 in one direction to the upward movement of the pusher 2 in the absence of angular movement of the pusher 2 by rolling the disks 5 oriented along the inclined grooves of the reverse stroke 4 of the pusher 2. When the disks 5 reach the transition point 12 of curved grooves forward stroke 3 and reverse 4, that is, the position when the pusher 2 will be in its highest position, the orientation of the disks 5 is due to the possibility of rotation of the relative but axis 8 on the forward stroke grooves 3 and plunger 2 starts to move downward. Further movement of the pusher 2 down will bring it to its original position. The constant rotation of the shaft 10 in one direction of rotation leads to the reciprocating movement of the pusher 2 by the magnitude of its stroke. From the value of the cutting radius 13, the angle of elevation of the grooves 3, 4, as well as the number of revolutions of the shaft 10, the speed of longitudinal movement of the pusher 2 depends.

The proposed device for converting rotational motion into reciprocating provides loading on the shaft, independent of the bearing capacity of the axis of the disk, since the axial load from the shaft on the plunger is uniformly transmitted through the disks experiencing shear stresses, and the shear line increases with increasing outer diameter of the disk. Improving the reliability of the device is ensured by the increased 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 grooves of the forward and reverse. The difference in the diameters of the axis of the disk and the holes in the disk provides the necessary angle of rotation to orient the disk along the grooves.

Claims (2)

1. A device for converting rotational motion into reciprocating, including having the possibility of reciprocating motion relative to the stationary body, a cylindrical pusher with curved intersecting grooves of a given configuration of forward and reverse, in which rollers are placed corresponding to the shape of the grooves and belonging to the shaft located coaxially with the pusher having the possibility of rotational movement relative to the housing when moving the rollers along the grooves of the pusher, offset relative to relative to each other by a value of 2 π / n, where n is the number of grooves, characterized in that the rollers are made in the form of disks with axes located in a plane perpendicular to the radius of the pusher, and the disks are placed on the axes with a gap with a possibility of inclination for orientation relative to the grooves the pusher when the shaft rotates in one direction and the direction of movement of the pusher changes. 2. The device according to claim 1, characterized in that the grooves of the pusher for forward and reverse motion are made with different steps.

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