JPH06346950A - Mechanism for converting rotational motion into reciprocating motion - Google Patents

Abstract

PURPOSE:To prevent generation of a backlash caused by fitting tolerance and abrasion of members, and also to decrease friction and abrasion by using lubricating oil, in a mechanism for converting the continuous rotational motion into the reciprocating motion. CONSTITUTION:A mechanism is provided with a sliding element 1 having a center taper hole 1a, and slopes on two side surfaces faced to each other, a taper pin 2 to be fitted in the taper hole 1a of the sliding element 1, a driven element 3 with a groove 3a having the gradient on the inner surface to come in contact with the slope side surface of the sliding element 1, and for sliding the sliding element 1 in the groove, a spring 4 for energizing the taper pin 2 and the sliding element 1 so as to be always pressed by the driven element 3, a disc plate 6 fastened to a driving shaft 5, and for holding the taper pin 2 in the eccentric position in relation to the driving shaft 5 and a guide 7 to become a guide when the driven element 3 reciprocates accompanying the vibration of the sliding element 1. Moreover, a sintered metal wherein lubricating oil is partially impregnated in a part of the slide surface or an oil containing substance such as prorous resin are provided on the sliding element 1, and a function for supplying lubricating oil on respective slide surfaces of the taper pin 2 and the driven element 3 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for converting a rotary motion into a reciprocating motion, and more particularly to a mechanism for converting a rotary motion into a reciprocating motion using a sliding slider as a conversion portion.

[0002]

2. Description of the Related Art Conventionally, a structure as shown in FIG. 4 has been widely used for a converting mechanism of this kind of rotary motion to reciprocating motion. That is, in the mechanism that converts the rotational movement of the disc 16 indicated by the arrow G into the reciprocating movement of the follower 13 in the direction of the arrow H, the parallel pin 12 and the sliding slider 11 are used in the conversion portion. A straight rod-shaped parallel pin 12 provided at a position eccentric with respect to the drive shaft 15 of the disc 16 is shown in FIG. 7 (c) in the slider 11 sliding in the longitudinal groove 13a of the follower 13. Are fitted and contact with each other. Disk 16
When is rotated in the direction of arrow G, the slider 11 slides in the groove 13a in the direction of arrow F through the parallel pin 12, and
The follower 13 linearly moves in the direction of the arrow H along the guide 17 to convert the rotary motion into the reciprocating motion.

[0003]

In the above-mentioned conventional rotary motion to reciprocating motion converting mechanism, the shapes of the fitting / contacting portions of the slider 11, the parallel pin 12, and the follower 13 used in the converting portion are respectively formed. However, both have a straight shape with no taper. That is, between the slider 11 and the parallel pin 12, the straight portion of the parallel pin 12 fits into and contacts the straight hole of the slider 11, and between the slider 11 and the follower 13, the straight portion of the slider 11 is straightened. Groove 13a on both sides of the follower 13 without taper
It is designed to slide inside. Therefore, in the straight fitting / contacting portions of the slider 11 and the parallel pin 12, and the slider 11 and the follower 13, respectively, no matter how the dimensional accuracy of each constituent member is improved, There is a problem that some fitting tolerance is unavoidable, and there is a problem that rattling occurs at the fitting / contact portion due to friction or abrasion of the respective sliding surfaces.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a conversion mechanism from rotary motion to reciprocating motion in which the fitting / contacting portion does not cause rattling or abrasion.

[0005]

A rotary motion-to-reciprocating motion conversion mechanism according to the present invention has a tapered hole in the center and two opposing outer surfaces from an inclined surface inclined in the same direction as the tapered hole. And a taper pin having a bar shape and having a taper portion at one end that fits into the taper hole of the slider,
A disk that is fastened to a drive shaft and rotates to hold the other end of the taper pin at a position eccentric to the drive shaft, and an inner surface that has a slope in which the inclined surface of the slider fits and is drilled in a longitudinal shape. A follower that has a slanted groove and that slides the slider in the longitudinal direction in the groove through the taper pin as the disc rotates; and the taper pin through the slider. A spring for urging the follower side to press it, and a guide member for movably guiding the follower in a direction orthogonal to the longitudinal direction as the slider slides. The child is provided with an oil-containing substance impregnated with a lubricating oil in a portion including at least the inclined surface, and is configured to supply the lubricating oil to the respective sliding surfaces of the taper pin and the follower.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is AA of FIG.
Sectional drawing in a line, (d) is a perspective view of a slider. 2A and 2B are perspective views showing two examples of a slider provided with an oil-containing substance, and FIG. 3 is a sectional view of a sliding portion including the slider provided with an oil-containing substance.

The present embodiment shown in FIG. 1 is a mechanism for converting the rotational movement of the disc 6 indicated by the arrow G into the reciprocating movement of the follower 3 in the direction of the arrow H, which is fastened to the drive shaft 5. The rotating disk 6 is provided with a taper pin 2 that is fastened to the disk 6 at a position eccentric to the drive shaft 5 and is movable in a direction parallel to the drive shaft 5. The structure is such that it is connected to the follower 3 via the slider 1.

As shown in FIGS. 1 (c) and 1 (d), the rod-shaped taper pin 2 has a tapered portion 2a having a conical tip.
The non-tapered rod portion is fastened to the disc 6 at a position eccentric to the drive shaft 5. The slider 1 has a tapered tapered hole 1a at the center which matches the tapered portion 2a of the tapered pin 2, while the two opposing outer surfaces form a tapered surface 1b inclined in the same direction as the tapered hole 1a. ing. The follower 3 has a groove 3a bored in the longitudinal direction so that the slider 1 fits and slides, and the inner surface of the groove 3a is inclined such that it matches the inclined surface 1b of the slider 1. It is the surface 3b. As shown in FIG. 1C, the slider 1, the taper pin 2 and the follower 3 having such a shape are fitted so that the tapered hole 1a and the tapered portion 2a and the inclined surface 1b and the sloped surface 3b are aligned with each other. These members are fitted together and slide together without rattling by providing a spring 4 for urging the taper pin 2 in the direction of the taper portion 2a between the disk 6 and the disk 6, and urging the taper pin 2 together. Becomes The follower 3 is guided and supported by two guides 7 so as to be reciprocally movable.

As shown in FIG. 2, the slider 1 is constructed by providing an oil-containing substance 8 impregnated with lubricating oil, and lubricates the sliding surface between the taper pin 2 and the follower 3 with the lubricating oil. It can be shaped like this. The oil-impregnated substance 8 is provided from the slanted surface 1b of the slider 1 to the tapered hole 1a. The slanted surface 1b is provided on the slanted surface 1b intermittently (FIG. 2 (a)) It is conceivable that the surface 1b is provided over the entire length (FIG. 2B). The oil-containing substance 8 is made of sintered metal, porous resin, or the like.

The operation of this embodiment thus constructed will be described below. When the drive shaft 5 is rotated, the disk 6 rotates in the direction of arrow G, and this rotation is transmitted to the slider 1 via the taper portion 2a of the taper pin 2. The slider 1 moves while sliding in the groove 3a of the follower 3 in the direction of arrow F. Since the follower 3 is reciprocally supported by the two guides 7, as the slider 1 moves in the arrow F direction,
It reciprocates along the guide 7 in the direction of arrow H. In this way, the rotational movement of the disc 6 is converted into the reciprocating movement of the follower 3. At this time, the taper portion 2a of the taper pin 2 is constantly pressed against the taper hole 1a of the slider 1 by the urging force of the spring 4, and the inclined surface 1b of the slider 1 is always inclined by the urging force of the spring 4 of the follower 3. Since they are pressed against the surface 3b, these contact surfaces and sliding surfaces, that is, the contact surface between the tapered portion 2a of the taper pin 2 and the tapered hole 1a of the slider 1 and the inclined surface 1b of the slider 1 and the gradient of the follower 3 No rattling occurs on the sliding surface with the surface 3b. Slipper 1
The lubricating oil impregnated in the oil-containing substance 8 provided in FIG.
As shown in FIG. 3, the contact surfaces of the taper pin 2 and the slider 1 and the sliding surfaces of the slider 1 and the follower 3 are supplied to perform a lubricating action, respectively, so that the occurrence of friction and abrasion in these parts is reduced. be able to.

[0012]

As described above, in the mechanism for converting the rotary motion to the reciprocating motion according to the present invention, the tapered pin, the slider and the follower are provided with the tapered portion, the tapered hole, the inclined surface and the inclined surface, respectively, and the taper fitting is performed. By making these contact surfaces press against each other by the elasticity of the spring, it is possible to absorb the looseness caused by the fitting tolerance of each member and the abrasion of the sliding surface. Further, since the slider has an oil-containing substance on a part of the sliding surface, the lubricating oil impregnated with the oil-containing substance is supplied to the sliding surface, which has the effect of reducing friction and abrasion of the sliding surface. .

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a plan view,
(B) is a front view, (c) is sectional drawing in the AA line of the same figure (a), (d) is a perspective view of a slider.

FIG. 2 is a perspective view showing two examples of a slider provided with an oil-containing substance in (a) and (b), respectively.

FIG. 3 is a cross-sectional view of a sliding portion including a slider provided with an oil-containing substance.

4A and 4B show an example of a conventional conversion mechanism, FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a cross-sectional view taken along line BB in FIG. 4A.

[Explanation of symbols]

 1,11 Slider 2 Tapered pin 3,13 Follower 4 Spring 5,15 Drive shaft 6,16 Disc 7,7 Guide 8 Oil-impregnated substance 12 Parallel pin

Claims (3)

[Claims] 1. A slider having a tapered hole in the center and two opposing outer surfaces each of which is an inclined surface inclined in the same direction as the tapered hole, and a slider having a rod shape at one end of the tapered hole of the slider. A taper pin having a taper portion to be fitted, a disc which is fastened to a drive shaft to rotate and holds the other end of the taper pin at a position eccentric to the drive shaft, and an inner side surface of the inclined surface of the slider. A follower that has a groove that is formed in a longitudinal shape with a slope to be fitted and that slides the slider in the longitudinal direction within the groove via the taper pin as the disc rotates; A spring for urging the taper pin to press the taper pin toward the follower via the slider, and a guide for movably moving the follower in a direction orthogonal to the longitudinal direction as the slider slides. Rotation including a guide member for A conversion mechanism from motion to reciprocating motion. 2. The slider includes an oil-containing substance impregnated with lubricating oil in a portion including at least the inclined surface, and the lubricating oil is supplied to sliding surfaces of the taper pin and the follower, respectively. The conversion mechanism from rotary motion to reciprocating motion according to claim 1, wherein 3. The conversion mechanism from rotary motion to reciprocating motion according to claim 2, wherein the oil-containing substance is made of sintered metal or porous resin.