JPH0684053U - Linear motion mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to provide a linear motion mechanism capable of doubling the motion speed of a rail without complicating the structure. According to the present invention, a pair of parallel rails having toothed shapes each having a curved surface arranged at a predetermined pitch, a plurality of sliding bodies lined up in the sliding direction at the same pitch as the toothed shape, and interposed between the pair of parallel rails. In addition, a plurality of rotating plates that rotate with a predetermined phase difference in synchronization with the rotation of the input shaft in a state in which the sliding body is attached to the end surface of each rail side and the sliding body is in contact with the tooth profile of the rail. And is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a linear motion mechanism that converts rotational motion into linear motion, and more particularly, to a linear motion mechanism that is small and that can generate a large thrust.

[0002]

[Prior art]

 A linear motion mechanism that converts a rotary motion into a linear motion is often used as one of the basic mechanical elements. For example, a so-called rack and pinion is formed by meshing a linear rack and a disk-shaped pinion. The mechanism is representative. This mechanism transfers the rotational motion of the pinion to the rack by meshing the gears and converts it into the linear motion of the rack.However, the meshing area between the pinion and the rack is small, and in order to obtain a large thrust, the tooth profile of the rack and the pinion is required. It is necessary to expand the width, and there is a drawback that it cannot avoid being larger.

Therefore, the present applicant has previously proposed “linear motion mechanism” (Japanese Patent Application No. 4-333198, Dec. 14, 1992). FIG. 2 is a conceptual block diagram thereof. 1 is an input shaft driven by an electric motor provided separately, 2 to 4 are rotary plates (at least 3), K _{2a to} K _2d are cylindrical sliding bodies (at least 2 or more, depending on the required thrust; The figure shows four examples), and 6 is a rail in which tooth profiles having curved surfaces (for example, cycloid tooth profiles) are arranged at a predetermined pitch. Alternatively, the sliding body may be attached to the rail side and the tooth profile may be formed on the rotating plate side.

First eccentric crankshafts 7a to 7c having a phase difference of 120 degrees are integrally attached to the input shaft 1, and the first eccentric crankshafts 7a to 7c are the same. Together with the second phase eccentric crankshafts 8a-8c, the three rotating plates 2-4 are rotatably held on the axis in the direction orthogonal to the rails 6. The sliding bodies K _{2a to} K _2d are attached to the front rotary plate 2 at a predetermined pitch (however, the same pitch as the tooth profile of the rail 6), and slide on the rail 6 in accordance with the rotary motion of the rotary plate 2 (however, If the sliding bodies K _{2a to} K _2d are rotating bodies such as wheels, they roll). As with the rotating plate 2 on the front side, four sliding bodies are attached to each of the rotating plates 3 and 4 in the middle and the back. Hereinafter, the sliding bodies of the intermediate rotating plate 3 will be denoted by K _{3a to} K _3d , and the sliding bodies of the rotating plate 4 at the back will be denoted by K _{4a to} K _4d . That is, the symbols K _{ia to} K _id (where i is a group number 2 to 4) are used.

In such a configuration, as shown in FIG. 3, when the rotation angle of the input shaft is 0 degree, 90 degrees, 180 degrees and 270 degrees, the rotation plates 2 to 4 and the sliding body K are arranged._ia~ K _id (However, two consecutive ones are representative; for convenience, K_iaAnd K_ib) And the tooth profile of the rail 6 are as follows. A rotational phase difference of 120 degrees is provided between the three rotary plates 2 to 4 by the first and second eccentric crankshafts 7a to 7c and 8a to 8c. For convenience, when the rotation angle of the rotary plate 2 is used as a reference (that is, the phase difference from the input shaft 1 is zero), the rotary phases of the other rotary plates 3 and 4 are +120 degrees and +240 degrees, respectively. Is at a predetermined position on the rail 6, the other rotary plates 3 and 4 are at positions advanced by +120 degrees and +240 degrees from the predetermined positions. In other words, if one pitch of the tooth profile formed on the rail 6 is 360 degrees, the sliding body K is displaced by 1/3 pitch (120 degrees)._ia, K_ibAnd the tooth profile will come into contact.

Therefore, when one set of sliding bodies K _ia and K _ib is in contact with the ascending slope of the tooth profile (see symbols “a” to “e”), at least another pair of sliding bodies K _ia. , _Kib is in contact with the descending slope of the tooth profile (see symbols "f" to "nu"), the thrust required to overcome the climbing slope is determined by at least one other sliding body _Kia , _Kia . You can get it from _ib .

That is, during one rotation of the input shaft 1, at least one set of sliding bodies K _{ia to} K _id always comes into contact with the descending slope of the tooth profile, so that the propulsive force required to push the rail 6 is generated. , A size corresponding to the axial length and number of the sliding bodies K _{ia to} K _id is obtained, and a compact and powerful linear motion mechanism is realized.

[0008]

[Problems to be solved by the device]

 However, in the "linear motion mechanism" according to the above-mentioned prior application, the rail moves linearly by one pitch of the tooth profile during one rotation of the input shaft. To increase the rail motion speed, There is a problem that the structure becomes complicated because it is necessary to increase the rotation speed of the input shaft by a transmission or the like. [Purpose] Therefore, an object of the present invention is to provide a linear motion mechanism capable of doubling the motion speed of a rail without complicating the structure.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a pair of parallel rails having curved tooth profiles arranged at a predetermined pitch, a plurality of sliding bodies arranged in the sliding direction at the same pitch as the tooth profile, and the parallel pair of rails. And slide the slider on the end face of each rail, and rotate the slide with a predetermined phase difference in synchronization with the rotation of the input shaft with the slide contacting the tooth profile of the rail. And a plurality of rotating plates for controlling.

[0010]

[Action]

 In the present invention, when a rotary motion is given to the input shaft, the pair of parallel rails linearly move in opposite directions. Therefore, for example, if one rail is fixed, the other rail moves linearly at a speed obtained by adding the moving speeds of the pair of rails, that is, at a double speed.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a linear movement mechanism according to the present invention. Since the basic operation principle of the linear motion mechanism of the present embodiment is the same as that of the linear motion mechanism according to the prior application (FIGS. 2 and 3), the difference from the linear motion mechanism according to the prior application will be described below. Will be mainly described.

First, the configuration will be described. In FIG. 1, reference numerals 10a and 10b denote guides arranged in parallel, and guides 10a and 10b are provided with rails 11a and 11b with their respective surfaces facing each other. A large number of cylindrical pins 12a, 12b are embedded in the surface of the pair of rails 11a, 11b at a predetermined pitch, and a tooth profile of a predetermined pitch with the outer peripheral surface (curved surface) of the pins 12, a12b as the tooth surface. Is formed.

A plurality of (at least three) rotating plates 13 to 15 (however, the rotating plate 15 is hidden and invisible) are arranged between the pair of rails 11 a and 11 b, and each rotating plate 13 is disposed. At the rail-side ends of the rails 15 to 15, cycloid tooth profiles having the same pitch as the tooth profiles of the rails 11a and 11b (corresponding to sliding bodies described in the gist of the invention) 13a, 13b, 14a, 14b, 15a, 15b (however, cycloid tooth profile) 14b, 15a, 15b are hidden and invisible) are formed. Here, the number of teeth of the cycloid tooth profiles 13a 1, 13b, 14a, ... Is at least two. The greater the number of teeth, the greater thrust can be produced.

Two circular holes 13c and 13d are formed in each of the three rotary plates (typically, the first rotary plate 13), and the roller bearing 16 is provided in each of the circular holes 13c and 13d. Eccentric crankshafts 18 and 19 (corresponding to the first and second eccentric crankshafts 7a to 7c and 8a to 8c of the prior application) rotatably supported by the motors 17 and 17 are inserted. Reference numeral 20 is an input shaft fixed to the eccentric crankshaft 19.

In such a structure, when the input shaft 20 is rotated, the eccentric crankshafts 18 and 19 rotate, and the three rotary plates 13 to 15 are synchronized with this rotation by a predetermined phase difference (120). The swinging crank motion is performed while maintaining the degree). Therefore, during one revolution of the eccentric crankshafts 18 and 19, the tooth profile of one rotating plate always comes into contact with the downward slope of the tooth profile of the rail, and the rail is pushed, so that the rotary motion is smoothly linearized. Can be converted.

Further, in the present embodiment, the cycloid tooth profile is formed at both ends of the three rotary plates 13 to 15, and the cycloid tooth profile is brought into contact with the tooth profiles of the pair of parallel rails 11a and 11b. The rotational motion of the input shaft 20 can be taken out as a linear motion of the pair of rails 11a 1 and 11b in the opposite directions. Therefore, if one rail (for example, 11a) is fixed, the speed of the other rail 11b can be doubled without a transmission or the like. Further, if the part of the input shaft 20 is fixed, the pair of rails 11a and 11b linearly move in the opposite directions at a constant speed, and therefore, the invention can be applied to the same movement in the opposite direction.

[0017]

[Effect of device]

 According to the present invention, since it is configured as described above, it is possible to provide a linear motion mechanism that doubles the motion speed of the rail without complicating the structure.

[Brief description of drawings]

FIG. 1 is an external view of an embodiment.

FIG. 2 is a conceptual configuration diagram of a linear motion mechanism according to a prior application.

FIG. 3 is a diagram for explaining the operation of the linear motion mechanism according to the prior application.

[Explanation of symbols]

11a, 11b: Rails 13 to 15: Rotating plates 13a, 13b, 14a, ...: Cycloid tooth profile (sliding body) 20: Input shaft

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Asahiro Kiriyama 1110-1 Ozaki Miyazaki, Tarui-cho, Fuwa-gun, Gifu Prefecture Teijin Machinery Co., Ltd. Gifu No. 1 factory (72) Creator Mikiaki Hirai Tarui, Fuwa-gun, Gifu Prefecture Machimiyadai character Ozaki 1110-1 Teijin Seiki Co., Ltd. Gifu No. 1 factory

Claims (1)

[Scope of utility model registration request] 1. A pair of parallel rails in which tooth profiles each having a curved surface are arranged at a predetermined pitch, a plurality of sliding bodies lined up in the sliding direction at the same pitch as the tooth profile, and interposed between the pair of parallel rails. A plurality of rotating plates that rotate with a predetermined phase difference in synchronization with the rotation of the input shaft in a state where the sliding body is attached to the end surface on the rail side and the sliding body is in contact with the tooth profile of the rail. A linear motion mechanism characterized by being provided.