JPH11343923A - Rotational motion/reciprocating motion converting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and stably drive a cylinder device by providing a plurality of inclined side connecting members performing pestle motions by the combination of a rotational motion and a linear reciprocating motion between a rotary shaft and a linear reciprocating moving member and operating the cylinder device by the motion. SOLUTION: A Z-axis part 1 is formed by providing connection axis parts 1b, 1b at both the ends of an inclined axis part 1a along an inclined axis line Z', a plurality of arms 9 are provided on an inclined member 3 which is freely rotatably mounted on the inclined axis part 1a and an inclined side connecting member (a member to be held) 4 is provided at a tip part of each arm 9. As a result, the inclined side connecting member 4 is made to perform a rotational spiral motion by revolution of a rotary shaft A. A plurality of each reciprocating and moving members 6 reciprocating and moving in a rotational axis line Z direction are provided, a tip part of the reciprocating and moving connecting member (piston rod) 7 is connected with the inclined side connecting member 4 and the reciprocating and moving member (piston) 6 is reciprocated and moved by the rotational spiral motion of the inclined side connecting member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary / reciprocating motion converting device for converting a rotary motion into a linear reciprocating motion and vice versa. Rotational movement / reciprocation that can be suitably used when converting rotational movement into reciprocation of a plurality of linear reciprocating members or converting reciprocating movement of a plurality of linear reciprocating members into rotation of one rotating shaft. The present invention relates to a conversion device. like this,
The rotary motion / reciprocating motion conversion device is a pump that achieves a purpose by reciprocating a number of pistons arranged in a bundle and annularly parallel around a central axis alternately by rotation of one main shaft at the center thereof, It is used for compressors, vacuum pumps, expanders, actuators, internal combustion engines, Stalin cycles, etc.

[0002]

2. Description of the Related Art A large number of techniques for reciprocating a plurality of parallel pistons arranged in a ring and in a bundle in the same principal axis direction with a single principal axis centered on the same principal axis have been known. It is. (J01) Rotational-to-reciprocal motion conversion device of inclined plate (swash plate) drive system FIG. 10 is an explanatory view of a conventional rotary-to-reciprocal motion conversion device, and is an explanatory view of a tilted plate drive system. In FIG. 10, the inclined plate 02 rotates with the rotation of the rotation shaft 01 rotating around the rotation axis A. The inclination angle between the inclination axis B perpendicular to the inclination plate 02 and the rotation axis A is indicated by θ. At the lower end of the piston rod 03, a holding portion 03a for holding the outer end of the rotating inclined plate 02 is provided. The upper end of the piston rod 03 is a piston 04
It is connected to the. The piston 04 is supported by a cylinder (not shown) so as to be able to reciprocate in a direction along the rotation axis A. With the rotation of the rotating shaft 01, the inclined plate 02 also rotates. At this time, the inclined axis B rotates in a conical plane centered on the rotating axis A. At this time, the inclination direction of the inclined plate 02 (the direction of a straight line connecting the highest position and the lowest position of the inclined plate) also rotates around the rotation axis A.

At this time, each of the holding portions 03a for holding the outer end of the inclined plate 02 reciprocates vertically. In conjunction with this, the piston rod 03 and the piston 04
Reciprocates. Therefore, when a plunge pump is constituted by the piston 04 and a cylinder (not shown) supporting the piston 04, the plunger pump can be operated by rotating the rotating shaft 01. Further, it is possible to configure a Stirling engine using a plurality of pistons 04 and a plurality of cylinders (not shown) that support them. In this case, the rotation shaft 01 can be rotated by the operation of the Stirling engine. .

(J02) Rotational / reciprocating motion conversion device of Z-shaft-based star-shaped multi-arm rod system FIG. 11 shows a conventional multi-rotational / reciprocating motion conversion device of a Z-shaft-based star-shaped multi-armed rod system. FIG. FIG.
, The rotating shaft 010 is provided with an inclined shaft portion 011a provided along an inclined axis B inclined with respect to the rotating axis A, and a connecting shaft portion 0 connected to both ends of the inclined shaft portion 011a.
11b, and a pair of upper and lower shaft ends 012, 01 connected to the outer ends of the connection shafts 011b and provided along the rotation axis A, respectively.
And 2. When the rotation axis 010 rotates about the rotation axis A, the tilt axis 011a rotates in a conical plane including the tilt axis B with the rotation axis A as a center line. A bevel gear 013 is mounted on the Z-shaped shaft portion 011,
It is configured to rotate integrally with the mold shaft portion 011. The hemispherical inclined member 014 rotatably mounted on the inclined shaft portion 011a cannot rotate around the rotation axis A.

[0005] The inclined member 014 has four arms 014a radially extending in a plane perpendicular to the inclined axis B and a bevel gear 014b formed on the outer periphery of the lower end.
The lower end of the piston rod 017 is connected to the distal end of each arm 014a via a ball joint 016. A piston 019 is connected to the upper end of each piston rod 017 via a ball joint 018. The piston 019 is supported by a cylinder (not shown) so as to perform a linear reciprocating motion. With the rotation of the rotation axis 010, the tilt axis 011a rotates around the rotation axis A. At this time, the tilt axis B rotates in a conical plane with the rotation axis A as the center line. At this time, the arm 01 of the inclined member 014
The ball joint 016 supported by 4a performs a circular motion when viewed from the direction of the rotation axis A when the rotation axis 010 rotates, and also rotates the rotation axis A when the rotation axis 010 rotates.
And when it is viewed from a linear direction passing through the ball joint 016, a figure eight-shaped motion is performed. At this time, the piston 019 reciprocates vertically.

Therefore, when a plunge pump is constituted by the piston 019 and a cylinder (not shown) supporting the piston 019, the plunger pump can be operated by rotating the rotary shaft 010. Also,
A Stirling engine or the like can be configured by using a plurality of the pistons 019 and a plurality of cylinders (not shown) supporting the pistons 019. In this case, the rotation shaft 010 can be rotated by the operation of the Stirling engine or the like. .

[0007]

[Problems to be Solved by the Invention]
Problem 1) In the technique (J01), the holding portion 03a at the lower end of the piston rod 03 comes into frictional contact with the rotating inclined plate 02 and moves the piston 03 in the axial direction. However, there is a disadvantage that the inclination angle θ of the inclined plate 02 cannot be set to 25 ° or more to suppress the friction.

(Problems of the Prior Art (J02)) In the technique of (J02), the ball joint 016 provided at the tip of each arm 015 of the inclined member 014 rotatably mounted on the Z-shaped shaft portion 011 is provided. Performs a circular motion when viewed from the direction of the rotation axis A when the rotation axis 010 rotates, and when viewed from a linear direction perpendicular to the rotation axis A and passing through the ball joint 016 when the rotation axis 010 rotates. In the case of the exercise, an eight-shaped exercise is performed. Therefore, in order to follow the movement of the ball joint 016, each of the ball joints 016 and each of the pistons 019
Long rods 12 and 13 are required between the lower ball bearing 018 and the inclined member 014 itself is prevented from rotating around the rotation axis A with the rotation shaft 010. The rotation of the inclined member 014 had to be restrained by a set of bevel gears 013 and 014a fixed and the other fixed to the rotating shaft. Therefore, this system also has a disadvantage that it is long, complicated and expensive as a whole.

In view of the above problems, the present invention converts the rotational motion of a rotating shaft into a linear reciprocating motion of a linear reciprocating member,
On the contrary, in the rotary / reciprocating motion converting device for converting the linear reciprocating motion into the rotary motion, the following description (O0
1) and (O02) are issues. (O01) To efficiently convert a rotary motion and a linear reciprocating motion between a rotary shaft and a linear reciprocating member. (O02) An object of the present invention is to provide a rotary motion / reciprocating motion conversion device capable of reducing the frictional force generated at the time of converting the rotary motion / reciprocating motion and increasing the stroke of the linear reciprocating motion.

[0010]

Next, the present invention devised to solve the above-mentioned problem will be described. However, in order to facilitate understanding of the present invention, it will be described with reference to FIGS. .
The reason why the present invention is described with reference to FIGS. 1 and 2 is to facilitate understanding of the present invention, and not to limit the scope of the present invention to the configurations of FIGS. 1 and 2.

(The present invention) FIG. 1 is an overall explanatory view of a rotary / reciprocating motion conversion device of the present invention. FIG. 2 is an operation explanatory view of the present invention shown in FIG. 1 and 2, in order to solve the above-mentioned problem, the rotary motion / reciprocating motion conversion device of the present invention has the following requirements (A01) to (A06). An inclined shaft 1a provided along an inclined axis Z 'inclined with respect to the axis Z, and connection shafts 1b, 1 connected to both ends of the inclined shaft 1a.
b having a Z-shaped shaft portion 1 and the rotation axis Z
Rotation axis A rotatable around (A02) the inclined shaft portion 1a
(A03) a plurality of inclined connecting members 4 supported by the inclined member 3, wherein the inclined member 3 is rotatably mounted on the rotating shaft A and cannot rotate around the rotation axis Z;
When the is rotated, the rotational sliding motion is an eight-shaped motion as viewed from a linear direction passing through the inclined side connecting member perpendicular to the rotation axis Z and a small circular motion as viewed from the rotation axis Z direction. Slant side connecting member 4, (A04) the rotation axis Z
One end is connected to each of the plurality of reciprocating members 6 reciprocating in the direction, and the other reciprocating connecting member 7 supports a reciprocating side connecting member 8 connected to the inclined side connecting member 4 at the other end. (A05) The reciprocating side connecting member 8 which reciprocates in the direction of the rotation axis when the inclined side connecting member 4 performs a rotary sliding motion, (A06) a pair of pinchings which are arranged apart in the direction of the rotation axis Z. The surfaces 8a, 8a and the pair of holding surfaces 8
a, the inclined side connecting member 4 which constitutes one of the clamped members 4 which is relatively non-movable in a direction perpendicular to the holding surfaces 8a, 8a and relatively movable in a direction along the holding surfaces 8a, 8a.
And the reciprocating side connecting member 8 constituting the other.

In the present invention, when the angle between the rotation axis Z and the tilt axis Z ′ is θ, θ is 15 °.
It is possible to set in the range of ≦ θ ≦ 45 °. The inclination member 3 is provided with a plurality of arms 9 extending radially from an intersection O of the rotation axis Z and the inclination axis Z ', or a plate of a projection circle or other various shapes (not shown).
Can be adopted. Each of the plurality of clamped members 4 supported by the inclined member 3 can be provided at the tip of the arm 9 or at the outer periphery of a plate (not shown).

Various members capable of reciprocating movement can be adopted as the reciprocating members 6, and the following members can be exemplified as the reciprocating members. (A) a piston 6 slidably supported by a cylinder 5;
(B) a slide moving member (not shown) such as a slider supported by a guide member (not shown) so as to be able to linearly reciprocate; (c) one end is connected to a free end of a fixed bellows or diaphragm; Member, the reciprocating member 6
Is constituted by a piston, the reciprocating connecting member 7 is constituted by a piston rod. The number of the reciprocating members 6 and the reciprocating direction can be appropriately set. However, if the reciprocating direction is set in a direction parallel to the rotation axis Z, the reciprocation corresponding to one rotation of the rotation axis A The stroke of the moving member 6 can be increased.

The rotation axis Z and the tilt axis Z 'are arranged so that they intersect at an intersection O. Each of the plurality of inclined side connecting members 4 supported by the inclined member 3 is connected to the intersection O
And it is preferable to arrange in a plane W perpendicular to the tilt axis Z ′. Further, it is preferable that the distance between each of the inclined side connecting members 4 and the intersection O is set to the same value L.

It is preferable that the pair of holding surfaces 8a, 8a for holding the holding member 4 be arranged along a plane perpendicular to the reciprocating movement direction of the reciprocating side connecting member 8. The pair of clamping surfaces 8a, 8a themselves need not be flat, but the member to be clamped 4 clamped by the pair of clamping surfaces 8a, 8a can be relatively moved within a predetermined range along the clamping surfaces 8a, 8a. In particular, it is necessary to have a shape that can be held so as to be relatively movable along a projection circle E (see FIG. 1 and described later). For example, when the pair of holding surfaces 8a, 8a are flat and parallel surfaces, the held member 4 can be formed in a spherical shape, and the held member 4 can be formed in any shape. It is also possible to adopt a configuration in which a bearing or the like is arranged on the contact surface with the surfaces 8a, 8a so that the held member 4 can move within a predetermined range along the pair of holding surfaces 8a, 8a. Instead of forming the inclined side connecting member 4 by a sandwiched member and forming the reciprocating side connecting member by a pair of sandwiching surfaces 8a, 8a, the reciprocating side connecting member 8 is constituted by a sandwiched member and the inclined side connecting member 4 is formed. It is possible to configure with a pair of holding surfaces.

The rotary motion / reciprocating motion converter of the present invention has a pump, compressor, vacuum pump, expander, actuator, multi-piston internal combustion engine having a parallel multi-piston drive and performing the piston motion.
It can be used for Stirling cycle equipment and the like.

(Function of the Present Invention) In the rotary motion / reciprocating motion converter of the present invention having the above-described configuration, when the rotation axis A is rotated around the rotation axis Z, the tilt axis Z inclined with respect to the rotation axis Z is obtained. ', The Z-shaped shaft portion 1 constituted by the inclined shaft portion 1a provided along the' and the connecting shaft portions 1b connected to both ends of the inclined shaft portion also rotates around the rotation axis Z. The inclined member 3 rotatably mounted on the inclined shaft portion 1a of the Z-shaped shaft portion 1 cannot rotate around the rotation axis Z. Therefore, when the rotation axis A rotates, the inclination direction of the inclination shaft portion 1a rotates. At this time, the inclination direction of the inclination member 3 rotates. When the rotation axis A rotates, the inclined side connecting member 4 supported by the inclined member 3 has a figure-eight movement perpendicular to the rotation axis Z and viewed from a straight line passing through the inclined side connecting member. A rotary oscillating motion, which is a small circular motion as viewed from the rotation axis Z direction, is performed. That is, the inclined side connecting member 4 reciprocates in the direction of the rotation axis Z while performing the rotational sliding motion.

A plurality of reciprocating connecting members 7 each having one end connected to the plurality of reciprocating members 6 reciprocating in the direction of the rotation axis Z are connected to the inclined side connecting member 4 at the other end. It has a reciprocating side connecting member 8. The held member 4 that constitutes one of the inclined side connecting member 4 and the reciprocating side connecting member 8 is a pair of sandwiching surfaces that are arranged apart from each other in the direction of the rotation axis Z that constitute the other connecting member. 8a,
8a, when the held member 4 reciprocates in the rotation axis Z direction, the holding surfaces 8a, 8a
Is also reciprocated in the rotation axis Z direction.

The held member 4 is provided with the holding surfaces 8a,
Since it is held so as to be relatively movable in the direction along 8a, it is possible to perform movement in the direction along the holding surfaces 8a, 8a. Therefore, a relatively small circular motion is generated between the clamped member 4 and the clamping surfaces 8a, 8a along the clamping surfaces 8a, 8a, but the frictional force due to the relative circular motion is lower than that of a ball bearing or the like. Since the size can be reduced by using the friction member, the energy loss due to friction can be reduced.

The reciprocating members 6 are arranged such that the reciprocating direction is substantially parallel to the rotation axis Z. Therefore, the reciprocating member 6 connected to the inclined side connecting member (member to be clamped) 4 of the inclined member 3 via the reciprocating side connecting member 8 having the clamping surfaces 8a and 8a and the reciprocating member 7 is It is possible to obtain the same stroke as the moving distance of the inclined side connecting member 4 in the direction of the rotation axis Z. That is, the stroke of the reciprocating member 6 is equal to the moving distance of the inclined side connecting member 4 in the direction along the rotation axis Z, so that a relatively large stroke can be obtained.

Next, referring to FIG. 1, the reciprocating direction of each reciprocating member 6 is set to a direction parallel to the rotation axis Z.
The rotation axis Z and the inclination axis Z 'are arranged so that they intersect at an intersection O, and each of the plurality of inclination-side connecting members 4 supported by the inclination member 3 includes the intersection O and extends along the inclination axis Z'. The distances between the respective inclined side connecting members 4 and the intersection points O are arranged in a vertical plane W, and all the distances L are equal to each other.
The operation in the case of setting to is described. In FIG. 1, a spherical inclined side connecting member 4 supported by an inclined member 3 which is mounted rotatably about an inclination axis Z ′ having an inclination angle θ with respect to the rotation axis Z and is not rotatable about the rotation axis Z is shown. The movement of the center points P and Q of the spherical holding member 4 is analyzed.

An intersecting line between a plane W including the plurality of clamped members 4 (a plane including the P and Q) and a plane Y including the intersection point O and perpendicular to the rotation axis Z is XX '. , Q, X and X ′ are all coincident with the points P0 and Q0 on the plane Y. When XX ′ is turned right by an angle ψ and the angle P0OX is ψ, the held member 4 is supported. On the contrary, when the point P is held so that the angle POX returns to the original angle ψ when viewed from XX ′ and the angle POX is also は, the points P and Q are shaped like an eight as shown in the figure. Exercise M is performed. This figure-shaped movement M is a figure 8 when viewed from a linear direction passing through the point P0 or Q0 and perpendicular to the rotation axis Z, but if the movement M is a ray parallel to the rotation axis Z, When projected onto a lower plane V perpendicular to, a small projection circle as shown by E in FIG. 1 is obtained.

The reason is that the center point of the figure 8 movement is P0,
When the upper end point is set to P1 and another FIG. 2 shows an enlarged view of the motion of an arbitrary rod tip sphere P point projected on the V plane in FIG. 1, points P, P0 and P1 are projected on the V plane. Position P ', P
0 'and P1', the line segment P0 '
The length of P1 'is L (1-cos θ), the length of P0'P' is L (1-cos θ) sinｓ, and
0'P 'is always perpendicular to the XX' line, so the angle P0'P'P
This is because 1 'is always a right angle, and it is proved that P' always exists on the projected circle E centered on P0'P1 '.

The center of the reciprocating member 6 is the projected circle E
Is reasonably located at the center of the projection circle E.
The distance M between the center of the rotation axis and the rotation axis Z is M = L (1 + c
os θ) / 2. In this case, the center of the held member 4 held by the pair of holding surfaces 8a at the lower end of the reciprocating member 6 moves on the projection circle E. Therefore,
When the holding surfaces 8a, 8a are reciprocated only in a direction parallel to the rotation axis Z (the reciprocating member 6 and the holding surfaces 8a, 8a are non-rotatably connected to the reciprocating connecting member 7). In this case, the area of the holding surfaces 8a, 8a needs to be large enough that the held member 4 moving on the projection circle E does not protrude. When such a configuration is adopted, the stroke of the reciprocating member 6 is equal to the moving distance of the pinched member 4 in the direction along the rotation axis Z, so that a large stroke is obtained. Further, by reducing the friction between the clamped member 4 and the clamping surfaces 8a, 8a for clamping the member 4, it is possible to provide a rotational / reciprocating motion converter with extremely low friction.

Therefore, the present invention can improve the conversion efficiency by reducing the energy loss due to friction of the conventional rotary motion / reciprocating motion converter. In addition, the inclination angle θ of the Z-shaped shaft was conventionally 25 ° or less due to low friction, but can be increased to 30 ° to 45 ° in the present invention, and the reciprocating member 6 and the reciprocating connecting member 7 can be increased. The number can be arbitrarily set including an odd number, and the arms need not have the same length. Further, when the number of the reciprocating connecting members 7 is plural, the tilting of the inclined member 3 is prevented by the interaction of the held members 4.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1 of the present invention) A rotary motion / reciprocating motion converter according to Embodiment 1 of the present invention has the following requirements (A07) and (A08) in the present invention. (A07) The reciprocating member 6, which is constituted by a piston supported reciprocally by each of the plurality of cylinders 5, (A08) one end is connected to the piston, and the other end is connected to the other end. The reciprocating connecting member 7 constituted by a piston rod provided with the reciprocating side connecting member 8.

The reciprocating side connecting member 8 can be formed separately from or integrated with the reciprocating moving connecting member 7.

(Operation of the First Embodiment of the Present Invention) In the rotary motion / reciprocating motion converting apparatus of the first embodiment of the present invention having the above-described configuration, the reciprocating member 6 constituted by a piston is provided with a plurality of reciprocating members. Each cylinder 5 is supported so as to be able to reciprocate. One end of the reciprocating connection member 7 constituted by a piston rod is connected to the piston,
The reciprocating connection member 8 is provided at the other end. Therefore, the rotary motion / reciprocating motion converter is provided with the rotary shaft A
Can be converted into a reciprocating motion of the piston 6, so that it can be used for a plunger pump. Further, since the rotary motion / reciprocating motion converting device can convert the reciprocating motion of the piston 6 into the rotary motion of the rotary shaft A, it can be used for an expander, a Stirling engine and the like.

(Second Embodiment of the Present Invention) The rotary motion / reciprocating motion converter according to the second embodiment of the present invention has the following requirement (A09) in the present invention or the first embodiment of the present invention. (A09) Each of the plurality of clamped members 4 arranged in a clamped member arrangement surface W which is a surface perpendicular to the inclined axis Z ′.

(Operation of the Second Embodiment of the Present Invention) In the rotary motion / reciprocating motion converter according to the second embodiment of the present invention having the above-described configuration, each of the plurality of clamped members 4 includes the tilt axis Z ′ Are arranged in the sandwiched member arrangement surface W which is a surface perpendicular to ′. In this case, the shape of the figure eight movement is vertically symmetrical, and the shape of the projected circle E formed by the upper part and the lower part of the figure eight is the same. In addition, since the moving distance (stroke) of the clamped member 4 in the direction along the rotation axis Z becomes long, the reciprocating direction of the reciprocating connecting member 7 is set to the direction along the rotation axis Z, The strokes of the reciprocating connecting member 7 and the reciprocating member 6 can be made relatively long.

(Third Embodiment of the Present Invention) The rotary motion / reciprocating motion conversion device according to the third embodiment of the present invention is the same as that of the first or second embodiment of the present invention, except that (A010).
10) Each of the plurality of inclined side connecting members 4 arranged at a position equidistant from the rotation axis Z.

(Operation of the Third Embodiment of the Present Invention) In the rotary motion / reciprocating motion converter according to the third embodiment of the present invention having the above configuration, each of the plurality of inclined side connecting members 4 is connected to the rotation axis. It is arranged at a position equidistant from Z. For this reason, it is easy to make the moving distances of the respective inclined side connecting members 4 in the Z-axis direction equal.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment (that is, an embodiment) of a rotary motion / reciprocating motion converter of the present invention will be described with reference to the drawings, but the present invention is limited to the following embodiments. Not something. (Embodiment 1) FIG. 3 is an overall explanatory view of Embodiment 1 of the rotary motion / reciprocating motion converter of the present invention. FIG. 4 is a detailed explanatory view of the inclined side connecting member and the reciprocating side connecting member shown in FIG. FIG. 5 is a perspective view of a main part of the reciprocating side connecting member shown in FIG. 3 to 5, a rotation axis A rotatable around the rotation axis Z includes an inclination axis 1a provided along an inclination axis Z 'having an inclination angle θ with respect to the rotation axis Z, and the inclination axis 1a. Has a Z-shaped shaft portion 1 composed of connection shaft portions 1b, 1b connected to both ends of the shaft. An inclined member 3 that cannot rotate around the rotation axis Z is rotatably mounted on the inclined shaft portion 1a. The inclined member 3 is provided with four arms 3a extending from the intersection of the rotation axis Z and the inclination axis Z 'in a direction perpendicular to the inclination axis Z'. A shaft 3b (see FIG. 4) is provided at the tip of each arm 3a, and each shaft 3b has a spherical pinched member (inclined side connecting member).
Is mounted rotatably. When the rotating shaft A rotates, the rotating sphere (inclined side connecting member) 4 supported by the inclined member 3 moves in an eight-character manner as viewed from a straight line passing through the rotating sphere 4 and perpendicular to the rotation axis Z. And a rotary oscillating motion which is a small circular motion as viewed from the rotation axis Z direction. That is, the rotating sphere 4 reciprocates in the direction of the rotation axis Z while performing the rotating rubbing motion.

Four cylinders 5 are provided around the rotation axis A.
Are equidistantly arranged at 90 ° intervals around the rotation axis A. One end (upper end member) of each piston rod (reciprocating connection member) 7 is connected to each piston (reciprocating member) 6 supported by each cylinder 5 so as to be able to reciprocate. Each piston rod (reciprocating connecting member)
7 has a C-shaped bearing support 7 at the other end (lower end).
a and a guided pin 7b protruding in a direction away from the rotation axis Z. A pair of upper and lower bowl-shaped holding members (reciprocating-side connecting members) 8, 8 rotatably supported in a horizontal plane (a plane perpendicular to the rotation axis Z) via bearings B on the bearing support portion 7a. Supported. The holding members (reciprocating side connecting members) 8, 8 are members connected to the rotating sphere 4, and have holding surfaces 8 a, 8 a for holding the rotating sphere 4.

In FIG. 5, the pair of holding surfaces 8a, 8a
Is formed in a semi-doughnut-shaped dish shape protruding from the center, and can press the rotating sphere 4 from above and below. In other words, the pair of holding surfaces 8a, 8a allow the rotating sphere 4 to relatively move in the direction perpendicular to the holding surfaces 8a, 8a and to move relatively in the direction along the holding surfaces 8a, 8a. Pinch. For this reason, as the rotating ball 4 reciprocates in the direction of the rotation axis Z while performing the rotary oscillating motion, the holding surfaces 8a, 8a of the holding members (reciprocating side connecting members) 8, 8 are rotated by the rotation axis. Reciprocate in the Z direction. The holding surface 8a has an arc-shaped round groove having a ring-shaped valley bottom 8b having a diameter D, and the arc radius r of the round groove matches the radius of the rotating sphere 4. Further, the diameter D of the ring-shaped valley bottom 8b is made to match the diameter D of the projection circle E shown in FIG. 2, and D = L (1-cos θ). For example, the inclination angle θ
Are 20 °, 30 ° and 40 °, while D is the arm 3a
Are 3.02%, 6.70%, and 11.70% of the length L, and D increases as the inclination angle θ increases.

A circular plate 12 of a guide member 11 is mounted on the rotary shaft A so as to be relatively rotatable, and the guide member 11 is non-rotatably connected by a frame member (not shown). The guide member 11 is the circular plate 1
2 and four guide plates 13 projecting upward from the circular plate 12.
3, a guide groove 13a parallel to the rotation axis Z is formed. A pin 7b protruding outward from the lower end of the piston rod 7 is slidably engaged with the guide groove 13a. Therefore, when the holding member 8 and the piston rod (reciprocating connection member) 7 reciprocate in the direction of the rotation axis Z with the figure-eight movement of the rotating ball 4 during the rotation of the rotation shaft A, the pin 7b is configured to be guided by the guide groove 13a.

(Effects of the First Embodiment) In the first embodiment of the rotary motion / reciprocating motion converter of the present invention having the above configuration, when the rotation axis A is rotated around the rotation axis Z, An inclined shaft portion 1a provided along the inclined inclined axis Z 'and a connecting shaft portion 1b connected to both ends of the inclined shaft portion.
Also rotates around the rotation axis Z. The inclined member 3 rotatably mounted on the inclined shaft 1a of the Z-shaped shaft cannot rotate around the rotation axis Z. Therefore, when the rotation axis A rotates, the inclination direction of the inclination shaft portion 1a rotates. At this time, the inclination direction of the inclination member 3 rotates. At this time, the plurality of rotating spheres 4 supported by the tip of the arm 3a of the inclined member 3 reciprocate in the direction of the rotation axis Z.

One end (upper end) of each of the plurality of piston rods 7 is connected to the plurality of pistons 6 which are supported by the cylinder 5 so as to be able to reciprocate in the direction of the rotation axis Z. At the other end (lower end) of the piston rod 7, the holding members 8, 8 rotatably supported at positions separated in the direction of the rotation axis Z hold the rotating ball 4. The rotating ball 4 is held by the holding surfaces 8a, 8a of the holding members 8, 8 so as to be relatively immovable in a direction perpendicular to the holding surfaces 8a, 8a. When reciprocating in the direction of the axis Z, the piston rod 7 supporting the holding members 8, 8 having the holding surfaces 8a, 8a also reciprocates in the direction of the rotation axis Z.

Also, a rotating sphere 4 for performing a rotary oscillating motion
Is held so as to be relatively movable in the direction along the holding surfaces 8a, 8a, so that the holding surfaces 8a, 8a can perform a circular motion in the direction along the ring-shaped valley bottoms 8b, 8b. Therefore, even if the rotating sphere 4 is moved up and down by the rotational oscillating movement by the rotation of the rotating shaft A, the piston 6 and the piston rod 7 smoothly reciprocate while performing the movement of the small projected circle E without coming off the holding member 8. Can exercise. At the same time, the rotating sphere 4 has a ring-shaped valley bottom 8.
Since the holding member 8 is held between the pair of holding surfaces 8 a, 8 a having the b, the rotating ball 4 does not come off and the inclined member 3 having the arm 3 a does not swing with the rotation of the rotation axis A. Further, since the holding surfaces 8a, 8a are freely rotated by the bearings B, B, the holding surface 8a is located between the rotating ball 4 and the holding surfaces 8a, 8a.
No large frictional resistance is generated in the directions along a and 8a. Therefore, energy loss is small. For this reason, it is possible to set the inclination angle θ of the rotation axis Z and the inclination axis Z ′ to be relatively large while keeping the energy loss due to friction low.

The pistons 6 are arranged such that the reciprocating direction is substantially parallel to the rotation axis Z. Accordingly, the holding members 8, 8 having the holding surfaces 8a, 8a are provided on the rotating sphere 4 at the tip of the arm 3a of the inclined member 3.
And a piston 6 connected via a piston rod 7
Can obtain substantially the same stroke as the moving distance of the rotating sphere 4 in the direction of the rotation axis Z. That is, the stroke of the piston 6 corresponds to the rotation axis Z of the rotation ball 4.
Is relatively equal to the moving distance in the direction along, so that a relatively large stroke can be obtained.

When the piston rod 7 connected to the piston 6 moving in the direction of the rotation axis Z along the cylinder 5 reciprocates in the direction of the rotation axis Z, the pin 7b is used as a guide when the piston rod 7 reciprocates. The piston 13 is guided in the direction of the rotation axis Z by the groove 13a.
Further, it is possible to prevent a force other than the force in the direction of the rotation axis Z from acting on the cylinder 5.

According to the first embodiment of the rotary motion / reciprocating motion converter, the following effects can be obtained. 1. A plurality of pistons arranged in parallel can be easily reciprocated with low friction by rotating the rotation shaft. 2. The axial length of the entire drive device can be reduced. 3. Since the rotation of the inclined member 3 can be automatically prevented, the entire driving device can be made compact and low in cost. 4. The inclination angle θ is made larger than that of the conventional one, so that a longer stroke can be given to the piston. 5. The number of pistons can be arbitrarily selected, including odd numbers. Also, the arm lengths may be different. Therefore, the rotary motion / reciprocating motion converter according to the first embodiment can constitute a low-friction compact and highly efficient multi-piston pump, compressor, vacuum pump expander, actuator, multi-piston internal combustion engine, Stirling cycle device, etc. it can.

(Embodiment 2) FIG. 6 is a detailed explanatory view of the inclined side connecting member and the reciprocating side connecting member of Embodiment 2 of the rotary motion / reciprocating motion converter of the present invention. It is a corresponding figure. FIG. 7 is a perspective view of a main part of the reciprocating side connecting member shown in FIG. 6 and corresponds to FIG. 5 of the first embodiment. In the description of the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The second embodiment differs from the first embodiment in the following points, but has the same configuration as the first embodiment in other points. A shaft support member 17 is rotatably supported around the axis of the arm 3a by bearings 16 at the tip of the arm 3a of the inclined member 3. The shaft support member 17 is a bifurcated member having a pair of shaft support portions 17a, 17a (only one is shown in FIG. 6) that are spaced apart in a direction perpendicular to the plane of FIG. The support shaft 18 supported by the shaft support member 17 extends in a direction perpendicular to the plane of FIG.

A holding member (inclined side connecting member) 19 is rotatably connected to the support shaft 18. The clamped member 19 is a substantially columnar member, and has low friction plate housing recesses 19a, 19a formed on the upper end surface and the lower end surface, respectively. C of the piston rod (reciprocating connecting member) 7
A pair of low friction plate housing recesses 8, 8 vertically separated (in the direction of the rotation axis) are formed in the lower end portion 7 a of the character shape. That is, in the second embodiment, the pair of low friction plate housing recesses 8, 8 of the C-shaped lower end portion 7 a of the piston rod 7 are configured as reciprocating side connecting members (holding members) 8, 8. The bottom surfaces 8a, 8a of the low friction plate housing recesses (reciprocating side connecting member, holding member) 8, 8 are formed of a pair of holding surfaces 8 parallel to each other and separated in the rotation axis Z direction.
a, 8a. A low friction plate 20 is accommodated between the low friction plate accommodating recesses 19a and 8. The low friction plate 20 is formed of a disk having a plurality of rotatable balls 20a.

(Effects of the Second Embodiment) In the second embodiment having the above-described structure, a pair of low friction plate housing recesses 8 provided at the lower end of the piston rod 7 in the direction of the rotation axis Z,
The columnar clamped member 19 is clamped by the bottom surfaces (clamping surfaces) 8a, 8a of the cylinder 8 via the low friction plate 20. The held member 19 is relatively movable in a direction along the bottom surface of the low friction plate housing recesses 8, 8, and is relatively immovable in a direction perpendicular to the bottom surface (a direction along the rotation axis Z). is there. For this reason, as the held member 19 reciprocates in the direction of the rotation axis Z while performing the rotary oscillating motion, the holding member (reciprocating side connecting member) 7a of the piston rod (reciprocating member) 7a is moved. The pair of holding surfaces (the bottom surfaces of the low friction plate housing recesses 8, 8) 8a, 8a reciprocate in the direction of the rotation axis Z. Therefore, in the second embodiment, similarly to the first embodiment, the held member 19 is displaced from the bottom surface of the low-friction plate receiving recesses 8 and 8 even if the held member 19 is moved up and down by the rotation of the rotating shaft A. The piston 6 and the piston rod 7 can be smoothly reciprocated while performing the motion of the projection circle E which is small.

(Embodiment 3) FIG. 8 is a detailed explanatory view of the inclined side connecting member and the reciprocating side connecting member of Embodiment 3 of the rotary motion / reciprocating motion converter of the present invention. It is a corresponding figure. FIG. 9 is a perspective view of the portion shown in FIG. 8 and corresponds to FIG. 5 of the first embodiment. In the description of the third embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The third embodiment differs from the first embodiment in the following points, but has the same configuration as the first embodiment in other points.

The piston rod (reciprocating connecting member)
The rotating ball support shaft 21 is supported by the shaft support 7d at the lower end of the shaft 7. The rotating ball support shaft 21 is arranged substantially perpendicular to the reciprocating movement direction (direction along the rotation axis Z) and substantially perpendicular to the direction in which the arm 3a of the inclined member 3 extends. A rotating ball (reciprocating side connecting member) 22 is rotatably supported on the rotating ball support shaft 21. The inclined member 3
A shaft 23a of a holding member (inclined side connecting member) 23 for rotatably holding the rotating sphere 22 is provided at the tip of the arm 3a.
Fixedly supported. The holding member 23 is provided with the rotating ball 2.
2 has a pair of holding surfaces 23b, 23b for holding the rotatable member 2 rotatably.

(Effect of Embodiment 3) In Embodiment 3 of the rotary motion / reciprocating motion converter having the above configuration, when the rotation axis A is rotated around the rotation axis Z (see FIG. 3), the rotation axis Z
The Z-shaped shaft portion formed by the inclined shaft portion 1a provided along the inclined axis line Z 'and the connecting shaft portions 1b connected to both ends of the inclined shaft portion 1a also rotates around the rotation axis line Z. Rotate. The inclined member 3 (see FIGS. 8 and 9) rotatably mounted on the inclined shaft 1a of the Z-shaped shaft cannot rotate around the rotation axis Z. Therefore, when the rotation axis A rotates, the inclination direction of the inclination shaft portion 1a (see FIG. 3) rotates. At this time, the inclination direction of the inclination member 3 rotates. At this time, a plurality of holding members (inclined side connecting members) 23 supported by the inclined member 3 shown in FIGS.
Reciprocates in the direction of the rotation axis Z while performing a rotary oscillating motion.

A rotating sphere (reciprocating side connecting member) 22 supported on the other end of each of the plurality of piston rods (reciprocating connecting member) 7 reciprocating in the direction of the rotation axis Z is connected to the holding member (inclination side connecting member). The member 23 is clamped and connected by the clamping surfaces 23b, 23b. The holding surface 23 of the holding member 23
When the holding member 23 reciprocates in the direction of the rotation axis Z while performing the rotary oscillating motion in a state where the rotation balls 22 b and 23 b are connected to the rotation ball 22, the rotation ball 22 and the piston rod 7 are also connected to the rotation axis Z. Reciprocate in the direction. At this time, the holding surface 23 is
a and 23a relatively move the projection circle E in a plane substantially perpendicular to the reciprocating direction (the direction of the rotation axis Z). Therefore, even if a force in a direction perpendicular to the reciprocating movement direction (rotational axis direction) acts between the holding member 23 and the rotating ball (reciprocating side connecting member) 22, a large frictional resistance force is not generated. Low loss. Therefore, even if a relatively small circular motion occurs in the direction perpendicular to the reciprocating movement direction between the holding member (inclined side connecting member) 23 and the rotating sphere (reciprocating side connecting member) 22, the relative circle is generated. Since the frictional force due to the movement can be reduced, the energy loss can be reduced.

[0050]

The rotary motion / reciprocating motion converter according to the present invention has the following effects. (E01) The rotary motion and the linear reciprocating motion of multiple axes can be efficiently converted between the rotary shaft and the linear reciprocating member. (E02) It is possible to provide a rotary motion / reciprocating motion conversion device capable of reducing the frictional force generated when converting the rotary motion / reciprocating motion and increasing the stroke of the linear reciprocating motion.

[Brief description of the drawings]

FIG. 1 is an overall explanatory view of a rotary motion / reciprocating motion converter according to the present invention.

FIG. 2 is an operation explanatory view of the present invention shown in FIG. 1;

FIG. 3 is an overall explanatory view of Embodiment 1 of the rotary motion / reciprocating motion converter of the present invention.

FIG. 4 is a detailed explanatory view of the inclined side connecting member and the reciprocating side connecting member shown in FIG. 3;

FIG. 5 is a perspective view of an essential part of the reciprocating side connecting member shown in FIG. 4;

FIG. 6 is a detailed explanatory view of the inclined side connecting member and the reciprocating side connecting member of the rotary motion / reciprocating motion conversion device according to the second embodiment of the present invention, and is a diagram corresponding to FIG. 4 of the first embodiment. is there.

FIG. 7 is a perspective view of a main part of the reciprocating side connecting member shown in FIG. 6, and is a view corresponding to FIG. 5 of the first embodiment.

FIG. 8 is a detailed explanatory view of the inclined side connecting member and the reciprocating side connecting member of Embodiment 3 of the rotary motion / reciprocating motion converter of the present invention, and is a view corresponding to FIG. 4 of Embodiment 1; is there.

FIG. 9 is a perspective view of a portion shown in FIG. 8 and corresponds to FIG. 5 of the first embodiment.

FIG. 10 is an explanatory view of a prior art of a rotary motion / reciprocating motion conversion device, and is an explanatory view of an inclined plate driving method.

FIG. 11 is an explanatory view of a star-shaped multi-arm rod system using a Z-shaft, which is a conventional technology of a rotary motion / reciprocating motion converter.

[Explanation of symbols]

A: rotation axis, Z: rotation axis, Z ': inclined axis, 1a: inclined axis, 1b: connection axis, 3: inclined member, 3a: arm,
Reference numeral 4: inclined connecting member (member to be clamped), 6: reciprocating member, 7: reciprocating connecting member, 8: reciprocating member (clamping member), 8a: clamping surface, 22: reciprocating member (rotating ball) ), 23 ... inclined side connecting member (holding member).

Claims (2)

[Claims] 1. A rotary motion / reciprocating motion converting device having the following requirements (A01) to (A06): (A01) a tilt shaft provided along a tilt axis tilted with respect to the rotation axis; A rotating shaft rotatable about the rotation axis, the rotating shaft having a Z-shaped shaft portion connected to both ends of the shaft portion, (A02) being rotatably mounted on the inclined shaft portion, An inclined member that cannot rotate around the rotation axis (A03)
A plurality of inclined side connecting members supported by the inclined member, wherein when the rotating shaft is rotated, it is a figure-eight movement perpendicular to the rotational axis and viewed from a linear direction passing through the inclined side connecting member; (A04) one end connected to each of a plurality of reciprocating members reciprocating in the direction of the rotation axis; A plurality of reciprocating connecting members supporting a reciprocating side connecting member connected to the inclined side connecting member, (A05) reciprocating in the direction of the rotation axis when the inclined side connecting member performs a rotational sliding motion. The reciprocating side connecting member, (A06) a pair of clamping surfaces arranged apart from each other in the direction of the rotation axis, and a relative movement in a direction perpendicular to the pair of clamping surfaces and a relative movement in a direction along the clamping surface; Capable pinched The reciprocating-side connecting member constituting the inclined side connecting member and the other constitutes one of the members. 2. The rotary / reciprocating motion conversion device according to claim 1, which has the following requirements (A07) and (A08): (A07) A piston is supported by each of the plurality of cylinders so as to be able to reciprocate. (A08) The reciprocating connection member comprising a piston rod having one end connected to the piston and the reciprocating connection member provided at the other end.