JP2000346161A - Linear motion-rotary motion converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motion-rotary motion converter capable of composing easily and inexpensively assembly works, reducing noise and partial wear, and obtaining steady operation. SOLUTION: A planetary mechanism 30 composing a hypocycloid mechanism is connected with one of connecting part 28a of a connecting pin 28 arranged on a connecting rod 26. Conversion between linear motion and rotary motion are performed between a crankshaft 32 and the connecting rod 26. A driven crank mechanism 50 having a rotator 54 capable of rotating around a concentric axis with an axial center S1 of the crankshaft 32 and a driven crank 58 arranged on the rotator 54 and capable of relatively rotating coaxially with an axial center S2 of the planetary gear 38 is arranged on a side placed opposite to the planetary mechanism 30 holding the connecting rod 26. The driven crank 58 is connected with the other connecting part 28b of the connecting pin 28 to perform planetary rotation (revolution and rotation) by synchronizing with the planetary gear 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motion / rotational motion conversion device, and more particularly, to a linear motion which is easy to assemble, is inexpensive, has low noise and uneven wear, and provides stable operation. The present invention relates to a rotary motion conversion device.

[0002]

2. Description of the Related Art A linear member movable in a straight line direction and a rotating member rotatable about a center line orthogonal to the straight line are mechanically connected to each other, and the linear member is moved in the linear direction. The linear motion of the rotary member is converted into a rotary motion to rotate the rotary member about one center line, or the rotary motion of the rotary member about one center line is converted into a linear motion, and the linear motion member is linearly reciprocated in a linear direction. One type of linear motion-rotational motion conversion device that utilizes a hypocycloid mechanism is known. That is, (a) a sun internal gear disposed concentrically with the one center line, a support member rotatably disposed around the one center line, and a half diameter of the sun internal gear. A planetary gear device having a planetary gear that is rotatably disposed around its own axis on the support member while being engaged with the sun internal gear, and (b) on a pitch circle of the planetary gear. And a connecting pin for connecting the planetary gear and the linear moving member so as to be relatively rotatable, and the supporting member is connected to the rotating member to be integrally rotated. The device described in Japanese Patent Application Laid-Open No. 7-305601 is an example of such a device, and FIG. 8 illustrates a device in which a pair of planetary gear devices are disposed symmetrically with a linear motion member interposed therebetween. Stagnation is prevented and stable operation is obtained.

[0003]

However, when such a pair of planetary gear units is provided, not only the number of parts is increased but also the phase of the left and right planetary gear units is required, and the assembly is troublesome. And the manufacturing cost increases. Also, if the load is not evenly applied to the pair of planetary gear devices,
Rotating shafts (output shafts, etc.) parallel to one center line because there is a possibility that noise (abnormal noise) and uneven wear may occur due to different meshing loads.
Is provided to mechanically connect the support members of both planetary gear units by means of gears to rotate them synchronously, which makes the unit more complicated and expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an easy assembling work, a low-cost structure, and a stable operation with less noise and uneven wear. It is an object of the present invention to provide a linear motion-rotational motion conversion device.

[0005]

In order to achieve the above object, the present invention provides a linear member which can move in a straight line,
A rotating member rotatable about a center line orthogonal to the straight line, and mechanically connecting the rotating member to a linear motion of the linear moving member in a straight line direction to convert the rotating member into a rotary motion; A linear motion-rotational motion conversion device for rotating the rotary member about a center line or converting the rotary motion of the rotary member about the one center line into a linear motion and linearly reciprocating the linear motion member in the linear direction. (A) a sun internal gear disposed concentrically with the one center line, and a first internal gear rotatably disposed about the one center line and connected to the rotating member to be integrally rotated. A supporting member, and a planetary gear having a diameter dimension of half of the sun internal gear, meshing with the sun internal gear, and being rotatably disposed on the first support member around its own axis. A planetary gear set having: (b) The linear motion member is rotatably disposed around an axis parallel to the center line, and one of a pair of connecting portions protruding from both sides of the linear motion member is disposed on the pitch circle of the planetary gear. (C) a second support member rotatably disposed around the one center line, and a second support member on an extension of the axis of the planetary gear. An auxiliary planetary member which is disposed on the member so as to be relatively rotatable around an extension thereof, and is connected to the other connecting portion of the connecting pin so as to be relatively non-rotatable. An auxiliary rotation device disposed on the opposite side to the planetary gear device;
It is characterized by having.

[0006]

In such a linear motion-rotational motion converting device, a planetary gear device constituting a hypocycloid mechanism is connected to one connecting portion of a connecting pin provided on the linear motion member. (1) Conversion between linear motion and rotational motion is performed between a rotary member and a linear motion member connected to the support member. An auxiliary rotation device is disposed on the opposite side of the planetary gear device with respect to the linear motion member. Since the auxiliary planet member is connected to the other connecting portion of the connecting pin and is caused to rotate in a planetary manner (revolution and rotation) in synchronism with the planetary gear of the planetary gear device, twisting and rattling are prevented and stable. Operation is obtained. Further, both the second support member and the auxiliary planetary member of the auxiliary rotation device are rotatably disposed and are only driven and rotated via the connecting pins, and do not rotate in a meshing manner. As a result, the number of parts is small, the phase adjustment of the meshing teeth is not required, the assembly is simple, and the manufacturing cost is reduced. In addition, since the auxiliary rotation device does not engage and rotate as described above, the first rotation of the planetary gear device is performed.
Even when a rotating member is connected only to the support member to input and output rotational force, noise (abnormal noise) and uneven wear caused by the difference in load are suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, the linear motion-rotational motion converting device of the present invention converts a linear motion of an engine piston into a rotary motion of a crankshaft, and converts a rotary motion of an electric motor or the like into a compressor. The present invention can be applied to various devices such as a device that converts a linear reciprocating motion of a piston.

A rotary member is connected to the first support member of the planetary gear device. However, they can be integrally formed, or the first support member can be used as it is as a rotary member. The rotating member may be the output shaft or the input shaft as it is, but the shaft member is disposed so as to be rotatable around the axis parallel to one center line, and the shaft member and the rotating member are connected to a gear, a timing belt, or the like. In this case, the rotational force may be input and output via a rotating member, for example, the shaft member may be used as an output shaft or an input shaft.

In the auxiliary rotating device, the auxiliary planetary member is planetary-rotated through the connecting pin. A synchronizing device is provided between the first supporting member (rotating member) and the second supporting member, and both are mechanically connected. It is also possible to make them rotate synchronously.
Specifically, a counter shaft is rotatably arranged around the axis in parallel with one center line, and the first support member (rotating member) and the second support member are provided via a mechanical transmission device such as a gear or a timing belt. What is necessary is just to connect to each member. In that case,
The operation is more stable, and the generation of noise (abnormal noise) and uneven wear is suppressed. In addition, not only can the rotating member connected to the first support member be used as an input shaft or an output shaft, but also the counter shaft can be used as an input shaft or an output shaft.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a longitudinal sectional view of a crank device 10 which is an embodiment of the linear motion-rotational motion converting device of the present invention, FIG. 1B is a bb sectional view of FIG. 1A, and FIG. Is
FIG. 9A is a cross-sectional view taken along the line cc in FIG.
A planetary mechanism 30 and a driven crank mechanism 50 are provided. The piston mechanism 20 includes a piston 24 slidably disposed in a cylindrical cylinder 22 in the axial direction (vertical direction in FIG. 1A) and a connecting rod 26 connected to the piston 24. A connecting pin 28 is attached to the lower end of the connecting rod 26 via a bearing so as to be rotatable about the axis S3. The lower end of the cylinder 22 is integrally fixed to the upper surface of the rectangular parallelepiped main body housing 12,
The lower end of the connecting rod 26 projects into the main body housing 12 from the opening 14 provided in the main body housing 12.
Since the piston 24 and the connecting rod 26 are linearly reciprocated in the up and down direction, they may be integrally formed, or may be connected by a piston pin or the like. In this embodiment, the connecting rod 26 is a linear moving member, and the moving direction of the connecting rod 26 in the vertical direction in FIG.
Numeral 8 is disposed such that its axis S3 is orthogonal to the straight line direction (the left-right direction in FIG. 1A).

The planetary mechanism 30 is rotatably mounted on the main body housing 12 so as to be rotatable about an axis S1 which is orthogonal to a vertical line which is a moving path of the connecting rod 26 and which is parallel to the axis S3 of the connecting pin 28. A crankshaft 32 pivotally supported and having one end inserted into the main body housing 12, a crank arm 34 integrally provided at one end of the crankshaft 32, and an axial center provided at a tip end of the crank arm 34 A planetary gear 38 rotatably disposed about a crank pin 36 parallel to S1; and a sun internal gear 40 disposed fixedly in the main housing 14 concentrically with the axis S1. The gear 38 meshes with the sun internal gear 40 and revolves around its own axis S2 while revolving around its axis S1. The crankshaft 32 corresponds to a rotating member, and its axis S1 corresponds to one center line. Further, the planetary mechanism 30 corresponds to a planetary gear device, and the crank arm 34 corresponds to a first support member.

The diameter of the sun internal gear 40 is 4 L,
The diameter of the planetary gear 38 is Ｌ of 2L, and the separation distance between the axis S1 and the axis S2 is 更 に of that.
Is set to L. Further, as shown in FIG. 1, the state where the axis S2 of the planetary gear 38 is held at the upper end position directly above the axis S1, in other words, the axis S2 is
In the state of being located on a straight line which is the movement path of the planetary gear 38, a projection 42 is provided at a portion on the pitch circle of the planetary gear 38 which meshes with the sun internal gear 40, and the connection pin 28 is connected thereto. . Both ends of the connecting pin 28 protrude to both sides of the connecting rod 26 as shown in FIG.
A pair of connecting portions 28a and 28b each of which is chamfered to form a flat surface parallel to the axis S3 is provided, and the protrusion 42 prevents the right connecting portion 28a from rotating relative to the axis S3. Are linked.

As a result, when the connecting rod 26 is linearly moved downward from the state shown in FIG. 1 by a dimension 4L, which is the diameter of the sun internal gear 40, the planetary gear 38 rotates 180 ° about the axis S1 (revolution). ) And the axis S2
It is rotated (rotated) by 180 ° in the opposite direction,
The state of (c) is positioned at a lower end position symmetrical with respect to the axis S1. When the connecting rod 26 is linearly moved upward by 4 L from this state, the planetary gear 38 is rotated (revolved) by 180 ° around the axis S1 and is rotated by 180 ° in the opposite direction around the axis S2 ( (Rotation) and positioned at the upper end position shown in FIG. That is, a hypocycloid mechanism is configured. When the connecting rod 26 is reciprocated by a dimension of 4 L on a straight line orthogonal to the axis S1, the planetary gear 38 is moved to its own axis S2.
One revolution (revolution) is made around the axis S1 while rotating (rotating) around, and the crankshaft 32 is made one revolution accordingly. Conversely, when the crankshaft 32 is rotated one revolution about the axis S1, the planetary gear 38 becomes its own axis S2.
One rotation (revolution) is made around the axis S1 while rotating (rotating) around, and the connecting rod 26 is reciprocated by a dimension of 4L on a straight line orthogonal to the axis S1.

On the other hand, the driven crank mechanism 50 is provided on the opposite side of the planetary mechanism 30 with the connecting rod 26 interposed in the main body housing 12, and rotates through the bearing 52 around the axis S 1. A rotating body 54 that is disposed so as to be able to rotate and a rotating body 54 on an extension of the axis S2.
And a driven crank 58 which is disposed via a bearing 56 so as to be rotatable relative to the axis S2. The other end of the connecting pin 28, that is, the left connecting portion 28 b in FIG. 1A is connected to the driven crank 58 so as to be relatively non-rotatable, and changes its attitude in the same manner as the planetary gear 38. That is, when the connecting rod 26 is linearly reciprocated, the driven crank 58 is rotated (rotated) around the axis S2 in the same manner as the planetary gear 38, and is rotated (rotated) around the axis S1 by the rotation of the rotating body 54. Orbit). Conversely, the crankshaft 32 is connected to the shaft center S1.
When the driven crank 58 is rotated around, like the planetary gear 38, the driven crank 58 is rotated (revolved) around the axis S1 while rotating (rotating) around the axis S2. The crank mechanism 50 corresponds to an auxiliary rotating device. The rotating body 54 corresponds to a second support member, and the driven crank 58 corresponds to an auxiliary planetary member.

And, such a crank device 10 is
It is used for various linear motion-rotational motion converting devices. For example, when used for a compressor, an electric motor is connected to a crankshaft 32 to provide a rotational driving force, and the compressor is configured using a piston mechanism 20. The compressor can be operated by the reciprocating motion of the piston 24 accompanying the rotation of the crankshaft 32. In the case where the piston 24 is used for an internal combustion engine or the like and the piston 24 is reciprocated by configuring the internal combustion engine using the piston mechanism 20, the crankshaft 32 is driven to rotate.

Here, according to the crank device 10 of the present embodiment, the connecting pin 28 provided on the connecting rod 26 is used.
A planetary mechanism 30 that constitutes a hypocycloid mechanism is connected to one of the connecting portions 28a. A linear motion-rotational motion is converted between the crankshaft 32 and the connecting rod 26. On the other side of the planetary mechanism 30, a driven crank mechanism 50 is disposed, and the driven crank 58 is connected to the other connecting portion 28b of the connecting pin 28, and performs planetary rotation (revolution and rotation) in synchronization with the planetary gear 38. As a result, the connecting rod 26 is prevented from being twisted or twisted, and stable operation can be obtained.

The rotating body 54 of the driven crank mechanism 50
Each of the driven cranks 58 is rotatably disposed via bearings 52 and 56, and is only driven and rotated via the connecting pins 28, and does not rotate in a meshing manner. The number of parts is smaller than in the case of disposing, and the phase adjustment of the meshing teeth is not required, the assembling is simple, and the manufacturing cost is reduced. In addition, since the driven crank mechanism 50 does not engage and rotate as described above, even when the rotational force is input and output using only the crankshaft 32 of the planetary mechanism 30, noise (abnormal noise) and uneven wear due to the difference in load are caused. Generation is suppressed.

In the above example, the rotational force is input and output by using only the crankshaft 32 of the planetary mechanism 30. However, as shown in FIG. A synchronization device 60 is provided between the
Both can be mechanically rotated synchronously. The synchronizer 60 includes a shaft portion 62 provided integrally with the rotating body 54 concentrically with the shaft center S1 of the crankshaft 32, and a counter shaft provided rotatably around an axis parallel to the shaft center S1. 64, its countershaft 64 and crankshaft 32,
The gear train is provided with two sets of gear trains 66 and 68 which are arranged between the shaft portion 62 and meshed and rotated.
In this case, the operation is further stabilized, and the generation of noise (abnormal noise) and uneven wear is suppressed. Further, the counter shaft 64 can be used as an input shaft or an output shaft.

The embodiments of the present invention have been described in detail with reference to the drawings. However, these embodiments are merely one embodiment, and the present invention is based on the knowledge of those skilled in the art. Can be implemented.

[Brief description of the drawings]

1A and 1B are diagrams illustrating a crank device according to an embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. 1B is a sectional view taken along line bb in FIG. 1A, and FIG. It is cc sectional drawing.

FIG. 2 is a view for explaining another embodiment of the present invention.
It is a figure corresponding to (a).

[Explanation of symbols]

10: Crank device (linear motion-rotational motion conversion device)
26: Connecting rod (linear member) 28: Connecting pin 2
8a, 28b: connecting portion 30: planetary mechanism (planetary gear device) 32: crankshaft (rotating member) 34: crank arm (first support member) 38: planetary gear 4
0: sun internal gear 50: driven crank mechanism (auxiliary rotation device) 54: rotating body (second support member) 58: driven crank (auxiliary planetary member) S1: axis of crankshaft (one center line) S2: planetary gear Axis S3: axis of connecting pin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Ui No.11, Nodacho, Kariya, Aichi Prefecture Inside Aisin Kiko Co., Ltd.

Claims (1)

[Claims] 1. A linearly movable member which is movable in a linear direction and a rotary member which is rotatable around a center line orthogonal to the linear line are mechanically connected to each other, and the linearly movable member is linearly movable. The linear motion of the rotary member is converted into a rotary motion to rotate the rotary member about the one center line, or the rotary motion of the rotary member about the one central line is converted into a linear motion to convert the linear motion member into a linear motion. A linear motion-rotational motion conversion device for linearly reciprocating in a straight line direction, comprising: a sun internal gear disposed concentrically with said one center line; and a rotatable around said one center line and said rotation. A first support member connected to a member and rotated integrally therewith, and having a half diameter of the sun internal gear and being engaged with the sun internal gear and having its own shaft attached to the first support member; A planetary gear rotatably disposed about the center. A planetary gear device, which is disposed on the translation member so as to be rotatable around an axis parallel to the one center line, and one of a pair of connecting portions protruding from the translation member to both sides is a planetary gear device. A connecting pin connected to the planetary gear so as to be relatively non-rotatable on the pitch circle; a second support member rotatably disposed about the one center line; and a second support member rotatable around an axis of the planetary gear. An auxiliary planetary member which is disposed on the supporting member so as to be relatively rotatable around the extension line and is connected to the other connecting portion of the connecting pin so as to be relatively non-rotatable. And an auxiliary rotation device disposed on the opposite side of the planetary gear device with respect to the planetary gear device.