Eccentric oscillation device and injection molding device

Abstract

To provide an eccentric oscillation device that does not require a pin and can realize a turning motion without rotating a disk.SOLUTION: An eccentric oscillation device comprises: an input shaft having a first external gear and a second external gear; a planetary gear having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric part eccentric from a rotational axis of the first internal gear; and a sun gear having a second internal gear. The first external gear and the third external gear mesh with each other. The third external gear and the first internal gear mesh with each other. The second external gear and the second internal gear mesh with each other. The input shaft is inserted into the through hole of the hollow eccentric shaft. The sun gear is rotatably and slidably connected to the eccentric part of the hollow eccentric shaft. The rotational axis of the sun gear and the rotational axis of the eccentric part are the same.SELECTED DRAWING: Figure 10A

Description

[Technical Field]

[0001] The present disclosure relates to an eccentric oscillating device and an injection molding device. [Background technology]

[0002] As a means for realizing the turning motion, an eccentric swing type speed reducing mechanism has been disclosed (see Patent Document 1). In such an eccentric oscillating type reduction mechanism, the oscillating motion of the oscillating part occurs during the deceleration stage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-132364 Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional eccentric oscillation mechanisms require pins, which are torque transmission components, and these pins can be subject to large shear loads, which can lead to breakage. These pins are also called inner pins. [Means for solving the problem]

[0005] In order to solve the above problem, one embodiment is an eccentric oscillating device comprising: an input shaft having a first external gear and a second external gear; planetary gears having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric portion eccentric from the rotation axis of the first internal gear; and a sun gear having a second internal gear, wherein the first external gear meshes with the third external gear, the third external gear meshes with the first internal gear, and the second external gear meshes with the second internal gear; the input shaft is inserted into the through hole of the hollow eccentric shaft; the sun gear is connected to the eccentric portion of the hollow eccentric shaft so as to be rotatable and slidable; and the rotation axis of the sun gear and the rotation axis of the eccentric portion are the same.

[0006] In order to solve the above problem, one aspect of the present invention is an injection molding apparatus in which molten resin is discharged from a scroll compression mechanism including an eccentric oscillation device, the eccentric oscillation device comprising: an input shaft having a first external gear and a second external gear; planetary gears having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric portion eccentric from the rotation axis of the first internal gear; and a sun gear having a second internal gear, wherein the first external gear meshes with the third external gear, the third external gear meshes with the first internal gear, and the second external gear meshes with the second internal gear; the input shaft is inserted into the through hole of the hollow eccentric shaft; the sun gear is rotatably and slidably connected to the eccentric portion of the hollow eccentric shaft; and the rotation axis of the sun gear and the rotation axis of the eccentric portion are the same.

[0007] In one aspect to solve the above problem, a planetary gear rotational system includes an a1 input shaft having an a1 external gear and an a2 external gear, an a1 planetary gear having an a3 external gear, an a2 planetary gear having an a4 external gear, an a5 external gear, an a1 hollow eccentric shaft having an a1 eccentric portion eccentric from the a1 rotation axis of the a5 external gear, an a1 through hole, and an a1 sun gear having an a1 internal gear, wherein the a1 external gear and the a3 external gear mesh with each other, and the a the a3 external gear and the a4 external gear mesh, the a4 external gear and the a5 external gear mesh, the a2 external gear and the a1 internal gear mesh, the a1 input shaft is inserted into the a1 through hole of the a1 hollow eccentric shaft, the a1 sun gear is rotatably and slidably connected to the a1 eccentric portion of the a1 hollow eccentric shaft, and the rotation axis of the a1 sun gear and the rotation axis of the a1 eccentric portion are the same. [Brief explanation of the drawings]

[0008] [Figure 1A] 1 is a diagram showing an example of the appearance of an eccentric oscillation device according to an embodiment when viewed from one direction; [Figure 1B] 10 is a diagram showing an example of the appearance of the eccentric oscillation device according to the embodiment when viewed from another direction. FIG. [Figure 2A] 1 is a diagram illustrating an example of a cross section of an eccentric oscillation device according to an embodiment. [Figure 2B] 4A and 4B are diagrams illustrating combinations of meshing gears of the eccentric oscillating device according to the embodiment. [Figure 3] 1A and 1B are diagrams illustrating examples of gear meshing according to an embodiment. [Figure 4] FIG. 4 is a diagram illustrating an example of a rotational sliding portion between a sun gear and an eccentric portion according to an embodiment. [Figure 5A] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment when θ=0°. FIG. [Figure 5B] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=270°. FIG. [Figure 5C] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=540°. FIG. [Figure 5D] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=810°. FIG. [Figure 5E] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=1080°. FIG. [Figure 5F] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment when θ=0°. FIG. [Figure 5G] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=270°. FIG. [Figure 5H] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=540°. FIG. [Figure 5I] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=810°. FIG. [Figure 5J] 10 is a diagram showing an example of a state of the eccentric oscillation device according to the embodiment at θ=1080°. FIG. [Figure 6] 1 is a diagram illustrating an example of a reducer using the configuration of an eccentric oscillating device according to an embodiment. [Figure 7A] 3 is a diagram showing an example of a first compression state of a scroll compressor using the configuration of an eccentric oscillation device according to the embodiment. FIG. [Figure 7B]4 is a diagram showing an example of a second compression state of a scroll compressor using the configuration of an eccentric oscillation device according to an embodiment. FIG. [Figure 7C] 10 is a diagram showing an example of a third compression state of a scroll compressor using the configuration of the eccentric oscillation device according to the embodiment. FIG. [Figure 7D] 10 is a diagram showing an example of a fourth compression state of a scroll compressor using the configuration of the eccentric oscillation device according to the embodiment. FIG. [Figure 8A] 1 is a front view showing a schematic configuration of an injection molding apparatus according to an embodiment. [Figure 8B] 1 is a cross-sectional view showing a schematic configuration of an injection molding apparatus according to an embodiment. [Figure 9A] 1 is a diagram showing an example of the appearance of the a1 eccentric oscillation device according to the embodiment when viewed from one direction. FIG. [Figure 9B] 10 is a diagram showing an example of the appearance of the a1 eccentric oscillation device according to the embodiment when viewed from another direction. FIG. [Figure 10A] 3 is a diagram showing an example of a cross section of the a1 eccentric oscillation device according to the embodiment. FIG. [Figure 10B] 10 is a diagram showing a combination of meshing gears of the a1 eccentric oscillating device according to the embodiment. FIG. [Figure 11A] 10 is a diagram showing a schematic example of a state of the a1 eccentric oscillation device according to the embodiment when θa=0°. FIG. [Figure 11B] 10 is a diagram schematically illustrating an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=270°. FIG. [Figure 11C] 10 is a diagram schematically illustrating an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=540°. FIG. [Figure 11D] FIG. 10 is a diagram schematically illustrating an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=810°. [Figure 11E] 10 is a diagram showing a schematic diagram of an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=1080°. FIG. [Figure 11F] 10 is a diagram showing a schematic example of a state of the a1 eccentric oscillation device according to the embodiment when θa=0°. FIG. [Figure 11G]10 is a diagram schematically illustrating an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=270°. FIG. [Figure 11H] 10 is a diagram schematically illustrating an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=540°. FIG. [Figure 11I] FIG. 10 is a diagram schematically illustrating an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=810°. [Figure 11J] 10 is a diagram showing a schematic diagram of an example of a state of the a1 eccentric oscillation device according to the embodiment when θa=1080°. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings.

[0010] A first embodiment will be described. FIG. 1A is a diagram showing an example of the appearance of an eccentric oscillation device 1 according to an embodiment when viewed from one direction. FIG. 1B is a diagram showing an example of the appearance of the eccentric oscillation device 1 according to the embodiment when viewed from another direction. FIG. 2A is a diagram showing an example of a cross section of the eccentric oscillation device 1 according to the embodiment. FIG. 2B is a diagram showing the meshing combinations of gears of the eccentric oscillating device 1 according to the embodiment. For convenience of explanation, each of FIGS. 1A, 1B, 2A, and 2B shows an XYZ Cartesian coordinate system, which is a three-dimensional Cartesian coordinate system.

[0011] The eccentric oscillation device 1 includes an input shaft A1, four planetary gears, ie, a first planetary gear B1 to a fourth planetary gear B4, a hollow eccentric shaft C1, and a sun gear D1. The input shaft A1 has a first external gear GO1 and a second external gear GO2. The first planetary gear B1 has a third-first external gear GO3-1. The hollow eccentric shaft C1 has a first internal gear GI1, a through hole E1, and an eccentric portion F1 that is eccentric from the rotation axis P1 of the first internal gear GI1. The sun gear D1 has a second internal gear GI2.

[0012] The first external gear GO1 and the third-first external gear GO3-1 mesh with each other. The 3-1st external gear GO3-1 and the 1st internal gear GI1 mesh with each other. The second external gear GO2 and the second internal gear GI2 mesh with each other. The input shaft A1 is inserted into the through hole E1 of the hollow eccentric shaft C1. The sun gear D1 is connected to the eccentric portion F1 of the hollow eccentric shaft C1 so as to be rotatable and slidable. The rotation axis of the sun gear D1 and the rotation axis of the eccentric portion F1 are the same as the rotation axis P1, which is also the axis of the input shaft A1.

[0013] Here, in the example of FIGS. 1A and 1B, the internal gear and the external gear are not shown. In the example of FIGS. 2A and 2B, only the first planetary gear B1 out of the four planetary gears is shown. It is sufficient that one or more planetary gears are provided, and for example, by providing a plurality of planetary gears, the eccentric oscillation can be stabilized.

[0014] FIG. 3 is a diagram illustrating an example of meshing of gears according to the embodiment. For convenience of explanation, FIG. 3 shows an XYZ Cartesian coordinate system similar to that shown in FIG. 1A. FIG. 3 shows the input shaft A1, the first planetary gear B1 to the fourth planetary gear B4, and the hollow eccentric shaft C1.

[0015] The second planetary gear B2 has a 3-2 external gear GO3-2. The first external gear GO1 and the 3-2 external gear GO3-2 mesh with each other. The 3-2 external gear GO3-2 and the first internal gear GI1 mesh with each other. The third planetary gear B3 has a 3-3 external gear GO3-3. The first external gear GO1 and the 3-3 external gear GO3-3 mesh with each other. The 3-3 external gear GO3-3 and the first internal gear GI1 mesh with each other. The fourth planetary gear B4 has a third-fourth external gear GO3-4. The first external gear GO1 and the third-fourth external gear GO3-4 mesh with each other. The third-fourth external gear GO3-4 and the first internal gear GI1 mesh with each other.

[0016] Here, the configuration in which the second external gear GO2 and the second internal gear GI2 mesh together is similar to the configuration in which the 3-2nd external gear GO3-2 and the first internal gear GI1 mesh together, for example, and is not shown in the present embodiment.

[0017] Thus, in this embodiment, the planetary gears include a first planetary gear B1 having a 3-1 external gear GO3-1, a second planetary gear B2 having a 3-2 external gear GO3-2, a third planetary gear B3 having a 3-3 external gear GO3-3, and a fourth planetary gear B4 having a 3-4 external gear GO3-4. As meshing between the first external gear GO1 and the third external gears, the 3-1 external gear GO-1 to the 3-4 external gear GO-4 each mesh with the first external gear GO1.

[0018] FIG. 4 is a diagram showing an example of a rotational sliding portion H1 between the sun gear D1 and the eccentric portion F1 according to the embodiment. For convenience of explanation, FIG. 4 shows an XYZ Cartesian coordinate system similar to that shown in FIG. 1A. In the rotary sliding portion H1, a bearing K1 having a rotor J1 is interposed between the sun gear D1 and the eccentric portion F1. In the example of FIG. 4, for the sake of simplicity, only one rotor J1 out of the multiple rotors is labeled with a reference symbol. In the example of FIG. 4, a ball is used as the rotor J1 of the bearing K1, but as another example, a needle or the like may be used.

[0019] An example of the operation of the eccentric oscillation device 1 will be shown with reference to FIGS. 5A to 5J. FIG. 5A is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment when θ=0°. FIG. 5B is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=270°. FIG. 5C is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=540°. FIG. 5D is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=810°. FIG. 5E is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=1080°.

[0020] FIG. 5F is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment when θ=0°. FIG. 5G is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=270°. FIG. 5H is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=540°. FIG. 5I is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=810°. FIG. 5J is a diagram schematically illustrating an example of the state of the eccentric oscillation device 1 according to the embodiment at θ=1080°.

[0021] For convenience of explanation, each of FIGS. 5A to 5J shows an XYZ Cartesian coordinate system similar to that shown in FIG. 1A. The orientation of the XYZ Cartesian coordinate system is an example for the purpose of explanation, and is not limited to this, and the eccentric oscillation device 1 may be installed in any orientation. In this example, Figures 5A to 5E and Figures 5F to 5J each show the same state of rotation angle θ, but for ease of explanation, the parts shown are different. That is, in this example, the overall operating state at rotation angle θ can be grasped by combining Figures 5A to 5E and Figures 5F to 5J. For this reason, the individual illustrated contents of Figures 5A to 5E and Figures 5F to 5J are not necessarily accurate and are merely schematic for explanation purposes. In this example, for convenience of explanation, the rotation angle is called θ, but an eccentric swing operation is performed.

[0022] In the example of FIGS. 5A to 5J, only the first planetary gear B1 out of the four planetary gears is shown. In this example, the rotation angle θ represents the rotation angle of the input shaft A1. 5A to 5J, a virtual reference frame Q1 is shown to make it easier to understand the state of eccentric oscillation of the eccentric oscillation device 1. The position of the reference frame Q1 is fixed. In addition, in the examples of Figures 5A to 5J, in order to make it easier to understand the rotation angles of each part, the following virtual reference positions are shown: a first reference position M1 of the input shaft A1, a second reference position M2 of the first planetary gear B1, a third reference position M3 of the hollow eccentric shaft C1, and a fourth reference position M4 of the sun gear D1.

[0023] 5A and 5F also show a first rotation direction R1 of the input shaft A1, a second rotation direction R2 of the first planetary gear B1, and a third rotation direction R3 of the hollow eccentric shaft C1. The second rotation direction R2 and the third rotation direction R3 are the same rotation direction, and the second rotation direction R2 and the third rotation direction R3 are opposite rotation directions to the first rotation direction R1. Sun gear D1 does not rotate. In this example, the first rotation direction R1 of the input shaft A1 is referred to as the positive rotation direction, and the second rotation direction R2 of the first planetary gear B1 is referred to as the negative rotation direction, but this is not limited to this and the positive and negative directions may be reversed.

[0024] The eccentric oscillation device 1 generally performs first to fifth operations. The first operation is an operation in which forward rotational power is input to the input shaft A1. The second action is an action in which the sun gear D1 rotates forward due to the first action. This rotation corresponds to a rotation on its axis. However, due to the subsequent actions, the sun gear D1 does not actually rotate. The third action is an action in which the first planetary gear B1 rotates in the negative direction. The actions of the second planetary gear B2 to the fourth planetary gear B4 are the same as the action of the first planetary gear B1. The fourth action is an action in which the hollow eccentric shaft C1 rotates in the negative direction. The fifth operation is an operation in which the sun gear D1 rotates eccentrically on the hollow eccentric shaft C1 relative to the input shaft A1. This rotation corresponds to an orbital movement. In this example, the rotation and revolution of the sun gear D1 cancel each other out, so the sun gear D1 does not rotate.

[0025] As described above, in the eccentric oscillating device 1 according to this embodiment, the disk that is the sun gear D1 is rotated in the opposite direction while revolving around a predetermined axis, thereby enabling the disk to perform a pivoting motion without rotating. Therefore, in the eccentric oscillating device 1 according to this embodiment, the sun gear D1 rotates in the positive direction while revolving in the negative direction at the same period, thereby eccentrically oscillating around the input shaft A1.

[0026] In this way, in this embodiment, an eccentric swing motion mechanism can be realized. The eccentric oscillating motion mechanism generally comprises a hollow eccentric shaft C1, an input shaft A1 that is a shaft that passes through the hollow shaft, a sun gear D1 that is a member that is eccentrically arranged on the hollow shaft, and a mechanism that transmits the rotational power input to the shaft to the member. Therefore, in this embodiment, the disk that is the sun gear D1 revolves around a predetermined axis while rotating in the opposite direction, thereby enabling the disk to orbit without rotating. In this way, by combining rotation and revolution, this embodiment can achieve a similar eccentric swing motion without using pins that have a risk of shear fracture for torque transmission.

[0027] Let me explain this. For example, when realizing a reduction mechanism with a high reduction ratio, it is effective to have a sun gear eccentrically oscillate within an internal gear, so that the internal gear rotates one tooth for each revolution of the sun gear's eccentric oscillation. Here, the sun gear revolves around a certain axis without rotating itself. To achieve this movement, the sun gear is first placed eccentrically with respect to the motor shaft so that the rotation of the motor shaft is used as input to cause the sun gear to oscillate eccentrically. When the motor shaft is rotated in this state, the sun gear rotates around the eccentric axis. For example, when the motor rotates 90° clockwise, the sun gear, which is placed eccentrically beyond it, also rotates 90° clockwise. In contrast to this, in the conventional example, a pin is used to restrict the motion locus so that the sun gear does not rotate following the rotation. On the other hand, in this embodiment, the sun gear itself is rotated in the reverse direction at the same time, so that the sun gear appears to be stationary.

[0028] FIG. 6 is a diagram showing an example of a reducer 601 using the configuration of the eccentric oscillating device according to the embodiment. Fig. 6, using Fig. 5A, schematically shows the general configuration of a reducer 601. For convenience of explanation, Fig. 6 shows an XYZ Cartesian coordinate system similar to Fig. 5A. The reducer 601 includes an a-th eccentric oscillation device 1a and an output shaft V1. The a-th eccentric oscillating device 1a is different from the eccentric oscillating device 1 shown in Fig. 5A in the configuration of the sun gear, but other configurations are similar. In the example of Fig. 6, for the sake of convenience of explanation, the a-th eccentric oscillating device 1a has the same components as the eccentric oscillating device 1 denoted by the same reference numerals.

[0029] The a-th sun gear D1a of the a-th eccentric oscillating device 1a has a configuration similar to that of the sun gear D1, and further has a fourth external gear GO4. The output shaft V1 has a third internal gear GI3. The fourth external gear GO4 and the third internal gear GI3 mesh with each other. In the example of FIG. 6, detailed illustration of the fourth external gear GO4 and the third internal gear GI3 is omitted, and only the portions where they exist are denoted by reference numerals.

[0030] In such a reducer 601, power in a rotational direction opposite to the first rotational direction R1 of the input shaft A1 is extracted from the output shaft V1. In this case, in the reducer 601, the a-th sun gear D1a rotates in the positive direction while revolving in the negative direction at the same period, causing the a-th sun gear D1a to eccentrically oscillate around the input shaft A1, and this is received by the output shaft V1, thereby obtaining a negative output with a high reduction ratio. The speed ratio between the input shaft A1 and the hollow eccentric shaft C1 is equal to the speed ratio between the input shaft A1 and the a-th sun gear D1a.

[0031] A second embodiment will be described. FIG. 7A is a diagram showing an example of a first compression state of a scroll compressor 701 using the configuration of the eccentric oscillation device according to the embodiment. FIG. 7B is a diagram showing an example of the second compression state of the scroll compressor 701 using the configuration of the eccentric oscillation device according to the embodiment. FIG. 7C is a diagram showing an example of a third compression state of the scroll compressor 701 using the configuration of the eccentric oscillation device according to the embodiment. FIG. 7D is a diagram showing an example of a fourth compression state of the scroll compressor 701 using the configuration of the eccentric oscillation device according to the embodiment. In this embodiment, for convenience of explanation, the four states for explaining the principle of the scroll compressor 701 are called the first compression state to the fourth compression state, but they may be called by other names.

[0032] The scroll compressor 701 includes a fixed scroll 711 , an orbiting scroll 712 , and a compression chamber 713 . The scroll compressor 701 also has a first suction port 721 through which air is drawn, a second suction port 722 through which air is drawn, and a discharge port 731 through which air is discharged.

[0033] In this embodiment, the orbiting scroll 712 has a configuration similar to that of the eccentric oscillation device 1. Schematically, the configuration of the eccentric oscillation device 1 is applied to the orbiting scroll 712 so that the eccentric oscillation of the orbiting scroll 712 shown in FIGS. The fixed scroll 711 is installed at a fixed position and does not move.

[0034] In the scroll compressor 701, the orbiting scroll 712 orbits in the order of the first compression state, the second compression state, the third compression state, and the fourth compression state, thereby performing a compression operation. Specifically, as the orbiting scroll 712 rotates in the order of the first compression state, the second compression state, the third compression state, and the fourth compression state, the volume of the compression chamber 713 gradually decreases, causing the air to be compressed and discharged from the discharge port 731 located in the center. After the fourth compressed state, the state returns to the first compressed state.

[0035] The schematic configuration of an injection molding apparatus 10 using a scroll compressor 701 will be described with reference to FIGS. 8A and 8B. For convenience of explanation, an XYZ Cartesian coordinate system, which is a three-dimensional Cartesian coordinate system, is shown in Figures 8A and 8B. Note that the XYZ Cartesian coordinate system in Figures 8A and 8B is for the purpose of explaining Figures 8A and 8B, and may be independent of the XYZ Cartesian coordinate systems in other figures. The X and Y directions are parallel to the horizontal plane, and the Z direction is opposite to the direction of gravity.

[0036] FIG. 8A is a front view showing a schematic configuration of the injection molding apparatus 10 according to the embodiment. The injection molding apparatus 10 includes an injection unit 100, a mold clamping unit 200, a molding die 300, a refrigerant supply unit 400, and a control unit 500. In this embodiment, the injection unit 100, the mold clamping unit 200, the refrigerant supply unit 400, and the control unit 500 are fixed to a base 20. An operation panel 30 is provided on the front of the base 20.

[0037] A hopper 101 into which molding material, which is the material for the molded product, is charged is connected to the injection unit 100. For example, pellet-like or powder-like molding material is charged into the hopper 101. For example, a thermoplastic resin or a thermoplastic elastomer is used as the molding material.

[0038] Casting mold 300 has a fixed mold 310 and a movable mold 320 that faces fixed mold 310. Fixed mold 310 and movable mold 320 are each fixed to mold clamping unit 200. Casting mold 300 has a cavity defined by fixed mold 310 and movable mold 320, and a runner that communicates with the cavity. Mold clamping unit 200 opens and closes casting mold 300 by moving movable mold 320 relative to fixed mold 310.

[0039] The injection unit 100 plasticizes the molding material supplied from the hopper 101 and injects the plasticized molding material into the cavity via a runner. Plasticization is a concept that includes melting, and refers to changing a material from a solid to a fluid state. Specifically, for materials that undergo glass transition, plasticization refers to raising the temperature of the material above its glass transition point. For materials that do not undergo glass transition, plasticization refers to raising the temperature of the material above its melting point. The molding material is injected into the cavity, where it cools and hardens, producing the molding material.

[0040] Coolant supply unit 400 is connected to casting mold 300 by piping (not shown), and supplies a coolant to casting mold 300 via this piping. In this embodiment, coolant supply unit 400 is configured by a chiller. Water, for example, is used as the coolant.

[0041] The control unit 500 controls the injection unit 100, the mold clamping unit 200, the coolant supply unit 400, and a drive unit that drives a cutting mechanism (not shown) provided inside the movable mold 320. The control unit 500 is configured by a computer that includes one or more processors, a main memory device, and an input / output interface that inputs and outputs signals from and to the outside. The control unit 500 manufactures molded products by having the processor load a program into the main memory device and execute a predetermined injection molding process.

[0042] FIG. 8B is a cross-sectional view showing a schematic configuration of the injection molding apparatus 10 according to the embodiment. FIG. 8B shows a cross section of the injection section 100, the mold clamping section 200, and the molding die 300. The injection section 100 includes a plasticizing section 110, an injection control mechanism 120, and a nozzle .

[0043] The plasticizing section 110 has a function of plasticizing at least a part of the molding material supplied from the hopper 101 to make it into a paste having flowability, and supplying the paste to the injection control mechanism 120 .

[0044] In this embodiment, the plasticizing section 110 includes a drive section 111 , a case 113 , a scroll compression section 115 , a barrel 116 , and a plasticizing heater 117 .

[0045] The drive unit 111 is configured by a motor and a reducer. The drive unit 111 is driven under the control of the control unit 500. The drive unit 111 is connected to the scroll compression unit 115.

[0046] In this embodiment, a scroll compressor 701 is used as the scroll compression section 115. The scroll compression unit 115 is housed in a space surrounded by the case 113 and the barrel 116. The scroll compression unit 115 housed inside the space is oscillated and rotated by the rotational driving force from the drive unit 111. FIG. 8B shows the central axis RX1 of the scroll compression section 115.

[0047] A communication hole 118 that penetrates the barrel 116 is provided in the center of the barrel 116. An injection cylinder 121 is connected to the communication hole 118. A check valve 124 is provided in the communication hole 118 at a portion upstream of the injection cylinder 121.

[0048] The plasticizing heater 117 is embedded in the barrel 116. The plasticizing heater 117 generates heat when supplied with power, and heats the molding material. The temperature of the plasticizing heater 117 is controlled by the control unit 500.

[0049] The molding material supplied to the scroll compression section 115 is plasticized between the scroll compression section 115 and the barrel 116 by the oscillating rotation of the scroll compression section 115 and the heat from the plasticizing heater 117, and flows along grooves and guide grooves (not shown) due to the oscillating rotation of the scroll compression section 115, and is led to the center of the scroll compression section 115. The molding material that has flowed into the center is led to the injection control mechanism 120 through a communication hole 118.

[0050] The injection control mechanism 120 includes an injection cylinder 121 , a plunger 122 , and a plunger driver 123 . The injection control mechanism 120 has the function of injecting the molding material supplied from the plasticizing section 110 into the injection cylinder 121 from the nozzle 130. The nozzle 130 is inserted into a through-hole provided in the fixed mold 310. The molding material injected from the nozzle 130 fills a cavity Cv defined between the fixed mold 310 and the movable mold 320.

[0051] Injection cylinder 121 is a substantially cylindrical member connected to communication hole 118 of barrel 116, and has plunger 122 inside. Plunger 122 slides inside injection cylinder 121 by plunger drive unit 123 configured by a motor, and pressure-feeds the molding material inside injection cylinder 121 to nozzle 130. Plunger drive unit 123 is driven under the control of control unit 500.

[0052] The mold clamping unit 200 has a function of moving the movable mold 320 relative to the fixed mold 310, that is, a function of opening and closing the casting mold 300. In this embodiment, the mold clamping unit 200 includes a fixed platen 210, a movable platen 220, tie bars 230, a ball screw unit 240, and a mold driving unit 250.

[0053] The injection unit 100, the fixed platen 210, and the movable platen 220 are arranged in this order along the X direction. The fixed platen 210 is fixed to the tip of a tie bar 230 that is provided along the X direction. A fixed mold 310 is fixed to the surface of the fixed platen 210 on the side facing the movable platen 220 by, for example, a bolt or a clamp.

[0054] The movable platen 220 is configured to be movable along tie bars 230. The movable platen 220 is connected to a ball screw unit 240 provided along the X direction. A movable mold 320 is fixed to the surface of the movable platen 220 on the side of the fixed platen 210 by, for example, a bolt or a clamp.

[0055] Mold driving unit 250 is composed of a motor and a reducer. Mold driving unit 250 is driven under the control of control unit 500. Mold driving unit 250 is connected to movable platen 220 via ball screw unit 240. Mold driving unit 250 rotates ball screw unit 240 to move movable platen 320, which is fixed to movable platen 220, relative to fixed platen 310, which is fixed to fixed platen 210, thereby opening and closing forming mold 300.

[0056] The molding die 300 is provided with an ejection mechanism 350 for releasing the molding material that has hardened inside the molding die 300 from the movable die 320 . The ejection mechanism 350 includes a first ejector pin 351 , a second ejector pin 352 , a support plate 353 , a support rod 354 , a spring 355 , a push plate 356 , and a thrust bearing 357 .

[0057] The first ejector pin 351 is a rod-shaped member for ejecting the molding material hardened inside the cavity Cv, i.e., the molded product, and releasing it from the mold. The first ejector pin 351 is provided so as to penetrate through the movable mold 320 and reach the cavity Cv. The second ejector pin 352 is a rod-shaped member for ejecting the molding material that has hardened inside the runner and releasing it from the mold. The second ejector pin 352 is provided so as to penetrate through the movable mold 320 and into the runner.

[0058] The support plate 353 is a plate member that supports the first ejector pin 351 and the second ejector pin 352. The first ejector pin 351 and the second ejector pin 352 are fixed to the support plate 353. The support rod 354 is fixed to the support plate 353 and inserted into a through hole provided in the movable mold 320. The spring 355 is disposed in the space between the movable mold 320 and the support plate 353 and inserted into the support rod 354. During molding, the spring 355 biases the support plate 353 so that the tip of the first ejector pin 351 forms part of the wall surface of the cavity Cv and the tip of the second ejector pin 352 forms part of the wall surface of the runner. The ejector plate 356 is fixed to the support plate 353. The thrust bearing 357 is attached to the ejector plate 356 and is provided to prevent the tip of the ball screw portion 240 from damaging the ejector plate 356.

[0059] As described above, the injection molding apparatus 10 according to this embodiment is provided with the scroll compressor 701 using the eccentric rocking device 1, and performs injection molding by sending out molten resin from the scroll compressor 701.

[0060] A third embodiment will be described. FIG. 9A is a diagram showing an example of the appearance of the a1 eccentric oscillation device a1 according to the embodiment when viewed from one direction. FIG. 9B is a diagram showing an example of the appearance of the a1 eccentric oscillation device a1 according to the embodiment when viewed from another direction. FIG. 10A is a diagram showing an example of a cross section of the a1 eccentric oscillation device a1 according to the embodiment. FIG. 10B is a diagram showing the meshing combinations of the gears of the a1 eccentric oscillating device a1 according to the embodiment. For convenience of explanation, each of FIGS. 9A, 9B, 10A, and 10B shows an XYZ Cartesian coordinate system, which is a three-dimensional Cartesian coordinate system.

[0061] The a1-th eccentric oscillation device a1 includes an a1-th input shaft Aa1, an a1-th planetary gear Ba1, an a2-th planetary gear Ba2, an a1-th hollow eccentric shaft Ca1, and an a1-th sun gear Da1. The a1-th input shaft Aa1 has the a1-th external gear GOa1 and the a2-th external gear GOa2. The a1-th planetary gear Ba1 has the a3-th external gear GOa3. The a2-th planetary gear Ba2 has an a4-th external gear GOa4. The a1 hollow eccentric shaft Ca1 has the a5 external gear GOa5, the a1 through hole Ea1, and the a1 eccentric portion Fa1 that is eccentric from the a1 rotation axis Pa1 of the a5 external gear GOa5. The a1-th sun gear Da1 has the a1-th internal gear GIa1.

[0062] The a1 external gear GOa1 and the a3 external gear GOa3 mesh with each other. The a3 external gear GOa3 and the a4 external gear GOa4 mesh with each other. The a4th external gear GOa4 and the a5th external gear GOa5 mesh with each other. The a2 external gear GOa2 and the a1 internal gear GIa1 mesh with each other. The a1-th input shaft Aa1 is inserted through the a1-th through-hole Ea1 of the a1-th hollow eccentric shaft Ca1. The a1-th sun gear Da1 is rotatably and slidably connected to the a1-th eccentric portion Fa1 of the a1-th hollow eccentric shaft Ca1. The a1-th sun gear Da1 and the a1-th eccentric portion Fa1 share the same rotation axis, which is the a1-th rotation axis Pa1. The a1-th rotation axis P1 is also the same as the axis of the a1-th input shaft Aa1.

[0063] Here, in the examples of FIGS. 9A and 9B, the internal gear and the external gear are not shown. Furthermore, the examples of Figures 10A and 10B show a combination of two planetary gears, such as the a1 planetary gear Ba1 and the a2 planetary gear Ba2, but it is also possible to have multiple combinations of such two planetary gears, for example. It is sufficient to provide one or more sets of such two planetary gears, and for example, by providing a plurality of sets of planetary gears, it is possible to stabilize the eccentric oscillation.

[0064] Here, a specific example of the meshing of the gears is the same as the example in FIG. A specific example of the a1 rotational sliding portion Ha1 between the a1 sun gear Da1 and the a1 eccentric portion Fa1 is the same as the example in FIG.

[0065] An example of the operation of the a1-th eccentric rocking device a1 will be shown with reference to FIGS. 11A to 11J. FIG. 11A is a diagram schematically illustrating an example of a state of the a1-th eccentric oscillation device a1 according to the embodiment when θa=0°. FIG. 11B is a diagram schematically illustrating an example of the state of the a1 eccentric oscillation device a1 according to the embodiment when θa=270°. FIG. 11C is a diagram schematically illustrating an example of the state of the a1-th eccentric oscillation device a1 according to the embodiment when θa=540°. FIG. 11D is a diagram schematically illustrating an example of the state of the a1 eccentric oscillation device a1 according to the embodiment at θa=810°. FIG. 11E is a diagram schematically illustrating an example of the state of the a1 eccentric oscillation device a1 according to the embodiment when θa=1080°.

[0066] FIG. 11F is a diagram schematically illustrating an example of the state of the a1-th eccentric oscillation device a1 according to the embodiment when θa=0°. FIG. 11G is a diagram schematically illustrating an example of the state of the a1-th eccentric oscillation device a1 according to the embodiment when θa=270°. FIG. 11H is a diagram schematically illustrating an example of the state of the a1 eccentric oscillation device a1 according to the embodiment when θa=540°. FIG. 11I is a diagram schematically illustrating an example of the state of the a1 eccentric oscillation device a1 according to the embodiment when θa=810°. FIG. 11J is a diagram schematically illustrating an example of the state of the a1-th eccentric oscillation device a1 according to the embodiment when θa=1080°.

[0067] 11A to 11J each show an XYZ Cartesian coordinate system similar to that shown in FIG. 9A for the sake of convenience of explanation. The orientation of the XYZ Cartesian coordinate system is an example for the purpose of explanation, and is not limited to this, and the eccentric oscillation device 1 may be installed in any orientation. In this example, Figures 11A to 11E and Figures 11F to 11J each show the same state at the a-th rotation angle θa, but for ease of explanation, the illustrated parts are different. That is, in this example, the overall operating state at the a-th rotation angle θa can be grasped by combining Figures 11A to 11E and Figures 11F to 11J. For this reason, the individual illustrated contents of Figures 11A to 11E and Figures 11F to 11J are not necessarily accurate and are merely schematic for explanation purposes. In this example, for convenience of explanation, an eccentric swing operation is performed, which is referred to as the a-th rotation angle θa.

[0068] In this example, the a-th rotation angle θa represents the rotation angle of the a1-th input shaft Aa1. 11A to 11J, a virtual a1-th reference frame Qa1 is shown to make it easier to understand the eccentric oscillation state of the a1-th eccentric oscillation device a1. The position of the a1-th reference frame Qa1 is fixed. In addition, in the examples of Figures 11A to 11J, in order to make it easier to understand the a1 rotation angle of each part, the following virtual reference positions are shown: the a1 reference position Ma1 of the a1 input shaft Aa1, the a2 reference position Ma2 of the a1 planetary gear Ba1, the a3 reference position Ma3 of the a2 planetary gear Ba2, the a4 reference position Ma4 of the a1 hollow eccentric shaft Ca1, and the a5 reference position Ma5 of the a1 sun gear Da1.

[0069] 11A and 11F also show the a1 rotation direction Ra1 of the a1 input shaft A1, the a2 rotation direction Ra2 of the a1 planetary gear Ba1, the a3 rotation direction Ra3 of the a2 planetary gear Ba2, and the a4 rotation direction Ra4 of the a1 hollow eccentric shaft Ca1. The a1 rotation direction Ra1 and the a3 rotation direction Ra3 are the same rotation direction, the a2 rotation direction Ra2 and the a4 rotation direction Ra4 are the same rotation direction, and the a2 rotation direction Ra2 and the a4 rotation direction Ra4 are opposite rotation directions to the a1 rotation direction Ra1 and the a3 rotation direction Ra3. The a1 sun gear Da1 does not rotate. In this example, the a1 rotation direction Ra1 of the a1 input shaft Aa1 will be referred to as the positive rotation direction, and the a2 rotation direction Ra2 of the a1 planetary gear Ba1 will be referred to as the negative rotation direction, but this is not limited to this and the positive and negative directions may be reversed.

[0070] The a1 eccentric rocking device a1 generally performs the first to sixth operations. The first action is an action in which forward rotational power is input to the a1 input shaft Aa1. The second action is an action in which the a1 sun gear Da1 rotates forward due to the first action. This rotation corresponds to spinning on its axis. However, due to the subsequent actions, the a1 sun gear Da1 does not actually rotate. The third action is an action in which the a1 planetary gear Ba1 rotates in the negative direction. The fourth action is an action in which the a2 planetary gear Ba2 rotates forward. The fifth action is an action in which the a1 hollow eccentric shaft Ca1 rotates in the negative direction. In the sixth operation, the a1 sun gear Da1 rotates eccentrically on the a1 hollow eccentric shaft Ca1 relative to the a1 input shaft Aa1. This rotation corresponds to an orbital revolution. In this example, the rotation and revolution of the a1 sun gear Da1 cancel each other out, so the a1 sun gear Da1 does not rotate.

[0071] As described above, in the a1 eccentric oscillating device a1 of this embodiment, the disk that is the a1 sun gear Da1 is made to revolve around a predetermined axis while rotating in the opposite direction, thereby enabling the disk to perform a pivoting motion without rotating. Therefore, in the a1 eccentric oscillation device a1 according to this embodiment, the a1 sun gear Da1 rotates in the positive direction while revolving in the negative direction at the same period, thereby eccentrically oscillating around the a1 input shaft Aa1.

[0072] Here, as for the configuration of the a1 eccentric oscillation device a1, a reducer using this configuration may be implemented in the same manner as in the example of FIG. In this case, the a1 eccentric oscillating device a1 has an output shaft with an internal gear (not shown), and the a1 sun gear Da1 further has an external gear (not shown), and when the external gear and the internal gear mesh together, power in a rotational direction opposite to the a1 rotational direction Ra1 of the a1 input shaft Aa1 is extracted from the output shaft.

[0073] Moreover, the configuration of the a1 eccentric oscillation device a1 may also be applied to a scroll compressor, similar to the examples of FIGS. 7A to 7D. Moreover, such a scroll compressor may be applied to an injection molding apparatus, similar to the example of FIGS. 8A and 8B.

[0074] Although the embodiments have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs within the scope of the gist of this disclosure.

[0075] [Note] Below, the dependent configuration examples may or may not apply. (Configuration example 1) an input shaft having a first external gear and a second external gear; a planetary gear having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric portion eccentric from a rotation axis of the first internal gear; a sun gear having a second internal gear; Equipped with the first external gear and the third external gear mesh with each other, the third external gear and the first internal gear mesh with each other, the second external gear and the second internal gear mesh with each other, the input shaft is inserted into the through hole of the hollow eccentric shaft, the sun gear is rotatably and slidably connected to the eccentric portion of the hollow eccentric shaft, The rotation axis of the sun gear and the rotation axis of the eccentric portion are the same. Eccentric rocking device.

[0076] (Configuration example 2) The planetary gears include a first planetary gear having a 3-1 external gear and a second planetary gear having a 3-2 external gear, As the meshing between the first external gear and the third external gear, the 3-1 external gear and the 3-2 external gear each mesh with the first external gear. The eccentric oscillation device according to (Configuration Example 1).

[0077] (Configuration example 3) At a rotational sliding portion between the sun gear and the eccentric portion, a bearing having a rotor is interposed between the sun gear and the eccentric portion. The eccentric oscillating device according to (Configuration Example 1) or (Configuration Example 2).

[0078] (Configuration example 4) An injection molding apparatus in which molten resin is discharged from a scroll compression mechanism including an eccentric rocking device, The eccentric rocking device is an input shaft having a first external gear and a second external gear; a planetary gear having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric portion eccentric from a rotation axis of the first internal gear; a sun gear having a second internal gear; Equipped with the first external gear and the third external gear mesh with each other, the third external gear and the first internal gear mesh with each other, the second external gear and the second internal gear mesh with each other, the input shaft is inserted into the through hole of the hollow eccentric shaft, the sun gear is rotatably and slidably connected to the eccentric portion of the hollow eccentric shaft, The rotation axis of the sun gear and the rotation axis of the eccentric portion are the same. Injection molding equipment.

[0079] (Configuration Example 5) an a1 input shaft having an a1 external gear and an a2 external gear; an a1 planetary gear having an a3 external gear; an a2 planetary gear having an a4 external gear; an a1 hollow eccentric shaft having an a5 external gear, an a1 through hole, and an a1 eccentric portion eccentric from the a1 rotation axis of the a5 external gear; an a1 sun gear having an a1 internal gear; Equipped with the a1 external gear and the a3 external gear mesh with each other, the a3 external gear and the a4 external gear mesh with each other, the a4 external gear and the a5 external gear mesh with each other, the a2 external gear and the a1 internal gear mesh with each other, the a1 input shaft is inserted into the a1 through hole of the a1 hollow eccentric shaft, the a1 sun gear is rotatably and slidably connected to the a1 eccentric portion of the a1 hollow eccentric shaft, The rotation axis of the a1 sun gear and the rotation axis of the a1 eccentric portion are the same. Eccentric rocking device. [Explanation of symbols]

[0080] 1...eccentric oscillation device, 1a...ath eccentric oscillation device, a1...a1th eccentric oscillation device, 10...injection molding apparatus, 20...base, 30...operation panel, 100...injection section, 101...hopper, 110...plasticization section, 111...drive section, 113...case, 115...scroll compression section, 116...barrel, 117...plasticization heater, 118...communicating hole, 120...injection control mechanism, 121...injection cylinder, 122...plunger, 123...plunger drive section, 124...check valve, 130...nozzle, 200...mold clamping section, 210...fixed platen, 220...movable platen, 230...tie bar, 240...ball screw unit, 250... mold drive unit, 300... forming mold, 310... fixed mold, 320... movable mold, 350... ejection mechanism, 351... first ejector pin, 352... second ejector pin, 353... support plate, 354... support rod, 355... spring, 356... push plate, 357... thrust bearing, 400... refrigerant supply unit, 500... control unit, 601... reducer, 701... scroll compressor, 711... fixed scroll, 712... orbiting scroll, 713... compression chamber, 721... first suction port, 722... second suction port, 731... discharge port, A1... input shaft, Aa1... a1th input shaft, B1... first planetary gear , B2...2nd planetary gear, B3...3rd planetary gear, B4...4th planetary gear, Ba1...a1th planetary gear, Ba2...a2th planetary gear, C1...hollow eccentric shaft, Ca1...a1th hollow eccentric shaft, Cv...cavity, D1...sun gear, D1a...a1th sun gear, Da1...a1th sun gear, E1...through hole, Ea1...a1th through hole, F1...eccentric portion, Fa1...a1th eccentric portion, GI1...1st internal gear, GI2...2nd internal gear, GI3...3rd internal gear, GIa1...a1th internal gear, GO1...1st external gear, GO2...2nd external gear, GO3-1...3-1st external gear, GO3-2...3-2nd external gear, GO3-3 ...3-3rd external gear, GO3-4...3-4th external gear, GO4...4th external gear, GOa1...a1th external gear, GOa2...a2th external gear, GOa3...a3th external gear, GOa4...a4th external gear, GOa5...a5th external gear, H1...rotating sliding part, Ha1...a1th rotating sliding part, J1...rotor, K1...bearing, M1...first reference position, M2...second reference position, M3...third reference position, M4...fourth reference position, Ma1...a1th reference position, Ma2...a2th reference position, Ma3...a3th reference position, Ma4...a4th reference position, Ma5...a5th reference position, P1...rotation axis, Pa1...a1th rotation axis,Q1...reference frame, a1st reference frame Qa1, R1...first rotation direction, R2...second rotation direction, R3...third rotation direction, R4...fourth rotation direction, Ra1...a1st rotation direction, Ra2...a2nd rotation direction, Ra3...a3rd rotation direction, Ra4...a4th rotation direction, RX1...center axis, V1...output shaft,

Claims

1. an input shaft having a first external gear and a second external gear; a planetary gear having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric portion eccentric from a rotation axis of the first internal gear; a sun gear having a second internal gear; Equipped with the first external gear and the third external gear mesh with each other, the third external gear and the first internal gear mesh with each other, the second external gear and the second internal gear mesh with each other, the input shaft is inserted into the through hole of the hollow eccentric shaft, the sun gear is rotatably and slidably connected to the eccentric portion of the hollow eccentric shaft, The rotation axis of the sun gear and the rotation axis of the eccentric portion are the same. Eccentric rocking device.

2. The planetary gears include a first planetary gear having a 3-1 external gear and a second planetary gear having a 3-2 external gear, As the meshing between the first external gear and the third external gear, the 3-1 external gear and the 3-2 external gear each mesh with the first external gear. The eccentric rocking device according to claim 1 .

3. At a rotational sliding portion between the sun gear and the eccentric portion, a bearing having a rotor is interposed between the sun gear and the eccentric portion. The eccentric rocking device according to claim 1 or 2.

4. An injection molding apparatus in which molten resin is discharged from a scroll compression mechanism including an eccentric rocking device, The eccentric rocking device is an input shaft having a first external gear and a second external gear; a planetary gear having a third external gear; a hollow eccentric shaft having a first internal gear, a through hole, and an eccentric portion eccentric from a rotation axis of the first internal gear; a sun gear having a second internal gear; Equipped with the first external gear and the third external gear mesh with each other, the third external gear and the first internal gear mesh with each other, the second external gear and the second internal gear mesh with each other, the input shaft is inserted into the through hole of the hollow eccentric shaft, the sun gear is rotatably and slidably connected to the eccentric portion of the hollow eccentric shaft, The rotation axis of the sun gear and the rotation axis of the eccentric portion are the same. Injection molding equipment.

5. an a1 input shaft having an a1 external gear and an a2 external gear; an a1 planetary gear having an a3 external gear; an a2 planetary gear having an a4 external gear; an a1 hollow eccentric shaft having an a5 external gear, an a1 through hole, and an a1 eccentric portion eccentric from the a1 rotation axis of the a5 external gear; an a1 sun gear having an a1 internal gear; Equipped with the a1 external gear and the a3 external gear mesh with each other, the a3 external gear and the a4 external gear mesh with each other, the a4 external gear and the a5 external gear mesh with each other, the a2 external gear and the a1 internal gear mesh with each other, the a1 input shaft is inserted into the a1 through hole of the a1 hollow eccentric shaft, the a1 sun gear is rotatably and slidably connected to the a1 eccentric portion of the a1 hollow eccentric shaft, The rotation axis of the a1 sun gear and the rotation axis of the a1 eccentric portion are the same. Eccentric rocking device.

Images