Drive device provided with oscillating linear drive mechanism

Abstract

The invention relates to a drive device with a swing linear drive mechanism. A drive device includes a housing, a first crankshaft, a second crankshaft, a first slider, a second slider, a first moving body, a first guide body, and a second guide body. At least one of the first guide body and the second guide body is configured separately from the housing, and is detachably fixed to the housing.

Description

Technical Field

[0001] An embodiment of the present invention relates to a drive device including a swing linear drive mechanism that converts rotation or swing motion of an eccentrically rotating rotating body into linear motion. Background Art

[0002] As a mechanism for converting rotary motion power into linear motion, a double eccentric circular arc swing mechanism is known. In the double eccentric circular arc swing mechanism, the eccentric mechanism of the double circle determines the radius at a specific ratio, so that the eccentric shaft on one side performs linear motion.

[0003] In such a swing mechanism, a crankshaft (eccentric shaft) supporting a reciprocating part as a moving body is supported by a cantilever structure. If the swing fulcrum is arranged just below the reciprocating part, the input and output shafts can be provided at one end of the eccentric shaft.

[0004] However, when the swing support portion is arranged directly below the reciprocating portion, when an external force acts on the reciprocating portion, the eccentric shaft in a cantilevered state may deform, thereby hindering the movement of the swing support portion.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6593945

[0008] Patent Document 2: Japanese Patent No. 6755542 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] An object of an embodiment of the present invention is to provide a drive device that can stably convert rotational motion into linear motion and has high operation efficiency.

[0011] Solutions for solving problems

[0012] According to the technical solution, the drive device comprises: a housing; a first crankshaft, which comprises a main shaft and an eccentric shaft, the main shaft having a first central axis, the eccentric shaft having a second central axis parallel to the first central axis and located at an eccentric position relative to the main shaft, and the two axial ends of the main shaft are supported on the housing in a manner that allows free rotation around the first central axis; a second crankshaft, which is supported on the eccentric shaft in a manner that allows free rotation around the second central axis, and the second crankshaft comprises a first axial neck portion eccentric to one direction relative to the second central axis and a second axial neck portion eccentric to another direction relative to the second central axis; a first sliding member, which is rotatably arranged on the housing A first axial neck portion; a second sliding member, which is rotatably disposed on the second axial neck portion; a first movable body, which is rotatably connected to the first axial neck portion and moves linearly in a first direction orthogonal to the first central axis as the first axial neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; a second guide body, which is disposed on the housing and guides the linear movement of the second sliding member in a second direction orthogonal to the first central axis and to the first direction; and a third guide body, which is disposed on the housing and guides the linear movement of the first movable body in the first direction.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to provide a driving device which can stably convert the power of a rotational motion into a linear motion and has a high operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view showing the appearance of the driving device according to the first embodiment.

[0016] Figure 2 It is a perspective view showing a driving mechanism of the driving device.

[0017] Figure 3 It is an exploded perspective view showing the driving mechanism.

[0018] Figure 4 It is a side view showing the driving mechanism.

[0019] Figure 5 is a cross-sectional view showing the driving device.

[0020] Figure 6 It is a side view showing a part of the housing cut away and viewed from one side of the driving device.

[0021] Figure 7 It is a side view showing a part of the housing cut away and viewed from another side of the driving device.

[0022] Figure 8 It is a side view showing a driving mechanism of the driving device according to the first modified example.

[0023] Fig. 9 It is a side view showing a driving mechanism of a driving device according to a second modified example.

[0024] Fig.10 It is a side view showing a driving mechanism of a driving device according to a third modified example.

[0025] Fig.11 It is a side view showing the driving mechanism of the driving device of the fourth modified example.

[0026] Fig.12 It is a perspective view showing a driving mechanism of a driving device according to a second embodiment.

[0027] Fig.13 It is a perspective view showing a driving mechanism of a driving device according to a third embodiment.

[0028] Fig.14 It is a perspective view showing a driving mechanism of a driving device according to a fourth embodiment.

[0029] Fig.15 It is a perspective view showing a driving mechanism of a driving device according to a fifth embodiment.

[0030] Fig.16 It is a perspective view showing a driving mechanism of a driving device according to a sixth embodiment.

[0031] Fig.17 It is a perspective view showing a driving mechanism of a driving device according to a sixth embodiment.

[0032] Fig.18 This is a side view showing a part of the housing 12 cut away and viewed from one side of the driving device in the sixth embodiment.

[0033] Fig.19 This is a side view showing a part of the housing 12 cut away and viewed from another side of the driving device in the sixth embodiment.

[0034] Fig. 20 It is a perspective view showing a driving mechanism of a first modified example of a guide plate including a slider.

[0035] Fig.21 It is a side view showing a first modified example of the guide plate.

[0036] Fig. 22 It is a side view showing a second modified example of the guide plate.

[0037] Fig.23It is a side view showing a driving mechanism according to a third modified example including a guide plate.

[0038] Fig.24A It is a perspective view showing a first modified example of the slider.

[0039] Fig. 24B It is a perspective view showing a second modified example of the slider.

[0040] Fig.25 It is a perspective view showing a modified example of the second crankshaft.

[0041] Fig.26 It is a perspective view showing a journal portion in a modified example of the second crankshaft.

[0042] Fig. 27 It is a side view showing a first modified example of the internal weight.

[0043] Fig.28 It is a perspective view showing a state where a first modified example of the inner weight is assembled to a journal portion.

[0044] Fig.29 It is a side view showing a second modified example of the internal weight.

[0045] Fig.30 It is a perspective view showing a state where a second modified example of the inner weight is assembled to a journal portion.

[0046] Fig.31 It is a diagram showing a state in which an eccentric shaft is inserted into a modified example of the second crankshaft, and is a front view seen from the radial direction.

[0047] Fig.32 It is a cross-sectional view along the axial direction of a journal portion in a modified example of the second crankshaft.

[0048] Fig.33 This is the main view of the eccentric shaft viewed from the radial direction.

[0049] Fig.34 The outer shape of the second crankshaft modification is overlapped with Fig.33 The main view is formed.

[0050] Fig.35A It is a perspective view showing a modified example of the second weight.

[0051] Fig.35B It is a perspective view showing a modified example of the first weight.

[0052] Fig.36 This is a cross-sectional view along the axial direction of a modified example in which an eccentric shaft and one counterweight are integrated.

[0053] Fig.37 It is a cross-sectional view of the crankshaft assembly along the axial direction.

[0054] Fig.38 It is a cross-sectional view along the axial direction showing a state in which a connecting rod and a slider are attached to a journal portion in a modification of the second crankshaft.

[0055] Fig.39 This is a side view showing a state in which one piston of the crankshaft assembly is inserted into the cylinder liner.

[0056] Fig.40 It means in Fig.39 A side view showing a state in which another piston is inserted into the cylinder liner after the state shown.

[0057] Fig.41A It is a perspective view showing a modified example of a cylinder liner.

[0058] Fig.41B It is a perspective view showing another modified example of the cylinder liner.

[0059] Fig.42A This is a perspective view showing a state in which the diameter of the coupling device of the motor drive shaft is reduced.

[0060] Fig.42B It is a perspective view showing a state in which the diameter of the coupling device of the motor drive shaft is expanded.

[0061] Fig.43 This is a cross-sectional view along the axial direction showing a state in which a motor drive shaft and a main shaft of a drive mechanism are connected.

[0062] Fig.44A This is a side view of a connecting rod of the drive mechanism viewed from the axial direction.

[0063] Fig.44B This is a side view of another connecting rod of the drive mechanism viewed from the axial direction.

[0064] Description of Reference Numerals

[0065] 10. Drive device; 12. Housing; C1. First center axis; C2. Second center axis; M1, M2. Main shaft; M3, Eccentric shaft; CR1, First crankshaft; JA1, First journal; JA2, Second journal; CR2, Second crankshaft; S1, First slide; GA1, GA2, A pair of guide surfaces; S2, Second slide; GB1, GB2, A pair of guide surfaces; P1, First piston (First moving body); CN1, Connecting rod ( 1st movable body); P2, 2nd piston (2nd movable body); CN2, connecting rod (2nd movable body); 30, 1st guide body; 30a, guide surface; 32, 2nd guide body; 32a, guide surface; 14a, 3rd guide body, 1st cylinder; 14b, 4th guide body, 2nd cylinder; P1, 1st piston; CN1, 1st connecting rod; 22, through hole; W1, 1st counterweight; IW1, 1st inner counterweight; W2, 2nd counterweight; IW2, 2nd inner counterweight. DETAILED DESCRIPTION

[0066] Below, while referring to the attached Figure 1 The embodiments of the present invention are described. In addition, the disclosed content is only an example of the present invention. For those skilled in the art, appropriate changes based on the main idea of ​​the invention that can be easily thought of are of course also included in the scope of the present invention. In addition, in order to make the description clearer, the drawings sometimes schematically show the width, thickness, shape, etc. of each part compared with the actual form, but this is only an example and does not limit the interpretation of the present invention. In addition, in this specification and each figure, sometimes, for the same elements as those described in the previous text about the figures that have appeared, the same figure marks are marked and the detailed description is appropriately omitted.

[0067] (First embodiment)

[0068] Figure 1 It is a perspective view schematically showing the appearance of the driving device according to the first embodiment. Figure 2 It is a perspective view showing a driving mechanism of the driving device.

[0069] In this embodiment, the drive device 10 is configured as a two-cylinder compressor or a generator, for example. Figure 1 As shown, the drive device 10 includes a housing (crankcase) 12, a first cylinder 14a, a second cylinder 14b, and a biaxial swing linear drive mechanism (hereinafter referred to as a drive mechanism) 20. The housing 12 is in a substantially rectangular box shape. The first cylinder 14a and the second cylinder 14b are mounted on the housing 12. The drive mechanism 20 is disposed in the housing 12, in the first cylinder 14a, and in the second cylinder 14b.

[0070] In one example, the housing 12 has a bottom wall 12a, a first side wall 12b, a second side wall 12c, a third side wall 12d, a fourth side wall 12e, a first top wall 13a, and a second top wall 13b. The bottom wall 12a is rectangular. The first side wall 12b and the second side wall 12c are erected along the two sides forming the bottom wall 12a. The first side wall 12b and the second side wall 12c are roughly pentagonal. The third side wall 12d and the fourth side wall 12e are erected along the two opposite sides forming the bottom wall 12a. The first top wall 13a and the second top wall 13b are connected to the upper edges of the first to fourth side walls. The first top wall 13a and the second top wall 13b are inclined relative to the bottom wall 12a and are opposite to each other at an angle of approximately 90 degrees.

[0071] The first cylinder 14a, which functions as the third guide body, is provided on the first top wall 13a. The first cylinder 14a extends in a direction (Y direction) orthogonal to the first top wall 13a. The second cylinder 14b, which functions as the fourth guide body, is provided on the second top wall 13b. The second cylinder 14b extends in a direction (Z direction) orthogonal to the second top wall 13b. The Y direction and the Z direction are directions orthogonal to each other, and the first cylinder 14a and the second cylinder 14b are arranged at an angle of approximately 90 degrees.

[0072] A first guide body 30 and a second guide body 32 are provided in the housing 12. The first guide body 30 and the second guide body 32 are fixed to the inner surface of the housing 12. As described later, the first guide body 30 and the second guide body 32 guide the linear motion of the slider of the drive mechanism 20.

[0073] The drive mechanism 20 has a first crankshaft (inner crankshaft) CR1, a second crankshaft (outer crankshaft) CR2, a first slide S1 and a second slide S2 mounted on the second crankshaft CR2, and a first piston P1 and a second piston P2 connected to the second crankshaft CR2. The first crankshaft CR1 has a pair of main shafts extending along the first central axis C1, respectively. These main shafts are supported by bearings B1 and B2 provided on the first side wall 12b and the second side wall 12c of the housing 12 so as to be rotatable. Thus, the first crankshaft CR1 is supported by the housing 12 in a double-supported manner in a state where the first central axis C1 is consistent with the X direction. In addition, the X direction is a direction orthogonal to the Y direction and the Z direction, and is a direction parallel to the bottom wall 12a of the housing 12.

[0074] The first piston P1 is arranged in the first cylinder 14a. The first piston P1 moves up and down linearly in the Y direction. The second piston P2 is arranged in the second cylinder 14b. The second piston P2 moves up and down linearly in the Z direction. The first slide S1 mounted on the second crankshaft CR2 is guided by the first guide body 30 and moves linearly in the Y direction. The second slide S1 mounted on the second crankshaft CR2 is guided by the second guide body 32 and moves linearly in the Z direction.

[0075] Next, the structure of the driving mechanism 20 will be described in detail.

[0076] Figure 2 It is a perspective view showing a driving mechanism. Figure 3 It is an exploded perspective view showing the drive mechanism.

[0077] like Figure 2 As shown, the drive mechanism 20 has a first crankshaft (inner crankshaft) CR1 and a second crankshaft (outer crankshaft) CR2. The second crankshaft CR2 is supported on the first crankshaft CR1 in a rotatable manner. The first crankshaft CR1 has: a pair of main shafts M1, M2, which have a first center axis C1; and an eccentric shaft M3, which has a second center axis C2. The pair of main shafts M1, M2 are separated from each other by a predetermined length in the axial direction. One main shaft M1 is connected to one end (first end) of the eccentric shaft M3 by means of a first counterweight W1. The other main shaft M2 is connected to the other end (second end) of the eccentric shaft M3 by means of a second counterweight W2. The second center axis C2 of the eccentric shaft M3 is parallel to the first center axis C1, and is located at a position separated (eccentric) from the first center axis C1 by a predetermined interval.

[0078] In this embodiment, the main shaft M2, the second weight W2, and the eccentric shaft M3 are integrally formed. The main shaft M1 and the first weight W1 are integrally formed. One end of the eccentric shaft M3 is detachably connected to the first weight W1.

[0079] The main shaft M1 is rotatably supported by a bearing (e.g., a ball bearing) B1 on the housing 12. The main shaft M2 is rotatably supported by a bearing (e.g., a ball bearing) B2 on the housing 12. At least one main shaft, such as the main shaft M2, protrudes from the housing 12 to the outside and constitutes an input / output shaft. The other main shaft M1 may also be set as an input / output shaft.

[0080] like Figure 3As shown, the second crankshaft CR2 has a cylindrical first neck portion JA1, a cylindrical second neck portion JA2, and a disc-shaped base BA. The base BA is located between the first neck portion JA1 and the second neck portion JA2. The base BA has a center axis CB1. The first neck portion JA1 is formed in a manner having a diameter smaller than the diameter of the base BA. Moreover, the first neck portion JA1 is located at an eccentric position relative to the center axis CB1 of the base BA. The second neck portion JA2 is formed in a manner having a diameter smaller than the diameter of the base BA. Moreover, the second neck portion JA2 is located at a position eccentric relative to the center axis CB1 of the base BA in a direction opposite to the first neck portion JA1. That is, the first neck portion JA1 has a center axis CG1. The center axis CG1 is parallel to the center axis CB1 of the base BA, and is separated from the center axis CB1 by a predetermined interval in the radial direction. The second neck portion JA2 has a center axis CG2. The center axis CG2 is parallel to the center axis CB1 of the base BA, and is separated from the center axis CB1 by a predetermined interval in a direction 180 degrees opposite to the center axis CG1.

[0081] The second crankshaft CR2 has a through hole 22 extending through the first journal portion JA1, the base portion BA, and the second journal portion JA2. The through hole 22 extends coaxially with the center axis CB1 of the base portion BA and opens at the end surfaces of the first journal portion JA1 and the second journal portion JA2.

[0082] The drive mechanism 20 further includes a first piston P1, a second piston P2, a first slider S1, a second slider S2, a first inner weight IW1, and a second inner weight IW2.

[0083] The first slider S1 and the first inner weight IW1 are mounted on the first journal portion JA1 of the second crankshaft CR2. The first piston P1 is connected to the first journal portion JA1 via the connecting rod CN1. The second slider S2 and the second inner weight IW2 are mounted on the second journal portion JA2 of the second crankshaft CR2. The second piston P2 is connected to the second journal portion JA2 via the connecting rod CN2.

[0084] In the present embodiment, the first piston P1 is a piston having a larger diameter than the second piston P2. The first piston P1 and the connecting rod CN1 constitute a first moving body. The second piston P2 and the connecting rod CN2 constitute a second moving body.

[0085] Figure 4 It is a side view showing the driving mechanism 20 . Figure 5 2 is a cross-sectional view showing a driving device including a driving mechanism 20. Figure 4As shown, the main axes M1 and M2 of the first crankshaft CR1 are rotatably supported about the first center axis C1 by the side walls 12b and 12c of the case 12 via bearings B1 and B2. The first center axis C1 extends substantially parallel to the bottom wall 12a of the case 12.

[0086] The eccentric shaft M3 of the first crankshaft CR1 passes through the through hole 22 of the second crankshaft CR2. The second crankshaft CR2 is supported by the eccentric shaft M3 in a manner that it can rotate freely around the center axis C2. In addition, since the first crankshaft CR1 rotates around the first center axis C1, the second crankshaft CR2 revolves around the first center axis C1. Moreover, when the second crankshaft CR2 rotates around the second center axis C2, the first journal portion JA1 revolves around the second center axis C2, and the second journal portion JA2 revolves around the second center axis C2. As a result, the first journal portion JA1 moves linearly in the Y direction, and the second journal portion JA2 moves linearly in the Z direction.

[0087] In this way, the first journal portion JA1 and the second journal portion JA2 each constitutes a swing fulcrum for converting a rotational motion into a linear motion.

[0088] One end (first end) of the connecting rod CN1 is connected to the first piston P1 in a rotatable manner by means of a piston pin. The other end (second end) of the connecting rod CN1 is connected to the outer peripheral surface of the first journal JA1 in a rotatable manner. Thus, the first piston P1 is connected to the second crankshaft CR2 by means of the connecting rod CN1. The first piston P1 and the connecting rod CN1 move linearly in the Y direction in conjunction with the linear motion of the first journal JA1. At this time, the first cylinder 14a functions as a guide body that guides the linear motion of the first piston P1 in the Y direction.

[0089] The first inner weight IW1 is connected to the outer peripheral surface of the first neck portion JA1 and extends radially outward from the first neck portion JA1. In one example, the first slider S1 is formed in an annular shape. The first slider is mounted on the outer peripheral surface of the first neck portion JA1 by means of a bearing. The first slider is mounted in a manner that it can rotate freely around the central axis CG1 of the first neck portion JA1.

[0090] In the present embodiment, in the first journal portion JA1, the connecting rod CN1, the first inner weight IW1, and the first slider S1 are arranged in this order from the base portion BA.

[0091] One end (first end) of the connecting rod CN2 is connected to the second piston P2 in a rotatable manner by means of a piston pin. The other end (second end) of the connecting rod CN2 is connected to the outer peripheral surface of the second journal portion JA2 of the second crankshaft CR2 in a rotatable manner. Thus, the second piston P2 is connected to the second crankshaft CR2 by means of the connecting rod CN2. The second piston P2 and the connecting rod CN2 move linearly in the Z direction in conjunction with the linear motion of the second journal portion JA2. At this time, the second cylinder 14b functions as a guide body that guides the linear motion of the second piston P2 in the Z direction.

[0092] The second inner weight IW2 is connected to the outer peripheral surface of the second neck portion JA2. The second inner weight IW2 extends from the second neck portion JA2 in a radial direction opposite to the first inner weight IW1. In one example, the second sliding member S2 is formed in an annular shape and is mounted on the outer peripheral surface of the second neck portion JA2 by means of a bearing. The second sliding member S2 is mounted in a manner that allows it to rotate freely around the central axis CG2 of the second neck portion JA2.

[0093] In the present embodiment, in the second journal portion JA2, the connecting rod CN2, the second inner weight IW2, and the second slider S2 are arranged in this order from the base portion BA.

[0094] Figure 6 It is a side view showing a part of the housing 12 cut away and viewed from one side of the driving device. Figure 7 It is a side view showing a part of the housing 12 cut away and viewed from another side of the driving device.

[0095] like Figure 6 and Figure 7 As shown, the first guide body 30 guides the linear motion of the first axial neck portion JA1 and the first slider S1 as a swing fulcrum. The first guide body 30 includes, for example, a pair of guide plates 30A and 30B. The guide plate 30A is erected substantially vertically on the bottom wall 12a and the side wall 12e of the housing 12. The guide plate 30A has a guide surface 30a formed by a side edge extending linearly in the Y direction.

[0096] The guide plate 30B is erected substantially vertically on the second top wall 13b and the third side wall 12d of the housing 12. The guide plate 30B has a guide surface 30b formed by a side edge extending linearly in the Y direction. The guide surface 30b is parallel to and faces the guide surface 30a at a distance substantially equal to the diameter of the first slider S1.

[0097] The guide plates 30A and 30B are provided at the same position as the first slider S1 in the X direction. The first slider S1 is sandwiched between the guide surface 30a and the guide surface 30b, and the outer peripheral surface of the first slider S1 contacts the guide surfaces 30a and 30b. Thus, the first slider S1 is guided in the Y direction by the guide surfaces 30a and 30b when performing linear motion in the Y direction.

[0098] like Figure 6 and Figure 7 As shown, the second guide body 32 guides the linear motion of the second axial neck portion JA2 and the second slide member S2 as a swing fulcrum. The second guide body 32 includes, for example, a pair of guide plates 32A and 32B. The guide plate 32A is erected substantially vertically on the bottom wall 12a and the side wall 12d of the housing 12. The guide plate 32A has a guide surface 32a formed by a side edge extending linearly in the Z direction.

[0099] The guide plate 32B is erected substantially vertically on the first top wall 13a and the fourth side wall 12e of the housing 12. The guide plate 32B has a guide surface 32b formed by a side edge extending linearly in the Z direction. The guide surface 32b is parallel to the guide surface 32a with a gap substantially equal to the diameter of the second slider S2.

[0100] The guide plates 32A and 32B are provided at the same position as the second slider S2 in the X direction. The second slider S2 is located between the guide surface 32a and the guide surface 32b, and the outer peripheral surface of the second slider S2 contacts the guide surfaces 32a and 32b. Thus, the second slider S2 is guided in the Z direction by the guide surfaces 32a and 32b when performing linear motion in the Z direction.

[0101] The operation of the driving device 10 configured as described above will be described.

[0102] For example, when the drive device 10 is used as a compressor, the rotational force is input to one main shaft M2, and the first crankshaft CR1 rotates around the first center axis C1. In conjunction with this, the second crankshaft CR2 revolves around the first center axis C1 and rotates around the second center axis C2. Furthermore, the first journal portion JA1 of the second crankshaft CR2 revolves around the second center axis C2, and the second journal portion JA2 revolves around the second center axis C2.

[0103] As a result, the first neck portion JA1 and the first slider S1 mounted on the first neck portion JA1, the first inner weight IW1, the connecting rod CN1, and the first piston P1 linearly move in the Y direction. The linear motion of the first neck portion JA1 and the first slider S1 is linearly guided by the first guide body 30. Furthermore, the linear motion of the first piston P1 is guided by the first cylinder 14a.

[0104] The first piston P1 moves up and down in the first cylinder 14a, thereby compressing and pressurizing the gas (air, refrigerant, etc.) in the first cylinder 14a and supplying it to the outside through a discharge port (not shown).

[0105] The second journal portion JA2 of the second crankshaft CR2, the second slider S2 mounted on the second journal portion JA2, the second inner weight IW2, the connecting rod CN2, and the second piston P2 move linearly in the Z direction. The linear motion of the second journal portion JA2 and the second slider S2 is linearly guided by the second guide body 32. Furthermore, the linear motion of the second piston P2 is guided by the second cylinder 14b.

[0106] The second piston P2 moves up and down in the second cylinder 14b, thereby compressing and pressurizing the gas (air, refrigerant, etc.) in the second cylinder 14b and supplying it to the outside through a discharge port (not shown).

[0107] As in the present embodiment, when the first piston P1 and the second piston P2 are set to different diameters, a so-called two-stage compression compressor can be realized. That is, the first stage compression action can be performed using the first piston P1 with a large diameter, and after the pressure is roughly pressurized to the desired pressure, the second stage compression action can be performed using the second piston P2 with a small diameter to adjust the pressurized state.

[0108] The driving device 10 of the first embodiment constructed as described above supports the first crankshaft CR1 of the double-axis swing linear driving mechanism 20 in a double-supported manner so as to be rotatable. As a result, the second crankshaft CR2 constituting the swing fulcrum can be stably supported to prevent the occurrence of adverse conditions at the swing fulcrum. At the same time, the two axial ends of the first crankshaft CR1 and any of the main shafts M1 and M2 can be set as input and output shafts. Moreover, the first axial neck portion JA1 and the second axial neck portion JA2 that serve as the swing fulcrum are guided by the guide bodies 30 and 32 provided in the housing 12, so that the swing fulcrum can perform stable and smooth linear motion. In addition, even if a reciprocating movable body (piston) is arranged directly below the swing fulcrum, the smooth linear motion of the swing fulcrum will not be hindered. Based on the above, a high-efficiency and low-vibration driving device can be obtained.

[0109] In addition, the drive device 10 is not limited to a compressor, and can also be applied to a generator, an engine, etc. In this case, a valve mechanism, a fuel supply device, an ignition device, and an exhaust mechanism are provided in the cylinder heads of the first cylinder 14a and the second cylinder 14b. In this structure, by supplying fuel to the first cylinder 14a and the second cylinder 14b and performing ignition, combustion, and exhaust, the first piston P1 and the second piston P2 can be driven in the Y direction and the Z direction respectively, and the first crankshaft CR1 can be driven to rotate.

[0110] Next, a modified example or a driving device of another embodiment is described. In the modified example and another embodiment described below, the same reference numerals are used for the same parts as those of the first embodiment, and the detailed description thereof is omitted or simplified, and the parts different from the first embodiment are described in detail.

[0111] (First Modification)

[0112] Figure 8 It is a side view showing a driving mechanism of the driving device according to the first modified example.

[0113] According to the first modification, the order of arrangement of the piston, the slider, and the counterweight in the X direction is different from that of the first embodiment described above. Figure 8 As shown, according to the first modification, in the first journal portion JA1, the connecting rod CN1, the first sliding member S1, and the first internal weight IW1 are arranged in the order from the base BA in the X direction. In the second journal portion JA2, the connecting rod CN2, the second sliding member S2, and the second internal weight IW2 are arranged in the order from the base BA in the X direction.

[0114] (Second Modification)

[0115] Fig. 9 It is a side view showing a driving mechanism of a driving device according to a second modified example.

[0116] like Fig. 9 As shown, according to the second modification, in the first neck portion JA1, the first slider S1, the first inner weight IW1, and the connecting rod CN1 are arranged in the order of the base BA in the X direction. In the second neck portion JA2, the second slider S2, the second inner weight IW2, and the connecting rod CN2 are arranged in the order of the base BA in the X direction.

[0117] (Third Modification)

[0118] Fig.10 It is a side view showing a driving mechanism of a driving device according to a third modified example.

[0119] like Fig.10 As shown, according to the third modification, in the first neck portion JA1, the first inner weight IW1, the first slide member S1, and the connecting rod CN1 are arranged in the order of the base BA in the X direction. In the second neck portion JA2, the second inner weight IW2, the second slide member S2, and the connecting rod CN2 are arranged in the order of the base BA in the X direction.

[0120] (Fourth Modification)

[0121] Fig.11 It is a side view showing the driving mechanism of the driving device of the fourth modified example.

[0122] like Fig.11 As shown, according to the fourth variant, in the first neck portion JA1, the first sliding member S1, the connecting rod CN1, and the first internal counterweight IW1 are arranged in the X direction from the base BA in the order. In the second neck portion JA2, the second sliding member S2, the connecting rod CN2, and the second internal counterweight IW2 are arranged in the X direction from the base BA. In the above-mentioned first to fourth variants, the other structures of the drive mechanism are the same as the drive mechanism of the aforementioned first embodiment. However, the setting positions of the first cylinder and the second cylinder are adjusted according to the arrangement positions of the first piston P1 and the second piston P2. In the first to fourth variants, the same effects as those of the first embodiment can also be obtained.

[0123] In the first embodiment, the driving device 10 is provided as a dual-cylinder device, but the present invention is not limited thereto and may be provided as a single-cylinder device or three or more cylinders.

[0124] (Second embodiment)

[0125] Fig.12 2 is a perspective view showing a driving mechanism of a driving device according to the second embodiment. Fig.12 As shown, according to the second embodiment, the drive mechanism 20 of the drive device 10 is a single cylinder, for example, having only the first piston P1. The first piston P1 is connected to the first journal JA1 (see FIG. 1 ) of the second crankshaft CR2 via the connecting rod CN1. Figure 5 ) is connected. A first slider S1 and a first inner weight IW1 are mounted on the first journal portion JA1. A second slider S2 and a second inner weight IW2 are mounted on the second journal portion JA2 of the second crankshaft CR2.

[0126] According to this embodiment, a structure is obtained in which the first axial neck portion JA1 and the second axial neck portion JA2, which serve as swing fulcrums, are guided by the guide body to perform linear motion. Therefore, even when the drive mechanism 20 is a single cylinder, the load acting on the piston is small, and a stable extremely low vibration operation can be achieved. At the same time, by setting it as a single cylinder, the miniaturization of the drive device 10 can be sought.

[0127] (Third embodiment)

[0128] Fig.13 2 is a perspective view showing a driving mechanism of a driving device according to a third embodiment. Fig.13 As shown, according to the third embodiment, the drive mechanism 20 of the drive device 10 is composed of three cylinders and further includes a third piston P3. The third piston P3 is connected to the first journal portion JA1 (see FIG. 1 ) of the second crankshaft CR2 via the connecting rod CN3. Figure 5) is connected. The base end of the connecting rod CN3 is shared with the base end of the connecting rod CN1, that is, formed integrally. With the linear motion of the first journal portion JA1, the first piston P1 and the third piston P3 move linearly in the Y direction integrally.

[0129] In one example, the third piston P3 has a smaller diameter than the first piston P1 and has the same diameter as the second piston P2.

[0130] (Fourth embodiment)

[0131] Fig.14 2 is a perspective view showing a driving mechanism of a driving device according to a fourth embodiment. Fig.14 As shown, according to the fourth embodiment, the driving mechanism 20 of the driving device 10 is 4 cylinders and further includes a fourth piston P4. The fourth piston P4 is connected to the second journal JA2 of the second crankshaft CR2 via a connecting rod CN4. The base end of the connecting rod CN4 is shared with the base end of the connecting rod CN2, that is, formed integrally. With the linear motion of the second journal JA2, the second piston P2 and the fourth piston P4 move linearly in the Z direction as a whole.

[0132] In one example, the fourth piston P4 has a diameter larger than that of the second piston P2 and the same as that of the first piston P1.

[0133] (Fifth embodiment)

[0134] Fig.15 : is a perspective view showing the driving mechanism of the driving device of the fifth embodiment. Fig.15 It is from Fig.14 The perspective view of the drive mechanism 20 is viewed from the opposite direction.

[0135] like Fig.15 As shown, according to the fifth embodiment, the driving mechanism 20 of the driving device 10 is constructed as four cylinders in the same manner as the fourth embodiment. In this embodiment, the third piston P3 uses a piston with a diameter larger than that of the second piston P2 and the same diameter as that of the first piston P1. The fourth piston P4 uses a piston with a diameter smaller than that of the first piston P1 and the same diameter as that of the second piston P2. That is, the first piston P1 and the third piston P3 of large diameter are connected to each other by means of integral connecting rods CN1 and CN3, and move linearly up and down in the Y direction. The second piston P2 and the fourth piston P4 of small diameter are connected to each other by means of integral connecting rods CN2 and CN4, and move linearly up and down in the Z direction.

[0136] In the third to fifth embodiments, the other structures of the drive mechanism 20 are the same as those of the drive mechanism 20 in the first embodiment. In addition, in the three-cylinder or four-cylinder drive devices shown in the third to fifth embodiments, the same effects as those of the drive device in the first embodiment can be obtained.

[0137] (Sixth Implementation Method)

[0138] Fig.16 It is a perspective view showing a driving mechanism of a driving device according to a sixth embodiment. Fig.17 It is a three-dimensional diagram of the drive mechanism viewed from different directions. Fig.18 This is a side view showing a part of the casing in a cutaway manner, viewed from one side of the driving device in the sixth embodiment. Fig.19 This is a side view showing a part of the casing in a cutaway manner, viewed from another side of the drive device in the sixth embodiment.

[0139] According to the sixth embodiment, sliders S1 and S2 of other shapes, here, rectangular shapes, are used instead of the annular sliders.

[0140] like Fig.17 and Fig.18 As shown, the first sliding member S1 is formed of a rectangular plate material, having a circular inner hole for fitting the first neck portion JA1 of the second crankshaft CR2, and four mutually orthogonal side surfaces. Two of the four side surfaces that are opposite to each other and extend linearly in the Y direction constitute a pair of guide surfaces GA1 and GA2 of the first sliding member S1. According to the present embodiment, the first sliding member S1 is formed in a manner that allows it to be divided into two parts at the position of a dividing surface D1 extending in the Y direction. The dividing surface D1 is a concave-convex surface with concave-convex arranged in the X direction. This prevents the two parts from deviating from each other in the X direction when the two parts are combined and the dividing surfaces are engaged with each other. The first sliding member S1 is mounted on the outer peripheral surface of the first neck portion JA1 by means of a bearing, and is located in a plane orthogonal to the central axis of the first neck portion JA1. As shown Fig.18 As shown, the first slider S1 is located between the guide plates 30A and 30B of the first guide body 30. The first slider S1 is sandwiched between the guide surface 30a and the guide surface 30b. For the first slider S1, the guide surfaces GA1 and GA2 of the first slider S1 are in contact with the guide surfaces 30a and 30b, respectively. Thus, when the first slider S1 performs a linear motion in the Y direction, it is guided in the Y direction by the guide surfaces 30a and 30b.

[0141] like Fig.16 and Fig.19As shown, the second sliding member S2 is formed by a rectangular plate. The second sliding member S2 has a circular inner hole for the second neck portion JA2 of the second crankshaft CR2 to fit in and four mutually orthogonal side surfaces. Two of the four side surfaces that are parallel to each other and extend linearly in the Z direction constitute a pair of guide surfaces GB1 and GB2 of the second sliding member S2. According to this embodiment, the second sliding member S2 is formed in a manner that can be divided into two accessories at the position of the dividing surface D2 extending in the Z direction. The dividing surface D2 is a concave-convex surface with concave and convex arranged in the X direction. Prevent the two accessories from deviating from each other in the X direction when the two accessories are combined and the dividing surfaces are engaged with each other. The second sliding member S2 is mounted on the outer peripheral surface of the second neck portion JA2 by means of a bearing, and is located in a plane orthogonal to the central axis of the second neck portion JA2.

[0142] like Fig.19 As shown, the second slider S2 is located between the guide plates 32A and 32B of the second guide body 32. The second slider S2 is sandwiched between the guide surface 32a and the guide surface 32b. For the second slider S2, the guide surfaces GB1 and GB2 of the second slider S2 are in contact with the guide surfaces 32a and 32b, respectively. Thus, the second slider S2 is guided in the Z direction by the guide surfaces 32a and 32b when performing a linear motion in the Z direction.

[0143] In the sixth embodiment, the other structures of the driving mechanism 20 are the same as those of the driving mechanism 20 in the first embodiment. In the sixth embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, by making the slider a separable structure, the assembly performance of the slider is improved.

[0144] In addition, the slider only needs to have two side surfaces (guide surfaces) that are parallel to each other and face each other, and is not limited to a rectangular shape, and may be other shapes.

[0145] (Modification of guide plate)

[0146] Reference Figure 6 , Figure 7 , describing a modification example of the guide plate.

[0147] The first guide body 30 guides the linear motion of the first slider S1 in the Y direction. The first guide body 30 includes guide plates 30A and 30B. The guide plate 30A is substantially vertically erected on the bottom wall 12a and the side wall 12e of the housing 12. The guide plate 30B is substantially vertically erected on the second top wall 13b and the third side wall 12d of the housing 12.

[0148] The second guide body 32 guides the linear motion of the second slider S2 in the Z direction. The second guide body 32 includes guide plates 32A and 32B. The guide plate 32A is substantially vertically erected on the bottom wall 12a and the side wall 12d of the housing 12. The guide plate 32B is substantially vertically erected on the first top wall 13a and the fourth side wall 12e of the housing 12.

[0149] The guide plates 30A, 30B and the guide plates 32A, 32B of the above-described embodiment are each formed integrally with the housing 12 .

[0150] For example, at least one of the guide plates 30A and 30B and the guide plates 32A and 32B may be formed of a member separate from the housing 12 , and the member may be detachably fixed to the housing 12 by fastening with bolts or the like.

[0151] Figure 20 to Figure 23 1 shows an example where the guide plates 30C and 32C are formed separately from the housing 12. Figure 20 to Figure 23 In the figure, when only one of the guide plates 30C and 32C is shown, the description is made with reference to the one guide plate shown in the figure, but the other guide plate also has the same structure.

[0152] Reference Fig. 20 , Fig.21 For example, the guide plates 30A and 30B are integrated into a guide member 30C having a circular outer peripheral shape when viewed from the axial direction of the rotation axis including the main shafts M1 and M2.

[0153] The guide member 30C has an oblong guide hole 30D that is long in one direction (Y direction, vertical direction in the figure) when viewed from the axial direction of the rotation axis. The inner periphery of the guide hole 30D has a pair of straight portions 30ta and 30tb that are opposite to each other in the width direction (Z direction, horizontal direction in the figure). The pair of straight portions 30ta and 30tb constitute the guide surfaces 30a and 30b. The first slider S1 moves linearly within the entire length of the pair of straight portions 30ta and 30tb.

[0154] The inner periphery of the guide hole 30D is formed with a pair of arc portions 30e1 and 30e2 that are opposite to each other in the length direction. The pair of arc portions 30e1 and 30e2 are located outside the range of the linear motion of the first slider S1. For example, the guide member 30C has four fastening portions 30f. The four fastening portions 30f are located on both sides of the arc portions 30e1 and 30e2 of the guide hole 30D in the width direction. Specifically, two fastening portions 30f of the four fastening portions 30f are located on both sides of the arc portion 30e1, and the remaining two fastening portions 30f are located on both sides of the arc portion 30e2. The four fastening portions 30f are used to fix the guide member 30C to the housing 12. The fastening portion 30f is fixed to the housing 12 in a detachable manner by fastening with bolts along the axial direction of the rotation axis. Specifically, the housing 12 has four fastening locations that correspond one-to-one to the four fastening portions 30f. The four fastening parts 30f are detachably fixed to the four fastening locations such that one fastening part 30f corresponds to one fastening location.

[0155] That is, the drive device 10 of this modified example comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first central axis C1, and the eccentric shaft M3 has a second central axis C2 parallel to the first central axis C1 and is located at a position eccentric to the main shafts M1, M2, and both ends of the main shafts M1, M2 in the axial direction are supported on the housing 12 in a manner that allows them to rotate freely around the first central axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second central axis C2, and the second crankshaft CR2 comprises a first shaft neck JA1 that is eccentric in one direction relative to the second central axis C2 and a second shaft neck JA2 that is eccentric in another direction relative to the second central axis C2. A journal portion JA2; a first sliding member S1, which is rotatably disposed on the first journal portion JA1; a second sliding member S2, which is rotatably disposed on the second journal portion JA2; a first movable body (a first piston P1, a connecting rod CN1), which is rotatably connected to the first journal portion JA1 and moves linearly in a first direction (Y direction) orthogonal to the first center axis C1 as the first journal portion JA1 moves; a first guide body 30, which is disposed in the housing 12 and guides the movement of the first sliding member S1 along the first direction; and a second guide body 32, which is disposed in the housing 12 and guides the movement of the second sliding member S2 along a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction.

[0156] Furthermore, at least one of the first guide body 30 and the second guide body 32 is configured separately from the housing 12 and is detachably fixed to the housing 12 by fastening with bolts.

[0157] The linear portions 30ta and 30tb of the first guide body 30 have almost no load input due to the movement of the first slider S1, but have load input due to the movement of the second slider S2, which causes friction and looseness. The second guide body 32 has the same problem.

[0158] In contrast, according to the above structure, the first guide body 30 that guides the movement of the first slide member S1 is formed separately from the housing 12. The first guide body 30 is fixed to the housing 12 in a detachable manner using bolts. Therefore, the first guide body 30 can be replaced when it is worn or damaged, and the movement of the first slide member S1 can be well maintained. Thus, a drive device that meets the following expectation can be provided: even if a complex mechanism such as the double-axis swing linear drive mechanism 20 is used, it is desired to maintain good operation for a long time.

[0159] Fig. 22 The guide member 30C' is shown. Fig.21 The guide member 30C shown in the figure is different, and has a structure in which the guide member 30C is divided into two parts in the width direction (Z direction, left-right direction in the figure). According to this structure, the single component is miniaturized, so the manufacture of the guide member 30C' becomes easy. In addition, the guide member 30C' can be assembled in a manner of clamping the first sliding member S1 using the divided body of the guide member 30C', which can improve the assembly freedom of the guide member 30C'.

[0160] The guide members 30C and 30C' are fixed to the housing 12 using bolts along the axial direction. Therefore, if the first slider S1 repeatedly inputs load to the guide surfaces 30a and 30b, the guide members 30C and 30C' may deviate along the fastening surface between the guide members 30C and 30C' and the housing 12, resulting in continuous vertical load on the bolts, causing damage.

[0161] In contrast, consider Fig.23 The guide members 32Da and 32Db shown in the figure are fixed to the housing 12 using bolts perpendicular to the axial direction (more specifically, bolts perpendicular to the guide surfaces 32a and 32b). Fig.23 For convenience, Fig.23 Although the guide members 32Da and 32Db for guiding the movement of the second slider S2 are shown, the guide member for guiding the first slider S1 also has the same structure.

[0162] In this case, the direction of the load applied to the guide surfaces 32a and 32b from the second slide member S2 is parallel to the axial direction of the bolt. Therefore, vertical loads are prevented from being applied to the bolts. The fastening surfaces between the guide members 32Da and 32Db and the housing 12 abut against each other in the axial direction of the bolts (the load input direction for inputting loads to the guide surfaces 32a and 32b), and bear the vertical loads applied to the guide surfaces 32a and 32b. In this regard, the vertical loads can also be prevented from being input to the bolts, thereby suppressing the damage of the bolts.

[0163] The fastening parts 32d1 and 32d2 of the guide members 32Da and 32Db have bolt through holes. The bolt through holes are opened in the guide surfaces 32a and 32b or their extended parts. Countersunk holes are formed in the parts of the guide surfaces 32a and 32b where the bolt through holes are provided, so that the heads of the bolts can be sunken. Thus, interference between the second slide member S2 and the bolts is prevented. There is no displacement in the X direction between the guide surfaces 32a and 32b and the bolts, and even if a load is input from the second slide member S2 to the guide surfaces 32a and 32b, the guide members 32Da and 32Db will not fall in the X direction.

[0164] (Modification of Slider)

[0165] like Fig.24A As shown, the first sliding member S1 of the sixth embodiment is formed of a rectangular plate. Fig.24A Although not shown, the second slider S2 also has the same structure.

[0166] The first sliding member S1 has four side surfaces arranged in a mutually orthogonal manner. Two side surfaces extending in the Y direction among the four side surfaces constitute a pair of guide surfaces GA1 and GA2 of the first sliding member S1. A sliding member oil hole h1 is formed in the central portion of the guide surfaces GA1 and GA2 extending in the Y direction. The sliding member oil hole h1 penetrates the first sliding member S1 in a manner extending in the radial direction. The sliding member oil hole h1 extends in a manner reaching the inner hole for the first axial neck portion JA1 to fit. Lubricating oil can be supplied from the area where the first axial neck portion JA1 is arranged toward the guide surfaces GA1 and GA2 through the sliding member oil hole h1. In the first sliding member S1, the total length in the Y direction and the Z direction is approximately 100 mm, and the thickness in the X direction (axial direction) is approximately 30 mm. So far, it is set to be the same structure as the first sliding member S1 of the sixth embodiment described above.

[0167] The first slider S1 of the modified example has a curvature (radius of about 800 mm) convex toward the outer peripheral side when viewed from the axial direction on the guide surfaces GA1 and GA2 extending in the Y direction. In other words, the first slider S1 includes an arc-shaped portion r1 having a curvature convex toward the outer side in the width direction on the guide surfaces GA1 and GA2 located on both sides in the width direction orthogonal to the moving direction of the first slider S1.

[0168] That is, the drive device 10 of this modified example comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first center axis C1, the eccentric shaft M3 has a second center axis C2 parallel to the first center axis C1 and is located at an eccentric position relative to the main shafts M1, M2, and both axial ends of the main shafts M1, M2 are supported on the housing 12 in a manner that allows them to rotate freely around the first center axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second center axis C2, and the second crankshaft CR2 comprises a first journal portion JA1 that is eccentric in one direction relative to the second center axis C2 and a second journal that is eccentric in another direction relative to the second center axis C2 Part JA2; a first sliding member S1, which is rotatably arranged on the first shaft neck portion JA1; a second sliding member S2, which is rotatably arranged on the second shaft neck portion JA2; a first movable body (first piston P1, connecting rod CN1), which is rotatably connected to the first shaft neck portion JA1 and moves linearly in a first direction (Y direction) orthogonal to the first center axis C1 as the first shaft neck portion JA1 moves; a first guide body 30, which is arranged in the housing 12, and guides the movement of the first sliding member S1 along the first direction; and a second guide body 32, which is arranged in the housing 12, and guides the movement of the second sliding member S2 along a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction.

[0169] Furthermore, at least one of the first sliding member S1 and the second sliding member S2 is in a plate shape with the axial direction as the thickness direction, and has a pair of side surfaces (guide surfaces GA1, GA2) extending along the moving direction on both sides in the width direction orthogonal to the moving direction thereof as viewed from the axial direction, and each side surface includes an arc-shaped portion r1 having a curvature convex outward in the width direction. In addition, the arc-shaped portion r1 is different from the rounded corner of the corner of the first sliding member S1, and is a portion having a sufficiently small curvature.

[0170] According to this structure, the contact area between the guide surfaces GA1 and GA2 of the first slider S1 and the guide surfaces 30a and 30b of the first guide body 30 is reduced compared to the case where the guide surfaces GA1 and GA2 extend linearly when viewed from the axial direction. Therefore, it is possible to prevent the operation of the drive mechanism 20 from being malfunctioning due to the contact resistance between the first slider S1 and the first guide body 30. Thus, it is possible to provide a drive device that satisfies the following expectation: even if a complex mechanism such as the dual-axis swing linear drive mechanism 20 is used, it is desired to maintain good operation for a long time.

[0171] Fig. 24BAnother modification of the first sliding member S1 is shown. In this modification, the guide surfaces GA1 and GA2 of the first sliding member S1 form an arc-shaped portion r1 having a curvature (radius of 800 mm) convex toward the outer peripheral side when viewed from the axial direction, and a straight portion (flat portion) r2 along the Y direction is formed in the middle range including the center portion of the arc-shaped portion r1 in the Y direction.

[0172] According to this structure, an arc-shaped portion r1 is formed in the range on both sides of the guide surfaces GA1 and GA2 in the Y direction. As a result, the effect of reducing the contact area between the guide surfaces GA1 and GA2 of the first slider S1 and the guide surfaces 30a and 30b of the first guide body 30 can be obtained. On the other hand, a flat straight portion r2 is formed in the middle range of the guide surfaces GA1 and GA2 in the Y direction. As a result, it is easy to maintain the oil film between the guide surfaces GA1 and GA2 of the first slider S1 and the guide surfaces 30a and 30b of the first guide body 30, so that the movement of the first slider S1 is smoother. The oil hole h1 opens in the middle range of the guide surfaces GA1 and GA2 in the Y direction. Therefore, it is easy to receive the supply of lubricating oil, and in this regard, the movement of the first slider S1 can also be smooth.

[0173] For example, a gap is generated between the guide surfaces GA1 and GA2 of the first slider S1 and the guide surfaces 30a and 30b of the first guide body 30. The minimum value of the gap is larger than the maximum tolerance of the eccentricity (the distance between the center axes C2 and CG1) of the first journal portion JA1 of the second crankshaft CR2. With this structure, it is also possible to prevent malfunction of the drive mechanism 20 caused by the contact resistance between the first slider S1 and the first guide body 30.

[0174] (Deformation example of journal)

[0175] Fig.25 , Fig.26 FIG. 2 shows a modified example of the first journal portion JA1 and the second journal portion JA2 (a modified example of the second crankshaft CR2). Fig.26 The second journal portion JA2 also has the same structure as the first journal portion JA1 shown.

[0176] The first journal portion JA1 and the second journal portion JA2 are configured as separate cylindrical members.

[0177] In the above-described embodiment, a disc-shaped base portion BA (see FIG. 1 ) is provided between the first journal portion JA1 and the second journal portion JA2 in the axial direction. Figure 3), but in this modification, there is no base BA. The first journal portion JA1 has an inner end surface t1 on the inner side in the axial direction of the second crankshaft CR2. The second journal portion JA2 has an inner end surface t2 on the inner side in the axial direction of the second crankshaft CR2. In this modification, the inner end surfaces t1 and t2 are connected to each other in abutment.

[0178] Next, refer to Figure 31 to Figure 34 The eccentric shaft M3 in the shape of a rod is inserted into the through hole 22 that passes through the first neck portion JA1 and the second neck portion JA2. The center axes (center axes CG1, CG2) of the first neck portion JA1 and the second neck portion JA2 are offset to opposite sides by the same amount relative to the center axis (second center axis C2) of the eccentric shaft M3 in the eccentric direction orthogonal to the second center axis C2. Hereinafter, the direction orthogonal to the axial direction and the eccentric direction is referred to as the eccentric orthogonal direction. For example, Fig.25 , Fig.26 As shown, a pair of lightening holes 22a are provided in the area on the side opposite to the through hole 22 in the eccentric direction of the first and second neck portions JA1 and JA2. The pair of lightening holes 22a each have a fan-shaped shape in the axial direction. The pair of lightening holes 22a are formed in a manner of sandwiching the central portion in the eccentric orthogonal direction.

[0179] The first neck portion JA1 and the second neck portion JA2 are each provided with a connecting portion 23. The connecting portion 23 is provided on both sides of the through hole 22 of each of the first neck portion JA1 and the second neck portion JA2 in the eccentric orthogonal direction. The connecting portion 23 connects the first neck portion JA1 and the second neck portion JA2 to each other. In each of the first neck portion JA1 and the second neck portion JA2, the connecting portion 23 located on one side in the eccentric orthogonal direction forms a bolt through hole along the axial direction, and the connecting portion 23 located on the other side in the eccentric orthogonal direction forms a threaded hole along the axial direction.

[0180] In the bolt through hole and the threaded hole of the connection portion 23, counterbores of the same diameter are formed on the inner end face t1 of the first neck portion JA1 and the inner end face t2 of the second neck portion JA2. A cylindrical collar 26 is inserted into the counterbores that are opposite to each other in the axial direction. A positioning hole for inserting a positioning pin 27 is formed adjacent to the bolt through hole and the threaded hole. A working hole for processing each hole is formed on the opposite side of the first neck portion JA1 and the second neck portion JA2 in the axial direction to the bolt through hole and the threaded hole. The connection bolt can be inserted into the bolt through hole through the working hole.

[0181] When connecting the first and second neck portions JA1 and JA2, first, the collar 26 and the positioning pin 27 are inserted into one of the inner end faces t1 and t2, so that the inner end faces t1 and t2 are opposite to each other and abut against each other. Thus, the collar 26 and the positioning pin 27 are inserted into the countersunk hole and the positioning hole opposite to each other in the axial direction, and the first and second neck portions JA1 and JA2 are relatively positioned. In this state, the connecting bolt is passed through the bolt through hole of one of the first and second neck portions JA1 and JA2, and the connecting bolt is screwed into and fastened to the threaded hole of the other. Thus, the first and second neck portions JA1 and JA2 are integrally connected in the axial direction.

[0182] A pair of weight connection parts 28 are formed in the middle part of the first and second journal parts JA1 and JA2 in the axial direction so as to sandwich the central part in the orthogonal direction of the eccentricity. The weight connection part 28 has a structure for mounting the separate internal weights IW1 and IW2. The weight connection part 28 includes a bolt through hole parallel to the eccentric direction and a concave shape formed by missing the outer peripheral surface of the journal part on both sides of the bolt through hole.

[0183] That is, the drive device 10 of this modified example comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first center axis C1, the eccentric shaft M3 has a second center axis C2 parallel to the first center axis C1 and is located at an eccentric position relative to the main shafts M1, M2, and both axial ends of the main shafts M1, M2 are supported on the housing 12 in a manner that allows them to rotate freely around the first center axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second center axis C2, and the second crankshaft CR2 comprises a first journal portion JA1 that is eccentric in one direction relative to the second center axis C2 and a second journal that is eccentric in another direction relative to the second center axis C2 Part JA2; a first sliding member S1, which is rotatably arranged on the first shaft neck portion JA1; a second sliding member S2, which is rotatably arranged on the second shaft neck portion JA2; a first movable body (first piston P1, connecting rod CN1), which is rotatably connected to the first shaft neck portion JA1 and moves linearly in a first direction (Y direction) orthogonal to the first center axis C1 as the first shaft neck portion JA1 moves; a first guide body 30, which is arranged in the housing 12, and guides the movement of the first sliding member S1 along the first direction; and a second guide body 32, which is arranged in the housing 12, and guides the movement of the second sliding member S2 along a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction.

[0184] Furthermore, the first journal portion JA1 and the second journal portion JA2 are configured as separate bodies, and are integrally connected in the axial direction to configure the second crankshaft CR2.

[0185] According to this structure, the first axial neck portion JA1 and the second axial neck portion JA2, which are separate from each other, are connected in the axial direction to form the second crankshaft CR2. As a result, the manufacturing and processing of the first axial neck portion JA1 and the second axial neck portion JA2 become easy. The connection between the first axial neck portion JA1 and the second axial neck portion JA2 is performed by fastening with bolts along the axial direction in a state where the relative positions are determined by the axial collar 26 and the positioning pin 27. Therefore, the assembly of the second crankshaft CR2 becomes easy. As a result, it is possible to provide a drive device that meets the following expectations: even if a complex mechanism such as a dual-axis swing linear drive mechanism 20 is used, it is desired to make the manufacturing and assembly easy.

[0186] Reference Fig.37 The second crankshaft CR2 has a through hole 22 that passes through the first journal portion JA1 and the second journal portion JA2 in the axial direction. An independent eccentric shaft M3, for example, in the form of a rod, passes through the through hole 22. Both ends of the eccentric shaft M3 in the axial direction constitute a protruding shaft mt that protrudes axially outward from the first journal portion JA1 and the second journal portion JA2. The first counterweight W1 and the second counterweight W2 are respectively mounted on each protruding shaft mt. That is, in this modified example, the first counterweight W1 and the second counterweight W2 are separately constituted from the eccentric shaft M3.

[0187] Refer to Fig.35A , Fig.35B The first counterweight W1 and the second counterweight W2 are each integrated with the main shaft M1 or M2 located on the same side in the axial direction. The first counterweight W1 and the second counterweight W2 are integrally connected to the protruding shaft mt located on the same side in the axial direction by means of a stop pin along the axial direction and a fixing bolt along the radial direction. Thus, a drive device that meets the following expectations can be provided: even if a complex mechanism such as a dual-axis swing linear drive mechanism 20 is used, it is desired to make manufacturing and assembly easy.

[0188] In the above-mentioned modification, both the first counterweight W1 and the second counterweight W2 are formed separately from the eccentric shaft M3. Fig.36 As shown, one of the first weight W1 and the second weight W2 (the second weight W2 in the figure) may be integrally formed with the eccentric shaft M3 (integrally formed from the same material).

[0189] Reference Fig.31 , Fig.33The eccentric shaft M3 is explained below. The outer peripheral portion of the eccentric shaft M3 is formed with a shaft outer peripheral surface ma, oil grooves mb, md, and a displacement portion mc. The shaft outer peripheral surface ma contacts the inner peripheral surfaces of the through holes 22 of the first journal portion JA1 and the second journal portion JA2. The oil grooves mb, md are recessed toward the inner peripheral side relative to the shaft outer peripheral surface ma and are formed into an annular shape. The displacement portion mc is recessed relative to the shaft outer peripheral surface ma in a manner that is shallower than the oil grooves mb, md and is flat in a wider range in the axial direction. The protruding shafts mt located on both sides of each journal portion in the axial direction have a diameter smaller than the diameter of the shaft outer peripheral surface ma.

[0190] Annular corners k1 are formed between the shaft outer peripheral surface ma and the protruding shaft mt, between the shaft outer peripheral surface ma and the oil grooves mb, md, and between the shaft outer peripheral surface ma and the displacement portion mc. Each corner k1 is chamfered in a tapered manner with respect to the axial direction and the radial direction.

[0191] If the through hole 22 is offset at the inner end faces t1 and t2 facing each other, the corners k1 of the outer peripheral portion of the eccentric shaft M3 are easily caught on the opening periphery of the through hole 22, making it difficult to assemble the second crankshaft CR2.

[0192] In this modified example, each corner k1 of the eccentric shaft M3 is chamfered so that each corner k1 of the eccentric shaft M3 is not easily caught on the opening periphery of the through hole 22. The size of the chamfer is set to, for example, twice the tolerance of the center position of each through hole 22 of the first neck portion JA1 and the second neck portion JA2. Thus, even if the deviation of the axial center position of each through hole 22 is the largest, each corner k1 of the eccentric shaft M3 is not easily caught.

[0193] The peripheral edge portions k2 of the through holes 22 of the first and second journal portions JA1 and JA2, which are opened toward the axial outer side of the second crankshaft CR2, are also chamfered in a tapered manner with respect to the axial direction and the radial direction, similarly to the corner portions k1. The peripheral edge portions k3 of the through holes 22 of the first and second journal portions JA1 and JA2, which are opened toward the axial inner side of the second crankshaft CR2 and face each other, may also be chamfered in the same manner.

[0194] (Modification of internal weight)

[0195] like Fig. 27 , Fig.28 As shown, the first inner counterweight IW1 of the modified example is composed of a member that is separate from the first neck portion JA1. Although not shown, the second inner counterweight IW2 of the modified example is also composed of a member that is separate from the second neck portion JA2. In the following, the first neck portion JA1 and the first inner counterweight IW1 are used as an example for explanation, but the second neck portion JA2 and the second inner counterweight IW2 also have the same structure.

[0196] Here, the case where the first and second journal portions JA1 and JA2 are cylindrical components will be described. In this case, the first and second inner counterweights IW1 and IW2 need to be installed on the corresponding journal portion JA1 or JA2 by bolting, etc., on the basis of being separately provided on the corresponding journal portion JA1 or JA2. In this case, for example, the following structure is considered: an annular body is integrally formed on the split counterweight to cover the entire circumference of the outer peripheral surface of the journal portion, and the annular body is engaged with the outer peripheral surface of the journal portion, and the split counterweight is installed on the journal portion. However, the annular body does not function as a counterweight, which hinders the compactness and lightness of the split counterweight.

[0197] Fig. 27 , Fig.28 The internal counterweight IW1 shown does not have an annular body but is only a fan-shaped eccentric weight (weight body) W3 that protrudes outward from the outer circumference of the neck portion JA1, so as to achieve a compact and lightweight split internal counterweight IW1. The eccentric weight W3 is fixed to the neck portion JA1 by using a pair of connecting bolts BC corresponding to the aforementioned pair of weight connecting portions 28. The internal counterweight IW1 has an arc-shaped arc portion W4 along the outer circumference of the neck portion JA1. The arc portion W4 does not extend over the entire circumference of the outer circumference of the neck portion JA1, but only contacts the range where the eccentric weight W3 is provided in the circumferential direction, and the remaining range in the circumferential direction has an open portion that is disconnected in the circumferential direction. The internal counterweight IW1 does not form an annular body extending over the entire circumference of the neck portion JA1, but at least a part of the circumferential portion is missing as an open portion, forming a non-contact range relative to the neck portion JA1.

[0198] That is, the drive device 10 of this modified example comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first center axis C1, the eccentric shaft M3 has a second center axis C2 parallel to the first center axis C1 and is located at an eccentric position relative to the main shafts M1, M2, and both axial ends of the main shafts M1, M2 are supported on the housing 12 in a manner that allows them to rotate freely around the first center axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second center axis C2, and the second crankshaft CR2 comprises a first journal portion JA1 that is eccentric in one direction relative to the second center axis C2 and a second journal that is eccentric in another direction relative to the second center axis C2 Part JA2; a first sliding member S1, which is rotatably arranged on the first shaft neck portion JA1; a second sliding member S2, which is rotatably arranged on the second shaft neck portion JA2; a first movable body (first piston P1, connecting rod CN1), which is rotatably connected to the first shaft neck portion JA1 and moves linearly in a first direction (Y direction) orthogonal to the first center axis C1 as the first shaft neck portion JA1 moves; a first guide body 30, which is arranged in the housing 12, and guides the movement of the first sliding member S1 along the first direction; and a second guide body 32, which is arranged in the housing 12, and guides the movement of the second sliding member S2 along a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction.

[0199] Furthermore, separate internal counterweights IW1, IW2 are installed in a detachable manner on at least one of the first axial neck portion JA1 and the second axial neck portion JA2, and the internal counterweights IW1, IW2 have an arc portion W4, and the arc portion W4 is a range in which an eccentric weight W3 is set along the outer peripheral surface in the circumferential direction of the axial neck portion on which the internal counterweights IW1, IW2 are installed, and the range in which the eccentric weight W3 is not set serves as an open portion disconnected in the circumferential direction.

[0200] According to this structure, the internal counterweights IW1 and IW2 of the journal part are only in partial contact with the outer peripheral surface of the journal neck. In addition, the remaining range in the circumferential direction is set as an open portion and is non-contact. Therefore, compared with the case where the internal counterweights IW1 and IW2 of the split body have an annular body that fits the entire circumference of the journal neck, the internal counterweights IW1 and IW2 of the split body can be made smaller and lighter. Thus, a drive device that meets the following expectations can be provided: even if a complex mechanism such as a dual-axis swing linear drive mechanism 20 is used, it is desired to make it easy to manufacture and assemble.

[0201] exist Fig. 27 , Fig.28In the example, the arc portion W4 of the inner counterweight IW1 is a surface along the outer peripheral surface of the neck JA1 (a surface along the circumferential direction). When the drive device 10 is accelerated or decelerated during operation, the inner counterweight IW1 may deviate along the outer peripheral surface of the neck JA1, causing the inner counterweight IW1 to loosen and the contact surface to wear.

[0202] Therefore, in Fig.29 , Fig.30 In the example shown, the following structure is used: a leg portion 29 is extended from the arc portion W4 of the inner counterweight IW1 toward the journal JA1 side along each connecting bolt BC, and the leg portion 29 is inserted into a recess of a weight connecting portion 28 formed on the outer periphery of the journal JA1. A surface W5 intersecting the circumferential direction of the journal JA1 is formed in at least one of the inner counterweight IW1 and the journal JA1. If the counterweight IW1 is fixed by tightening each connecting bolt BC, the surface W5 will not contact any part, and the deviation of the counterweights IW1 and IW2 in the circumferential direction can be suppressed by the structure of the weight connecting portion 28.

[0203] Therefore, even when the driving device 10 is accelerating or decelerating, the counterweight IW1 can be prevented from deviating from the outer peripheral surface of the shaft neck JA1, thereby suppressing the loosening and wear of the counterweight IW1. Thus, a driving device that meets the following expectation can be provided: even if a complex mechanism such as a dual-axis swing linear driving mechanism 20 is used, it is desired to maintain good operation for a long time.

[0204] (Oil supply structure of the second crankshaft)

[0205] like Fig.37 As shown in FIG. 1 , the eccentric shaft M3 of the first crankshaft CR1 is formed in a hollow shape and has an internal space extending along the axis. The internal space of the eccentric shaft M3 functions as an in-shaft oil passage 34 for supplying lubricating oil to each movable part of the second crankshaft CR2. The eccentric shaft M3 is formed with a plurality of oil holes 41 to 44 extending radially outward from the in-shaft oil passage 34. Oil is supplied to each movable part such as the journal portion through these plurality of oil holes 41 to 44.

[0206] The drive device 10 includes an oil pan located at the lower portion of the housing 12. The drive device 10 supplies oil stored in the oil pan to each portion of the drive device 10 to lubricate the movable portion. Fig.37 The main shaft M2 located on the left side of the drive device 10 and the drive shaft 51 of the electric motor 50 serving as the drive source (see Fig.43) is connected. An eccentric shaft 36 eccentric to the main shaft M2 is provided at the base end portion of the main shaft M2 (the end portion located on the counterweight IW2 side). The eccentric shaft 36 generates a driving force for an oil pump (not shown). The oil ejected by the oil pump reaches the oil path formed in the eccentric shaft 36 and is supplied to one end side of the shaft inner oil path 34 through an inlet oil hole 37 inclined relative to the center axis C2. The oil flowing through the shaft inner oil path 34 and reaching the other end side is supplied from the oil inlet hole 37 in the shaft inner oil path 34. Fig.37 The oil outlet hole 38 formed by the counterweight W1 on the right side returns to the housing 12.

[0207] Refer to Fig.33 In addition to the shaft outer peripheral surface ma, the outer oil groove mb, the displacement portion mc, and the inner oil groove md are formed in the outer peripheral portion of the eccentric shaft M3 in order from the axial outer side. The first oil hole 41 opens in the outer oil groove mb, the second oil hole 42 opens in the displacement portion mc, and the third oil hole 43 opens in the inner oil groove md. The fourth oil hole 44 opens in the shaft outer peripheral surface ma located in the central portion in the axial direction of the eccentric shaft M3.

[0208] The inner circumference of the first journal portion JA1 and the inner circumference of the second journal portion JA2 are in contact with the shaft outer circumference ma located on both sides in the axial direction of the eccentric shaft M3. The first sliding member S1 and the second sliding member S2, the first inner weight IW1 and the second inner weight IW2, and the first connecting rod CN1 and the second connecting rod CN2 are sequentially mounted on the outer circumference of the first journal portion JA1 and the second journal portion JA2 from the axial outer side of the eccentric shaft M3.

[0209] Refer to Fig.38 The first journal JA1 and the second journal JA2 are provided with a plurality of journal oil holes 35a and 35b extending from the through hole 22 to the outer peripheral surface. The journal oil holes 35a and the journal oil holes 35b each include a first journal oil hole 35a and a second journal oil hole 35b. The axial position of the first journal oil hole 35a overlaps with the outer oil groove mb of the eccentric shaft M3 and the axial positions of the first sliding member S1 and the second sliding member S2. The axial position of the second journal oil hole 35b overlaps with the inner oil groove md of the eccentric shaft M3 and the axial positions of the first connecting rod CN1 and the second connecting rod CN2.

[0210] The first axial neck portion JA1 and the second axial neck portion JA2 each have a wall portion surrounding the periphery of the through hole 22. Fig.38 As shown, the wall portion has a thicker wall portion and a thinner wall portion with a thickness in a direction perpendicular to the axial direction of the rotating shaft. The journal oil holes 35a and 35b are provided in the thinner wall portions of the first journal portion JA1 and the second journal portion JA2, respectively.

[0211] Thus, the oil reaching the shaft oil passage 34 is supplied to the first slider S1 and the second slider S2, and the first connecting rod CN1 and the second connecting rod CN2 via the first oil hole 41 and the third oil hole 43, the outer oil groove mb and the inner oil groove md, and the first journal oil hole 35a and the second journal oil hole 35b. In addition, the first slider S1 and the second slider S2 are provided with a slider oil hole h1 opened on a pair of guide surfaces GA1 and GA2. The oil supplied to the first slider S1 and the second slider S2 contributes to the reduction of the contact friction between the first slider S1 and the second slider S2 and the guide bodies 30 and 32.

[0212] The displacement portion mc has a gap between the inner circumferential surface of each of the journals JA1 and JA2 and the displacement portion mc. Thus, the contact resistance between each of the journals JA1 and JA2 and the eccentric shaft M3 is reduced. Lubricating oil is filled into the gap formed by the displacement portion mc to lubricate the gap between each of the journals JA1 and JA2 and the eccentric shaft M3. The second oil hole 42 opened in the displacement portion mc has a smaller diameter than the first oil hole 41 and the third oil hole 43 opened in the outer oil groove mb and the inner oil groove md. Thus, reliable oil supply to each sliding member S1, S2 and each connecting rod CN1, CN2 is sought.

[0213] The fourth oil hole 44 opened in the axial center of the eccentric shaft M3 supplies oil between the pair of journals JA1 and JA2. Connecting rods CN1 and CN2 are supported in the axial middle of each journal. Oil from the fourth oil hole 44 is supplied between the pair of connecting rods CN1 and CN2 adjacent to each other in the axial center of the eccentric shaft M3.

[0214] That is, the drive device 10 having the above structure comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first central axis C1, and the eccentric shaft M3 has a second central axis C2 parallel to the first central axis C1 and is located at a position eccentric to the main shafts M1, M2, and both ends of the main shafts M1, M2 in the axial direction are supported on the housing 12 in a manner that allows them to rotate freely around the first central axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second central axis C2, and the second crankshaft CR2 comprises a first shaft neck JA1 that is eccentric in one direction relative to the second central axis C2 and a second shaft neck JA2 that is eccentric in another direction relative to the second central axis C2. Neck JA2; a first sliding member S1, which is rotatably arranged on the first shaft neck portion JA1; a second sliding member S2, which is rotatably arranged on the second shaft neck portion JA2; a first movable body (a first piston P1, a connecting rod CN1), which is rotatably connected to the first shaft neck portion JA1 and moves linearly in a first direction (Y direction) orthogonal to the first center axis C1 as the first shaft neck portion JA1 moves; a first guide body 30, which is arranged on the housing 12 and guides the movement of the first sliding member S1 along the first direction; and a second guide body 32, which is arranged on the housing 12 and guides the movement of the second sliding member S2 along a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction.

[0215] Furthermore, the eccentric shaft M3 is a hollow shaft, and the internal space of the eccentric shaft M3 is configured as an in-shaft oil passage 34 for supplying lubricating oil to the second crankshaft CR2 and movable parts supported by the second crankshaft CR2. The eccentric shaft M3 is provided with a plurality of oil holes 41 to 44 extending radially outward from the in-shaft oil passage 34 and opening at the outer periphery of the eccentric shaft M3.

[0216] According to this structure, lubricating oil can be supplied to the movable parts supported by the eccentric shaft M3 by means of the shaft oil passage 34 and the plurality of oil holes 41 to 44 formed in the eccentric shaft M3. Thus, a drive device can be provided that satisfies the following expectation: even if a complex mechanism such as the double-axis swing linear drive mechanism 20 is used, it is desired to maintain good operation for a long time.

[0217] (Structure of the base end side of the cylinder liner)

[0218] Reference Figure 39 to Figure 41B The first cylinder 14a and the second cylinder 14b each include a cylindrical cylinder sleeve 15, 16 into which the piston P1 or P2 is inserted in a reciprocating manner. Each cylinder sleeve 15, 16 has a base end (one end in the cylinder axial direction) 15a, 16a facing the crank chamber side of the crankcase 12 that accommodates the crankshafts CR1, CR2.

[0219] Refer to Fig.37In the drive device 10 of the embodiment, the connecting rods CN1, CN2, the inner weights IW1, IW2, and the sliding members S1, S2 are sequentially assembled in the axial direction to the first journal JA1 and the second journal JA2 of the second crankshaft CR2. A retaining ring 24 is installed at the ends of the first journal JA1 and the second journal JA2 located axially outside the second crankshaft CR2, which serves as a retaining member for the movable member assembled to each journal. The retaining ring 24 is installed at Fig.31 and Fig.32 The annular groove 25 shown in the figure. Thus, the movable parts are prevented from being separated from the journals with a simple and compact structure. In the case where the guide member 30C is an integral part having an annular shape (see Fig.21 ), the guide member 30C is also pre-assembled on the periphery of the sliding member.

[0220] Furthermore, the eccentric shaft M3 is inserted through the through hole 22 of each journal portion, and the first counterweight W1 and the second counterweight W2 (including the first main shaft M1 and the second main shaft M2) are respectively mounted and fixed to the protruding shaft mt of the eccentric shaft M3. Thus, a crankshaft assembly CRA is formed in which movable parts such as connecting rods CN1, CN2, inner counterweights IW1, IW2, and sliders S1, S2 are assembled to the second crankshaft CR2, and the eccentric shaft M3 and the counterweights W1, W2 are assembled.

[0221] The pistons corresponding to the connecting rods CN1 and CN2 are pre-assembled at the small ends of the connecting rods CN1 and CN2. Generally, when inserting the piston into the cylinder, a cylindrical piston ring compressor is used to reduce the outer diameter of the piston ring, and the piston is inserted into the cylinder from the cylinder head side. However, when the pistons P1 and P2 constituting a part of the crankshaft assembly CRA are inserted into the cylinders 14a and 14b, the pistons P1 and P2 are inserted into the cylinders 14a and 14b from the crankcase side, not from the cylinder head side. Therefore, the piston ring compressor interferes with other components and cannot be used.

[0222] In the embodiment, a conical piston ring guide surface 15b, 16b whose diameter increases toward the end side of the cylinder sleeves 15, 16 is formed on the inner circumference of the base end portions 15a, 16a of the cylinder sleeves 15, 16 on the crank chamber side. Thus, even without using a piston ring compressor, the pistons P1, P2 can be inserted into the cylinder sleeves 15, 16 by pressing the pistons P1, P2 into the cylinder sleeves 15, 16 in the axial direction, thereby reducing the diameter of the piston rings along the inclination of the piston ring guide surfaces 15b, 16b.

[0223] In particular, in a dual-cylinder drive device 10, after one piston is inserted into the cylinder liner, the remaining components including the connecting rod are swung while the other piston is coaxially arranged on the base end side of the corresponding cylinder liner. In this state, the other piston is inserted into the corresponding cylinder liner along the axial direction. At this time, it is necessary to arrange the other piston and the cylinder liner coaxially in advance, so the counterweights W1, W2, IW1, and IW2 protruding in the radial direction of the crankshaft assembly CRA are likely to interfere with the base ends 15a and 16a of the cylinder liners 15 and 16.

[0224] In the above structure, arc-shaped notches 15c and 16c protruding toward the top end side (cylinder head side) of the cylinder liners 15 and 16 as viewed from the crankshaft axial direction are formed at both sides of the base end portions 15a and 16a of the cylinder liners 15 and 16 (the portions expected to interfere with the counterweight). As a result, the operation of inserting the pistons P1 and P2 of the crankshaft assembly CRA into the corresponding cylinder liners 15 and 16 can be performed while avoiding interference between the base end portions 15a and 16a of the cylinder liners 15 and 16 and the counterweight of the crankshaft assembly CRA. By forming the arc-shaped notches 15c and 16c on both sides in the crankshaft axial direction, rather than simply shortening the base end portions 15a and 16a of the cylinder liners 15 and 16, the effect of compressing the piston ring can be maintained, while avoiding interference between the cylinder liners 15 and 16 and the counterweight.

[0225] That is, the drive device 10 having the above structure comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first central axis C1, and the eccentric shaft M3 has a second central axis C2 parallel to the first central axis C1 and is located at a position eccentric to the main shafts M1, M2, and both ends of the main shafts M1, M2 in the axial direction are supported on the housing 12 in a manner that allows them to rotate freely around the first central axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second central axis C2, and the second crankshaft CR2 comprises a first shaft neck JA1 that is eccentric in one direction relative to the second central axis C2 and a second shaft neck JA2 that is eccentric in another direction relative to the second central axis C2; a first sliding member S1, which is rotatable manner is arranged on the first shaft neck JA1; the second sliding member S2 is rotatably arranged on the second shaft neck JA2; the first movable body (the first piston P1, the connecting rod CN1) is connected to the first shaft neck JA1 in a rotatable manner, and moves linearly in the first direction (Y direction) orthogonal to the first center axis C1 as the first shaft neck JA1 moves; the first guide body 30 is arranged on the housing 12, and guides the movement of the first sliding member S1 along the first direction; and the second guide body 32 is arranged on the housing 12, and guides the movement of the second sliding member S2 along the second direction (Z direction) orthogonal to the first center axis C1 and to the first direction; and the third guide body 14a (the first cylinder 14a) is arranged on the housing 12, and guides the linear motion of the first movable body.

[0226] Furthermore, the third guide body 14a has a first cylinder 14a which is arranged on the housing 12 and extends in the first direction, and the first movable body has a first piston P1 which is inserted into the cylinder sleeve 15 of the first cylinder 14a in a manner that allows reciprocating movement in the first direction, and a tapered inner circumferential surface 15b whose diameter increases toward the end side is formed at the base end portion 15a of the cylinder sleeve 15 on the housing 12 side, and a notch 15c which is arc-shaped when viewed from the axial direction of the second crankshaft CR2 is formed.

[0227] According to this structure, the base ends 15a and 16a of the cylinder sleeves 15 and 16 are formed with tapered inner peripheral surfaces 15b and 16b whose diameters increase toward the distal end. Therefore, the tapered inner peripheral surfaces 15b and 16b serve as guide surfaces for the compression piston rings. Therefore, even without using a piston ring compressor, the pistons P1 and P2 can be inserted into the cylinder sleeves 15 and 16 from the housing 12 side. Moreover, in a state where the second crankshaft CR2 is pre-assembled with movable parts such as connecting rods CN1, CN2, internal counterweights IW1, IW2 and sliding parts S1, S2 and assembled with an eccentric shaft M3 and counterweights W1, W2 to form a crankshaft assembly CRA, even if the pistons P1, P2 are inserted into the cylinder liners 15, 16 from the housing 12 side, it is possible to suppress interference between the counterweight and the base end portions 15a, 16a of the cylinder liners 15, 16 by forming notches 15b, 16b on both sides of the base end portions 15a, 16a of the cylinder liners 15, 16 in the axial direction of the crankshaft.

[0228] Thus, it is possible to provide a driving device that satisfies the desire to facilitate manufacturing and assembly even when a complex mechanism such as the biaxial swing linear driving mechanism 20 is employed.

[0229] (Weight reduction structure of connecting rod)

[0230] Reference Fig.44A , Fig.44BThe driving device 10 of this structure comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first central axis C1, and the eccentric shaft M3 has a second central axis C2 parallel to the first central axis C1 and is located at an eccentric position relative to the main shafts M1, M2, and both ends of the main shafts M1, M2 in the axial direction are supported on the housing 12 in a manner that they can rotate freely around the first central axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that they can rotate freely around the second central axis C2, and the second crankshaft CR2 comprises a first axial neck JA1 that is eccentric in one direction relative to the second central axis C2 and a second axial neck JA2 that is eccentric in another direction relative to the second central axis C2; a first sliding member S1, which is rotatably provided on the first axial neck JA1; a second sliding member S2, which is rotatably provided on the first axial neck JA1; and a second sliding member S2. It is arranged on the second shaft neck JA2 in a manner as follows; the first movable body (the first piston P1, the connecting rod CN1), which is connected to the first shaft neck JA1 in a freely rotatable manner, and moves linearly in a first direction (Y direction) orthogonal to the first center axis C1 as the first shaft neck JA1 moves; the second movable body (the second piston P2 and the connecting rod CN2), which is connected to the second shaft neck JA2 in a freely rotatable manner, and moves linearly in a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction as the second shaft neck JA2 moves; the first guide body 30, which is arranged in the housing 12, and guides the movement of the first sliding member S1 along the first direction; and the second guide body 32, which is arranged in the housing 12, and guides the movement of the second sliding member S2 along a second direction (Z direction) orthogonal to the first center axis C1 and to the first direction.

[0231] Furthermore, the link CN1 of the first moving body and the link CN2 of the second moving body have weight-reducing portions that are different from each other.

[0232] The connecting rod CN1 of the first movable body and the connecting rod CN2 of the second movable body each have a large end 17a, 18a located on the side of the shaft neck and a small end 17b, 18b located on the side of the piston. In the connecting rod CN1, a rod portion 17c is provided between the large end 17a and the small end 17b. A weight-reducing portion 17d provided on both sides in the axial direction is formed on the rod portion 17c. Similarly, in the connecting rod CN2, a rod portion 18c is provided between the large end 18a and the small end 18b. A weight-reducing portion 18d provided on both sides in the axial direction is formed on the rod portion 18c. By adjusting the shape and depth of each of the weight-reducing portions 17d, 18d, the rotational balance of the drive shaft can be easily achieved in the driving device 10 having cylinders of different diameters.

[0233] Thus, it is possible to provide a driving device that satisfies the desire to facilitate manufacturing and assembly even when a complex mechanism such as the biaxial swing linear driving mechanism 20 is employed.

[0234] (Connection structure between the main shaft and the motor drive shaft)

[0235] Reference Fig.43 An electric motor 50 serving as a driving source of the driving device 10 is disposed on one side in the axial direction of the driving device 10. A driving shaft (motor driving shaft) 51 of the electric motor 50 is coaxially connected to the main shaft M2 on one side in the axial direction of the driving device 10. The motor driving shaft 51 is coaxially connected to the second main shaft M2 (or the first main shaft M1) using a coupling device 55.

[0236] The motor drive shaft 51 is formed in a hollow shape and is open on both sides in the axial direction of the electric motor 50. The motor drive shaft 51 approaches the main shaft M2 from the axial outer side, and the main shaft M2 is inserted and connected to one side in the axial direction of the motor drive shaft 51. A threaded hole opened at the end surface is formed in the main shaft M2. The connecting tool 55 is inserted into the motor drive shaft 51 from the other end side.

[0237] Refer to Fig.42A , Fig.42B The connecting device 55 includes a connecting bolt 56 and an expanding diameter collar device 57. The connecting bolt 56 is screwed into and fastened to a threaded hole coaxially formed along the axis of the main shaft M2. The expanding diameter collar device 57 can abut against the reduced diameter portion 52 formed on the inner circumference of the drive shaft 51 (external shaft) from the axial outside. The expanding diameter collar device 57 moves a plurality of movable bodies (split bodies 59a described later) uniformly to the radial outside by tightening the connecting bolt 56.

[0238] The diameter expansion collar device 57 includes an inner member 58 and an outer member 59. The inner member 58 is formed with a countersunk hole for the head of the connecting bolt 56 to be immersed. The inner member 58 forms an outer tapered surface whose diameter decreases toward the top end side of the bolt shank (the main shaft M2 side). The inner member 58 has a truncated cone shape. The outer member 59 forms an inner tapered surface along the outer tapered surface of the inner member 58. The outer member 59 forms an outer peripheral surface whose diameter is smaller than the inner peripheral surface of the motor drive shaft 51. The outer member 59 has a cylindrical shape.

[0239] The outer member 59 is equally divided in the circumferential direction into a plurality of (three in the figure) divided bodies 59 a .

[0240] The single connecting tool 55, for example, uses an annular elastic member 59b wound around the outer peripheral groove of the outer member 59 to hold the plurality of segment bodies 59a in a reduced diameter state toward the radial inner side (see Fig.42A ).

[0241] The connecting tool 55 penetrates the motor drive shaft 51, and the connecting bolt 56 is installed and fastened to the main shaft M2, thereby compressing the expanded diameter collar device 57 in the axial direction between the reduced diameter portion 52 of the drive shaft 51 and the head of the connecting bolt 56. As a result, the inner member 58 is pressed into the recessed portion surrounded by the inner conical surface of the outer member 59. Then, along the outer conical surface of the inner member 58 and the inner conical surface of the outer member 59, each segment 59a of the outer member 59 overcomes the force of the elastic member 59b and moves radially outward.

[0242] Each segment 59a moves uniformly in the radial direction outward along the inner and outer conical surfaces, and the structure is in an expanded diameter state in which the outer peripheral surface of each segment 59a abuts against the inner peripheral surface of the motor drive shaft 51 (see Fig.42B ). By further tightening the connecting bolts 56, the outer circumferential surface of each segment 59a pushes the inner circumferential surface of the motor drive shaft 51, thereby aligning the main shaft M2 and the motor drive shaft 51. In this way, the main shaft M2 and the motor drive shaft 51 can be coaxially connected with high precision by a single action of tightening the connecting bolts 56 of the connecting tool 55.

[0243] That is, the drive device 10 of the above structure comprises: a housing 12; a first crankshaft CR1, which comprises main shafts M1, M2 and an eccentric shaft M3, wherein the main shafts M1, M2 have a first central axis C1, the eccentric shaft M3 has a second central axis C2 parallel to the first central axis C1 and is located at a position eccentric to the main shafts M1, M2, and both ends of the main shafts M1, M2 in the axial direction are supported on the housing 12 in a manner that allows them to rotate freely around the first central axis C1; a second crankshaft CR2, which is supported on the eccentric shaft M3 in a manner that allows them to rotate freely around the second central axis C2, and the second crankshaft CR2 comprises a first axial neck JA1 that is eccentric in one direction relative to the second central axis C2 and a second axial neck JA2 that is eccentric in another direction relative to the second central axis C2; a first sliding member S1, which is rotatably provided on the first axial neck JA1; and a second sliding member S2, which is rotatably supported on the eccentric shaft M3. The first movable body (first piston P1 and connecting rod CN1) is rotatably connected to the first shaft neck portion JA1 and moves linearly in a first direction (Y direction) perpendicular to the first center axis C1 along with the movement of the first shaft neck portion JA1; the second movable body (second piston P2 and connecting rod CN2) is rotatably connected to the second shaft neck portion JA2 and moves linearly in a second direction (Z direction) perpendicular to the first center axis C1 and the first direction along with the movement of the second shaft neck portion JA2; the first guide body 30 is arranged in the housing 12 and guides the movement of the first sliding member S1 along the first direction; and the second guide body 32 is arranged in the housing 12 and guides the movement of the second sliding member S2 along a second direction (Z direction) perpendicular to the first center axis C1 and the first direction.

[0244] Furthermore, the main shafts M1 and M2 are coaxially connected to a hollow drive shaft 51 arranged on the axial outside in a state of being inserted into the drive shaft 51. The connection between the main shafts M1 and M2 and the drive shaft 51 is achieved by using a connecting device 55 that penetrates the drive shaft 51 from the axial outside. The connecting device 55 includes: a connecting bolt 56, which is installed in a threaded hole formed in the axial center portion of the main shaft M2; and an expanding diameter collar device 57, which can abut against the reduced diameter portion 52 formed on the inner periphery of the drive shaft 51 from the axial outside, and by tightening the connecting bolt 56, a plurality of movable bodies are evenly moved radially outward to become an expanded diameter state.

[0245] According to this configuration, the main shaft M2 and the motor drive shaft 51 can be coaxially connected with high accuracy by a single operation of tightening the connecting bolt 56 of the connecting tool 55 .

[0246] Thus, it is possible to provide a driving device that satisfies the desire to facilitate manufacturing and assembly even when a complex mechanism such as the biaxial swing linear driving mechanism 20 is employed.

[0247] Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. The new embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. The embodiment and its modifications are included in the scope and purpose of the invention, and are included in the invention described in the claims and the scope of its equivalent.

[0248] In the embodiments disclosed in this specification, for a component composed of multiple objects, the multiple objects can also be integrated, and conversely, for a component composed of one object, it can be divided into multiple objects. Regardless of whether it is integrated or not, it can be configured in a manner that can achieve the purpose of the invention.

Claims

1. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; as well as a second guide body provided on the housing and guiding the movement of the second slide member in a second direction perpendicular to the first central axis and perpendicular to the first direction, At least one of the first guide body and the second guide body is configured separately from the housing and is detachably fixed to the housing.

2. The driving device according to claim 1, wherein: The guide body, which is separate from the housing, is fixed to the housing by fastening with bolts. The bolt is arranged in a direction perpendicular to the first central axis and perpendicular to a moving direction of the slider guided by the separate guide body.

3. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; as well as a second guide body provided on the housing and guiding the movement of the second slide member in a second direction perpendicular to the first central axis and perpendicular to the first direction, At least one of the first sliding member and the second sliding member includes a pair of side surfaces extending in the moving direction on both sides in a width direction orthogonal to the moving direction of the first sliding member as viewed from the axial direction along the first central axis. The side surface portion includes an arc-shaped portion having a curvature that is convex toward the outside in the width direction when viewed in the axial direction along the first central axis.

4. The driving device according to claim 3, wherein: The side surface portion has a straight line portion along the moving direction as viewed from the axial direction along the first central axis in an intermediate range of the arc-shaped portion in the moving direction.

5. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; as well as a second guide body provided on the housing and guiding the movement of the second slide member in a second direction perpendicular to the first central axis and perpendicular to the first direction, The first journal portion and the second journal portion are formed separately from each other and are integrally connected in the axial direction to form the second crankshaft.

6. The driving device according to claim 5, wherein: The second crankshaft has a through hole extending through the first journal portion and the second journal portion. The eccentric shaft passes through the through hole. Tapered surfaces inclined with respect to the axial direction and the radial direction are formed at the opening peripheral edge portion of the through hole and the annular corner portion formed on the outer periphery of the eccentric shaft.

7. The driving device according to claim 5 or 6, wherein: The first crankshaft includes a first counterweight disposed at one end of the eccentric shaft and a second counterweight disposed at the other end of the eccentric shaft. At least one of the first weight and the second weight is configured separately from the eccentric shaft.

8. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; as well as a second guide body provided on the housing and guiding the movement of the second slide member in a second direction perpendicular to the first central axis and perpendicular to the first direction, A separate counterweight is detachably mounted on at least one of the first journal portion and the second journal portion. The split counterweight has an arc portion which contacts the range of the eccentric weight set on the outer peripheral surface of the shaft neck on the circumferential direction of the shaft neck where the split counterweight itself is installed, and an open portion which is missing in the circumferential direction is formed in the range where the eccentric weight is not set.

9. The driving device according to claim 8, wherein: A concave portion is formed on the journal portion for mounting the counterweight of the split body, which is recessed toward the inner peripheral side relative to the outer peripheral surface. The split counterweight is formed with a convex portion inserted into the concave portion, At least one of the concave portion and the convex portion has a surface intersecting with the circumferential direction of the outer peripheral surface as a surface capable of abutting against the other in the circumferential direction.

10. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; as well as a second guide body provided on the housing and guiding the movement of the second slide member in a second direction perpendicular to the first central axis and perpendicular to the first direction, The eccentric shaft is a hollow shaft, and the internal space of the eccentric shaft is provided as an in-shaft oil passage for supplying lubricating oil to the second crankshaft and a movable member supported by the second crankshaft. The eccentric shaft has an oil hole formed therein. The oil hole extends radially outward from the in-shaft oil passage and opens at an outer peripheral portion of the eccentric shaft.

11. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; a second guide body provided on the housing and guiding the movement of the second slide member along a second direction perpendicular to the first central axis and perpendicular to the first direction; as well as a third guide body, which is provided on the housing and guides the linear motion of the first moving body; The third guide body includes a first cylinder provided on the housing and extending in the first direction. The first movable body includes a first piston inserted into a cylinder sleeve of the first cylinder so as to be reciprocatable in the first direction. A tapered inner peripheral surface whose diameter increases toward a distal end is formed at a base end portion of the cylinder liner on the housing side, and a notch is formed that is arc-shaped when viewed in the axial direction of the second crankshaft.

12. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a second movable body connected to the second journal portion in a rotatable manner and linearly moving in a second direction perpendicular to the first central axis and perpendicular to the first direction as the second journal portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; as well as a second guide body provided on the housing and guiding the movement of the second slide member in a second direction perpendicular to the first central axis and perpendicular to the first direction, The first movable body comprises: a first piston capable of reciprocating in the first direction; and a first connecting rod having one end connected to the first piston and the other end connected to the first journal portion in a rotatable manner, The second movable body comprises: a second piston capable of reciprocating in the second direction; and a second connecting rod having one end connected to the second piston and the other end connected to the second journal portion in a rotatable manner, The first link and the second link have different weight reduction portions.

13. A driving device, wherein: The drive device has: case; A first crankshaft including a main shaft and an eccentric shaft, wherein the main shaft has a first central axis, the eccentric shaft has a second central axis parallel to the first central axis and is located eccentrically relative to the main shaft, and both ends of the main shaft in the axial direction are supported by the housing in a manner rotatable around the first central axis; a second crankshaft supported on the eccentric shaft in a manner rotatable about the second central axis, the second crankshaft comprising a first journal portion eccentric in one direction relative to the second central axis and a second journal portion eccentric in another direction relative to the second central axis; a first sliding member rotatably disposed on the first journal portion; a second sliding member rotatably disposed on the second journal portion; a first movable body connected to the first shaft neck portion in a rotatable manner and linearly moving in a first direction orthogonal to the first central axis as the first shaft neck portion moves; a first guide body, which is disposed on the housing and guides the movement of the first sliding member along the first direction; a second guide body provided on the housing and guiding the movement of the second slide member along a second direction perpendicular to the first central axis and perpendicular to the first direction; as well as a third guide body, which is provided on the housing and guides the linear motion of the first moving body; The main shaft is coaxially connected to a hollow outer shaft arranged axially outside in a state of being inserted into the outer shaft. The connection between the main shaft and the external shaft is performed by using a connection tool that penetrates the external shaft from the axially outer side. The connecting device comprises: a connecting bolt, which is installed in a threaded hole formed in the axial center part of the main shaft; and an expanding diameter collar device, which can abut against the reduced diameter part formed on the inner periphery of the external shaft from the axial outside, and by tightening the connecting bolt, multiple movable bodies are evenly moved radially outward to become an expanded diameter state.

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