Driving device

Abstract

To provide a driving device which includes an oscillation linear driving mechanism which can reduce vibration and noise at the time of driving.SOLUTION: A driving device 1 includes: a housing; a crank shaft 6 rotatably supported at the housing; cylindrical blocks 17, 18 rotatably supported at the crank shaft 6; sliders 8, 9 and pistons 11, 12 rotatably supported at the cylindrical blocks 17, 18; and a guide 43 supported at the housing via a plate spring 42, and for restricting the movement of the sliders 8, 9 to linear movement in one direction. The sliders 8, 9 include a pair of a Z side surface 8z and a Y side surface 9y oppositely arranged with a main rotation axis Am being the center. The guide 43 includes a surface 43a coming into contact with the Z side surface 8z and the Y side surface 9y. The plate spring 42 permits the inclination of the guide 43 with respect to the housing.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a drive device. [Background technology]

[0002] A conventional drive device includes an oscillating linear drive mechanism that converts the rotational or oscillating motion of an eccentrically rotating rotor into linear motion. This drive device includes a crankshaft rotatably supported on a housing, a slider (crank connecting member) rotatably supported on an eccentric shaft (crank pin) of the crankshaft, and a guide supported on the housing that restricts the movement of the slider to linear movement in one direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-111921 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, the rotational torque of the crankshaft is also transmitted to the slider. The guide converts the slider into linear motion while suppressing this rotational torque. As a result, at certain rotational phases of the crankshaft, a large rotational torque is applied from the slider to the guide. This causes problems such as increased vibration and noise during operation.

[0005] The present invention provides a drive device equipped with an oscillating linear drive mechanism that can reduce vibration and noise during driving. [Means for solving the problem]

[0006] A drive device according to one aspect of the present invention includes a housing, a crankshaft rotatably supported by the housing, a cylindrical block rotatably supported by the crankshaft, a slider and a moving body rotatably supported by the cylindrical block, and a guide supported by the housing via an elastic member and restricting movement of the slider to linear movement in one direction, wherein the crankshaft is supported by a main shaft rotatably supported by the housing about a first rotation axis, and an eccentric shaft having an axis centered on a second rotation axis that is eccentric with respect to the first rotation axis. the cylindrical block rotates around the first rotation axis and is rotatably supported on the second rotation axis by the eccentric shaft, the slider has a pair of slider-side flat surfaces arranged opposite each other around the first rotation axis, the slider-side flat surfaces extending along the one direction, the guide has a pair of guide-side flat surfaces in contact with the slider-side flat surfaces, the guide-side flat surfaces extending along the slider-side flat surfaces, and the elastic member allows the guide to tilt relative to the housing.

[0007] In this way, the guide is provided on the housing via an elastic member. This allows the guide to tilt so as to follow the behavior of the slider when the rotational torque of the crankshaft is applied to the slider. This prevents the rotational torque from the slider applied to the guide from changing significantly depending on the rotational phase of the crankshaft. As a result, vibration and noise during operation can be reduced in a drive device equipped with an oscillating linear drive mechanism.

[0008] In the above configuration, the elastic member allows the guide to tilt in a direction around the first rotation axis.

[0009] In the above configuration, the elastic member includes a leaf spring.

[0010] In the above configuration, the elastic member has a base portion fixed to the housing and a pair of legs extending from both sides of the base portion in the one direction, and both end sides of the base portion in the one direction extend so as to gradually move away from the housing as they move toward the ends, and the pair of legs extend so as to gradually move away from the housing as they move away from the base portion.

[0011] In the above configuration, the width of the leg portion in the thickness direction and in the direction perpendicular to the one direction is smaller than the width of the base portion in the thickness direction and in the direction perpendicular to the one direction.

[0012] In the above configuration, the thickness of the connection portion between the base portion and the leg portion is thinner than the thickness of the base portion.

[0013] In the above configuration, the ends of the base portion are formed so that the width gradually decreases toward the ends.

[0014] In the above configuration, the leg and the guide include a fixing portion that fixes them to each other, and the fixing portion allows the guide to tilt relative to the leg in a direction around the first rotation axis.

[0015] In the above configuration, the fixing portion includes an insertion hole formed in the guide and extending along a direction perpendicular to the one direction, and a support shaft provided in the leg portion and inserted into the insertion hole. [Effects of the Invention]

[0016] A drive device equipped with the above-described oscillating linear drive mechanism can reduce vibration and noise during driving. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view schematically illustrating the appearance of a drive device according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view of a two-axis oscillating linear drive mechanism according to an embodiment of the present invention. [Figure 3]FIG. 4 is a perspective view of the drive mechanism according to the embodiment of the present invention, as viewed from the second side wall side. [Figure 4] FIG. 4 is an exploded perspective view of FIG. 3. [Figure 5] FIG. 2 is an exploded perspective view of a guide unit according to an embodiment of the present invention. [Figure 6] FIG. 2 is a perspective view of the leaf spring according to the embodiment of the present invention, as viewed from the guide side. [Figure 7] FIG. 2 is a perspective view of a guide as viewed from the leaf spring side in the embodiment of the present invention. [Figure 8] 5A to 5C are explanatory diagrams showing the behavior of each slider and each guide unit in the embodiment of the present invention. [Figure 9] 10 is a graph showing a change in rotational torque from a slider applied to a guide in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, an embodiment of the present invention will be described with reference to the drawings.

[0019] <Drive unit> Fig. 1 is a perspective view schematically showing the appearance of the drive device 1. Fig. 2 is a perspective view of the two-axis oscillating linear drive mechanism 5. 1 and 2, the drive device 1 is configured as, for example, a two-cylinder compressor or generator. The drive device 1 includes a rectangular housing (crankcase) 2, a first cylinder 3 and a second cylinder 4 attached to the housing 2, and a two-axis oscillating linear drive mechanism (hereinafter referred to as the drive mechanism) 5 provided inside the housing 2 and to which the cylinders 3 and 4 are attached.

[0020] The housing 2 has a rectangular bottom wall 2a, pentagonal first and second side walls 2b and 2c rising from two opposing sides of the bottom wall 2a, third and fourth side walls 2d and 2e rising from the other two opposing sides of the bottom wall 2a, and a first and second top wall 2f and 2g connecting to the upper edges of the first to fourth side walls. Each of the top walls 2f and 2g is inclined with respect to the bottom wall 2a. The angle between the top walls 2f and 2g is 90 degrees. In the following description, the direction in which the side walls 2b and 2c face each other and which is parallel to the bottom wall 2a is referred to as the X-direction. The direction normal to the first top wall 2f and perpendicular to the X-direction is referred to as the Y-direction. The direction normal to the second top wall 2g and perpendicular to the X-direction and Y-direction is referred to as the Z-direction.

[0021] The first cylinder 3 protrudes from the first ceiling wall 2f toward the opposite side to the bottom wall 2a along the Y direction. The second cylinder 4 protrudes from the second ceiling wall 2g toward the opposite side to the bottom wall 2a along the Z direction.

[0022] <Drive mechanism> Fig. 2 is a perspective view of the drive mechanism 5 seen from the first side wall 2b side. Fig. 3 is a perspective view of the drive mechanism 5 seen from the second side wall 2c side. Fig. 4 is an exploded perspective view of Fig. 3. As shown in Figures 1 to 4, the drive mechanism 5 includes a crankshaft 6 rotatably supported in the housing 2, two cylindrical blocks 17, 18 (journals; first cylindrical block 17, second cylindrical block 18) rotatably supported on the crankshaft 6, two sliders 8, 9 (first slider 8, second slider 9) rotatably supported separately on each of the cylindrical blocks 17, 18, and two pistons 11, 12 (first piston 11, second piston 12; examples of moving bodies in the claims), and four guide units 13 provided in the housing 2.

[0023] The crankshaft 6 is disposed parallel to the X direction. The crankshaft 6 includes two main shafts 14, 15 (first main shaft 14 and second main shaft 15) disposed on both sides in the axial direction, and an eccentric shaft 16 disposed between the two main shafts 14, 15 and connected to each of the main shafts 14, 15 so as not to rotate relative to each other. The main rotation axes Am of the two main shafts 14, 15 coincide with each other. The two main shafts 14, 15 are rotatably supported by the housing 2 via rolling bearings 21, 22, respectively. That is, the crankshaft 6 rotates about the main rotation axis Am.

[0024] Counterweights 23 and 24 are respectively provided on the two main shafts 14 and 15. The centers of gravity of the two counterweights 23 and 24 are shifted in the same direction with respect to the main rotation axis Am. The eccentric rotation axis Ae of the eccentric shaft 16 is eccentric with respect to the main rotation axis Am. Two cylindrical blocks 17 and 18 are rotatably supported on the eccentric shaft 16.

[0025] Of the two cylindrical blocks 17, 18, the first cylindrical block 17 is disposed on the first main shaft 14 side of the axial center of the eccentric shaft 16. The second cylindrical block 18 is disposed on the second main shaft 15 side of the axial center of the eccentric shaft 16. The cylindrical blocks 17, 18 have the same configuration. Therefore, in the following explanation, only the first cylindrical block 17 will be explained, and an explanation of the second cylindrical block 18 will be omitted. An explanation of the second cylindrical block 18 will be given as necessary.

[0026] A shaft insertion hole 25 is formed in the first cylindrical block 17 so as to penetrate therethrough in the axial direction. The shaft insertion hole 25 is eccentric with respect to the central axis Ac of the first cylindrical block 17 (hereinafter referred to as the cylindrical central axis). The amount of eccentricity of the shaft insertion hole 25 is the same as the amount of eccentricity of the eccentric rotation axis Ae with respect to the main rotation axis Am. The eccentric shaft 16 is rotatably inserted into the shaft insertion hole 25. A counterweight 26 is provided at the axial center of the outer peripheral surface 17a of the first cylindrical block 17. The center of gravity of the counterweight 26 is shifted in the same direction as the eccentricity of the shaft insertion hole 25 with respect to the cylindrical central axis Ac.

[0027] The second cylindrical block 18 is disposed symmetrically with the first cylindrical block 17 with respect to the axial center of the eccentric shaft 16. The assembly phase of the second cylindrical block 18 is shifted by 180° with respect to the first cylindrical block 17.

[0028] The first piston 11 is rotatably supported on the outer circumferential surface 17a of the first cylindrical block 17, closer to the second cylindrical block 18 than the counterweight 26. The first piston 11 includes a first connecting rod 27 rotatably supported on the outer circumferential surface 17a of the first cylindrical block 17, and a first piston body 28 provided at the tip of the first connecting rod 27.

[0029] The first piston body 28 is formed in a cylindrical shape with a bottom. The first piston body 28 is disposed with its bottom surface 28a facing away from the first connecting rod 27. The first piston body 28 is provided so as to be rotatable within a predetermined range with the X direction as its axis relative to the first connecting rod 27. The first piston 11 is housed in the first cylinder 3 as the first piston body 28.

[0030] The second piston 12 is rotatably supported on the outer circumferential surface 18a of the second cylindrical block 18, closer to the first cylindrical block 17 than the counterweight 26. The second piston 12 includes a second connecting rod 31 rotatably supported on the outer circumferential surface 18a of the second cylindrical block 18, and a second piston body 32 rotatably provided at the tip of the second connecting rod 31.

[0031] The second piston body 32 is formed in a cylindrical shape with a bottom. The diameter of the second piston body 32 is larger than the diameter of the first piston body 28. The second piston body 32 is disposed with its bottom surface 32a facing away from the second connecting rod 31. The second piston body 32 is provided so as to be rotatable within a predetermined range with the X direction as its axis relative to the second connecting rod 31. The second piston 12 is housed in the second cylinder 4. That is, the phase of the second piston 12 is shifted by 90° with respect to the first piston 11.

[0032] The first slider 8 is rotatably supported on the outer peripheral surface 17a of the first cylindrical block 17, on the side opposite the second cylindrical block 18 from the counterweight 26. The first slider 8 is a plate-like member formed in a square shape when viewed from the X direction. The thickness direction of the first slider 8 coincides with the X direction. That is, the first slider 8 has a pair of flat Y side surfaces 8y that face each other in the Y direction and extend in the Z direction, and a pair of Z side surfaces 8z (an example of slider-side flat surfaces in the claims) that face each other in the Z direction and extend in the Y direction.

[0033] A block insertion hole 35 is formed in the first slider 8 over most of the center when viewed from the X direction. The outer peripheral surface 17a of the first cylindrical block 17 is rotatably fitted into the block insertion hole 35. In this way, the first slider 8 is rotatably supported by the first cylindrical block 17.

[0034] The second slider 9 is rotatably supported on the outer circumferential surface 18 a of the second cylindrical block 18 on the side opposite to the first cylindrical block 17 with respect to the counterweight 26 . The second slider 9 has a similar configuration to the first slider 8. That is, the second slider 9 has a pair of flat Y-side surfaces (an example of slider-side flat surfaces in the claims) 9y that face each other in the Y direction and extend in the Z direction, and a pair of Z-side surfaces 9z that face each other in the Z direction and extend in the Y direction. The outer peripheral surface 18a of the second cylindrical block 18 is rotatably fitted into a block insertion hole 36 formed in the second slider 9. This allows the second slider 9 to be rotatably supported by the second cylindrical block 18.

[0035] <Guide unit> Two guide units 13 are arranged on either side of the first slider 8 so as to face the Z side surface 8z of the first slider 8 in the Z direction. Two guide units 13 are arranged on either side of the second slider 9 so as to face the Y side surface 9y of the second slider 9 in the Y direction. These four guide units 13 have the same configuration. For this reason, in the following explanation, only one guide unit 13 of the four guide units 13 that faces the Z side surface 8z of the first slider 8 will be explained, and the other guide units 13 will be assigned the same reference numerals and explanations thereof will be omitted.

[0036] FIG. 5 is an exploded perspective view of the guide unit 13. As shown in FIG. As shown in Figures 2 to 5, the guide unit 13 comprises a leaf spring 42 fixed to the inner surface 2h of the housing 2 via a fixed plate 41, and a guide 43 arranged on the opposite side of the fixed plate 41 across the leaf spring 42, connected to the leaf spring 42, and supported by the leaf spring 42.

[0037] The fixing plate 41 constitutes a part of the housing 2 and is used to fix the guide unit 13 to the housing 2. The fixing plate 41 is formed in a plate shape that is long in the Y direction so as to correspond to the Z side surface 8z of the first slider 8. The fixing plate 41 is fixed to the inner surface 2h of the housing 2, for example, by bolts (not shown). Two female thread portions 41a are formed in the center of the fixing plate 41 in the Y direction. The two female thread portions 41a are arranged side by side in the X direction. The two female thread portions 41a are used to fix the leaf spring 42 to the fixing plate 41.

[0038] FIG. 6 is a perspective view of the leaf spring 42 as seen from the guide 43 side. 5 and 6, the leaf spring 42 is disposed so that its thickness direction is in the Z direction. The leaf spring 42 is formed by integrally molding a base portion 44 disposed on the fixed plate 41 and a pair of legs 45 extending from both sides of the base portion 44 in the Y direction. The base portion 44 is formed in a rectangular shape that is long in the Y direction.

[0039] Two bolt insertion holes 47 are formed in the center in the Y direction of the base portion 44. The two bolt insertion holes 47 are arranged side by side in the X direction so as to be coaxial with the female thread portion 41a of the fixing plate 41. Bolts 48 are inserted into the two bolt insertion holes 47 from the side opposite the fixing plate 41. By tightening these bolts 48 into the female threads 41a of the fixing plate 41, the leaf spring 42 is fixed to the fixing plate 41.

[0040] A tapered portion 46 is formed on each end of the base portion 44 in the Y direction. The tapered portion 46 is tapered so that the width in the X direction gradually decreases toward the tip, which is located on the outer side in the Y direction. The tapered portion 46 extends so as to gradually move away from the fixing plate 41 toward the tip.

[0041] The pair of legs 45 are formed in a rectangular shape that is long in the Y direction when viewed from the Z direction. The pair of legs 45 extend so as to gradually move away from the fixing plate 41 (housing 2) as they move outward in the Y direction, that is, as they move away from the base portion 44. The width of the legs 45 in the X direction is approximately the same as the width of the tip of the tapered portion 46 of the base portion 44. The thickness (plate thickness) T1 of the connection portion 59 between the base portion 44 and the leg portion 45 is thinner than the thickness (plate thickness) T2 of the base portion 44. In other words, the thickness T1 of the connection portion 59 is the thickness of the tip of the tapered portion 46.

[0042] A leaf spring side fixing portion 49 is integrally formed on each of the pair of leg portions 45 at their outer ends in the Y direction. The leaf spring side fixing portion 49 is formed so that its thickness gradually increases toward the outside in the Y direction. The outer end surface of the leaf spring side fixing portion 49 in the Y direction is formed in a circular shape when viewed from the X direction. The leaf spring side fixing portion 49 has a leaf spring side insertion hole 49a that penetrates in the X direction. In other words, the leaf spring side fixing portion 49 is formed in a cylindrical shape with its axial direction aligned with the X direction.

[0043] FIG. 7 is a perspective view of the guide 43 as seen from the leaf spring 42 side. As shown in Figures 5 and 7, guide 43 is formed in the shape of a plate that is long in the Y direction. The length of guide 43 in the Y direction is longer than the length of leaf spring 42 in the Y direction. The thickness direction of guide 43 coincides with the Z direction. The width of guide 43 in the X direction is greater than the width of leaf spring 42 in the X direction. A surface 43a of guide 43 opposite leaf spring 42 (an example of a guide-side flat surface in the claims) faces Z side surface 8z of first slider 8 in the Z direction. Surface 43a of guide 43 is formed flat along the XY plane.

[0044] A recess 51 is formed over the entire center in the Y direction on the back surface 43b of the guide 43 facing the leaf spring 42. Both sides of the recess 51 of the guide 43 are configured as guide-side fixing parts 50. The guide-side fixing parts 50 have the role of connecting the leaf spring 42 and the guide 43 together in cooperation with the leaf spring-side fixing parts 49.

[0045] Specifically, a leaf spring receiving recess 52 is formed on the back surface 43b of the guide-side fixed part 50. The leaf spring receiving recess 52 is formed in a rectangular shape that is long in the Y direction when viewed from the Z direction. As a result, a pair of side wall parts 53 are formed on both sides of each guide-side fixed part 50 in the X direction. The leaf spring-side fixed part 49 is inserted into the leaf spring receiving recess 52.

[0046] A pair of corresponding side wall portions 53 are each formed with a guide-side insertion hole 54 that penetrates in the X direction and is arranged coaxially. Each guide-side insertion hole 54 communicates with a leaf spring-side insertion hole 49a of the leaf spring-side fixing portion 49 inserted into the leaf spring receiving recess 52. In this state, a support shaft 55 is inserted into each guide-side insertion hole 54 and leaf spring-side insertion hole 49a. This connects the leaf spring 42 and the guide 43. The guide-side fixing portion 50 and the leaf spring-side fixing portion 49 allow the guide 43 to tilt relative to the leg portion 45 of the leaf spring 42, and therefore allow the guide 43 to tilt relative to the housing 2.

[0047] More specifically, the guide-side fixed portion 50 and the leaf spring-side fixed portion 49 are connected via a support shaft 55, so that the guide 43 is allowed to tilt relative to the leaf spring 42 in directions around the X-direction as an axis. In addition, the guide-side fixed portion 50 has a chamfered portion 56 formed at the corner between the outer end face 43c in the Y direction and the back face 43b.

[0048] With this configuration, the two guide units 13 arranged corresponding to the first slider 8 have the surfaces 43a of the guides 43 overlapped with the Z side surfaces 8z of the first slider 8. Therefore, the movement of the first slider 8 in the Z direction is restricted by the guide units 13, while movement in the Y direction is permitted. The two guide units 13 arranged corresponding to the second slider 9 have the surfaces 43a of the guides 43 overlapped with the Y side surfaces 9y of the second slider 9. Therefore, the movement of the second slider 9 in the Y direction is restricted by the guide units 13, while movement in the Z direction is permitted.

[0049] <Operation of the drive unit> Next, the operation of the driving device 1 will be described in detail. Fig. 8 is an explanatory diagram showing the behavior of the sliders 8, 9 and the guide units 13. Fig. 8 corresponds to a plan view seen from the first slider 8 side in the X direction. 1 to 4 and 8, first, rotation of an external device such as an electric motor is input to the first main shaft 14 or the second main shaft 15. This rotates the crankshaft 6. More specifically, each of the main shafts 14, 15 rotates about the main rotation axis Am, and the eccentric shaft 16 revolves around the rotation axis Am.

[0050] The eccentric shaft 16 is rotatably inserted into the shaft insertion hole 25 of each cylindrical block 17. The amount of eccentricity of the shaft insertion hole 25 with respect to the cylindrical central axis Ac is the same as the amount of eccentricity of the eccentric rotation axis Ae with respect to the main rotation axis Am. The outer peripheral surfaces 17a, 18a of each cylindrical block 17, 18 rotatably support the corresponding sliders 8, 9 and connecting rods 27, 31 of the corresponding pistons 11, 12. In addition, the first slider 8 of each slider 8, 9 is restricted from moving in the Z direction by the guide unit 13, but is allowed to move in the Y direction. The second slider 9 of each slider 8, 9 is restricted from moving in the Y direction by the guide unit 13, but is allowed to move in the Z direction.

[0051] As a result, the first slider 8 reciprocates (linearly moves) in the Y direction while sliding on the surface 43a of the guide 43 (see arrow My in FIG. 8). Correspondingly, the first cylindrical block 17 reciprocates in the Y direction while rotating about the cylindrical central axis Ac. The first piston 11 reciprocates in the Y direction following the reciprocating movement of the first cylindrical block 17. This causes the first piston body 28 to rise and fall within the first cylinder 3. As a result, the fluid (air, refrigerant, etc.) is repeatedly sucked in, compressed (pressurized), and discharged within the first cylinder 3. Discharge occurs via a discharge port (not shown).

[0052] Meanwhile, the second slider 9 reciprocates in the Z direction while sliding on the surface 43a of the guide 43 (see arrow Mz in FIG. 8). Correspondingly, the second cylindrical block 18 reciprocates in the Z direction while rotating about the cylindrical central axis Ac. The second piston 12 reciprocates in the Z direction following the reciprocating movement of the second cylindrical block 18. This causes the second piston body 32 to rise and fall within the second cylinder 4. This causes repeated suction, compression (pressurization), and discharge of a fluid (air, refrigerant, etc.) within the second cylinder 4. Discharge occurs via a discharge port (not shown).

[0053] Since the drive unit 1 is equipped with two pistons 11 and 12, it can realize a so-called two-stage compression compressor. That is, since the diameter of the second piston body 32 is larger than the diameter of the first piston body 28, for example, the larger-diameter second piston body 32 is used to perform a first compression operation and pressurize the air to approximately the desired pressure. After this, the smaller-diameter first piston body 28 is used to perform a second compression operation. This allows the pressurization state of the drive unit 1 to be adjusted.

[0054] <Guide unit action> Next, the operation of the guide unit 13 will be described in detail with reference to FIGS. As shown in Fig. 8, the linear motion of each slider 8, 9 is achieved by converting the rotational motion of the crankshaft 6 and each cylindrical block 17, 18 into linear motion by the guide unit 13. Therefore, a rotational torque is applied from the sliders 8, 9 to the guide 43 of each guide unit 13 (see arrows T1, T2 in Fig. 8). In particular, at a specific rotational phase of the crankshaft 6, a large rotational torque is applied from the sliders 8, 9 corresponding to the guide 43.

[0055] At this time, the leaf spring 42 is elastically deformed, and the guide 43 tilts to follow the behavior of the corresponding sliders 8, 9. In other words, the leaf spring 42 allows the guide 43 to tilt with respect to the housing 2. The leaf spring 42 absorbs the rotational torque applied from the sliders 8, 9. As a result, the rotational torque applied to the guide 43 from the sliders 8, 9 is prevented from changing significantly depending on the rotational phase of the crankshaft 6.

[0056] 9 is a graph showing changes in the rotational torque [Nm] applied to the guide 43 from the sliders 8, 9, when the vertical axis represents the rotational torque [Nm] applied to the guide 43 from the sliders 8, 9, and the horizontal axis represents the rotational phase [deg] of the crankshaft 6. In FIG. 9, a comparison is made between a case where the guide unit 13 of this embodiment is provided and a case where the guide unit 13 is not provided (conventional). As shown in FIG. 9, it can be confirmed that the change in rotational torque can be suppressed in this embodiment.

[0057] As described above, the drive device 1 includes the guide unit 13. The guide unit 13 includes the leaf spring 42 fixed to the housing 2 (fixed plate 41) and the guide 43 connected to the leaf spring 42. Therefore, when the rotational torque of the crankshaft 6 is applied to each of the sliders 8, 9, the guides 43 can be tilted to follow the behavior of each of the sliders 8, 9. As a result, it is possible to prevent the rotational torque from each of the sliders 8, 9 applied to each of the guides 43 from changing significantly depending on the rotational phase of the crankshaft 6. Therefore, in the drive device 1 including the oscillating linear drive mechanism, vibration and noise during driving can be reduced.

[0058] The leaf spring 42 allows the guide 43 to tilt in the rotational direction about the X-direction, that is, in the direction around the rotational axis of the crankshaft 6 (around the main rotational axis Am). By actively restricting the tilt direction of the guide 43 to a desired direction in this way, it is possible to stably tilt each guide 43 in the direction in which the rotational torque from each slider 8, 9 is applied. This reliably prevents the rotational torque from each slider 8, 9 applied to the guide 43 from changing significantly depending on the rotational phase of the crankshaft 6. As a result, it is possible to reliably reduce vibration and noise when the drive unit 1 is driven.

[0059] The leaf spring 42 is used as an elastic member for tilting the guide 43. Therefore, the tilting of the guide 43 due to the rotational torque from each of the sliders 8 and 9 can be realized with a simple structure. The leaf spring 42 is formed by integrally molding a base portion 44 disposed on the fixed plate 41 and a pair of legs 45 extending from both sides in the Y direction of the base portion 44. With this configuration, the leaf spring 42 can stably tilt each guide 43 in the direction in which the rotational torque from each slider 8, 9 is applied.

[0060] In the leaf spring 42, the width of the leg portions 45 in the X direction is approximately the same as the width of the tip of the tapered portion 46 of the base portion 44. In other words, the width of the leg portions 45 in the X direction is smaller than the width of the base portion 44 in the X direction. With this configuration, the rigidity of the leg portions 45 can be made lower than the rigidity of the base portion 44. This makes it easier for the leg portions 45 to elastically deform than the base portion 44. Meanwhile, the highly rigid base portion 44 allows the leaf spring 42 to be reliably supported by the housing 2.

[0061] The thickness T1 of the connection portion 59 between the base portion 44 and the leg portion 45 is thinner than the thickness T2 of the base portion 44. This makes it easier to elastically deform the leg portion 45. This makes it easier to tilt the guide 43 in the direction in which the rotational torque from each slider 8, 9 is applied. A tapered portion 46 is formed at each end of the base portion 44 in the Y direction. The tapered portion 46 is tapered so that the width in the X direction gradually decreases toward the tip, which is located on the outer side in the Y direction. This makes it easier to reduce the rigidity of the leg portion 45. This makes it easier for the leg portion 45 to elastically deform.

[0062] A leaf spring-side fixing portion 49 is integrally formed with each of the pair of leg portions 45 at their outer ends in the Y direction. A guide-side fixing portion 50 is provided at the outer end of the guide 43 in the Y direction. These fixing portions 49, 50 are connected via a support shaft 55. This allows the leaf spring 42 to tilt in the direction around the rotational axis of the crankshaft 6 (around the main rotational axis Am). Therefore, the guide 43 and the leaf spring 42 can be integrated via the fixing portions 49, 50. Furthermore, with this simple structure, each guide 43 can be stably tilted in the direction in which the rotational torque from each slider 8, 9 is applied (around the main rotational axis Am).

[0063] The present invention is not limited to the above-described embodiment, and includes various modifications to the above-described embodiment without departing from the spirit of the present invention.

[0064] For example, in the above embodiment, the guide unit 13 is described as including the leaf spring 42 as an elastic member that supports the guide 43. However, this is not limited to this, and various elastic members can be used. For example, rubber or the like may be used instead of the leaf spring 42. Preferably, the elastic member is configured to allow tilt of the guide 43 in a direction around the main rotation axis Am.

[0065] In the above embodiment, a case has been described in which leaf spring-side fixing portions 49 are integrally formed with the outer ends of the pair of legs 45 in the Y direction. A case has been described in which a guide-side fixing portion 50 is provided at the outer end of the guide 43 in the Y direction. A case has been described in which these fixing portions 49, 50 are connected via a support shaft 55. As a result, the leaf spring 42 is allowed to tilt in the guide 43 around the rotation axis of the crankshaft 6 (around the main rotation axis Am). However, this is not a limitation, and each fixing portion 49, 50 may be configured to allow tilt of the guide 43 around the main rotation axis Am.

[0066] Among the embodiments disclosed in this specification, those that are comprised of multiple objects may be integrated, and conversely, those that are comprised of a single object may be separated into multiple objects. Regardless of whether they are integrated, it is sufficient that they are configured to achieve the object of the invention. [Explanation of symbols]

[0067] 1...Driver 2. Housing 5...Drive mechanism 6...Crankshaft 8...First slider (slider) 8z...Z side (flat surface on the slider side) 9...Second slider (slider) 9y...Y side (flat surface on the slider side) 11...First piston (moving body) 12...Second piston (moving body) 14...First main shaft (main shaft) 15...Second main shaft (main shaft) 16...Eccentric shaft 17...First cylindrical block (cylindrical block) 18...Second cylindrical block (cylindrical block) 42...Leaf spring (elastic member) 43... Guide 43a... Surface (flat surface on the guide side) 44...Base 45...legs 49...Leaf spring side fixing part (fixing part) 49a... Leaf spring side insertion hole 50... Guide side fixed part (fixed part) 54...Guide side insertion hole (insertion hole) 55...Spindle 59...Connection Am...Main rotation axis (first rotation axis) Ae...Eccentric rotation axis (second rotation axis)

Claims

1. The housing and a crankshaft rotatably supported by the housing; a cylindrical block rotatably supported by the crankshaft; a slider and a moving body rotatably supported on the cylindrical block; a guide supported on the housing via an elastic member and configured to restrict movement of the slider to linear movement in one direction; Equipped with The crankshaft is a main shaft supported by the housing so as to be rotatable about a first rotation axis; an eccentric shaft having a second rotation axis that is eccentric with respect to the first rotation axis; Equipped with the cylindrical block rotates around the first rotation axis and is rotatably supported by the eccentric shaft on the second rotation axis, the slider has a pair of slider-side flat surfaces that are arranged opposite to each other with the first rotation axis as the center, the slider-side flat surface extends along the one direction, the guide has a pair of guide-side flat surfaces that contact the slider-side flat surfaces, the guide-side flat surface extends along the slider-side flat surface, The elastic member allows the guide to tilt relative to the housing. Drive unit.

2. the elastic member allows the guide to tilt in a direction around the first rotation axis; The drive device according to claim 1 .

3. The elastic member includes a leaf spring. The drive device according to claim 1 .

4. The elastic member is a base portion fixed to the housing; a pair of legs extending from both sides of the base portion in the one direction; and Both end sides of the base portion in the one direction extend so as to be gradually spaced apart from the housing toward the ends, The pair of legs extend so as to gradually move away from the housing as they move away from the base portion. The drive device according to claim 3 .

5. a width of the leg portion in a thickness direction and a direction perpendicular to the one direction being narrower than a width of the base ... leg portion in a thickness direction and a direction perpendicular to the one direction being narrower than a width of the base portion in a thickness direction and a direction perpendicular to the one The drive device according to claim 4.

6. The thickness of the connection portion between the base portion and the leg portion is thinner than the thickness of the base portion. The drive device according to claim 5.

7. The ends of the base portion are formed so that the width gradually narrows toward the ends. The drive device according to claim 6.

8. the leg and the guide have fixing portions for fixing each other; the fixing portion allows the guide to tilt relative to the leg portion in a direction around the first rotation axis; The drive device according to any one of claims 4 to 7.

9. The fixing portion is an insertion hole formed in the guide and extending in a direction perpendicular to the one direction; a support shaft provided on the leg portion and inserted into the insertion hole; Including, The drive device according to claim 8.

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