JP2016079816A - Cylinder device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder device improving assemblability of a case body, hard to reflect a processing error of a component to an assembly error, and reducing its costs.SOLUTION: A case body 1 is characterized such that in a housing structure 5 in which a pair of plate-like housing members 2, 2 are assembled so as to be opposite to each other in an axial direction through a plurality of support columns 4, side wall members 6 integrally holding a cylinder 7 so as to make the cylinder orthogonal to the side wall surface are respectively assembled into the side surfaces of the pair of plate-like housing members 2, 2 with the support columns 4 as a guide.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a cylinder device that can mutually convert a rotational motion of a shaft and a linear reciprocating motion of a piston in a cylinder, and more specifically to a cylinder device that can be applied to various drive devices such as a compressor and a vacuum pump.

  The applicant of the present application reduces as much as possible the mechanical loss of the piston assembly that is reciprocally mounted in an eccentric cam that is linked to the first crankshaft that rotates about the shaft and that linearly reciprocates in the cylinder. By doing so, we proposed a small rotary cylinder device that realized energy saving.

  Specifically, the first crankshaft rotates around the shaft, and the eccentric cam rotates relative to the first crankshaft so that the eccentric cam intersects the eccentric cam and is assembled to be relatively rotatable. A plurality of piston groups perform linear reciprocating motion along the radial direction (trajectory of the inner cycloid) of a rolling circle having a radius 2r of the second virtual crankshaft centered on the shaft (see Patent Document 1). Thereby, the mechanical loss of each piston group can be reduced as much as possible, and energy saving can be realized.

  In the cylinder device, the shaft (input / output shaft) is rotatably supported by the main body case. In the main body case, first and second balance weights inserted and assembled at both ends of the first crankshaft, an eccentric cam relatively rotatable around the first crankshaft, and the eccentric cam assembled through a bearing A first piston set and a second piston set are accommodated. The main body case is divided into a first main body case and a second main body case in the axial direction. The cylinder is sandwiched between the first and second body cases and assembled to the side surface. The first body case and the second body case are assembled together by screwing four corners with bolts.

Japanese Patent No. 4553976

In the rotary cylinder device of Patent Document 1 described above, since the main body case is divided into the first main body case and the second main body case in the axial direction, if an error occurs in processing accuracy, a step is formed at the divided joint portion. May occur. In order to prevent this, it is necessary to perform simultaneous processing by aligning die cast parts corresponding to the first main body case and the second main body case, which increases the processing cost.
In addition, since the cylinder in which the piston assembly reciprocates is assembled to the opposite side surface in the main body case, there is a risk that the expected performance cannot be exhibited due to a decrease in assembly accuracy. In the main body case, first and second balance weights inserted and assembled at both ends of the first crankshaft, an eccentric cam relatively rotatable about the first crankshaft, and a first cam assembled through a bearing to the eccentric cam Since the one piston group and the second piston group are accommodated, it takes time to align these and the cylinder and between the cylinder and the main body case, and there is a possibility that the assemblability may be reduced.
Furthermore, if all component parts are assembled exclusively using die-cast parts, assembly errors due to processing errors may result in quality and performance degradation, and manufacturing costs may increase.

  An object of the present invention is to provide a cylinder device that improves the assemblability of a case body and reduces costs because a machining error of parts is not easily reflected in an assembly error.

In order to achieve the above object, the present invention has the following configuration.
The shaft is housed in a case body that rotatably supports the shaft, and when the crankshaft rotates about the shaft, the eccentric cam relatively rotates about the crankshaft and is assembled to intersect the eccentric cam. A cylinder device that performs linear reciprocating motion in a cylinder along a trajectory of an inner cycloid while the plurality of piston groups rotate relatively, wherein the case body is a pair that rotatably supports the shaft. A side wall member that integrally holds the cylinder so as to be orthogonal to the side wall surface is mounted on the housing structure in which the plate-shaped housing members are assembled to face each other in the axial direction via a plurality of columns. Each of the plate-like housing members is assembled to each side surface.

Since the case body has a housing structure in which a pair of plate-like housing members are assembled to face each other in the axial direction via a support column, processing errors between components constituting the case body are affected by assembly accuracy. It is difficult, and the side wall members that integrally hold the cylinder so as to be orthogonal to the side wall surfaces are each assembled to the side surfaces of the pair of plate-like housing members using the support as a guide, so that the assembly accuracy of the cylinder with respect to the piston assembly can be maintained.
Further, the shaft is rotatably supported on the housing structure, the crankshaft is centered on the shaft, the eccentric cam is relatively rotated about the crankshaft, and the eccentric cam is assembled so as to be relatively rotatable. Since the side wall members that hold the cylinder in a state where the plurality of piston groups are positioned are assembled from the side, the assembly of the case body is good.

  The screw holes formed at the four corners on the opposing surface side of the pair of rectangular plate-shaped housing members are respectively abutted so that the screw holes formed on the end surfaces of the support columns communicate with each other, and from the opposite surface side of each housing member It is preferable that a bolt is screwed into the communicating screw hole and assembled. As a result, each column is screwed to stand between the pair of rectangular plate-shaped housing members so as to stand on the opposite surface, so that the columns are assembled while maintaining the parallelism between the columns and the orthogonality between the columns and the plate-shaped housing member. It is done. Therefore, a piston unit that is assembled to the housing structure around the shaft (a crankshaft, an eccentric cam that rotates relative to the crankshaft, and a plurality of piston sets that are assembled so as to be able to rotate relative to the eccentric cam. ) Can be positioned with high accuracy, and the side wall member that holds the cylinder in this state can be assembled with the support posts on both sides as guides.

The cylinder head portion that closes the opening of each cylinder assembled integrally with the side wall member is abutted against the side surfaces of the pair of plate-like housing members by overlapping the mold member and the press-formed metal head plate. It is preferable that each has a hybrid structure to be assembled.
Since the parallelism between the side wall member that holds the cylinder so as to be orthogonal to the side wall surface and the side surface of the plate-like housing member is maintained in this way, the cylinder head portion is orthogonal to the cylinder axis. Can be assembled with high precision.
Compared to the case where all the components are assembled exclusively using die-cast parts, the assembly error caused by parts processing error does not deteriorate the quality and performance, and the manufacturing cost is reduced, making it suitable for mass production. Can be structured.

In the case body, the crankshaft, a first balance weight in which one end portion of the crankshaft is inserted and assembled, and a second balance weight in which the second shaft and the other end portion of the crankshaft are inserted and assembled. And a piston unit including the eccentric cam that is assembled to be relatively rotatable about the crankshaft, and first and second piston groups that are assembled to be relatively rotatable so as to intersect the eccentric cam. May be.
As a result, it is possible to provide a cylinder device suitable for mass production with low vibration and low cost by accurately assembling the components of the piston unit around the shaft in the case body.

  By using the cylinder device according to the present invention, it is possible to provide a cylinder device that improves the assembling property of the case body, and that the machining error of parts is hardly reflected in the assembling error, thereby reducing the cost.

It is a perspective view of a cylinder device. It is a disassembled perspective view of a case body. It is a perspective view of the piston unit centering on the shaft accommodated in the case body of a cylinder apparatus. It is a disassembled perspective view of the shaft and balance weight of FIG. It is a disassembled perspective view of the piston unit of FIG. It is the disassembled perspective view which removed the housing member and the side wall member from the case body of the cylinder apparatus of FIG. It is a disassembled perspective view of the state which removed the side wall member from the case body of the cylinder apparatus of FIG.

  Hereinafter, an embodiment for carrying out the invention will be described in detail with reference to the accompanying drawings. First, a cylinder device used as a pump for a compressor, an oxygen concentrator or the like will be mainly described with reference to FIGS. The cylinder device is assumed to be a device in which the linear reciprocating motion of the piston relative to the cylinder and the rotational motion of the shaft are mutually converted and output.

  In the following description, the virtual crank arm refers to a portion that connects between the shaft and the axis of the crankshaft, and refers to a component that can be structurally recognized even if there is no crank arm as a single component. The virtual crankshaft is a crankshaft in which the existence of an axis serving as the center of rotation is virtually recognized even when no crankshaft on the mechanism is present. Further, the piston assembly means that a seal member such as a seal cup, a seal cup pressing member, and a piston ring is integrally assembled to a piston head portion of a single piston.

  In FIG. 1, a case body 1 has a cylinder 7 mounted on a housing structure 5 (see FIG. 7) in which a pair of plate-like housing members 2, 2 are assembled to face each other in the axial direction by support columns 4 (see FIG. 2). The side wall member 6 to hold | maintain is each assembled | attached to the side surface of the plate-shaped housing members 2 and 2 by using the support | pillar 4 as a guide. Two sets of discharge pipe joints 2g and suction pipe joints 2h are connected to the side surfaces of the pair of plate-like housing members 2 and 2, respectively.

  Specifically, as shown in FIG. 2, screws formed on both end surfaces 4 a of the four columns 4 in the screw holes 2 a provided at the four corners on the opposite surface side of the pair of rectangular plate-like housing members 2, 2. The holes 4b are abutted so as to communicate with each other, and the fixing bolts 8 are respectively screwed into the screw holes 2a and 4b communicating from the opposite surfaces of the housing members 2 and 2, respectively. The fixing bolt 8 is screwed into the screw holes 2a and 4b which are in contact with the opposite surfaces (outside) of the housing members 2 and 2 with the support posts 4 abutted against the opposing surfaces of the pair of rectangular plate-like housing members 2 and 2, respectively. Can be assembled and assembled. As a result, a housing structure 5 is formed in which the pair of plate-like housing members 2 and 2 are assembled to face each other in the axial direction via the support columns 4 (see FIG. 7).

  As shown in FIG. 2, aluminum casting parts are used for the pair of plate-like housing members 2 and 2. Through holes 2b and 2b through which the shafts 10a and 10b (see FIG. 3) are inserted are formed in the center portions of the pair of plate-like housing members 2 and 2, respectively. Bearings 11 (ball bearings) that rotatably support shafts 10a and 10b (see FIG. 3) are assembled around the through holes 2b and 2b, respectively. In addition, space portions 2c and 2c are formed on opposite surfaces of the pair of plate-like housing members 2 and 2 so as to form a fluid (for example, air) suction passage or discharge passage. The materials (O-rings) 2d and 2d are fitted. The space portions 2c and 2c are overlapped with the closing plates 12 and fixed with screws 13 to form a sealed space. This sealed space communicates with each cylinder chamber and is used as a fluid discharge passage or a suction passage.

  In FIG. 2, for example, a press-molded sheet metal is used for the side wall member 6. A cylinder insertion hole 6 a is formed at the center of the side wall member 6. The cylinder 7 is press-fitted into the cylinder insertion hole 6a and assembled together. The cylinder 7 is formed in a cylindrical shape by an extruded material made of aluminum, for example. The stepped portion 7a is formed so that the outer diameter of the cylinder 7 at the opening end side (case body outer side) is larger than the outer diameter of the insertion side (case body inner side). The cylinder 7 is assembled and held integrally with the side wall member 6 by press-fitting the stepped portion 7 a until it abuts against the outer surface of the side wall member 6. An annular sealing material (O-ring) 7 b is fitted into a step portion formed on the outer periphery of the opening end of the cylinder 7. The cylinder opening is closed by assembling a cylinder head portion 15 to be described later. The side wall member 6 aligns the screw holes 6b provided on the upper and lower sides with the screw holes 2e and 2e formed on the side surfaces of the pair of plate-like housing members 2 and 2, and screws them into the communicating screw holes 6b and 2e. 14 is screwed and assembled together.

  6 and 7, the cylinder head portion 15 for closing each cylinder 7 assembled to the side wall member 6 has a hybrid structure in which the mold member 15a and the head plate 15b are overlapped and assembled to the side wall member 6. . For the mold member 15a, for example, a PPS (polyphenylene sulfide) resin material mixed with a filler such as glass fiber is used. This PPS resin material is excellent in heat resistance and high-temperature characteristics, has high mechanical strength equivalent to that of an aluminum cast product, and is excellent in chemical resistance and dimensional stability. The head plate 15b is made of, for example, a press-molded sheet metal. The mold member 15a is provided with a suction port 15c and a discharge port 15d communicating with the cylinder chamber. The suction port 15c is opened and closed by a suction side reed valve 15e. The discharge port 15d is opened and closed by a discharge side reed valve 15f. Further, between the mold member 15a and the head plate 15b, an annular sealing material 15g for sealing the suction side flow path and the discharge side flow path is provided. Cylindrical bosses are formed at the four corners of the mold member 15, and screw holes 15h are provided in the bosses. Screw holes 15i are also provided at the four corners of the head plate 15b. The mold member 15a and the head plate 15b are overlapped so that the screw holes 15h and 15i communicate with each other, and are aligned with the screw holes 2f and 2f formed on the side surfaces of the pair of plate-like housing members 2, respectively. The cylinder head 15 is assembled to the housing structure 5 integrally by screwing the fixing screws 15j into the four places from the outside of the plate 15b (see FIG. 1).

  As shown in FIG. 7, a piston unit 16 is accommodated in the case body 1. 3, the piston unit 16 includes a crankshaft 17, a first balance weight 18 into which one end of the first shaft 10a and the crankshaft 17 is inserted and assembled, and a second shaft 10b and the other end of the crankshaft 17 are inserted. A second balance weight 19 to be assembled, an eccentric cam 20 assembled to be relatively rotatable around the crankshaft 17, and first and second piston groups assembled to be relatively rotatable across the eccentric cam 20. 21 and 22 are included.

  As shown in FIG. 4, the shaft is divided into a first shaft 10a and a second shaft 10b. The first shaft 10 a is fitted into the fitting hole 18 a of the first balance weight 18 through the spacer 23. One end of the crankshaft 17 is fitted into the fitting hole 18 a of the first balance weight 18 via the spacer 24. When the first shaft 10a and the crankshaft 17 are inserted into the fitting hole 18a, the first cut shaft 10a and the crankshaft 17 are fitted in a state where the D-cut surfaces 10c and 17a are in contact with each other. The one shaft 10a, the crankshaft 17 and the first balance weight 18 are assembled together.

  The second shaft 10 b is fitted into the fitting hole 19 a of the second balance weight 19 through the spacer 23. The other end of the crankshaft 17 is fitted into the fitting hole 19 a of the second balance weight 19 via the spacer 24. When the second shaft 10b and the crankshaft 17 are inserted into the fitting hole 19a, the second shaft 10b and the crankshaft 17 are fitted in a state where the D-cut surfaces 10d and 17a are in contact with each other, are prevented from coming off by the retaining pins 25, and are fastened by the fastening bolts 26. The two shafts 10b, the crankshaft 17 and the second balance weight 19 are assembled together. The spacers 23 and 24 are provided to position the piston unit 16 in the axial direction in the case body 1. As shown in FIG. 6, the first shaft 10 a and the second shaft 10 b are rotatably supported by the plate-like housing members 2 and 2 via a bearing 11.

  In FIG. 3, first and second balance weights 18 and 19 inserted and assembled at both shaft ends of the crankshaft 17 are provided to balance the mass between rotating parts assembled to the piston unit 16. It has been. The first and second balance weights 18 and 19 may be formed integrally with the first shaft 10a and the second shaft 10b.

  Further, as shown in FIG. 5, a cylindrical eccentric cam 20 is assembled around the crankshaft 17 so as to be relatively rotatable via bearings 27 and 27. As will be described later, a first piston set 21 and a second piston set 22 are assembled to the eccentric cam 20 so as to be rotatable relative to each other via bearings 28 and 28.

  The eccentric cam 20 includes a cylindrical hole 20a through which the crankshaft 17 serving as a rotation center is inserted, and cylindrical bodies 20b and 20b that are eccentric with respect to the cylindrical hole 20a. . The axial centers of the pair of cylinders 20b and 20b coincide with the virtual crankshaft. The eccentric cam 20 is made of, for example, a stainless steel metal material, and is integrally formed by MIM (metal injection mold). In addition, bearings 28 and 28 are assembled on the outer circumferences of the pair of cylinders 20b and 20b, respectively. The first and second piston sets 21 and 22 are assembled so as to be rotatable relative to the eccentric cam 20 via the bearings 28 and 28 while crossing each other.

  Further, as shown in FIG. 5, in the first and second piston sets 21, 22, piston head portions 21b, 22b are formed upright at both longitudinal ends of the piston bodies 21a, 22a. Ring-shaped seal cups 21c and 22c and seal cup pressing members 21d and 22d are integrally assembled to the piston head portions 21b and 22b by bolts 29, respectively. The seal cups 21c and 22c are made of an oil-free sealing material (for example, a fluorine resin material (polytetrafluoroethylene), a PEEK (polyether ether ketone) resin material, or the like). A metal material (aluminum material) is used for the piston bodies 21a and 22a, and it is preferable that the piston bodies 21a and 22a be subjected to surface treatment (anodized film formation) in order to improve corrosion resistance. The piston head portions 21b and 22b slide while maintaining sealing properties with the inner wall surface of the cylinder 7 (see FIG. 6) via seal cups 21c and 22c covering the outer peripheral surface.

Here, an example of the assembly configuration of the cylinder device will be described with reference to FIGS. 2 and 4 to 7. The pair of plate-like housing members 2, the four side wall members 6, and the cylinder head portion 15 have a common configuration, and a part of the exploded view is omitted.
As shown in FIG. 5, the crankshaft 17 is fitted through bearings 27, 27 that are press-fitted into the cylindrical hole 20 a of the eccentric cam 20, so that the eccentric cam 20 is relatively rotatable around the crankshaft 17. Assembled. Further, bearings 28 and 28 are fitted on the outer peripheral surface of the cylindrical body 20b provided on both longitudinal sides of the eccentric cam 20, and the first and second piston sets 21 and 22 intersect with each other via the bearings 28 and 28. It is assembled as it is. Seal cups 21c, 22c and seal cup pressing members 21d, 22d are integrally assembled by bolts 29 to piston head portions 21b, 22b provided at both ends of the piston bodies 21a, 22a.

  Further, in FIG. 4, both end portions of the crankshaft 17 are fitted into the fitting holes 18 a and 19 a of the first and second balance weights 18 and 19 through the spacer 24. The first shaft 10a and the second shaft 10b are fitted to the first and second balance weights 18 and 19 via the spacer 23, and the D-cut surfaces 10c and 17a and the D-cut surfaces 10d and 17a of the crankshaft 17 are fitted into the fitting holes 18a and 19a. Fit each other so that they overlap. Then, the retaining pins 25 are fitted into the first and second balance weights 18 and 19, respectively, and the fastening bolts 26 are respectively screwed into the screw holes and assembled together. As a result, the piston unit 16 (see FIG. 3) is assembled.

Further, as shown in FIG. 2, the bearing 11 is assembled in the through holes 2 b and 2 b of the pair of plate-like housing members 2 and 2, the annular sealing material 2 d is attached, and the closing plates 12 and 12 are fixed with screws 13.
Then, as shown in FIG. 6, the piston unit 16 is fitted to one plate-like housing member 2, for example, the second shaft 10b is fitted to the bearing 11, and the fixing bolts are fixed to the screw holes 2a and 4b communicating with the pillars 4 at the four corners. 8 is screwed and assembled in an upright position. Further, the other plate-shaped housing member 2 is placed with the first shaft 10a fitted to the bearing 11 and positioned on the support column 4, and the fixing bolt 8 is screwed into the communicating screw holes 2a and 4b to be housed. The piston unit 16 is assembled to the structure 5 (see FIG. 7).

Then, as shown in FIG. 7, the side wall member 6 in which the cylinder 7 is press-fitted into the cylinder insertion hole 6 a is assembled to the side surfaces of the pair of plate-like housing members 2, 2 using the columns 4 as both-side guides. The cylinder 7 and the first and second piston sets 21 and 22 can be aligned by turning the first shaft 10a or the second shaft 10b. An annular sealing material 7 b is attached to the open end of each cylinder 7.
Further, the mold member 15a assembled with the suction side reed valve 15e, the discharge side reed valve 15f, and the annular seal material 15g is overlapped on the cylinder 7. Further, the head plate 15b is overlaid on the mold member 15a, and the screw holes 15h and 15i formed on these are aligned with the screw holes 2f formed on the side surfaces of the pair of plate-like housing members 2, respectively. The cylinder head 15 is assembled to the housing structure 5 integrally by screwing the fixing screws 15j into four places from the outside of 15b. The cylinder head 15 is assembled with respect to the housing structure 5 so as to surround four surfaces. Thereby, the piston unit 16 is accommodated in the case body 1 (refer FIG. 1).

  The cylinder device assembled as described above includes the first static balance around the virtual crankshaft of the first and second piston sets 21 and 22, the eccentric cam 20 and the first and second piston sets 21 and 22. A second static balance centered on the crankshaft 17 and a third static balance centered on the crankshaft 17, the eccentric cam 20, and the first and second shafts 10a, 10b of the first and second piston sets 21, 22. Is balanced and assembled only by the first and second balance weights 18 and 19.

  With the above configuration, the rotation radius r of the crankshaft relative to the shafts 10a and 10b and the length of the virtual crank arm connecting the crankshaft 17 and the virtual crankshaft (not shown) are set to be the rotation radius r of the cylindrical body 20b. By doing so, the eccentric cam 20 and the first and second piston sets 21 and 22 can be assembled compactly in the axial direction and the radial direction around the crankshaft 17. Thus, the crankshaft 17 is rotated by the rotation of the shafts 10 and 10b, the eccentric cam 20 is relatively rotated about the crankshaft 17 through the bearings 27 and 27, and the first piston set 21 and the second piston set 22 are While reciprocally rotating through the bearings 28, 28, the cylinders 7 are linearly reciprocated in the orthogonally arranged cylinders 7 according to the inner cycloid principle.

As described above, the case body 1 includes the housing structure 5 in which the pair of plate-like housing members 2 and 2 are assembled to face each other in the axial direction via the plurality of support columns 4. The side wall member 7 that integrally holds the cylinder 7 so as to be orthogonal to the side wall surface is hardly affected by the assembly accuracy, and the side surfaces of the pair of plate-like housing members 2, 2 are guided by the column 4. Therefore, the assembly accuracy of the cylinder 7 with respect to the first and second piston assemblies 21 and 22 can be maintained.
Further, the housing structure 5 can be rotated relative to the piston unit 16 (the crankshaft 17, the eccentric cam 20 that rotates relative to the crankshaft 17, and the eccentric cam 20 around the shafts 10 a and 10 b). Since the side wall members 6 that hold the cylinder 7 in a state where the plurality of piston sets 21 and 22) to be assembled are positioned are assembled from the side, the assembly workability of the case body 1 is good.

  Further, each column 4 is screwed between the pair of rectangular plate-like housing members 2 and 2 so as to stand upright on the opposing surface, so that the parallelism between the columns 4 and the orthogonality between the column 4 and the plate-like housing member 2 are obtained. Can be assembled while maintaining the degree. Therefore, it is possible to accurately position the piston unit 16 assembled with the shafts 10a and 10b as the center with respect to the housing structure 5, and in this state, the side wall member 6 holding the cylinder 7 is positioned with the columns 4 on both sides as guides. Can be assembled with high accuracy.

  The cylinder head portion 15 for closing the opening of each cylinder 7 assembled integrally with the side wall member 6 has a hybrid structure in which a mold member 15a and a press-formed metal head plate 15b are overlapped. Therefore, compared to the case where all the component parts are assembled exclusively using die-cast parts, the assembly error caused by the part processing error does not deteriorate the quality and performance, and the manufacturing cost is reduced, making it suitable for mass production. Can be structured.

  The cylinder device is not limited to a pump that sucks and feeds gas (air or the like), and may be used as a pump for other fluids (liquid or the like). The number of cylinders and piston groups is not limited to two, and can be further increased.

  DESCRIPTION OF SYMBOLS 1 Case body 2 Plate-shaped housing member 2a, 2e, 2f, 4b, 6b, 15h, 15i Screw hole 2b Through-hole 2c Space part 2d, 7b, 15g Annular seal material 2g Discharge pipe joint 2h Suction pipe joint 4 Strut 4a End face 5 Housing structure 6 Side wall member 6a Cylinder insertion hole 7 Cylinder 7a Step part 8 Fixing bolt 10 Shaft 10a First shaft 10b Second shaft 10c, 10d, 17a D cut surface 11, 27, 28 Bearing 12 Closing plate 13, 14 Screw 15 Cylinder head portion 15a Mold member 15b Head plate 15c Suction port 15d Discharge port 15e Suction side reed valve 15f Discharge side reed valve 15j Fixing screw 16 Piston unit 17 Crankshaft 18 First balance weight 18a, 19a Fitting hole 19 Second balance weight 20 Eccentric cam 20a Cylinder hole 20b Cylinder 21 First piston assembly 21a, 22a Piston body 21b, 22b Piston head part 21c, 22c Seal cup 21d, 22d Seal cup holding member 22 Two piston assembly 23, 24 Spacer 25 Retaining pin 26 Fastening bolt 29 Bolt

Claims (4)

The shaft is housed in a case body that rotatably supports the shaft, and when the crankshaft rotates about the shaft, the eccentric cam relatively rotates about the crankshaft and is assembled to intersect the eccentric cam. A cylinder device that performs a linear reciprocating motion in a cylinder along a trajectory of an inner cycloid while the plurality of piston sets rotate relatively,
The case body has a housing structure in which a pair of plate-like housing members that rotatably support the shaft are assembled to face each other in the axial direction via a plurality of support columns, and the cylinder is orthogonal to the side wall surface. In this way, the side wall members that are integrally held are assembled to the side surfaces of the pair of plate-like housing members using the support columns as guides.   The screw holes formed at the four corners on the opposing surface side of the pair of rectangular plate-shaped housing members are respectively abutted so that the screw holes formed on the end surfaces of the support columns communicate with each other, and from the opposite surface side of each housing member The cylinder device according to claim 1, wherein the cylinder device is assembled by screwing a fixing bolt into the communicating screw hole.   The cylinder head portion that closes the opening of each cylinder assembled integrally with the side wall member is abutted against the side surfaces of the pair of plate-like housing members by overlapping the mold member and the press-formed metal head plate. The cylinder device according to claim 1, wherein each of the cylinder devices has a hybrid structure to be assembled.   In the case body, the crankshaft, a first balance weight in which one end portion of the crankshaft is inserted and assembled, and a second balance weight in which the second shaft and the other end portion of the crankshaft are inserted and assembled. And a piston unit including the eccentric cam that is assembled to be relatively rotatable about the crankshaft, and first and second piston groups that are assembled to be relatively rotatable so as to intersect the eccentric cam. The cylinder device according to any one of claims 1 to 3, wherein:

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