JP2008190366A - Device for driving a plurality of movable bodies at predetermined phase difference - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device capable of uniformly imparting stable operations to a plurality of movable bodies at a predetermined phase difference with a small number of parts, capable of having a driving device of each of the movable bodies on an outer side than the vicinity of an arrangement center, and capable of using the arrangement center as a various operation space. <P>SOLUTION: The driving device is provided with a cylinder 140 as a plurality of fixed bodies arranged on a base 110, and a piston 142 as the movable body reciprocating in the cylinder, and drives the movable bodies at the prescribed phase difference. The driving device is further provided with a cross plate 130 as a first member wherein movement in a rotation direction is regulated with respect to the base and movement to a first predetermined direction is permitted, and a driving plate 120 as a second member wherein movement in the rotation direction is regulated by engagement with the first member and movement to a second direction perpendicular to the first direction is permitted, and the movable body is engaged with the driving plate 120 and driven. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention is applied to a so-called star array cylinder device in which a plurality of cylinders are radially arranged from the center of the array, such as an internal combustion engine, a hydraulic pump, a Stirling engine, etc., and drives a plurality of movable bodies with a predetermined phase difference. The present invention relates to a driving device.

  Conventionally, there is a drive device that drives a plurality of movable bodies with a predetermined phase difference for the purpose of suppressing load fluctuations, for example, an aircraft engine such as a piston drive device of a star-shaped array cylinder, and a plunger drive device of an oil pump. Many attempts have been made at the beginning. Various means have been invented as means for this.

As shown in Patent Document 1 and FIG. 5, a main connecting rod 53 for connecting a crank and a piston and a plurality of connecting rods 52 coupled thereto are used.

As shown in Patent Document 2, a piston reciprocating motion is obtained by an eccentric annular cam member provided on a main shaft.

  As shown in Patent Document 3 and FIG. 6, the connecting rod 61 is driven by a translation member 62 supported by links 63a, 63b, 63c.

  As shown in Patent Document 4, a crank drive device is provided at each cylinder end, and this is driven outside the center of the array by a chain or the like from a drive shaft.

In addition, a Stirling engine shown in Reference 5 is proposed in which waste heat is used by arranging the center of the array as a waste heat flow path and surrounding the periphery with a displacer piston extending in the direction of the array center axis. ing.
Tokumei 39118 Japanese Patent Publication No. 32-002423 Tokumei 87474 JP 59-077001 JP 2004-108241 A

  However, all of the above-mentioned conventional techniques have a large number of parts, and it is necessary to dispose a drive device near the center of the arrangement. It has been difficult to use as a check valve and an oil flow path in a pump, and as a high-temperature exhaust heat gas flow path in an exhaust heat utilization Stirling engine.

  Further, in the structure shown in Patent Document 1 and FIG. 5, the movement of the connecting portion 52a of each connecting rod 52 cannot be strictly uniform as shown by the arrows A, B, and C in the figure. Design considerations such as timing and reliability evaluation had to be performed for each cylinder. In particular, it has been very difficult to adopt a linear motion mechanism for suppressing the side pressure of the piston, which will be described later.

For example, in the structure shown in Patent Document 2, the driving point of the piston is arranged on the outer periphery, but the rotational axis of the eccentric cam member itself needs to be at the center of the array. Further, the peripheral speed between the piston and the eccentric cam engaging portion is large, which is not preferable in terms of load and wear.

  Similarly, in the structure shown in Patent Document 4, although the drive device is arranged on the outer periphery, the shaft of the large-diameter flywheel for driving the whole is provided at the center of the array. In addition, various drive devices including a crank need to be provided in the number corresponding to the number of cylinders, which complicates the structure.

Also in Patent Document 5, a crank device or electromagnetic actuator for driving is required for the number of cylinders, and complication of the device is inevitable in increasing the number of cylinders.
Further, an additional mechanism is necessary to suppress the inclination of the displacer piston extending in the direction of the central axis of the array.

  On the other hand, only the structure shown in Patent Document 3 and FIG. 6 is driven by a translational member using a parallel link, thereby obtaining a uniform movement for each piston and a structure that can be driven at a position slightly offset from the center of the array. Has been.

However, when driving with only one set of four-node parallel links, the moment when a pair of opposing links come in a straight line becomes a thought point, and the posture of the translation member 62 cannot be maintained firmly. For this reason, it is difficult from the viewpoint of load balance to provide the drive shaft at a position that is largely deviated by using the center of the array as various working spaces.

In addition, as shown in FIG. 6, a structure in which the translation member is supported by three links is also shown as a structure for eliminating the above-mentioned thought points. In this case, the base, the translation member 62, and the link 63a constituting the four-bar link are shown. 63b, the orientation of the translation member 62 uniquely determined by the links 63b, 63c and the orientation of the translation member 62 determined by the links 63b, 63c must be exactly the same. Therefore, it is difficult to expect stable operation considering expansion due to temperature change.

  The present invention has been made in view of the above points, and provides each movable body with a uniform and stable operation with a predetermined phase difference with a small number of parts, and the drive device for each movable body is removed from the vicinity of the center of the array. It is an object of the present invention to provide a drive device that can be provided in the space and can use the center of the array as various working spaces.

In order to achieve the above object, according to the present invention, for example, in a drive device that includes cylinders arranged radially from the center of the arrangement and drives the corresponding pistons with a predetermined phase difference, the movement in the rotational direction is restricted, and the first A first member that is allowed to move in a predetermined direction, and a movement in a rotational direction that is engaged with the first member is restricted and a movement in a second direction perpendicular to the first direction is performed. And an allowed second member, and each piston is configured to be engaged with and driven by the second member.

Furthermore, the first member may be formed in an annular shape having an opening in the vicinity of the center of the arrangement, and may be configured to be driven by a crank device that engages the second member at a position offset from the opening.

In addition, a plurality of sets of the second members are provided, and a crank device that synchronously drives the plurality of second members is provided, and the displacer pistons extending in the direction of the central axis of the array are provided with the plurality of displacer pistons. It can also be configured to be driven by the second member.

  As described above, according to the present invention, for example, in a device provided with a star-shaped array cylinder, only two members are added regardless of the number of cylinders as necessary parts other than each cylinder and piston. That is, the piston drive device can be configured only by adding the first member and the second member. Moreover, in all cylinders, a uniform movement can be given except for the mutual phase difference regardless of the position and the arrangement angle of each piston.

  As a result, for example, as will be described later in the third embodiment, it is easy to minimize the lateral pressure by adopting a linear motion mechanism using an adduction cycloid or a known approximate linear motion mechanism.

Furthermore, if it comprises like Claim 2, the arrangement | sequence center can be open | released as various working spaces, and various applications including the example described in an Example below are attained.

  According to the third aspect of the present invention, a large number of long displacers extending in the axial direction of the exhaust pipe can be driven in parallel without tilting only by adding one set of the first member and the second member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 4 relate to a first embodiment in which the present invention is applied to a Stirling engine, FIG. 1 is a plan view thereof, FIGS. 2 and 3 are partial sectional views showing height relationships, and FIG. It is a perspective view for clarifying a structure.

On the base 110, three sets of guide rollers 111, a pair of first guide pins 112, and a crank device 150 including a main shaft and an eccentric crank are rotatably supported.

In addition, the base 110 is provided with eight communication pipe portions 113 therein, and the respective ends thereof are contraction side openings for connecting a pair of cylinder blocks 140 arranged at a relative position of 90 degrees to each other, which will be described later. A portion 113a and an expansion side opening 113b are formed.

  The central opening 114 of the base 110 is a space in which a heat source such as combustion gas is arranged, and acts as a heating space facing a heat cap 141 described later. The base 110 is formed of a good heat conductor such as aluminum, If necessary, a cooling water jacket (not shown) is provided on the back surface of the communication pipe portion so that it functions as a heat exchanger for cooling the gas passing through the inside.

A pair of second guide pins 132 are planted in the cross plate 130, and a first guide elongated hole portion 131 is provided so as to be coupled to the first guide pin 112 and its movement in the rotational direction is restricted. Only movement in the X direction shown in the figure is allowed.

A part of the circular opening 123 of the drive plate 120 is engaged with the guide roller 111 to restrict the movement in the height direction, and the second guide slot 121 formed in the drive plate is the second guide hole 121. The movement in the rotational direction is restricted by engaging with the guide pin 132, and the movement in the Y direction is allowed. That is, only translational motion in the XY plane without rotation is allowed for the base 110.

Further, the drive plate 120 is driven by being engaged with the crank device 150, and the drive plate is formed with a drive elongated hole portion 122. The drive plate 120 is engaged with one end of a piston 142 to be described later to drive the piston. The generated power is transmitted to the crank device.

The cylinder block 140 includes a cylinder 143, a piston 142, and a heat cap 141 as a heating heat exchanger. Thus, an expansion space 144 and a contraction space 145 are formed, and the expansion space 144 of one cylinder block is positioned at a relative position of 90 degrees with each other via the expansion side opening 113b, the communication pipe portion 113, and the contraction side opening 113a. It is connected to the contracted space 145 of the next cylinder block arranged.

Next, the operation of the Stirling engine configured as described above will be briefly described.

As described above, the heat cap 141 facing the central opening 114 is heated by a heat source such as combustion gas, while the communication pipe portion 113 and the contraction space 145 are cooled by outside air or cooling water (not shown), and a temperature difference is given to both.

The rotation of the crank device 150 gives the drive plate 120 a translational movement without rotation as described above, and this movement drives each piston through the drive slot 122.

Here, since the drive elongated hole portion 122 is formed at right angles to the operation direction of each piston 142, the piston 142 generates a drive force only in the operation direction due to the movement of the drive plate, and each piston 142 has an arrangement angle difference. Given reciprocating motion with equal phase difference.

For example, the contraction space 145 of the cylinder block denoted by A in FIG. 1 communicates with the expansion space 144 of the cylinder block denoted by B arranged at a relative position of 90 degrees. In the present embodiment, these are the same for the other seven sets of cylinder blocks.

A heat engine provided with a temperature difference as described above and having an expansion space and a contraction space communicating with each other and means for changing the respective volumes with a predetermined phase difference is widely known as a Stirling cycle device. For this reason, although the operation of each stroke is not described in detail, heat energy such as combustion gas arranged in the central opening 114 can be taken out as power of the crank device 150.

Next, the second embodiment shown in FIGS. 7 and 8 will be described.

7 and 8 are examples in which the present invention is applied to a form particularly suitable for effective use of exhaust heat of an exhaust pipe, FIG. 7 is a plan view thereof, and FIG. 8 is a sectional view thereof.

The exhaust pipe 71 integrated with the base includes a pair of first guide pins 71a and a pair of bearings for the crank device 75 at both ends of the exhaust inlet and outlet, respectively, and an expansion space 71c for accommodating a later-described displacer piston 74. A heat radiating portion 71b is formed on the outer periphery via the space 71d.

The displacer piston 74 is disposed so as to surround the exhaust pipe 71 and has a long shape extending in the exhaust flow direction in order to increase the heat receiving area.

The cross plates 73 and 77 have first guide elongated holes 73a and 77a and second guide elongated holes 73b and 77b formed in a cross shape, and the first guide elongated holes 73a and 77a are respectively formed at both ends of the exhaust pipe 71. The guide pin 71a is engaged.

The drive plates 72 and 76 are provided with second guide pins 72 a, which are coupled to the second guide elongated holes 73 b and 77 b, and are respectively driven synchronously by the crank device 75, and each is coupled to the displacer piston 74. is doing.

The crank device 75 is rotationally driven by a motor 78, whereby the drive plates 72 and 76 perform the same translational movement, so that the displacer piston 74 connected thereto is given an accurate reciprocating movement without being inclined in the longitudinal direction.

The means for actually taking out the output in the second embodiment described above is not shown, but is connected to a power piston provided with a separate power generator to control the phase difference by an electronic circuit, or As in the first embodiment, various known means such as providing a power piston and a cylinder connected to the displacer piston 74 and connecting the air chamber formed thereby and the adjacent contraction space 71d by a communication pipe can be adopted. .

Next, a third embodiment in which the present invention shown in FIG. 9 is applied to an internal combustion engine will be described.

In addition to the pair of first guide pins 91 a and the crank device 95, an internal gear 91 b is formed on the base 91 corresponding to each cylinder block 94.

The cross plate 93 has a first guide elongated hole portion 93a and a second guide elongated hole portion 93b in a cross shape, and the first guide elongated hole portion 93a is engaged with the first guide pin 91a.

The drive plate 92 includes a second guide pin 92a, engages with the second guide slot 93b, is driven by the crank device 95, and supports a pinion 96 described later.

The number of teeth of the pinion 96 is set to be 1/2 that of the internal gear 91b. The pinion 96 meshes with the internal gear 91b and pivotally supports one end of the connecting rod 97 on the pitch circle.

The valve device 98 is driven by a crank device 95 through a gear and a chain, and controls intake and exhaust of the cylinder 94.

In the piston drive device configured as described above, since the drive plate 92 and the pinion 96 pivotally supported by the drive plate 92 perform a uniform circular motion, a strictly linear motion by the inversion cycloid can be given to the connecting rod 97.

For this reason, harmful side pressure applied to the piston can be minimized, and it is extremely effective in reducing loss and reducing wear, and the effect is particularly remarkable in systems where the axial force of the connecting rod is high, such as in diesel engines. Become.

Although the embodiments applied to the Stirling engine and the internal combustion engine have been described above, the present invention is not limited to this. For example, the present invention is effective in a device that drives a plurality of movable parts such as a plunger in an oil pump with a predetermined phase difference from each other. It is a thing.

In the embodiment, the fixed bodies such as the cylinders are all arranged concentrically. However, according to the present invention, all the arbitrary points on the drive plate perform a uniform movement. The same effect can be expected in the arrangement of

Further, although all the embodiments have been described with the example in which the cylinder is arranged inside the drive plate, it is obvious that the same effect can be obtained even if the cylinder is arranged outside the drive plate.

  The present invention can be used in many industries such as an internal combustion engine, an external combustion engine, a Stirling engine, a heat pump, a compressor, an oil pump, and a hydraulic motor.

The top view containing the partial cross section in connection with the 1st Example of this invention. First embodiment CC sectional view in FIG. First embodiment DD sectional view in FIG. The perspective view which shows the drive principal part of 1st Example of this invention. Figure showing a conventional example Figure showing a conventional example The top view containing the partial cross section in connection with the 2nd Example of this invention. Second Embodiment EE sectional view in FIG. The top view in connection with the 3rd Example of this invention.

Explanation of symbols

110, 91 Base 111 Guide rollers 112, 71a, 91a First guide pin 113 Communication tube 113a Contraction side opening 113b Expansion side opening 114 Central opening 120, 72, 76, 92 Drive plates 121, 73b, 77b, 93b Second guide slot 122 Drive slot 123 Circular openings 130, 73, 77, 93 Cross plates 131, 73a, 77a, 93a First guide slots 132, 72a, 92a Second guide pins 140, 94 Cylinder Block 141 Heat cap 142, 64 Piston 143, 54 Cylinder 144, 71c Expansion space 145, 71d Contraction space 150, 55, 75, 95 Crank device 52, 61, 97 Connecting rod 52a Connecting portion 53 Main connecting rod 62 Translation member 63, 63a, 63b, 63 c link 71 exhaust pipe 71b heat dissipating part 74 displacer
76 Second drive plate 77 Second cross plate 78 Motor 91b Internal gear 96 Pinion 98 Valve device

Claims (3)

A base, a plurality of fixed bodies provided on the base, and a drive device configured to drive a plurality of movable bodies with a predetermined phase difference with respect to the fixed body, the rotary device rotating relative to the base A first member whose movement in the direction is restricted and allowed to move in a first predetermined direction, and which is engaged with the first member and restricted in movement in the rotational direction and perpendicular to the first direction. And a second member allowed to move in the second direction, and the movable body is driven by being engaged with the second member. 2. The movable body according to claim 1, wherein the first member is formed in an annular shape having an opening in the vicinity of the center, and the second member is driven by a crank device engaged at a position offset from the opening. Drive device. While including a displacer that extends in the direction of the central axis of the array and can reciprocate in directions close to and away from the center of the array, the displacer is driven by the plurality of second members. The Stirling engine drive device according to claim 2, further comprising a crank device that synchronously drives the plurality of second members.