JP2005330889A - Power converting apparatus in which thrust load applied to side wall of cylinder is reduced - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power converting apparatus capable of performing continuous load operation by reducing thrust loads applied to the side walls of cylinders in a mechanism alternately converting the reciprocating motions of pistons and the rocking motion of an oscillating shaft. <P>SOLUTION: In the mechanism alternately converting the reciprocating motions of the pistons and the rocking motion of the rocking shaft, at least two cylinders C1 and C2 are radially installed about the rocking shaft R2, and the pistons P1 and P2 performing reciprocating motion in the cylinders and a rocking shaft arm RA1 fixed to the rocking shaft are connected to each other through connecting rods CR1 and CR2. Thus, since the ratio of the length of the connecting rods to the rocking shaft arms can be arbitrarily set up, the continuous operation can be performed by reducing the thrust loads. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention converts the reciprocating motion of a piston from a reciprocating motion of a piston into a rotating motion of an output shaft in an internal combustion engine or an air compressor, or the reciprocating motion of a piston from a rotating motion of an input shaft through a rocking motion. More particularly, the present invention relates to a power conversion device suitable for combustion of flame retardant fuel.

As a power conversion mechanism that replaces the conventional piston / crank mechanism, “four cylinders (C1), (C2), (as the axes of each pair of cylinders arranged facing each other on the same axis are orthogonal to each other on the same plane” Piston pins (p1), (p2), (p3) of the pistons (P1), (P2), (P3), (P4) that are arranged in a cross shape and slide in the cylinders ), (P4), the ends of four equilateral links (L1), (L2), (L3), (L4) are connected to each other so as to connect adjacent pins. The ends of the cross arms (A1) and (A2) crossing in the X shape are respectively attached to the midpoints of the pair of links (L1), (L3) and (L2), (L4). At one of the cross arms (A1) perpendicular to the working surface of the arm at the intersection of the arms, ) And the swing shaft (R1) is rotatably provided, the yoke is fixed to the end of the shaft, and the Z crankshaft (S1) is provided so that the axis is perpendicular to the axial direction of the swing shaft, An orthogonal bearing is provided so as to be slidably fitted to a crank pin that is oblique to the axis line between the rotating shafts, and swing pins on both sides in the orthogonal direction are axially supported between the pair of arms of the yoke on the axis line of the orthogonal bearing. Thus, a motion conversion device in an engine or the like characterized in that a swinging motion can be taken out from the reciprocating motion of the piston and converted into a rotational motion on the Z crankshaft via a yoke and an orthogonal bearing. -23521) has been proposed. Each symbol is shown in FIGS. 3 and 4.
By using the Z crank mechanism, it is possible to set the environment in the combustion chamber at high temperature and high pressure, and the piston speed becomes slow near the top dead center, so that sufficient combustion time can be secured. It is effective for combustion of flammable fuel and natural gas.
However, in this motion conversion device, the reciprocating motion centering on the cross arm and the swing motion are mutually converted, so the thrust load on the cylinder side wall is large, so it is difficult to operate continuously for a long time. There was a problem.
Japanese Patent Publication No.6-23521

The inventor of the present invention has arrived at the present invention as a result of intensive studies to solve the above problems. That is, an object of the present invention is to provide a flame retardant that converts a reciprocating motion into a revolving motion through a swinging motion or a revolving motion from a revolving motion into a reciprocating motion. Another object of the present invention is to provide a power conversion device that is effective for the combustion of natural fuel and natural gas, and that can reduce the thrust load applied to the cylinder side wall and can be operated continuously.

The power conversion device according to claim 1 of the present invention is described as follows: “In an internal combustion engine or an air compressor, the reciprocating motion of the piston is converted into the rotational motion of the output shaft through the swing motion, or the rotational motion of the input shaft. In the mechanism for converting the rotational motion and the rocking motion into each other in the power conversion device, which is converted into the reciprocating motion of the piston through the rocking motion, the rotation shaft (Z crankshaft: S2) and the rocking motion are converted. In the mechanism for connecting the dynamic shaft (R2) by the Z crank (Z2) and converting the reciprocating motion and the swing motion to each other, at least two cylinders (C1), (C2) are connected to the swing shaft ( Pistons (P1), (P2) that are installed radially around R2) and reciprocate in each cylinder, and a rocking shaft arm (RA1) fixed to the swing shaft are connected to connecting rods (CR1), (CR2) By connecting via relates suitable for the combustion of low combustibility fuel, the power conversion apparatus is characterized by a reduced thrust load applied to the cylinder side wall. " Each symbol is shown in FIGS. 1 and 2.

Regarding the mechanism for mutually converting the reciprocating motion of the piston and the rocking motion of the rocking shaft, in Japanese Patent Publication No. 6-23521, “four cylinders (C1), (C2), (C3), (C4) are cross-shaped. The piston pins (p1), (p2), (p3), (p4) of the pistons (P1), (P2), (P3), (P4) sliding in the cylinders As shown in FIG. 4, the ends of four equal links (L1), (L2), (L3), and (L4) are connected to each other so as to connect adjacent pins, and a pair of links (L1), which are opposed to each other. Ends of the cross arms (A1) and (A2) crossing each other in the X shape at the midpoints of (L3), (L2), and (L4), respectively, and the working surface of the arm at the intersection of the cross arms The swing shaft (R1) is fixed to one cross arm (A1) perpendicularly to the pivot arm and the swing shaft (R1) is rotated. It is provided in the standing. " Therefore, in Japanese Patent Publication No. 6-23521, the constituent elements of the link and the cross arm are limited to the same length, so that there is a problem that the thrust load applied to the cylinder is large and continuous operation for a long time is difficult. .
On the other hand, in the present invention, “at least two cylinders (C1), (C2) are arranged radially about the swing axis (R2), and pistons (P1), which reciprocate in the cylinders, (P2) and a rocking shaft arm (RA1) fixed to the swing shaft are connected via connecting rods (CR1) and (CR2) ”. As a result, the length ratio of the connecting rod and the rocking shaft arm can be set arbitrarily, and it is possible to reduce the thrust load and provide a power conversion device capable of continuous operation.
Hereinafter, the length ratio of the connecting rod and the rocking shaft arm is expressed as λ. λ = connecting rod length / rocking shaft arm length. However, the rocking shaft arm length is defined as the length from the connecting portion of the connecting rod and the rocking shaft arm to the center of the swing shaft.
FIG. 5 shows a graph in which fluctuations in the rotation axis angle θ and the thrust load are theoretically calculated. The mechanism in Japanese Patent Publication No. 6-23521 corresponds to λ = 1. It is clear that increasing the value of λ reduces the thrust load.

By using the Z crank mechanism, it is possible to set the environment in the combustion chamber to high temperature and high pressure, and the piston speed becomes slow near the top dead center, so that sufficient combustion time can be secured. Effective for combustion of flame retardant fuel and natural gas.

Compared with Japanese Patent Publication No. 6-23521, since the constituent elements are simple and the number of parts is small, the inertial mass is small and suitable for high-speed operation, and cost reduction and miniaturization are possible.

The state of operation when the power conversion device of the present invention is used in an internal combustion engine will be described with reference to FIGS. 1 and 2, but the present invention is not limited to the following embodiments.
The cylinders (C1) and (C2) are arranged so as to face each other with the swing axis (R2) as the center, and the pistons (P1) and (P2) inside each cylinder reciprocate by synchronized combustion.
Each piston is connected to a rocking shaft arm (RA1) fixed to the swing shaft (R2) via connecting rods (CR1) and (CR2), and the length of each component is appropriately set. Thus, the reciprocating motion of the piston is converted into the swinging motion of the swinging shaft. Further, by connecting the swing shaft (R2) and the Z crank shaft (S2) arranged orthogonal to the swing shaft via the Z crank (Z2), the swing motion of the swing shaft can be prevented. It is converted into the rotational motion of the Z crankshaft. The principle of the Z crank is the same as that of Japanese Patent Publication No. 6-23521.

The number of cylinders is preferably 2 or more, more preferably 2 or 4.

The length ratio λ is preferably 1.5 or more, and more preferably 2 to 4.

The connecting rod only needs to be able to transmit power, and the shape and material are not limited as long as the strength and durability are sufficiently satisfied.

The rocking shaft arm only needs to be able to transmit power, and the shape and material are not limited as long as the strength and durability are sufficiently satisfied.

FIG. 6 shows the mechanism when the number of cylinders is two and the length ratio λ = 2.17. This engine is prepared, the equivalence ratio is 0.9, the rotation speed and the ignition timing (θi) are 1200 rpm, θi = −7.5 ° ATDC), (900 rpm, θi = −5 ° ATDC), (600 rpm, respectively) , Θi = −6 ° ATDC), the pressure history (MPa) and the heat release rate (J / deg) in the combustion chamber are shown in FIG.

FIG. 8 shows a schematic diagram of the mechanism when the number of cylinders is three and λ = 2.

FIG. 9 shows a schematic diagram of the mechanism when the number of cylinders is four and λ = 2.

FIG. 10 shows a schematic diagram of the mechanism when the number of cylinders is four and λ = 2 and two connecting rods are connected to one end of the rocking shaft arm. The phases of the two pistons interlocking via one end of the rocking shaft arm are reversed.

Explanatory drawing of the mechanism in Claim 1 Schematic diagram of movable form of connecting rod and rocking shaft arm Explanatory drawing of mechanism in Japanese Patent Publication No. 6-23521 Schematic of the movable form of the cross arm part in Japanese Patent Publication No. 6-23521 Graph showing fluctuations of rotation axis angle and thrust load Explanatory drawing of the mechanism of Example 1 Pressure history and heat release rate of Example 1 Schematic diagram of mechanism of Example 2 Schematic diagram of mechanism of Example 3 Schematic diagram of mechanism of Example 4

Explanation of symbols

A1, A2: Cross arms L1, L2, L3, L4: Links C1, C2, C3, C4: Cylinders P1, P2, P3, P4: Pistons p1, p2, p3, p4: Piston pins R1, R2: Oscillating shafts Z1, Z2: Z crank S1, S2: Z crankshaft CR1, CR2, CR3, CR4: Connecting rod RA1: Rocking shaft arm θ: Rotating shaft angle (piston top dead center is 0 °)

Claims (1)

A power conversion device such as an internal combustion engine or an air compressor, which converts a reciprocating motion of a piston into a rotating motion of an output shaft through a swinging motion, or conversely through a swinging motion from a rotating motion of an input shaft. In the mechanism for mutually converting the rotational motion and the swing motion in the power conversion device, which is converted into the reciprocating motion of the piston, the rotary shaft (Z crank shaft: S2) and the swing shaft (R2) Are connected by a Z crank (Z2), and a reciprocating motion and a swinging motion are mutually converted, at least two cylinders (C1), (C2) are centered on a swinging shaft (R2). The pistons (P1) and (P2) that reciprocate in each cylinder and the rocking shaft arm (RA1) fixed to the swing shaft are connected via connecting rods (CR1) and (CR2). Connected Characterized by comprising Te, suitable for the combustion of low combustibility fuel, the power converter having a reduced thrust load applied to the cylinder side wall.

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