JP6409476B2 - engine - Google Patents

Description

  The present invention relates to an engine. More specifically, the present invention includes a drive mechanism that enables high-capacity combustion that is advantageous for fuel efficiency by slowing down the moving speed of a piston in the vicinity of compression top dead center, and a machine with increased parts. The present invention relates to an engine capable of reducing the occurrence of vibration while suppressing loss.

  In general, in a reciprocating engine, by reducing the moving speed of a piston that reciprocates in a cylinder in the vicinity of the compression top dead center, high-capacity combustion that is advantageous for fuel efficiency can be performed. Here, the equal volume refers to the actual illustrated thermal efficiency ratio when the thermal efficiency when equal volume combustion at top dead center is 1.

  As a technique for making the moving speed of the piston variable, an engine or an apparatus in which a piston pin and a crank pin are connected by a multi-link mechanism has been proposed (for example, see Patent Documents 1 and 2).

  However, the techniques described in Patent Documents 1 and 2 have a problem in that the structure is complicated because the number of parts increases as compared with a general engine in which a piston pin and a crankpin are connected by a connecting rod. Further, in the device described in Patent Document 2, since one end of a swinging node (swing arm) constituting the multi-link mechanism is fixed, the rotation of the crank portion is compared with a link mechanism in which the swinging node is not fixed. There is a possibility that the fluctuation of the inertial force caused by the

  In order to solve such a problem, the inventor has devised an engine having a drive mechanism that slows the moving speed of the piston near the compression top dead center by using a planetary gear as shown in FIG. did.

  This drive mechanism 1 outputs the reciprocating motion of the piston 2 as the rotational driving force of the output shaft 3. The reciprocating motion portion 4, the planetary gear portion 5, the reciprocating motion portion 4 and the planetary gear portion 5 are connected to each other. It is comprised from the linear motion conversion part 6 to connect.

  The reciprocating unit 4 includes a hollow cylindrical cylinder 7 and a piston 2 that can reciprocate within the cylinder 7.

  The planetary gear unit 5 is a pair of annular internal gears 8a and 8b that are coaxial with the output shaft 3 and fixed so as not to rotate, and a pair of planetary gears 9a and 9b that mesh with the internal gears 8a and 8b, respectively. A first output external gear 10 that is coaxially fixed to the side surface of one planetary gear 9a, and a second output external gear 11 that is provided coaxially with the output shaft 3 and meshes with the first output external gear 10. ing. The first output external gear 10 and the second output external gear 11 constitute a sun gear. A crankpin 12 extending in parallel with the output shaft 3 is fixed at a position spaced (offset) from the shaft center on the opposite side surfaces of the planetary gears 9a and 9b.

  The linear motion conversion unit 6 linearly moves the first and second connecting rods 13 and 14, the guide shaft 15 extending in parallel with the shafts of the internal gears 8 a and 8 b, and both ends of the guide shaft 15 in the moving direction of the piston 2. And a shaft guide member 16 that is freely supported.

  The reciprocating unit 4 and the linear motion converting unit 6 are connected via a first connecting rod 13. One end of the first connecting rod 13 is rotatably supported by the piston 2 via a piston pin 17, while the other end is rotatably supported by a guide shaft 15.

  The planetary gear unit 5 and the linear motion conversion unit 6 are connected via a second connecting rod 14. One end of the second connecting rod 14 is rotatably supported by the guide shaft 15, while the other end is rotatably supported by the crank pin 12.

  The position where the crankpin 12 is offset is closest to the axis of the internal gears 8a and 8b when the piston 2 is at the top dead center or the bottom dead center, and the piston 2 is an intermediate position between the top dead center and the bottom dead center. Is the position farthest from the axis of the internal gear 8a, 8b.

The dimensional condition of each constituent member in the drive mechanism 1 satisfies the following expressions (1) and (2).
Rm <Rm + Rd <Rc (= 2 × Rm) (1)
0 <Rs, Rm + Rd + Rs <Rc (= 2 × Rm) (2)

  Here, Rc is the radius of the internal gears 8a and 8b, Rm is the radius of the planetary gears 9a and 9b, Rd is the offset amount between the axis of the planetary gears 9a and 9b and the axis of the crankpin 12, and Ro is The radius of the first output external gear 10 is indicated by Rs, and the radius of the crank pin 12 is indicated by Rs.

  Further, the axial length of the first connecting rod 13 is preferably set to be twice the axial length of the second connecting rod 14. Further, the gear ratio between the internal gears 8a and 8b and the planetary gears 9a and 9b is preferably 2: 1.

  In the drive mechanism 1, as shown in FIG. 2, the piston pin 17, the output shaft 3, and the guide shaft 15 move on a vertical axis that extends parallel to the first connecting rod 13. When the crankpin 12 revolves around the axis of the internal gears 8a and 8b together with the planetary gears 9a and 9b and revolves, the revolving track has an intermediate position between the top dead center and the bottom dead center. The elliptical orbit E becomes the major axis when the piston is at 2 and the minor axis when the piston 2 is at the top dead center or the bottom dead center. That is, the moving speed of the piston 2 near the compression top dead center can be made slower than the general engine in which the revolution orbit of the crankpin 12 forms a perfect circle orbit. Since the explosive force acts effectively on the top surface of No. 2, high-capacity combustion advantageous for fuel consumption can be realized.

  However, an engine equipped with such a drive mechanism 1 has a problem that mechanical loss due to an increase in parts occurs when a balance weight is installed to suppress the occurrence of vibration.

JP 2012-92843 A JP 2013-36449 A

  The object of the present invention is to provide a drive mechanism that enables high-capacity combustion advantageous in fuel efficiency by slowing the moving speed of the piston in the vicinity of the compression top dead center, and suppresses mechanical loss due to an increase in parts. An object of the present invention is to provide an engine that can reduce the occurrence of vibrations.

An engine of the present invention that achieves the above object is an engine having a piston that is rotatably supported at one end of a first connecting rod and reciprocates in a cylinder, and a drive mechanism . A gear, a planetary gear meshing with the internal gear, a sun gear meshing with the planetary gear and transmitting power to the output shaft, and a second side at a position away from the axis of the planetary gear on the side of the planetary gear . comprising a planetary gear unit having a crank pin for rotatably supported an end of the connecting rod, and a linear motion conversion portion, the linear motion converting part includes a first connecting rod and the second connecting rod, said first A guide shaft that rotatably supports the other ends of the first connecting rod and the second connecting rod, and a shaft guide member that supports the guide shaft so as to be linearly movable in the reciprocating direction of the piston. And the crankpin revolves around the axis of the internal gear together with the planetary gear, and the revolving orbit of the crankpin has a top dead center and a bottom dead center. An elliptical orbit having a long diameter when the piston is at the top dead center or the bottom dead center, and a pair of the cylinders are coaxial. And while arrange | positioning so that the top surface of a pair of said piston may face an outer side or an inner side, respectively, providing a common output shaft extended in parallel with a pair of said output shaft, a pair of said output shaft and said common output shaft, The pistons are connected via rotation synchronizing means for synchronizing the strokes of the pistons.

  According to the engine of the present invention, the inertial force accompanying the reciprocating motion of the pistons in the pair of drive mechanisms is canceled out by placing the pair of pistons facing each other without increasing the balance weight. Generation of vibration can be reduced while suppressing mechanical loss due to the increase.

It is a perspective view which shows the structure of a drive mechanism. It is a schematic diagram explaining operation | movement of a drive mechanism. It is a perspective view which shows the structure of the engine which consists of embodiment of this invention. It is a perspective view which shows another example of a rotation synchronizing means. It is a perspective view which shows the structure of the engine which consists of another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an engine according to an embodiment of the present invention. In the subsequent drawings, the same parts as those in FIG. 1 are denoted by the same reference numerals (excluding A and B characters), and the description thereof is omitted.

  This engine is provided with an even number of drive mechanisms 1 shown in FIG. 1, and a pair of drive mechanisms 1A and 1B are arranged such that cylinders 7A and 7B are coaxial and the top surfaces of the pair of pistons 2A and 2B are outside. It is arranged so as to face. In addition, the common output shaft 18 extends between the pair of output shafts 3A and 3B in parallel with the output shafts 3A and 3B, and the axis is positioned on a vertical axis extending in parallel with the pair of first connecting rods 13A and 13B. Is provided. Further, the pair of output shafts 3A, 3B and the common output shaft 18 are connected via a rotation synchronization means 19 that synchronizes the strokes of the pistons 2A, 2B. That is, the pair of output shafts 3A and 3B and the common output shaft 18 rotate in the same direction, and the output shafts 3A and 3B rotate symmetrically with respect to the common output shaft 18.

  The rotation synchronizing means 19 is composed of an endless chain or belt 20 wound around a pair of output shafts 3A and 3B and a common output shaft 18.

  As shown in FIG. 4, the rotation synchronization means 19 can also be constituted by spur gears 21 </ b> A and 21 </ b> B that mesh with the output shafts 3 </ b> A and 3 </ b> B and the common output shaft 18. The number of spur gears 21A and 21B is not limited to one each between the output shafts 3A and 3B and the common output shaft 18 as in the example of FIG. 4, and may be two or more.

  By arranging the pair of drive mechanisms 1A and 1B in this way, the inertial force is canceled by the reciprocating motion of the pair of pistons 2A and 2B, so that the occurrence of vibration is reduced while suppressing mechanical loss due to an increase in parts. It can be done. Further, since the outputs of the pair of drive mechanisms 1A and 1B are shared by the common output shaft 18, application to a vehicle or the like is facilitated.

  FIG. 5 shows an engine according to another embodiment of the present invention.

  In this engine, a pair of drive mechanisms 1A and 1B are arranged such that cylinders 7A and 7B are coaxial, and the top surfaces of the pair of pistons 2A and 2B face inward.

  By arranging the pair of drive mechanisms 1A and 1B in this way, the same effects as in the above embodiment can be obtained.

  In the case of an engine having four or more even number of drive mechanisms 1, a plurality of pairs of drive mechanisms 1 </ b> A and 1 </ b> B are arranged in parallel along the same common output shaft 18.

1, 1A, 1B Drive mechanism 2 Piston 3 Output shaft 7 Cylinders 8a, 8b Internal gears 9a, 9b Planetary gear 10 First output external gear 11 Second output external gear 18 Common output shaft 19 Rotation synchronization means 20 Chain or belt 21A, 21B spur gear

Claims (2)

A piston that is rotatably supported at one end of the first connecting rod and reciprocates in the cylinder;
An engine having a drive mechanism;
The drive mechanism includes an internal gear, a planetary gear that meshes with the internal gear, a sun gear that meshes with the planetary gear and transmits power to an output shaft, and an axis of the planetary gear on a side surface of the planetary gear. comprising a planetary gear unit having a crank pin for rotatably supported an end of the second connecting rod at spaced locations, and a linear motion conversion portion,
The linear motion converter includes the first connecting rod and the second connecting rod, a guide shaft that rotatably supports the other end of the first connecting rod and the second connecting rod, and a reciprocating movement of the guide shaft with the piston. A shaft guide member that is linearly movable in the moving direction, and
When the crankpin revolves around the axis of the internal gear together with the planetary gear and revolves, the revolving orbit of the crankpin becomes an intermediate position between the top dead center and the bottom dead center. When the major axis is an ellipse orbit, the piston is at the top dead center or the bottom dead center when the minor axis is the minor axis,
A pair of the drive mechanisms are arranged such that the pair of cylinders are coaxial and the top surfaces of the pair of pistons face outward or inward, respectively, and a common output shaft extending in parallel with the pair of output shafts Provided,
An engine characterized in that a pair of the output shaft and the common output shaft are connected via rotation synchronization means for synchronizing the stroke of the piston.   The rotation synchronizing means is a pair of the output shaft and an endless chain or belt wound around the common output shaft, or a spur gear meshing with the output shaft and the common output shaft. engine.

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