WO2023119354A1

WO2023119354A1 - Engine generator unit exclusively for electric power generation

Info

Publication number: WO2023119354A1
Application number: PCT/JP2021/046969
Authority: WO
Inventors: 純野口; 京輔塩見
Original assignee: ヤマハ発動機株式会社
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2023-06-29
Also published as: JPWO2023119354A1

Abstract

Provided is an engine generator unit which is exclusively for electric power generation and is capable of dampening the vibration of a horizontally-opposed engine without coupling the vibration. An engine generator unit 1, which is exclusively for electric power generation and does not have a motive power extraction mechanism for transmitting mechanical motive power to the outside, comprises: a horizontally-opposed engine 2 having at least two first cylinders 4 and second cylinders 7 arranged to the left and right of the rotation axis line C, of a crank shaft 8, serving as the center line; and a power generator 15 that couples a plurality of mounting members 16 for supporting the horizontally-opposed engine 2 to the crank shaft 8 of the horizontally-opposed engine 2. The plurality of mounting members 16 are arranged such that a composite elastic center Ec when all of the mounting members 16 are considered to be one elastic body matches the inertial center Ic of the engine generator unit 1 exclusively for electric power generation.

Description

Engine generator unit dedicated to power generation

The present invention relates to an engine generator unit dedicated to power generation.

Conventionally, horizontally opposed engines generate vibration due to the rotational moment around the crankshaft due to the reciprocating motion of the cylinder and the driving reaction force received when the driving force is transmitted to the load. In such a horizontally-opposed engine, the vibration of the horizontally-opposed engine can be efficiently damped by supporting the mount member at an appropriate position according to the engine type, installation state, application, and the like. The industrial unmanned helicopter disclosed in Patent Document 1 is equipped with a two-cylinder horizontally opposed engine as a power source. A crankshaft of the horizontally opposed engine is connected to a power transmission device via a clutch. A main rotor mast that rotates the main rotor is connected to the power transmission device. The industrial unmanned helicopter transmits the driving force of the horizontally opposed engine to the main rotor mast through the power transmission device by connecting the clutch.

The horizontally opposed engine of the industrial unmanned helicopter disclosed in Patent Document 1 is mounted on the body frame with the rotation axis of the crankshaft facing forward and backward of the body. A power transmission device is connected to the rear end of the crankshaft through the clutch. Thus, the horizontally opposed engine is configured integrally with the clutch and the power transmission device. The horizontally opposed engine is supported by a clutch housing and a vibration isolating member, which is a mount member provided in the vicinity of the main rotor mast of the power transmission device. The vibration isolating member of the clutch housing damps vibrations caused by a couple of forces around the center of inertia of the horizontally opposed engine. On the other hand, the vibration isolating member of the power transmission device attenuates vibration caused by fluctuations in the drive reaction force of the main rotor.

In addition, in Patent Document 2, an internal combustion engine is supported from the vehicle body in vibration isolation in order to improve the ride comfort and quietness of the vehicle by appropriately variably controlling a vibration isolation rubber device (mount member) capable of changing the dynamic spring constant. An anti-vibration support method is disclosed. In the anti-vibration support method for a vehicle internal combustion engine disclosed in Patent Document 2, an assembly in which a transmission is directly connected to a rotating shaft of the vehicle internal combustion engine is supported by a plurality of anti-vibration rubber devices. In the assembly, the axial ends of the center-of-gravity inertia main axis in rolling motion and the axial ends of the center-of-gravity inertia main axis in pitching motion are respectively supported by a pair of anti-vibration rubber devices. One pair of anti-vibration rubber devices has a center of elasticity when regarded as one elastic body located on the center-of-gravity inertia principal axis in the rolling motion of the assembly. The other pair of anti-vibration rubber devices has a center of elasticity when regarded as one elastic body located on the center-of-gravity inertia principal axis in pitching motion.

The assembly is connected to the drive wheels of the vehicle. In other words, the drive reaction force from outside such as the wheels is transmitted to the assembly. The one pair of anti-vibration rubber devices suppresses vibrations due to the drive reaction force and vibrations of the assembly itself based on an elastic principal axis based on an arbitrary position on the principal axis of inertia in rolling motion. Similarly, the other pair of anti-vibration rubber devices suppresses vibrations due to the drive reaction force and vibrations of the assembly itself based on an elastic principal axis with an arbitrary position on the inertial principal axis in pitching motion as a reference. Therefore, the center of elasticity of one pair of rubber vibration isolators and the center of elasticity of the other pair of rubber vibration isolators do not coincide with the center of inertia of the assembly. One pair of rubber vibration isolators and the other pair of rubber vibration isolators have elasticity in different directions at different positions in order to suppress the vibration of the assembly itself and the vibration due to the drive reaction force from the outside. A spindle isolates the assembly from vibrations.

JP-A-10-119897 JP-A-60-116937

On the other hand, in the case of an engine generator unit including the horizontally opposed engine, the horizontally opposed engine rotates the generator for generating electric power at a constant rotation speed. Vibration due to fluctuations in driving reaction force is less likely to occur as in the assembly of . In an engine generator unit equipped with such a horizontally opposed engine, the arrangement of mount members capable of damping vibrations without coupling them was studied.

An object of the present invention is to realize a configuration of an engine-generator unit that can attenuate the vibration of a horizontally opposed engine without coupling it.

The inventor studied the configuration of the mount member in an engine-generator unit that can attenuate the vibration of a horizontally opposed engine without coupling it. As a result of intensive studies, the inventors came up with the following configuration.

In an engine generator unit dedicated to power generation according to one embodiment of the present invention, at least two cylinders are arranged in a first direction and a second direction opposite to the first direction when viewed from the axial direction of the crankshaft. A machine externally provided with a horizontally opposed engine positioned so that the axis of a cylinder extends, a plurality of mounting members supporting the horizontally opposed engine, and a generator connected to a crankshaft of the horizontally opposed engine. It is an engine-generator unit dedicated to power generation that does not have a power take-off mechanism that transmits the actual power.

The plurality of mount members are positioned so that the center of elasticity when all the mount members are regarded as one elastic body coincides with the center of inertia of the engine generator unit dedicated to power generation.

In the above configuration, the engine generator unit dedicated to power generation does not have a power take-off mechanism that transmits mechanical power to the outside, such as a transmission that directly transmits an external load like an automobile engine. In other words, the mechanical load, which is the source of the drive reaction force, is not connected to the engine generator unit dedicated to power generation. Further, the horizontally opposed engine has a substantially equal weight distribution on the right and left sides with the axis of the crankshaft as the center line, and reciprocates in opposite directions with the two cylinders being 180 degrees reversed. Therefore, in the engine-generator unit dedicated to power generation having the horizontally opposed engine, the center of elasticity when all the mount members are regarded as one elastic body can easily be the center of inertia of the engine-generator unit dedicated to power generation. can be matched. Further, in the engine generator unit dedicated to power generation, the reaction force from all the mount members supporting the engine generator unit dedicated to power generation is applied to the center of inertia of the engine generator unit dedicated to power generation. Therefore, the generation-dedicated engine-generator unit is prevented from generating a force couple due to the reaction force from the mount member. Further, the engine generator unit dedicated to power generation suppresses vibrations by all the mounting members. As a result, the engine-generator unit dedicated to power generation can attenuate the vibration of the horizontally opposed engine by all the mount members without coupling the vibration.

From another point of view, the engine generator unit dedicated to power generation of the present invention preferably includes the following configuration. Among the elastic main axes of the plurality of mount members when all the mount members are regarded as one elastic body, the elastic main axis in the direction in which the rotation axis of the crankshaft extends is the inertia main axis of the engine generator unit dedicated to power generation. It is located so as to coincide with the principal axis of inertia in the direction in which the rotational axis of the crankshaft extends.

In the above configuration, in the engine generator unit dedicated to power generation, when all the mount members are regarded as one elastic body, the elastic principal axis in the direction in which the rotation axis of the crankshaft extends is the elastic principal axis dedicated to power generation. of the main inertia axes of the engine generator unit in the direction in which the rotation axis of the crankshaft extends. That is, in the engine generator unit dedicated to power generation, the reaction force from the direction in which the rotation axis of the crankshaft extends by all the mount members coincides with the direction of the principal axis of inertia of the engine generator unit dedicated to power generation. Therefore, in the engine generator unit dedicated to power generation, generation of a couple of forces that rotate the engine generator unit dedicated to power generation is suppressed. Therefore, in the engine-generator unit dedicated to power generation, coupling of vibration caused by the rotational moment generated about the rotation axis of the crankshaft is less likely to occur. Thus, the engine-generator unit dedicated to power generation can attenuate vibrations of the horizontally opposed engine by the plurality of mount members without coupling the vibrations.

From another point of view, the engine generator unit dedicated to power generation of the present invention preferably includes the following configuration. The plurality of mounting members are symmetrical about the center of inertia of the engine-generator unit dedicated to power generation when viewed from a direction perpendicular to the rotation axis of the crankshaft and a direction perpendicular to the moving direction of the cylinder. It is located so that

In the above configuration, the plurality of mount members have a symmetrical point about the center of inertia of the horizontally opposed engine when viewed from a direction perpendicular to the rotation axis of the crankshaft and a direction perpendicular to the movement direction of the cylinder. positioned symmetrically. That is, the plurality of mount members are positioned so as to surround the center of inertia of the horizontally opposed engine. Therefore, the horizontally opposed engine is stably supported by the plurality of mount members, and vibrations caused by the rotational moment about the crankshaft can be received by the plurality of mount members. Thus, the engine-generator unit dedicated to power generation can attenuate vibrations of the horizontally opposed engine by the plurality of mount members without coupling the vibrations.

From another point of view, the engine generator unit dedicated to power generation of the present invention preferably includes the following configuration. Generators are connected to both ends of the crankshaft of the horizontally opposed engine, respectively, and the plurality of mount members are mounted in a direction perpendicular to the direction in which the rotation axis of the crankshaft extends and in a direction perpendicular to the direction of movement of the cylinder. As can be seen, at least one is located in each of four regions defined by the rotation axis of the crankshaft and a straight line passing through the center of inertia of the engine-generator unit dedicated to power generation and extending in the moving direction of the cylinder.

In the above configuration, the plurality of mount members are arranged in four quadrants around the center of inertia of the horizontally opposed engine when viewed from a direction perpendicular to the rotation axis of the crankshaft and a direction perpendicular to the movement direction of the cylinder. At least one is located in each divided area. That is, the horizontally opposed engine is supported so as to surround the center of inertia by at least four of the mount members. Therefore, the horizontally opposed engine is more stably supported by the plurality of mount members, and can evenly receive the rotational moment about the crankshaft. Thus, the engine-generator unit dedicated to power generation can attenuate vibrations of the horizontally opposed engine by the plurality of mount members without coupling the vibrations.

From another point of view, the engine generator unit dedicated to power generation of the present invention preferably includes the following configuration. Generators are connected to both ends of the crankshaft of the horizontally opposed engine, and the plurality of mount members are positioned at the ends of the respective generators in the direction in which the rotation axis of the crankshaft extends. and when the plurality of mount members are regarded as one elastic body, the elastic main axis in the direction in which the rotation axis of the crankshaft extends is the inertia main axis of the engine-generator unit dedicated to power generation. It is located so as to coincide with the principal axis of inertia in the direction in which the rotation axis of the crankshaft extends.

In the above configuration, the engine generator unit dedicated to power generation is located at both end portions in the direction in which the rotation axis of the crankshaft extends, and is the engine generator dedicated to power generation when viewed from the direction in which the rotation axis of the crankshaft extends. It is supported by the mount member at a position overlapping the center of inertia of the unit. Therefore, in the engine generator unit dedicated to power generation, the rotational moment about the rotation axis of the crankshaft is received by the mount members provided at both ends in the direction in which the rotation axis of the crankshaft extends. At this time, since the main elastic axes of the plurality of mount members and the center of inertia of the horizontally opposed engine are aligned, the engine-generator unit dedicated to power generation will not be affected by the reaction force from the plurality of mount members and the deviation of the center of inertia. The generation of a couple of forces due to is suppressed. Thus, the engine-generator unit dedicated to power generation can attenuate vibrations of the horizontally opposed engine by the plurality of mount members without coupling the vibrations.

From another point of view, the engine generator unit dedicated to power generation of the present invention preferably includes the following configuration. The plurality of mount members have a smaller modulus of elasticity in a direction of force acting by a rotational moment about the rotational axis of the crankshaft than in other directions of force.

In the above configuration, the plurality of mount members support the horizontally opposed engine, and receive the force exerted by the rotational moment about the rotation axis of the crankshaft while being elastically deformed. That is, the plurality of mount members are configured such that the elastic modulus in the direction required to absorb vibration is smaller than the elastic modulus in the direction required to support the weight of the horizontally opposed engine. Thus, the engine-generator unit dedicated to power generation can attenuate vibrations of the horizontally opposed engine by the plurality of mount members without coupling the vibrations.

The technical terms used in this specification are used for the purpose of defining specific embodiments only, and are not intended to limit the invention by the technical terms.

As used herein, "and/or" includes all combinations of one or more of the associated listed constructs.

As used herein, the use of "including," "comprising," or "having," and variations thereof, refers to the features, steps, operations, elements, components, and /or may include one or more of steps, acts, elements, components and/or groups thereof, although specifying the presence of equivalents thereof.

As used herein, "attached," "connected," "coupled," and/or equivalents thereof are used broadly and include "direct and indirect" attachment, It includes both connection and coupling. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connections or couplings, but can include direct or indirect electrical connections or couplings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person skilled in the art to which this invention belongs.

Terms defined in commonly used dictionaries are to be construed to have a meaning consistent with their meaning in the context of the relevant art and this disclosure, unless explicitly defined herein. , is not to be interpreted in an idealized or overly formal sense.

It is understood that a number of techniques and processes are disclosed in the description of the present invention. Each of these has individual benefits and can also be used in conjunction with one or more, or possibly all, of the other disclosed techniques.

Therefore, for the sake of clarity, the description of the present invention refrains from unnecessarily repeating all possible combinations of individual steps. However, the specification and claims should be read with the understanding that all such combinations are within the scope of the present invention.

This specification describes an embodiment of an engine generator unit dedicated to power generation according to the present invention.

In the following description, a number of specific examples are set forth to provide a thorough understanding of the invention. However, it will be obvious to one skilled in the art that the invention may be practiced without these specific examples.

Accordingly, the following disclosure should be considered illustrative of the invention and is not intended to limit the invention to the specific embodiments illustrated by the following drawings or description.

[Engine generator unit for power generation]
In this specification, an engine-generator unit dedicated to power generation is a device that generates power by driving a generator composed of a dynamo or the like with various reciprocating engines such as a diesel engine and a gasoline engine. The engine generator unit dedicated to power generation controls the rotation speed of the engine to generate power in response to a power generation request from the outside. The engine generator unit dedicated to power generation does not have a power take-off mechanism for transmitting mechanical power to the outside. That is, the engine-generator unit dedicated to power generation does not supply the driving force of the engine to anything other than the generator. For example, the engine-generator unit dedicated to power generation that supplies electric power to the multicopter does not output power to rotate the propeller of the multicopter. In the present embodiment, the engine generator unit dedicated to power generation comprises a horizontally opposed engine.

[horizontally opposed engine]
In this specification, the term "horizontally opposed engine" refers to an engine in which at least two cylinders extend in a first direction and a second direction opposite to the first direction when viewed from the axial direction of the crankshaft. The engine is located in The horizontally opposed engine is a reciprocating engine in which pistons positioned in the cylinder move toward or away from each other. A horizontally opposed engine is positioned so that the axis of the crankshaft and the axis of the piston are horizontal. The first direction is the right direction or the left direction when the axial direction of the crankshaft of the horizontally opposed engine is defined as the front-rear direction.

[Mounting material]
In this specification, the mount member supports the engine-generator unit dedicated to power generation and attenuates kinetic energy (vibration) transmitted from the generator engine supported by the mount member to the outside. .

[Elastic principal axis]
In this specification, the term "elastic principal axis" refers to an axis such that when a force is applied along a certain axis, the direction of the force and the direction of elastic displacement are the same and no angular displacement occurs. For example, a compression spring compresses in the direction of the axis and does not undergo angular displacement when a force is applied in the direction of the axis. Therefore, the axis of the compression spring is one of the principal elastic axes of the compression spring. An elastic body has three elastic main axes that are perpendicular to each other.

[Elastic center]
In this specification, the term "elastic center" refers to an intersection point at which three elastic principal axes intersect each other at right angles in an elastic body.

[Elastic modulus]
In this specification, the elastic modulus is a physical property value representing the difficulty of deformation of an elastic body. The smaller the elastic modulus, the easier the deformation.

[Inertia principal axis]
In this specification, the principal axis of inertia is an axis that, when a rigid body is rotated around a certain axis, does not generate a couple of forces that would change the direction of the rotation axis when viewed from a coordinate system that rotates together with the rigid body. Say. In general, the principal axes of inertia of a rigid body are calculated from the moment of inertia and the product of inertia with the three orthogonal axes as coordinates.

[Center of Inertia]
As used herein, the center of inertia is the center of weight mass (center of gravity) or the center of inertia mass. Gravitational mass is the mass defined based on the strength with which an object is pulled by gravity. Inertial mass is mass defined based on the acceleration of an object. Gravimetric mass and inertial mass are equivalent. The center of inertia can be regarded as the center of mass where the mass of each part of the object is concentrated at the center of gravity.

[Coincidence between principal axis of inertia and principal axis of elasticity]
In this specification, the coincidence of the principal axis of inertia and the principal axis of elasticity refers to a positional relationship in which the deviation of the direction of the center of elasticity from the center of inertia is within 25 degrees, preferably within 5 degrees. The same applies to the coincidence of the rotation axis of the crankshaft and the elastic main axis.

According to one embodiment of the present invention, it is possible to realize a configuration of an engine-generator unit dedicated to power generation that can attenuate the vibration of a horizontally opposed engine without coupling it.

FIG. 1 shows a plan view of an engine generator unit dedicated to power generation according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing the elastic main axis and the elastic center of the mount member that supports the engine generator unit dedicated to power generation according to the first embodiment of the present invention. FIG. 3 shows a front view of an engine generator unit dedicated to power generation according to Embodiment 1 of the present invention. FIG. 4 shows a side view of an engine generator unit dedicated to power generation according to Embodiment 1 of the present invention. FIG. 5 shows a plan view of an engine generator unit dedicated to power generation according to Embodiment 2 of the present invention. FIG. 6 shows a schematic diagram showing the elastic principal axis and the elastic center of the mount member that supports the engine generator unit dedicated to power generation according to Embodiment 2 of the present invention. FIG. 7 shows a side view of an engine generator unit dedicated to power generation according to Embodiment 2 of the present invention.

Each embodiment will be described below with reference to the drawings. In each figure, the same parts are denoted by the same reference numerals, and the description of the same parts will not be repeated. Note that the dimensions of the constituent members in each drawing do not faithfully represent the actual dimensions of the constituent members, the dimensional ratios of the respective constituent members, and the like.

[Embodiment 1]
<Overall Configuration of Engine Generator Unit>
An engine-generator unit 1, which is an engine-generator unit dedicated to power generation, according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a plan view of the engine generator unit 1. FIG. FIG. 2 is a schematic diagram of the mount member 16 that supports the engine generator unit 1. As shown in FIG.

As shown in FIG. 1, the engine generator unit 1 according to Embodiment 1 of the present invention is a device dedicated to power generation that generates power by driving the generator 15 with the driving force of the engine. The engine generator unit 1 includes a horizontally opposed engine 2 , a generator 15 configured by a dynamo, and a plurality of mount members 16 . In the following embodiments, the direction in which the rotation axis C of the crankshaft 8 of the horizontally opposed engine 2 extends is defined as the front-rear direction. Further, the moving direction of the piston is defined as the left-right direction when viewed from a direction perpendicular to the rotation axis C of the crankshaft 8 and perpendicular to the moving direction of the cylinder. A vertical direction is defined as a direction perpendicular to the rotation axis C of the crankshaft 8 and the moving direction of the cylinder.

The horizontally opposed engine 2 is a horizontally opposed 2-cylinder engine. In the horizontally opposed engine 2, two cylinders are arranged so that the axes of the first cylinder 4 and the second cylinder 7 extend in the right direction and the left direction, which is the opposite direction to the right direction, when viewed from the direction of the rotation axis C of the crankshaft 8. It is the engine that is located. That is, the horizontally opposed engine 2 has cylinders on the left and right sides of the crankshaft 8 when viewed from a direction perpendicular to the rotation axis C of the crankshaft 8 and perpendicular to the moving direction of the cylinders (the first cylinder 4 and the second cylinder 7). engine located. The horizontally opposed engine 2 includes a first cylinder block 3, a second cylinder block 6, a first cylinder head 11, a second cylinder head 14, a crankshaft 8, a first connecting rod 10, a second connecting rod 13, a first piston 9, a second It has 2 pistons 12 .

The first cylinder block 3 is a member that forms part of the first cylinder 4 and the crankcase 5 . The first cylinder block 3 is made of, for example, an aluminum alloy. A first cylinder 4 accommodating a first piston 9 is formed in the first cylinder block 3 . A portion of a crankcase 5 that accommodates a crankshaft 8 is formed at the base end of the first cylinder 4 . A part of a bearing for supporting the crankshaft 8 is formed in the crankcase 5 . The axis of the first cylinder 4 is perpendicular to the axis of the bearing portion of the crankcase 5 . Also, the axis of the first cylinder 4 extends in the first direction viewed from the rotation axis C direction of the crankshaft 8 . In this embodiment, the first direction is the right direction. A base end of the first cylinder 4 communicates with the inside of the crankcase 5 .

The second cylinder block 6 is a member that forms part of the second cylinder 7 and the crankcase 5 . The second cylinder block 6 is made of, for example, an aluminum alloy. A second cylinder 7 accommodating a second piston 12 is formed in the second cylinder block 6 . A portion of a crankcase 5 that accommodates a crankshaft 8 is formed at the base end of the second cylinder 7 . A part of a bearing for supporting the crankshaft 8 is formed in the crankcase 5 . The axis of the second cylinder 7 is perpendicular to the axis of the bearing portion of the crankcase 5 . Further, the axis of the second cylinder 7 extends in the second direction opposite to the first direction when viewed from the rotation axis C direction of the crankshaft 8 . In this embodiment, the second direction is the left direction. A proximal end of the second cylinder 7 communicates with the inside of the crankcase 5 .

The first cylinder block 3 and the second cylinder block 6 are connected to each other with parts of the crankcases 5 facing each other. Thereby, the first cylinder block 3 and the second cylinder block 6 constitute a crankcase 5 . That is, the crankcase 5 is constructed between the first cylinder 4 and the second cylinder 7 . A bearing (not shown) that supports the crankshaft 8 is formed in the crankcase 5 . The axis of the bearing portion coincides with the rotational axis C of the crankshaft 8 .

The first cylinder 4 and the second cylinder 7 are positioned substantially parallel in the left-right direction with the rotation axis C of the crankshaft 8 as the center line. The first cylinder 4 is positioned to the right of the rotation axis C of the crankshaft 8 . The second cylinder 7 is positioned to the left of the rotation axis C of the crankshaft 8 . The first cylinder 4 and the second cylinder 7 are offset in the direction of the rotation axis C of the crankshaft 8 so that the first connecting rod 10 and the second connecting rod 13 connected to the crankshaft 8 do not interfere with each other.

The crankshaft 8 is a shaft that converts the reciprocating motion of the first piston 9 and the second piston 12 into rotary motion. The crankshaft 8 is rotatably supported by bearings of the crankcase 5 . A rotation axis C of the crankshaft 8 is perpendicular to the axes of the first cylinder 4 and the second cylinder 7 . Both ends of the crankshaft 8 extend outside from the crankcase 5 as output shafts.

The first piston 9 is a component that transmits energy generated by combustion of fuel generated in the first cylinder 4 to the crankshaft 8 . The first piston 9 is formed in a cylindrical shape having an outer diameter that allows it to slide inside the first cylinder 4 . A first piston 9 is housed in the first cylinder 4 . One end of a first connecting rod 10 is oscillatably connected to the first piston 9 . A crankshaft 8 is pivotably connected to the other end of the first connecting rod 10 . That is, the first piston 9 is oscillatably connected to the crankshaft 8 via the first connecting rod 10 . A first cylinder head 11 is connected to the tip of the first cylinder 4 . Thereby, a combustion chamber surrounded by the first cylinder head 11 and the first piston 9 is formed inside the first cylinder 4 .

The second piston 12 is a component that transmits energy generated by combustion of fuel generated in the second cylinder 7 to the crankshaft 8 . The second piston 12 is formed in a cylindrical shape having an outer diameter that allows it to slide inside the second cylinder 7 . The second piston 12 is housed in the second cylinder 7 . One end of a second connecting rod 13 is oscillatably connected to the second piston 12 . Furthermore, the crankshaft 8 is connected to the other end of the second connecting rod 13 so as to be able to swing. That is, the second piston 12 is oscillatably connected to the crankshaft 8 via the second connecting rod 13 . A second cylinder head 14 is connected to the tip of the second cylinder 7 . Thereby, a combustion chamber surrounded by the second cylinder head 14 and the second piston 12 is formed inside the second cylinder 7 .

In the horizontally opposed engine 2 configured in this way, the first piston 9 and the second piston 12 are positioned on the left and right sides of the crankshaft 8 positioned so that the rotation axis C extends in the longitudinal direction. The axis of the first piston 9 and the axis of the second piston 12 extend substantially horizontally and are perpendicular to the rotation axis C of the crankshaft 8 . The horizontally opposed engine 2 rotates the crankshaft 8 by reciprocating in opposite directions with the first piston 9 and the second piston 12 being reversed by 180 degrees.

The generator 15 is a device that generates electric power. The generator 15 is composed of a dynamo or the like. The generators 15 are fixed one by one to both ends of the crankcase 5 of the horizontally opposed engine 2 in the direction in which the rotation axis C of the crankshaft 8 extends through flanges. That is, the engine generator unit 1 has two generators 15 . The two generators 15 are connected to both ends of the crankshaft 8, respectively. As a result, the two generators 15 are configured to simultaneously generate electric power by the rotation of the crankshaft 8 . Thus, the engine generator unit 1 powers two generators 15 . That is, the engine generator unit 1 does not supply power to external devices unrelated to the operation of the engine generator unit 1 . Naturally, the engine-generator unit 1 does not have a transmission for powering external devices. The engine-generator unit 1 is configured as an engine-generator unit dedicated to power generation without a power take-off mechanism for transmitting mechanical power to the outside.

A plurality of mounting members 16 support the engine generator unit 1 and attenuate the vibration of the engine generator unit 1 . The plurality of mount members 16 are composed of rubber mounts using rubber, for example. Rubber mounts are composed of rubber such as natural rubber, butyl rubber or chloroprene rubber.

As shown in FIG. 2, the plurality of mount members 16 are, for example, cylindrical rubber mounts in which metal mounting portions 16b are fixed to both ends of a cylindrical rubber member 16a. The cylindrical rubber mount supports the external force applied to the mounting portion 16b by the rubber member 16a, and attenuates vibration input from one mounting portion 16b by elastic deformation of the rubber member 16a. The cylindrical rubber mount changes its load capacity and vibration characteristics depending on the size, shape, attitude, hardness, etc. of the rubber member 16a.

As shown in FIG. 1, in this embodiment, the plurality of mounting members 16 are such that the axes of the first cylinder 4 and the second cylinder 7 of the horizontally opposed engine 2 are aligned by four mounting members 16 having the same load resistance and vibration characteristics. It supports the engine generator unit 1 so as to be in a substantially horizontal state. One attachment portion 16 b (see FIG. 2 ) of the plurality of mount members 16 is connected to the crankcase 5 via a bracket 17 . The other mounting portions 16b (see FIG. 2) of the plurality of mounting members 16 are connected to a fixing frame (not shown) that fixes the engine generator unit 1. As shown in FIG. In other words, the four mounting members 16 support the horizontally opposed engine 2 in the engine generator unit 1 .

The engine-generator unit 1 configured in this way drives two generators 15 with the horizontally opposed engine 2 . The engine generator unit 1 supplies electric power to the outside from two generators 15 . In the engine generator unit 1, the first cylinder 4 and the second cylinder 7 are positioned substantially horizontally on the left and right sides of the crankshaft 8, and the generators 15 are positioned on the front and rear sides of the crankshaft 8, respectively. That is, the engine-generator unit 1 is configured so that the weight distribution in the left-right direction, the front-rear direction, and the vertical direction is substantially uniform. The engine generator unit 1 is supported from a fixed frame (not shown) by a plurality of mounting members 16 .

<Arrangement of mounting member for engine generator unit>
Next, the arrangement of the plurality of mount members 16 with respect to the engine generator unit 1 will be described with reference to FIGS. 1 to 4. FIG. FIG. 3 is a front view of the engine generator unit 1. FIG. 4 is a side view of the engine generator unit 1. FIG.

As shown in FIGS. 1 and 3, generators 15 are connected to both ends of the crankshaft 8 of the horizontally opposed engine 2, respectively. Therefore, the center of inertia Ic of the engine generator unit 1 is located on the rotation axis C of the crankshaft 8 and in the vicinity of the second connecting rod 13 . In the engine-generator unit 1 , one of the three main inertia axes Ix, Iy, and Iz perpendicular to each other, Ix, substantially coincides with the rotational axis C of the crankshaft 8 .

As shown in FIG. 2, the mount member 16 composed of a cylindrical rubber mount has three elastic principal axes E1, E2, and E3 perpendicular to each other. The three elastic main axes E1, E2, E3 are determined based on the elastic modulus of the rubber member 16a. The mount member 16 also has an elastic center E0 at which the three elastic main axes E1, E2, and E3 intersect perpendicularly. In the cylindrical rubber mount, the main elastic axis in the direction in which the mounting portions 16b are brought closer (separated) from each other is defined as the main elastic axis E1 in the compression direction. Two elastic main axes orthogonal to the compression direction elastic main axis E1 are defined as a first shear direction elastic main axis E2 and a second shear direction elastic main axis E3.

As shown in FIGS. 3 and 4, the four mounting members 16 that support the engine generator unit 1 can be regarded as one elastic body that supports the engine generator unit 1. A synthetic mount member that is regarded as one elastic body by synthesizing the four mount members 16 is an elastic principal axis obtained by synthesizing the elastic principal axes E1, E2, and E3 (see FIG. 2) of the four mount members 16. It has three synthetic principal elastic axes Ex, Ey, and Ez. The three synthetic principal elastic axes Ex, Ey, and Ez are calculated in consideration of the directions of the principal elastic axes E1, E2, and E3 of the four mount members 16, respectively. The synthetic mount member also has a synthetic elastic center Ec, which is an elastic center at which the three synthetic elastic principal axes Ex, Ey, and Ez are perpendicular to each other. That is, the directions of the synthetic elastic principal axes Ex, Ey, Ez and the position of the synthetic elastic center Ec change depending on the elastic moduli and attitudes of the four mount members 16 .

The four mount members 16 are positioned so that the composite elastic center Ec when regarded as a composite mount member coincides with the inertia center Ic of the engine generator unit 1 . In this embodiment, the compression direction elastic main axis E1 of the mounting members 16 arranged in the left-right direction among the four mounting members 16 is the inertia of the engine generator unit 1 when viewed from the direction in which the rotation axis C of the crankshaft 8 extends. They intersect on a vertical line passing through the center Ic (see FIG. 4). Further, the compression direction elastic principal axis E1 of the mounting members 16 arranged in the front-rear direction among the four mounting members 16 is the same as the engine generator unit 1 when viewed from the direction in which the axis of the first cylinder 4 or the second cylinder 7 extends. intersect on a vertical line passing through the center of inertia Ic (see FIG. 3).

In the above-described configuration, the four mount members 16 are composed of synthetic elastic principal axes Ex, Ey, and Ez when the four mount members 16 are regarded as synthetic mount members. Among the main inertia axes Ix, Iy, and Iz, the main inertia axis Ix of the crankshaft 8 in the direction of the rotation axis C is positioned so as to coincide with the main inertia axis Ix.

With this configuration, the engine-generator unit 1 to which the mechanical load, which is the source of the drive reaction force, is not connected, is mainly affected by the rotational moment around the rotational axis C of the crankshaft 8 of the horizontally opposed engine 2. It is the cause of the vibration. Furthermore, the engine-generator unit 1 has a horizontally opposed engine 2 configured so that the weight distribution in the left-right direction, the front-rear direction, and the vertical direction is substantially uniform. Therefore, the engine generator unit 1 can easily match the combined elastic center Ec of the plurality of mount members 16 with the inertia center Ic of the engine generator unit 1 . Therefore, in the engine generator unit 1, since the reaction force from the plurality of mount members 16 is applied to the center of inertia Ic of the engine generator unit 1, the vibration of the horizontally opposed engine 2 can be received evenly by the plurality of mount members 16. can.

In the engine-generator unit 1, the reaction force from the direction in which the rotational axis C of the crankshaft 8 extends (the direction of the synthetic elastic principal axis Ex) by the plurality of mount members 16 coincides with the direction of the inertia principal axis Ix of the engine-generator unit 1. ing. Therefore, in the engine-generator unit 1, a torque couple that rotates the engine-generator unit 1 due to the rotational moment generated about the rotation axis C of the crankshaft 8 is not generated. That is, in the engine-generator unit 1, coupled vibration caused by the rotational moment generated about the rotational axis C of the crankshaft 8 is less likely to occur. As a result, the engine generator unit 1 can attenuate the vibration of the horizontally opposed engine 2 by the plurality of mount members 16 without coupling the vibration.

Further, the four mounting members 16 having the same load resistance and vibration characteristics are mounted in a direction perpendicular to the direction in which the rotation axis C of the crankshaft 8 extends and perpendicular to the moving directions of the first cylinder 4 and the second cylinder 7 . When viewed from the direction, they are positioned symmetrically about the center of inertia Ic of the engine generator unit 1 as a point of symmetry. At this time, the plurality of mount members 16 are mounted on the horizontally opposed engine 2 when viewed in a direction perpendicular to the direction in which the rotation axis C of the crankshaft 8 extends and in a direction perpendicular to the movement direction of the first cylinder 4 and the second cylinder 7 . is located so as to surround the center of inertia Ic.

Therefore, the engine-generator unit 1 is stably supported by the plurality of mount members 16, and the vibration caused by the rotational moment of the crankshaft 8 about the rotation axis C can be evenly received by the plurality of mount members 16. . As a result, the engine generator unit 1 can attenuate the vibration of the horizontally opposed engine 2 by the plurality of mount members 16 without coupling the vibration.

In the above configuration, when the engine-generator unit 1 is supported by four or more mount members 16, the plurality of mount members 16 are arranged in a direction perpendicular to the direction in which the rotation axis C of the crankshaft 8 extends and and in the moving direction of the first cylinder 4 and the second cylinder 7 passing through the rotation axis C of the crankshaft 8 and the center of inertia Ic of the engine-generator unit 1 when viewed from a direction perpendicular to the moving direction of the second cylinder 7. At least one is located in each of the four regions separated by the extending straight lines.

The engine generator unit 1 is mounted by at least four mounting members 16 when viewed in a direction perpendicular to the direction in which the rotation axis C of the crankshaft 8 extends and in a direction perpendicular to the moving direction of the first cylinder 4 and the second cylinder 7 . It is supported so as to surround the center of inertia Ic. Accordingly, the horizontally opposed engine 2 is more stably supported by the plurality of mount members 16 and can evenly receive the rotational moment around the crankshaft 8 . As a result, the engine generator unit 1 can attenuate the vibration of the horizontally opposed engine 2 by the plurality of mount members 16 without coupling the vibration. Further, in the present embodiment, the engine generator unit 1 does not have any mount members for damping vibration other than the four mount members 16 . The engine generator unit 1 absorbs vibrations of the horizontally opposed engine 2 by means of four mounting members 16 positioned so that the center of elasticity when regarded as one elastic body coincides with the center of inertia of the engine generator unit 1. It can be attenuated without coupling.

[Embodiment 2]
<Support from the rotation axis direction of the crankshaft>
An engine generator unit 1A according to Embodiment 2 of the present invention will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a plan view of an engine generator unit 1A according to Embodiment 2 of the present invention. FIG. 6 is a schematic diagram showing a mount member according to Embodiment 2 of the present invention. In addition, in the following embodiments, the specific description of the same points as those of the already described embodiments will be omitted, and the description will focus on the different parts.

As shown in FIG. 5, the engine generator unit 1A according to Embodiment 2 of the present invention is supported by two mount members 18 as a plurality of mount members 18. As shown in FIG.

As shown in FIG. 6, the plurality of mounting members 18 support the engine generator unit 1A and attenuate the vibration of the engine generator unit 1A. The plurality of mount members 18 are configured by rubber mounts using rubber. The plurality of mount members 18 are, for example, a cylindrical rubber member 18a with a metal outer cylinder 18b fixed to the outer peripheral surface of the rubber member 18a and a metal inner cylinder 18c fixed to the inner peripheral surface of the rubber member 18a. It consists of mounts. The cylindrical rubber mount supports the external force applied to the outer cylinder 18b or the inner cylinder 18c by the rubber member 18a, and attenuates the vibration input from the outer cylinder 18b or the inner cylinder 18c by elastic deformation of the rubber member 18a. The load capacity and vibration characteristics of the cylindrical rubber mount vary depending on the size, shape, attitude, hardness, etc. of the rubber member 18a.

In this embodiment, the plurality of mount members 18 are arranged so that the axes of the first cylinder 4 and the second cylinder 7 of the horizontally opposed engine 2 are substantially horizontal by two mount members 18 having the same load resistance and vibration characteristics. supports the engine generator unit 1A. One attachment portion 16b of the plurality of mount members 18 is connected to the generator 15 via a bracket. The other mounting portions 16b of the plurality of mounting members 18 are connected to a fixed frame that fixes the engine generator unit 1A.

<Arrangement of mounting member for engine generator unit>
Next, the arrangement of the plurality of mount members 18 with respect to the engine generator unit 1A will be described with reference to FIGS. 5 to 7. FIG. FIG. 7 is a side view of an engine generator unit 1A according to Embodiment 2 of the present invention.

The mount member 18, which is a cylindrical rubber mount, has three elastic main axes E1, E2, and E3 perpendicular to each other. The three elastic main axes E1, E2, E3 are determined based on the elastic modulus of the rubber member 18a. The mount member 18 also has an elastic center E0 at which the three elastic main axes E1, E2, and E3 intersect perpendicularly. In the cylindrical rubber mount, the main elastic axes in the two orthogonal radial directions are defined as a first elastic main axis E1 and a second elastic main axis E2. The principal elastic axis in the axial direction is assumed to be the principal elastic axis in the shear direction E3.

The two mount members 18 are positioned so that the composite elastic center Ec when regarded as a composite mount member coincides with the inertia center Ic of the engine generator unit 1A. In this embodiment, the two mounting members 18 support the two generators 15 of the engine generator unit 1A. The two mounting members 18 are connected to the ends of the crankshaft 8 in the direction of the rotational axis C of the respective generators 15 . Further, when the two mount members 18 are regarded as synthetic mount members, the synthetic elastic principal axis Ex of the synthetic elastic principal axes Ex, Ey, and Ez in the direction in which the rotation axis C of the crankshaft 8 extends corresponds to the engine generator unit 1A. of the main inertia axes Ix, Iy, and Iz of the crankshaft 8 in the direction in which the rotation axis C of the crankshaft 8 extends.

At this time, the two mount members 18 are configured so that the elastic modulus in the direction of force acting by the rotational moment about the rotation axis C of the crankshaft 8 is smaller than the elastic modulus in other force directions. there is That is, the two mount members 18 have the greatest characteristic of damping vibration caused by the force acting by the rotational moment about the rotation axis C of the crankshaft 8 by elastic deformation.

In the engine generator unit 1A, the composite elastic center Ec when the two mount members 18 are regarded as a composite mount member coincides with the inertia center Ic of the engine generator unit 1A. The generation of a force couple due to the deviation between the reaction force from the center of inertia Ic and the center of inertia Ic is suppressed. The two mount members 18 support the engine-generator unit 1A, and receive the force exerted by the rotational moment about the rotational axis C of the crankshaft 8 while being elastically deformed. As a result, the engine generator unit 1A can attenuate the vibration of the horizontally opposed engine 2 by the plurality of mount members 18 without coupling the vibration.

(Other embodiments)
In all the above-described embodiments, the

engine generator units

1 and 1A have two generators 15 connected to both ends of the crankshaft 8 . However, the engine generator unit is not limited to the configuration of the above embodiments. For example, the engine generator unit may be configured with only one generator at the end of the crankshaft.

In addition, in all the embodiments described above, the engine-

generator units

1 and 1A have the two-cylinder horizontally opposed engine 2 . However, the horizontally opposed engine is not limited to the configurations of the above-described embodiments. For example, the engine generator unit may have a horizontally opposed engine with multiple cylinders.

Also, in all the above-described embodiments, the engine generator unit 1 is supported by four mounting members, and the engine generator unit 1A is supported by two mounting members. However, the configuration of the engine generator unit is not limited to the configuration of the above-described embodiment. For example, the engine generator unit may be configured to be supported by two or more mounting members.

Also, in all the above-described embodiments, the

engine generator units

1, 1A are supported by rubber mounts. However, the configuration of the engine generator unit is not limited to the configuration of the above-described embodiment. For example, the engine-generator unit may be supported by hydraulic, hydraulic, electromagnetic, vacuum, or piezo mounts.

Also, in the above-described embodiments, the

engine generator units

1 and 1A are supported by columnar rubber mounts or cylindrical rubber mounts. However, the engine generator unit is not limited to the configuration of the above embodiments. For example, the engine-generator unit may be configured to be supported by rubber mounts of other shapes, such as V-shaped rubber mounts and O-shaped rubber mounts.

Also, in the second embodiment described above, the two mount members 18 are connected to the ends of the respective generators 15 in the direction in which the rotation axis C of the crankshaft 8 extends. However, the engine generator unit is not limited to the configuration of the above embodiments. For example, the engine generator unit may have a configuration in which the auxiliary mount member is connected in a direction perpendicular to the rotation axis of the crankshaft. The auxiliary mount member is a mount member that suppresses rotation of the crankshaft of the horizontally opposed engine about the rotation axis. The engine-generator unit does not couple vibrations of the horizontally opposed engine 2 by aligning the combined elastic center of the composite mount member of the two mount members and the auxiliary mount member with the inertia center of the engine-generator unit. can be attenuated.

Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, without being limited to the above-described embodiment, it is possible to modify the above-described embodiment as appropriate without departing from the spirit thereof.

Reference Signs List

1, 1A engine-generator unit 2 horizontally opposed engine 15

generator

16, 18 mount member Ic center of inertia Ec composite elastic center I0 elastic center Ix, Iy, Iz inertia principal axis Ex, Ey, Ez composite elastic principal axis

Claims

a horizontally opposed engine in which at least two cylinders are positioned such that the axes of the cylinders extend in a first direction and a second direction opposite to the first direction when viewed from the axial direction of the crankshaft;
a plurality of mount members for supporting the horizontally opposed engine; a generator connected to a crankshaft of the horizontally opposed engine;
An engine generator unit dedicated to power generation that does not have a power take-off mechanism that transmits mechanical power to the outside,
The plurality of mounting members are
The center of elasticity when all the mount members are regarded as one elastic body is located so as to coincide with the center of inertia of the engine generator unit dedicated to power generation.
An engine generator unit dedicated to power generation.
In the engine generator unit dedicated to power generation according to claim 1,
The plurality of mounting members are
When all the mount members are regarded as one elastic body, of the elastic main shafts, the elastic main shaft in the direction in which the rotation axis of the crankshaft extends is the main inertia shaft of the engine generator unit dedicated to power generation, and the rotation of the crankshaft. An engine-generator unit dedicated to power generation, positioned so as to coincide with the principal axis of inertia along which the axis extends.
In the engine generator unit dedicated to power generation according to claim 1 or 2,
The plurality of mounting members are
When viewed from the direction perpendicular to the rotation axis of the crankshaft and the direction perpendicular to the movement direction of the cylinder, they are positioned symmetrically with respect to the center of inertia of the engine-generator unit dedicated to power generation. , an engine-generator unit dedicated to power generation.
In the engine generator unit dedicated to power generation according to any one of claims 1 to 3,
Generators are connected to both ends of the crankshaft of the horizontally opposed engine,
The plurality of mounting members are
When viewed from the direction perpendicular to the direction in which the rotation axis of the crankshaft extends and the direction perpendicular to the direction of movement of the cylinder, the At least one engine-generator unit dedicated to power generation, located in each of four regions separated by straight lines extending in the moving direction of the cylinder.
In the engine generator unit dedicated to power generation according to any one of claims 1 to 3,
Generators are connected to both ends of the crankshaft of the horizontally opposed engine,
The plurality of mounting members are
Rotation of the crankshaft of the elastic main shaft when each of the generators is positioned at the end in the direction in which the rotation axis of the crankshaft extends and all the mount members are regarded as one elastic body. An engine generator dedicated to power generation, wherein a principal elastic axis in an axis extending direction is positioned so as to coincide with a principal inertia axis of the principal inertia axis of the engine generator unit dedicated to power generation in a direction in which the rotation axis of the crankshaft extends. unit.
In the engine generator unit dedicated to power generation according to claim 5,
The plurality of mounting members are
An engine-generator unit dedicated to power generation, wherein the modulus of elasticity in the direction of force acting by the rotational moment about the axis of rotation of the crankshaft is smaller than the modulus of elasticity in other directions of force.