JP2003269541A - Balancer device of reciprocating engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a balancer device of a reciprocating engine capable of reducing overall height and overall width of an engine, reducing the weight of the engine, realizing a compact layout near a front end and a rear end of the engine, and simplifying adjustment of an unbalance couple with a balancer device by making a balancer device for removing an inertia couple in the reciprocating engine small, compact and light, and reducing an installation space of the balancer device. <P>SOLUTION: In this reciprocating engine, an unbalance force such as inertia couple is balanced and removed by the balancer device attached to a rotation shaft. The balancer device has a sun gear fixed to the rotation shaft, a ring gear having unbalance weight in a perimeter direction and coaxial with the rotation shaft, and a plurality of planetary gears meshed with the sun gear and the ring gear. A planetary gear type balancer device is constituted in a manner to remove the unbalance force by the unbalance weight installed to the ring gear. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a reciprocating engine equipped with a piston-crank mechanism, and more particularly to a reciprocating internal combustion engine, in which an unbalanced force including an inertia couple is attached to a rotating shaft including a crankshaft. The present invention relates to a balancer device for a reciprocating engine, which is configured to be balancedly removed by a balancer device.

[0002]

2. Description of the Related Art In a reciprocating internal combustion engine having a piston-crank mechanism, an unbalanced force is generated due to the weight of reciprocating parts such as a piston and a connecting rod. The unbalanced force causes vibration and noise of the internal combustion engine. Therefore, it is essential to completely remove the unbalanced force by a balancer device attached to the rotating shaft including the crankshaft. In particular, when primary undesired forward and reverse rotational inertia couples remain as such unbalanced forces, balancer devices are respectively installed on the crankshaft and the rotary shaft that rotates in reverse with respect to the crankshaft, and the inertia couples are installed. Balanced with force, this can be eliminated.

FIG. 4 shows the arrangement of an inertia couple removal balancer device in a reciprocating internal combustion engine (hereinafter referred to as an engine). In the figure, 1 is the crankshaft of the engine, 9 is the shaft center of the crankshaft 1, and in order to completely remove the forward rotation inertia couple Mf and the reverse rotation inertia couple Mr as described above,
A forward rotation balancer 200 capable of generating a forward rotation balance couple of Mf / 2 and a reverse rotation balancer 100 capable of producing a reverse rotation balance couple of Mr / 2 are installed at the front end of the crankshaft 1, and A forward rotation balancer 200 that can generate a forward rotation balancing couple of Mf / 2 at the rear end of the crankshaft 1.
And a reverse rotation balancer 100 that can generate reverse rotation balancing couples of Mr / 2, respectively.

FIG. 5 is a schematic cross-sectional view perpendicular to the crankshaft center showing one example of the arrangement structure of the forward rotation inertia couple and the counter rotation inertia couple removal balancer device in such an engine. In the figure, 1 is a crankshaft, 9 is a crankshaft center,
Reference numeral 2 is a crank gear fixed to the crank shaft 1.
Reference numeral 100 denotes a reverse rotation balancer, which is formed by locally forming lightening holes 06 at predetermined positions in the circumferential direction and the radial direction of the balancer gear 04 (reverse rotation with respect to the crank gear 2) meshing with the crank gear 2 to form a circle of the balancer gear 04. The mass in the circumferential direction is made non-uniform to generate a counter rotating balance couple, and the counter rotating balance couple is balanced with the counter rotating inertia couple of the engine to remove the counter rotating inertia couple. Reference numeral 05 is a balancer shaft to which the balancer gear 04 is attached.

Reference numeral 200 denotes a forward rotation balancer, which is locally located at a predetermined position in the circumferential and radial directions of the forward rotation balancer gear 07 (normal rotation with respect to the crank gear 2) which meshes with the reverse rotation balancer gear 04. The lightening hole 09 is bored to make the mass of the balancer gear 07 in the circumferential direction non-uniform to generate a positive rotation balancing couple, and the positive rotation balancing couple is balanced with the positive rotation inertia couple of the engine. Positive rotation inertia couple is removed. Reference numeral 08 is a balancer shaft to which the balancer gear 07 is attached.

[0006]

In the balancer device for removing an inertial couple in a reciprocating internal combustion engine (engine) as shown in FIG. 5, the crankshafts at the front end portion and the rear end portion of the engine are perpendicular to each other. Reverse rotation balancer 10
The balancer gear 04 and the forward rotation balancer 20 which constitute 0
It is necessary to install the gear train of the balancer gear 07 constituting 0 in the height direction or the width direction of the engine at an axis different from the crank axis, and the balancer gear 04 for the reverse rotation and the forward rotation. Since the balancer gear 07 needs to have the same diameter as the crank gear 2, the installation space for the reverse rotation balancer 100 and the forward rotation balancer 200 becomes large, and the overall height or width of the engine increases and the engine weight also increases.

Further, in such a conventional technique, as described above, the reverse rotation balancer 100 and the forward rotation balancer 20.
Since the installation space of 0 is large, the installation of auxiliaries in the vicinity of the front end portion and the rear end portion of the engine is restricted, and the layout of the auxiliaries is difficult, and the compact portion near the front end portion and the rear end portion of the engine Layout is disturbed.

Further, in such a conventional technique, in the reverse rotation balancer 100 and the forward rotation balancer 200,
When adjusting the reverse rotation balance couple of the reverse rotation balancer 100 or the forward rotation balance couple of the forward rotation balancer 200 by changing the size and installation radius of the thinning holes 06 or 09 of the balancer gear 04 or 07. Are the reverse rotation balancer 100 and the forward rotation balancer 2 as described above.
Due to the regulation of large size and heavy weight of 00, the lightening hole 0
6 or 09, the adjustment range of the installation radius is limited, and it may be difficult to adjust the balancing couple.
There are problems such as.

In view of the above-mentioned prior art, the present invention provides a balancer device for reciprocating internal combustion engines and other reciprocating engines, which has a compact, compact and lightweight balancer device for removing inertial couples, particularly for removing reverse rotational inertial couples. By reducing the installation space, the overall height or width of the engine is reduced, the engine weight is reduced, a compact layout near the front and rear ends of the engine is realized, and the unbalanced couple is adjusted by the balancer device. It is an object of the present invention to provide a balancer device for a reciprocating engine that can facilitate the above.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides, as an invention according to claim 1, an unbalanced force including an inertia couple, which is balanced by a balancer device attached to a rotary shaft including a crankshaft. In the reciprocating engine configured to remove the internal gears, the balancer device includes a sun gear fixed to the rotary shaft and formed with external teeth, and an internal gear formed with unbalanced weight in the circumferential direction. And a ring gear coaxial with the rotating shaft, a plurality of planet gears arranged along the circumferential direction of the rotating shaft and meshing with the outer teeth of the sun gear and the inner teeth of the ring gear, and the planets attached to the case member. A planetary gear type balancer device having a planetary shaft rotatably supporting a gear and configured to remove the unbalanced force by an unbalanced mass provided on the ring gear. Suggest balancer reciprocating engine, wherein the door.

In claim 1, preferably, in the planetary gear type balancer device according to claim 2, in the circumferential direction of the ring gear, a lightening hole is locally formed in the circumferential direction of the ring gear. The mass should be non-uniform. Also, preferably, as described in claim 3,
In the planetary gear type balancer device, a thick wall portion is locally formed in the circumferential direction of the ring gear so that the mass of the ring gear in the circumferential direction is uneven.

The invention according to claims 4 and 5 relates to the installation configuration of the balancer device, and the invention according to claim 4 is the same as claim 1, wherein the planetary gear type balancer device is attached to the shaft end of a crankshaft. Is reversely rotated with respect to the crankshaft, and the reverse rotation component of the inertia couple in the engine is removed by the balancer device.

According to the invention of claim 5, in claim 1,
The planetary gear type balancer device is attached to a shaft end portion of a crankshaft, and the ring gear is reversely rotated with respect to the crankshaft to remove the reverse rotation component of the inertia couple in the engine by the balancer device. A forward rotation balancer is attached to the engine and the forward rotation component of the inertial couple in the engine is removed by the balancer.

According to the invention, when the sun gear of the planetary gear type balancer device mounted on the shaft end of the rotary shaft including the crankshaft rotates forward together with the rotary shaft, the planetary gear meshing with the sun gear reversely rotates and the planetary gear further rotates. An annular ring gear that meshes with the gear with internal teeth is rotated in the reverse direction. In the ring gear, as in claim 2, a lightening hole is locally formed in the circumferential direction, or as in claim 3, a thick portion is locally formed in the circumferential direction to reduce the mass in the circumferential direction. Because of the non-uniform structure, the counter rotation of the engine causes a counterbalancing force including the counterbalance couple due to the formation of the unbalanced mass, and the counterbalance rotation of the engine causes the counterclockwise rotation of the engine. Reverse rotation unbalanced force including inertia couple can be absorbed and removed.

Further, according to a fifth aspect of the present invention, the planetary gear type balancer device removes a reverse rotational inertia couple in the engine, that is, a reverse rotational component of the inertia couple, and a forward rotation balancer for the rotary shaft including the crankshaft. The balancer is mounted to generate a balancing force including a balancing couple due to the unbalanced mass of the balancer, and the balancing force including the balancing couple includes a positive rotation inertia couple of the engine. The positive rotation unbalanced force can be absorbed and removed.

According to the invention, therefore, the reverse rotation balancing including the reverse rotation balancing couple generated by the planetary gear type balancer device coaxial with the rotation shaft attached to the shaft end portion of the rotation shaft including the crankshaft. The force absorbs and removes the reverse rotation imbalance force including the reverse rotation inertia couple of the engine.
Since the normal rotation unbalanced force including the positive rotation inertia couple of the engine can be absorbed and removed by the forward rotation balancer attached to the rotation shaft including the crankshaft, the reverse rotation unbalanced force and the normal rotation of the engine. The unbalanced force can be completely removed by the balancer device installed coaxially with the rotating shaft including the crankshaft.

As a result, the balancer device is smaller and more compact than the prior art in which the reverse rotation balancer and the forward rotation balancer are installed on an axis different from the rotation axis, and the balancer apparatus installation space is reduced. Can be significantly reduced, and the overall height or width of the reciprocating engine can be reduced to realize the downsizing and weight reduction of the engine. Further, as described above, the balancer device can be made compact and compact, so that the installation space of the balancer device can be greatly reduced, which facilitates the layout of the auxiliary machinery in the vicinity of the front end portion and the rear end portion of the engine, and the front end portion It is possible to realize a compact layout of the equipment near the rear part and the rear end part.

Further, according to the present invention, since the outer diameter of the ring gear for generating the counterclockwise counterbalancing force can be increased, and the unbalanced mass adjusting portion such as the lightening hole can be installed in the outer peripheral portion of the ring gear, The adjustment range of the reverse rotation balancing force is expanded, and the adjustment of the reverse rotation balancing force can be facilitated without increasing the size and weight of the device.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless there is a specific description, and are merely illustrative examples. Nothing more.

FIG. 1 is a sectional view of a main part along a crankshaft center line of a planetary gear type balancer device in a diesel engine according to an embodiment of the present invention, and FIG. 2 is a view taken along the line AA of FIG. FIG. 3 is a perspective view of essential parts showing the configurations of the reverse rotation balancer and the forward rotation balancer in the above embodiment. FIG. 4 is an explanatory diagram showing an arrangement configuration of an inertia couple removal balancer device in a diesel engine.

FIG. 4 shows the arrangement of the balancer device in the case where the primary positive rotational inertia couple Mf and the reverse rotational inertia couple Mr remain as unbalanced forces in the diesel engine. In the figure, 1 is the crankshaft of the engine. , 9 is the crankshaft 1
In order to completely remove the positive rotation inertia couple Mf and the reverse rotation inertia couple Mr, the positive rotation balance couple Mf / 2 can be generated at the front end of the crankshaft 1. The rotation balancer 200 and the reverse rotation balancer 100 that can generate the reverse rotation balance couple of Mr / 2 are installed, respectively, and the forward rotation balance couple of Mf / 2 can be generated at the rear end of the crankshaft 1. The forward rotation balancer 200 and the reverse rotation balancer 100 capable of generating the reverse rotation balance couple of Mr / 2 are installed.

FIG. 3 shows the arrangement structure of the reverse rotation balancer 100 and the forward rotation balancer 200 at the front end portion of the crankshaft 1. The crankshaft (sun gear) 2, the planetary gear 3 and the planetary gear 3 are provided at the shaft end portion of the crankshaft 1. Reverse rotation balancer 10 comprising a planetary gear type balancer device having a ring gear 6
0 is provided, and the forward rotation balancer 200 is directly attached to the crankshaft 1 inside the reverse rotation balancer 100. The reverse rotation balancer 100 and the forward rotation balancer 200 are also installed at the rear end of the crankshaft 1 to balance the forward rotation inertia couple Mf and the reverse rotation inertia couple Mr of the engine, and the forward rotation inertia couple Mf. And the reverse rotational inertia couple Mr are completely removed.

1 and 2 showing the details of the reverse rotation balancer 100 comprising the planetary gear type balancer device,
Reference numeral 1 is a crank shaft, and 2 is a crank gear (sun gear) fixed to a shaft end of the crank shaft 1 via a retainer 10 and having external teeth. Reference numeral 6 denotes a ring gear formed in an annular shape and having internal teeth, which is rotatably supported by the case 5 via a bearing 8 concentrically with the crankshaft 1. The ring gear 6 has one or more lightening holes 7 for forming an unbalanced weight (mass) in the circumferential direction near the outer circumference.
Is perforated. The radial position L ₁ of the lightening hole 7,
The inner diameter D ₁ and the number of holes are set according to the magnitude of the reverse rotational inertia couple Mr in the engine.

Further, instead of the lightening hole 7, the holes shown in FIGS.
As indicated by a chain line, the thick portion 7a, which is thicker (thickness t ₂ ) than the other portion (thickness t ₁ ) in the circumferential direction of the ring gear 6, is locally formed, An unbalanced weight (mass) in the circumferential direction of the ring gear 6 may be configured. Radial position L _{2 of} the thick portion 7a, thickness t
₂ and the width are set according to the magnitude of the reverse rotational inertia couple Mr in the engine.

Reference numeral 3 denotes a planetary gear composed of an external gear that meshes with the external teeth of the sun gear and the internal teeth of the ring gear, and as shown in FIG. 2, three planetary gears are provided at equal intervals in the circumferential direction (it may be plural. ), The small-diameter portion 3a meshes with the crank gear, and the large-diameter portion 3b integral therewith meshes with the internal teeth of the ring gear 6 (one tooth is not divided into the small-diameter portion 3a and the large-diameter portion 3b). 2 and the ring gear 6 may be engaged). A planetary shaft 4 is attached to the case 5 and rotatably supports the planetary gears 3.

In the balancer device for a diesel engine having such a structure, the crank gear (sun gear) 2 of the reverse rotation balancer 100 attached to the shaft end portion of the crankshaft 1 rotates forward together with the crankshaft 1 by the rotation of the crankshaft. Then, the plurality of planet gears 3 meshing with the small-diameter portion 3a of the crank gear 2 rotate in the reverse direction, and the annular ring gear 6 meshing with the planet gears 3 with its internal teeth rotates in the reverse direction.

Since the ring gear 6 is constructed so as to make the mass in the circumferential direction non-uniform by locally punching the lightening holes 7 in the circumferential direction as described above, As a result of the rotation, an unbalanced mass due to the formation of the thinned hole 7 or the thick portion 7a as described above generates a reverse rotation balancing couple, and the reverse rotation balancing couple is generated by the engine shown in FIG. The counter rotating inertia couple is removed by balancing with the counter rotating inertia couple.

Further, as shown in FIG. 3, since the forward rotation balancer 200 is mounted inside the reverse rotation balancer 100 of the crankshaft 1, the rotation of the crankshaft 1 and the forward rotation balancer 200 (forward rotation). ) Generates a positive rotation balancing couple with the unbalanced mass of the forward rotation balancer 200, and the positive rotation balancing couple is balanced with the forward rotation inertia couple Mf / 2 of the engine shown in FIG. The positive rotational inertia couple Mf / 2 is removed by.

According to such an embodiment, the reverse rotation of the engine is caused by the reverse rotation balance couple generated by the planetary gear type reverse rotation balancer 100 mounted on the shaft end of the crankshaft 1 and coaxial with the crankshaft 1. Since the inertial couple Mr can be absorbed and removed, and the forward rotation inertial couple Mf of the engine can be absorbed and removed by the forward rotation balancer 200 attached to the crankshaft 1, the reverse rotation inertial couple Mr of the engine can be absorbed. And a counter-rotating balancer 100 and a counter-rotating balancer 2 in which the positive-rotation inertia couple Mf is installed coaxially with the crankshaft 1.
00 enables complete removal. Therefore, the reverse rotation balancer 100 and the forward rotation balancer 20
Since 0 is installed coaxially, the balancer device becomes small and compact, and the installation space for the balancer device is reduced.

Further, according to this embodiment, the outer diameter of the ring gear 6 for generating the counterclockwise counterbalancing force can be increased, and the unbalanced mass of the lightening hole 7 or the thick portion 7a is formed in the outer peripheral portion of the ring gear 6. Since the adjusting unit can be installed, the adjustment range of the reverse rotation balancing force is expanded, and the adjustment of the reverse rotation balancing force can be facilitated without increasing the size and weight of the device.

The reverse rotation balancer 100 and the forward rotation balancer 200 are mounted on rotary shafts other than the crankshaft 1 in the above-described embodiment so that the reverse rotation balance force and the forward rotation balance force by the both balancers are provided to the engine. The reverse rotation unbalanced force and the normal rotation unbalanced force may be balanced.

[0032]

As described above, according to the present invention, the reverse rotation counterbalance force generated by the planetary gear type balancer device mounted on the shaft end portion of the rotary shaft and coaxial with the rotary shaft prevents the reverse rotation of the engine. While absorbing and removing the balancing force,
Since the forward rotation unbalanced force of the engine can be absorbed and removed by the forward rotation balancer attached to the rotating shaft, the reverse rotation unbalanced force and the forward rotation unbalanced force of the engine are installed coaxially with the rotating shaft. It is possible to completely remove it by the balancer device.

As a result, the balancer device is smaller and more compact than the prior art in which the reverse rotation balancer and the forward rotation balancer are installed on an axis different from the rotation axis, and the balancer apparatus installation space is reduced. Can be significantly reduced, and the overall height or width of the reciprocating engine can be reduced to realize the downsizing and weight reduction of the engine. Further, as described above, the balancer device can be made compact and compact, so that the installation space of the balancer device can be greatly reduced, which facilitates the layout of the auxiliary machinery in the vicinity of the front end portion and the rear end portion of the engine, and the front end portion It is possible to realize a compact layout of the equipment near the rear part and the rear end part.

Further, since the outer diameter of the ring gear for generating the counterclockwise counterbalancing force can be increased and an unbalanced mass adjusting section such as a lightening hole can be installed at the outer peripheral portion of the ring gear, counterclockwise counterbalance The force adjustment range is expanded, and the adjustment of the counterclockwise counterbalancing force can be facilitated without increasing the size and weight of the device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts along a crankshaft center line of a planetary gear type balancer device in a diesel engine according to an embodiment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a perspective view of essential parts showing the configurations of a reverse rotation balancer and a forward rotation balancer in the embodiment.

FIG. 4 is an explanatory diagram showing an arrangement configuration of an inertia couple removal balancer device in a diesel engine.

5 is a diagram corresponding to FIG. 2 showing a conventional technique.

[Explanation of symbols]

1 crankshaft 2 Crank gear (Sun gear) 3 planetary gears 4 Planetary axes 5 cases 6 ring gear 7 lightening hole 7a thick part 9 Crankshaft axis 100 Reverse rotation balancer 200 Forward rotation balancer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Numata             3,000 Tana, Sagamihara-shi, Kanagawa Mitsubishi Heavy Industries             General-purpose machine / special vehicle business division

Claims (5)

[Claims] 1. A reciprocating engine configured to balancely remove an unbalanced force including an inertial couple by a balancer device attached to a rotary shaft including a crankshaft,
The balancer device includes a sun gear fixed to the rotary shaft and having external teeth, a ring gear coaxial with the rotary shaft having unbalanced mass in the circumferential direction and having internal teeth, and the rotary shaft. A plurality of planet gears arranged along the circumferential direction of the sun gear and meshing with the outer teeth of the sun gear and the inner teeth of the ring gear, and a planet shaft attached to the case member to rotatably support the planet gears. A balancer device for a reciprocating engine, comprising a planetary gear type balancer device configured to remove the unbalanced force by an unbalanced mass provided in the ring gear. 2. The planetary gear type balancer device is characterized in that a lightening hole is locally formed in the circumferential direction of the ring gear to make the mass of the ring gear non-uniform in the circumferential direction. A balancer device for a reciprocating engine according to Item 1. 3. The planetary gear type balancer device is characterized in that a thick portion is locally formed in the circumferential direction of the ring gear to make the mass of the ring gear non-uniform in the circumferential direction. A balancer device for a reciprocating engine according to Item 1. 4. The planetary gear type balancer device is attached to a shaft end portion of a crankshaft to rotate the ring gear in a reverse direction with respect to the crankshaft, and the balancer device removes a reverse rotation component of an inertial couple in the engine. The balancer device for a reciprocating engine according to claim 1, wherein the balancer device is configured as described above. 5. The planetary gear type balancer device is attached to a shaft end portion of a crankshaft, and the ring gear is reversely rotated with respect to the crankshaft, so that the balancer device removes a reverse rotation component of an inertial couple in the engine. The balancer device for a reciprocating engine according to claim 1, further comprising a balancer for normal rotation attached to the crankshaft, the balancer removing a positive rotation component of an inertial couple in the engine.