JP5088300B2 - Internal combustion engine with piston-type balancer - Google Patents

Description

  The present invention relates to an internal combustion engine including a piston type balancer.

  Conventionally, for example, Patent Document 1 discloses an engine with a reciprocating balancer. In this conventional engine, the reciprocating motion of a rod (balancer piston) that reciprocates in a guide cylinder (balancer liner) is used as an oil pump or a fuel pump. In this conventional technique, the reciprocating balancer mechanism is applied to an inclined engine in which a cylinder protrudes obliquely upward from a crank chamber.

JP 2004-293363 A

  As in the engine described in Patent Document 1 described above, in an internal combustion engine having a piston type balancer, in addition to friction generated by sliding an in-cylinder piston and a cylinder liner disposed in a cylinder of the internal combustion engine. Friction is generated by the sliding of the balancer piston and the balancer liner. For this reason, the friction as the whole internal combustion engine increases with respect to the internal combustion engine which does not include such a balancer piston.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an internal combustion engine including a piston-type balancer that can satisfactorily reduce the friction associated with the reciprocating motion of the balancer piston.

1st invention is an internal combustion engine provided with a piston type balancer,
A balancer piston that reciprocates opposite to an in-cylinder piston disposed in a cylinder of the internal combustion engine;
A balancer liner installed on the outer periphery of the balancer piston,
The balancer piston is provided with a roller that rolls on the balancer liner,
The reciprocating motion of the balancer piston is guided by the balancer liner through the rollers ,
The internal combustion engine is mounted on a vehicle such that the axis of the balancer piston is inclined with respect to the vertical direction,
The roller is disposed on the balancer piston on the side surface on the vertically lower side and the side surface on the opposite side, with the center of the balancer piston in between.
The number of the rollers arranged on the side surface on the vertically lower side is larger than the number of the rollers arranged on the opposite side surface.

The second invention is an internal combustion engine including a piston type balancer,
A balancer piston having a roller which reciprocates opposite to an in-cylinder piston disposed in a cylinder of the internal combustion engine, and has a roller whose rolling direction coincides with the direction of the reciprocating motion on a side surface;
A guide member installed on the outer periphery of the balancer piston and having a guide groove for guiding the roller;
Equipped with a,
The internal combustion engine is mounted on a vehicle such that the axis of the balancer piston is inclined with respect to the vertical direction,
The roller is disposed on the balancer piston on the side surface on the vertically lower side and the side surface on the opposite side, with the center of the balancer piston in between.
The number of the rollers arranged on the side surface on the vertically lower side is larger than the number of the rollers arranged on the opposite side surface.

  According to the first aspect, the balancer piston and the balancer liner do not slide directly, but a rolling motion is performed between the roller and the balancer liner. For this reason, it is possible to satisfactorily reduce the friction when the balancer piston reciprocates as compared with the case where the balancer piston and the balancer liner slide directly.

  According to the second invention, when the balancer piston reciprocates, the roller rolls in the guide groove of the guide member. For this reason, it is possible to satisfactorily reduce the friction when the balancer piston reciprocates as compared with the case where the balancer piston and the balancer liner slide directly. Further, according to the present invention, when the balancer piston reciprocates, it is only necessary to install a guide member only in the peripheral portion of the roller, so that the parts can be significantly reduced in weight. Further, by using such a guide member as a member that guides the balancer piston, the heat capacity can be reduced as compared with the case where a balancer liner formed in a cylindrical shape is provided, and the warm-up performance of the internal combustion engine is improved. be able to.

Embodiment 1 FIG.
First, Embodiment 1 of the present invention will be described with reference to FIG.
FIG. 1 is a diagram for explaining a characteristic configuration of an internal combustion engine including a piston type balancer according to a first embodiment of the present invention. More specifically, FIG. 1 (A) is a view of the balancer piston 10 as viewed from the top surface direction, and FIG. 1 (B) is a view of the balancer piston 10 as viewed from the side surface direction.

  As shown in FIG. 1, the internal combustion engine provided with the piston type balancer of the present embodiment includes a balancer piston 10 that reciprocates opposite to an in-cylinder piston (not shown) disposed in the cylinder. A balancer liner 12 formed in a cylindrical shape is installed on the outer periphery of the balancer piston 10. More specifically, the balancer piston 10 is configured to reciprocate within the balancer liner 12 in the direction indicated by the arrow A in FIG. 1B as the crankshaft (not shown) rotates. Yes.

  The balancer piston 10 is provided with a roller 14 that rolls on the inner peripheral surface of the balancer liner 12. The rolling direction of the roller 14 is set to coincide with the reciprocating direction of the balancer piston 10 (the direction of arrow A in FIG. 1). In this embodiment, the reciprocating motion of the balancer piston 10 is guided by the balancer liner 12 through such a roller 14.

  By the way, when the internal combustion engine is mounted on the vehicle so that the axis of the balancer piston 10 is inclined with respect to the vertical direction, a thrust load is applied to the side surface of the balancer piston 10 on the vertical downward side by the weight of the balancer piston 10. Will act. Here, the left side in FIG. 1 with respect to the axis of the balancer piston 10 is referred to as “thrust side” on which the thrust load acts, and the opposite side is referred to as “anti-thrust side”.

  As shown in FIG. 1, two rollers 14 are provided on the thrust side, ie, two rollers per row. Similarly, on the anti-thrust side, one row is provided in the number of two per row. In this way, the rollers 14 are installed on both sides so that the center of the balancer piston 10 is sandwiched therebetween, and the number of rollers 14 arranged on the thrust side on which a larger load acts is set to be larger. ing.

  According to the configuration described above with reference to FIG. 1, the balancer piston 10 and the balancer liner 12 do not slide directly, but a rolling motion is performed between the roller 14 and the balancer liner 12. It becomes like this. For this reason, compared with the case where the balancer piston 10 and the balancer liner 12 slide directly, it becomes possible to reduce the friction when the balancer piston 10 reciprocates.

  Further, when the configuration of the present embodiment is adopted, the material of the roller 14 that is in contact with the balancer liner 12 can be arbitrarily changed from the material of the balancer piston 10, so that the strength and mass with respect to the thrust load can be increased. Optimization design becomes easy.

  Further, since the rolling motion of the roller 14 is generally looser than the sliding motion between the surfaces, the design of the lubrication system is facilitated by adopting the configuration of the present embodiment.

Embodiment 2. FIG.
Next, Embodiment 2 of the present invention will be described with reference to FIG.
FIG. 2 is a view for explaining a characteristic configuration of the internal combustion engine including the piston balancer according to the second embodiment of the present invention. More specifically, FIG. 2A is a view of the balancer piston 10 viewed from the top surface direction, and FIG. 2B is a view of the balancer piston 10 viewed from the side surface direction. In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIG. 2, also in this embodiment, the balancer piston 10 is provided with a roller 14 as in the first embodiment described above. In addition, in this embodiment, a roller guide having a guide groove 16a for guiding the roller 14 is used as a member for guiding the rolling of the roller 14 accompanying the reciprocating motion of the balancer piston 10 in place of the balancer liner 12 formed in a cylindrical shape. 16 is provided. More specifically, as shown in FIG. 2, the roller guide 16 is formed in a rail shape, and corresponds to each row of the rollers 14 arranged in two rows on the thrust side and one row on the anti-thrust side. Are provided.

  According to the configuration described above with reference to FIG. 2, when the balancer piston 10 reciprocates, the roller 14 rolls in the guide groove 16 a of the roller guide 16. For this reason, compared with the case where the balancer piston 10 and the balancer liner 12 slide directly, it becomes possible to reduce the friction when the balancer piston 10 reciprocates. Further, since the roller 14 rolls while being inserted into the guide groove 16a, the roller guide 16 allows the balancer piston 10 to reciprocate while preventing the balancer piston 10 from moving during reciprocation. You will be guided.

  According to the configuration of the present embodiment, it is only necessary to install the roller guide 16 in the peripheral portion of the roller 14 on the thrust side and the anti-thrust side, so that the parts can be significantly reduced in weight. Further, since the roller guide 16 has an overwhelmingly smaller heat capacity than the balancer liner 12 of the first embodiment, it is possible to improve the warm-up property of the internal combustion engine.

  In addition, the roller guide 16 can be produced at a lower cost than the balancer liner 12 that requires precise finishing (boring and honing). Further, serviceability such as repair and replacement is improved as compared with the balancer liner 12. In addition, even if the diameter of the balancer piston 10 and further the thrust side load and the anti-thrust side load are different, it is possible to cope with it only by changing the position and number of the roller guides 16. For this reason, parts can be shared in engines of various specifications.

  In the second embodiment described above, the roller guide 16 corresponds to the “guide member” in the second invention.

It is a figure for demonstrating the characteristic structure of an internal combustion engine provided with the piston type balancer of Embodiment 1 of this invention. It is a figure for demonstrating the characteristic structure of an internal combustion engine provided with the piston type balancer of Embodiment 2 of this invention.

Explanation of symbols

10 balancer piston 12 balancer liner 14 roller 16 roller guide 16a guide groove

Claims (2)

A balancer piston that reciprocates opposite to an in-cylinder piston disposed in a cylinder of the internal combustion engine;
A balancer liner installed on the outer periphery of the balancer piston,
The balancer piston is provided with a roller that rolls on the balancer liner,
The reciprocating motion of the balancer piston is guided by the balancer liner through the rollers ,
The internal combustion engine is mounted on a vehicle such that the axis of the balancer piston is inclined with respect to the vertical direction,
The roller is disposed on the balancer piston on the side surface on the vertically lower side and the side surface on the opposite side, with the center of the balancer piston in between.
An internal combustion engine comprising a piston-type balancer, wherein the number of the rollers arranged on the side surface on the vertically lower side is larger than the number of the rollers arranged on the opposite side surface. A balancer piston having a roller which reciprocates opposite to an in-cylinder piston disposed in a cylinder of the internal combustion engine, and has a roller whose rolling direction coincides with the direction of the reciprocating motion on a side surface;
A guide member installed on the outer periphery of the balancer piston and having a guide groove for guiding the roller;
Equipped with a,
The internal combustion engine is mounted on a vehicle such that the axis of the balancer piston is inclined with respect to the vertical direction,
The roller is disposed on the balancer piston on the side surface on the vertically lower side and the side surface on the opposite side, with the center of the balancer piston in between.
An internal combustion engine comprising a piston-type balancer, wherein the number of the rollers arranged on the side surface on the vertically lower side is larger than the number of the rollers arranged on the opposite side surface.

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