JP2013072314A - Oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a constitution for allowing a cylinder head cover and a baffle plate to be reliably adhered to each other without increasing an installation space for an oil separator passage and the weight of the cylinder head cover.SOLUTION: In this oil separator in which the oil separator passage 3 is formed utilizing a space S between the inner surface of the cylinder head cover 1 and the baffle plate of an internal combustion engine integrally joined by vibration welding, the shape of at least a portion of a side wall 14 along the direction the oil separator passage 3 is extended is made a bent shape or a curved shape.

Description

  The present invention relates to an oil separator provided in a cylinder head cover of an internal combustion engine.

  2. Description of the Related Art Conventionally, it is widely known to provide an oil separator passage that connects a crank chamber and an intake passage so that blow-by gas leaked from a gap between a piston and a cylinder is introduced into the intake passage and recombusted. ing. An oil separator is provided in the oil separator passage so as to remove engine oil contained in the blow-by gas and introduce only unburned gas into the intake passage. As an example of such an oil separator, one in which an oil separator passage is formed using a space between an inner surface of a cylinder head cover and a baffle plate is known (see, for example, Patent Document 1). The oil separator described in Patent Document 1 includes a side wall extending in the extending direction of the oil separator passage and an oil drain wall protruding from the side wall, and causes the blow-by gas to meander when the flow of blow-by gas hits the oil drain wall. In addition, the engine oil is removed when blow-by gas hits the oil drain wall.

  Thus, when the inner surface of the cylinder head cover and the baffle plate are joined together by vibration welding, if the wall is vibrated in a direction parallel to the plate surface of the baffle plate and perpendicular to the extending direction of the side wall, the side wall is deformed by vibration and the baffle is deformed. The state where the plate is in close contact with the plate is released, and this side wall may not be bonded to the baffle plate. In order to prevent the occurrence of such a problem, a method of increasing the thickness dimension of the side wall or a method of providing a rib on the side wall to prevent deformation due to vibration can be considered. There arises a new problem that the installation space of the separator passage is increased and the weight of the cylinder head cover is increased.

Japanese Utility Model Publication No.59-110317

  The present invention pays attention to the above points, and realizes a configuration that can securely bond the cylinder head cover and the baffle plate without increasing the installation space of the oil separator passage and the weight of the cylinder head cover. Objective.

  That is, the oil separator according to the present invention is an oil separator in which an oil separator passage is formed using a space between an inner surface of a cylinder head cover of an internal combustion engine and a baffle plate that are integrally joined by vibration welding, It is characterized in that at least a part of the side wall along the extending direction of the passage has a bent or curved shape.

  In such a case, since at least a part of the side wall along the direction in which the oil separator passage extends is bent or curved, most of the part is parallel to the plate surface of the baffle plate and perpendicular to the vibration direction. It can be inclined with respect to the direction. Therefore, the rigidity with respect to the action in the vibration direction of the side wall can be ensured, and the state of being in close contact with the baffle plate is released along with the vibration, and the occurrence of a failure that cannot be welded can be suppressed or prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the structure for making it possible to adhere | attach a cylinder head cover and a baffle plate reliably without the increase in the installation space of an oil separator channel | path and the weight of a cylinder head cover is realizable.

The perspective view which shows the cylinder head cover which concerns on one Embodiment of this invention. The bottom view which shows the cylinder head cover which concerns on the same embodiment. The bottom view which shows the state which attached the baffle plate which concerns on the embodiment to the cylinder head cover. XX sectional drawing in FIG. The figure which shows the oil separator which concerns on the 1st modification of this invention. The figure which shows the oil separator which concerns on the 2nd modification of this invention. The figure which shows the oil separator which concerns on the 3rd modification of this invention. The figure which shows the oil separator which concerns on the 4th modification of this invention. The figure which shows the oil separator which concerns on the 5th modification of this invention. The figure which shows the oil separator which concerns on the 6th modification of this invention. The figure which shows the oil separator which concerns on the 7th modification of this invention.

  An embodiment of the present invention will be described below with reference to the drawings.

  The oil separator according to the present embodiment is formed by using an oil separator passage 3 formed in an internal space S between an inner surface of a cylinder head cover 1 and a baffle plate 2 of an internal combustion engine that are integrally joined by vibration welding. Is.

  As shown in FIGS. 1 to 4, the cylinder head cover 1 is integrally formed of resin as a whole, and has an internal space S that communicates with the crank chamber and is closed by the baffle plate 2. Two oil separator passages 3 are provided therein. Further, the cylinder head cover 1 includes a first side wall 12 having a shape substantially along the outer wall 11, and a first side protruding from the first side wall 12 in a direction orthogonal to the extending direction of the first side wall 12. An oil draining wall 13, a second side wall 14 that faces the first side wall 12 and forms an oil separator passage between the first side wall 12, and the second side wall 14 to the second side wall 14. A second oil drain wall 15 projecting in a direction substantially orthogonal to the extending direction of the side wall 14 and a flange 16 projecting outward from the outer wall 11 are provided. The first side wall 12, the first oil drain wall 13, the second side wall 14, and the second oil drain wall 15 of the cylinder head cover 1 are all connected to the baffle plate 2 at the lower ends thereof. Vibration welded.

  As shown in FIGS. 3 and 4, the baffle plate 2 is in contact with the lower surface of the cylinder head cover 1 and, as described above, the first side wall 12, the first oil drain wall 13, and the second oil drain wall 13. It is vibration welded to the lower end of the side wall 14 and the second oil drain wall 15. Further, the baffle plate 2 is provided with an oil dropping hole 2a for communicating an oil separator passage 3 in the cylinder head cover 1 with a cam chamber (not shown) in the cylinder head. The oil dropping hole 2a is also indicated by an imaginary line in FIG.

  The oil separator passage 3 is formed between the first side wall 12 and the second side wall 14 of the cylinder head cover 1 as described above and as shown in FIGS. It has a labyrinth structure that meanders when the flow of blow-by gas strikes the first oil drain wall 13 or the second oil drain wall 15. Here, in the present embodiment, the second side wall 14 is not parallel to the first side wall 12, but the first bent portion 14 a protruding toward the inner side of the oil separator passage 3 and the outer side of the oil separator passage 3. And a second bent portion 14b protruding toward the front. A part of the second oil drain wall 15 protrudes from the first bent portion 14 a of the second side wall 14 toward the first side wall 12. The oil drop hole 2a of the baffle plate 2 is arranged in the vicinity of the first oil drain wall 13 and the second oil drain wall 15 as shown in FIG.

  Here, when the cylinder head cover 1 and the baffle plate 2 are vibration welded, for example, with the cylinder head cover 1 fixed, the baffle plate 2 is in the short side direction, in other words, the first of the cylinder head cover 1. The cylinder head cover 1 and the baffle plate 2 are welded so as to vibrate along the direction in which the oil drain wall 13 and the second oil drain wall 15 extend. At this time, since many portions of the second side wall 14 are linear in bottom view connecting the first bent portion 14a and the second bent portion 14b, the angle with respect to the vibration direction is not 90 °, and therefore vibration While performing the welding operation, the state of hanging from the top wall 10 of the cylinder head cover 1 is maintained. Further, the first side wall 12 acts as a rib for the first oil draining wall 13 to suppress the significant vibration of the first side wall 12, so that the cylinder head cover 1 can be removed during the vibration welding operation. The state of hanging from the top wall 10 is maintained.

  As described above, according to the structure of the oil separator according to the present embodiment, the second side wall 14 that is one of the walls along the direction in which the oil separator passage 3 is formed and the oil separator passage 3 extends is provided. Many portions are bent and inclined with respect to a direction parallel to the plate surface of the baffle plate 2 and perpendicular to the vibration direction. Therefore, the rigidity with respect to the action of the vibration direction of the second side wall 14 can be ensured, and the state of being in close contact with the baffle plate 2 is released along with the vibration, and the occurrence of a failure that cannot be welded can be suppressed or prevented. Therefore, a special structure such as a rib for suppressing the vibration of the second side wall 14 can be omitted, and the weight of the cylinder head cover 1 can be reduced and, consequently, the cost can be reduced.

  Further, since the flow of blow-by gas flowing through the oil separator passage 3 substantially follows the second side wall 14, the second side wall 14 can be used as a guide wall for guiding the flow of blow-by gas. Accordingly, the flow resistance of the blow-by gas can be reduced, and the oil separator passage 3 can be reduced in size and the installation space of the oil separator passage 3 can be reduced.

  In addition, the second side wall 14 protrudes in the direction toward the first side wall 12 from the first bent portion 14a, which is the portion that protrudes most inside the oil separator passage, and the second oil cut wall 15 is provided. Therefore, the flow of blow-by gas can be applied to the second oil drain wall 15 vigorously, and therefore the oil drain performance can be improved.

  The present invention is not limited to the embodiment described above.

  For example, as a first modification, as shown in FIG. 5, while forming the side walls A12 on both sides forming the oil separator passage A3 so that the width of the oil separator passage A3 is substantially constant, the side walls on both sides are formed. A cylinder head cover may be formed so that A12 has a bent portion. In this modification, two oil separator passages A3 are adjacent to each other in the width direction, and one side wall of these adjacent oil separator passages A3 is shared. The side walls A12 include a first bent portion A12a that protrudes to one side with respect to the direction in which the oil separator passage A3 extends, and a second bent portion that protrudes to the other side with respect to the direction in which the oil separator passage A3 extends. A12b. Further, from the side of the first bent portion A12a and the second bent portion A12b that protrudes toward the inside of the separator passage A3, the oil drain wall A13 is protruded in the direction of protruding into the separator passage A3. Provided. On the other hand, an oil dropping hole A2a is provided in a portion of the baffle plate (not shown) adjacent to the first bent portion A12a. In FIG. 5, the oil pit A2a is indicated by an imaginary line. In this modification, a baffle plate (not shown) is struck against the lower ends of the side wall A12 and the oil drain wall A13 so that the baffle plate vibrates in the longitudinal direction of the oil drain wall A13 with the cylinder head cover fixed. The cylinder head cover and the baffle plate are welded. According to this configuration, not only can the most main effects of the present invention described above be obtained, but also the area of the separator passage can be reduced while ensuring the width of the blow-by gas flow path, so that space can be used effectively. Can do. Furthermore, since the flow of blow-by gas substantially follows the direction in which the side wall A12 extends, the side wall A14 can be used as a guide wall for guiding the flow of blow-by gas. In addition, the side wall A12 is the portion that protrudes most inside the oil separator passage A3, that is, the oil cut wall A13 protrudes inside the oil separator passage A3 from the side where the bent portion A12a protrudes inside the oil separator passage A3. Therefore, the flow of blow-by gas can be applied to the oil drain wall A13 vigorously, and therefore the oil drain performance can be improved. In addition, since the oil drop hole A2a is provided in a portion adjacent to the first bent portion A12a of the baffle plate (not shown), in other words, a portion facing the oil drain wall A13, the inclination of the side wall A12 is utilized. Oil in blow-by gas can be collected more efficiently for oil removal.

  Further, as a second modified example, as shown in FIG. 6, the side walls B12 on both sides of the oil separator passage B3 have first bent portions B12a projecting inward of the separator passage B3 and outward of the separator passage B3. And a cylinder head cover formed so that the first bent portions B12a and the second bent portions B12b face each other. In this modification, an oil drain wall B13 extending in a direction orthogonal to the direction in which the oil separator passage B3 extends is provided at a position where the distance between the side walls B12 on both sides, that is, the width of the oil separator passage B3 is maximum. . In this modification, a baffle plate (not shown) is struck against the lower ends of the side wall B12 and the oil drain wall B13 so that the baffle plate vibrates in the longitudinal direction of the oil drain wall B13 with the cylinder head cover fixed. The cylinder head cover and the baffle plate are welded. Even with such a configuration, not only can the most important effects of the present invention described above be obtained, but also the area of the oil separator passage B3 can be reduced while ensuring the width of the flow path of the blow-by gas, so space is effectively used. Can be used.

  As a third modified example, as shown in FIG. 7, a cylinder head cover may be formed so that the side wall C12 forming the oil separator passage C3 is smoothly curved while keeping the width of the oil separator passage C3 constant. It is done. In this modification, an oil draining wall C13 is provided so as to protrude from both walls C12 forming the passage toward the inside of the oil separator passage D3. In this modification, a baffle plate (not shown) is struck against the lower ends of the side wall C12 and the oil drain wall C13 so that the baffle plate vibrates in the longitudinal direction of the oil drain wall C13 with the cylinder head cover fixed. The cylinder head cover and the baffle plate are welded. Even with such a configuration, many portions of the side wall C12 are inclined with respect to the direction parallel to the plate surface of the baffle plate (not shown in FIG. 7) and perpendicular to the vibration direction. The effect, that is, the rigidity with respect to the action in the vibration direction of the side wall C12 constituting the oil separator passage C3 can be secured, and the state of being in close contact with the baffle plate is released with the vibration, and the occurrence of the failure that cannot be welded can be suppressed or prevented. it can.

  As a fourth modified example, as shown in FIG. 8, a cylinder is formed so that a plurality of curved wall elements D121 projecting outward at the intermediate portion are connected to form side walls D12 on both sides forming an oil separator passage D3. A head cover can be considered. The side walls D12 on both sides are arranged such that the middle portion in the longitudinal direction of the wall element D121 of one side wall D12 and the boundary portion between the wall elements D12 on the other side wall face each other. In this modification, the oil draining wall D13 is provided so as to protrude into the passage from a portion where the wall element D121 protrudes inward, that is, a boundary portion between the adjacent wall elements D121. In this modified example, a baffle plate (not shown) is struck against the lower ends of the side wall D12 and the oil drain wall D13 so that the baffle plate vibrates in the longitudinal direction of the oil drain wall D13 with the cylinder head cover fixed. The cylinder head cover and the baffle plate are welded. Even with such a configuration, many portions of the wall element D121 are inclined with respect to the direction parallel to the plate surface of the baffle plate and perpendicular to the vibration direction, so the main effect of the present invention, that is, the oil separator passage D3. The rigidity with respect to the action in the vibration direction of the side wall D12 that constitutes can be secured, the state of being in close contact with the baffle plate is released with vibration, and the effect that the occurrence of a failure that cannot be welded can be suppressed or prevented can be realized. Furthermore, according to such a configuration, since the shape of the wall element D121 is in line with the actual flow of blow-by gas, the flow resistance of the oil separator passage D3 is reduced, and the crankroom is more efficiently ventilated. It can be carried out.

  As a fifth modified example, as shown in FIG. 9, a cylinder head cover is formed so as to form a side wall E12 that forms an oil separator passage E3 by connecting a plurality of curved wall elements E121 projecting inward at an intermediate portion. What was constructed can be considered. In this modified example, an oil draining wall E13 is provided so as to protrude into the passage from a portion where the wall element E121 protrudes inward, that is, a central portion in the longitudinal direction of the wall element E121. In this modified example, a baffle plate (not shown) is struck against the lower ends of the side wall E12 and the oil drain wall E13 so that the baffle plate vibrates in the longitudinal direction of the oil drain wall E13 with the cylinder head cover fixed. The cylinder head cover and the baffle plate are welded. According to such a configuration, the location where the flow of the blow-by gas separates from the wall element F121 can be brought close to the oil drain wall F121, and the flow of the blow-by gas can be vigorously collided with the oil drain wall F121. Oil can be removed from blow-by gas.

  Further, as a sixth modified example, as shown in FIG. 10, while keeping the width of the oil separator passage F3 constant, the portion inclined to the left or right with respect to the extending direction of the oil separator passage F3 and the other is inclined. It is conceivable to provide an oil drain wall F13 that protrudes in a direction from the side wall F12 toward the inside of the oil separator passage F3.

  In addition, as a seventh modified example, as shown in FIG. 11, while keeping the width of the oil separator passage G3 constant, a portion inclined to either the left or right with respect to the extending direction of the oil separator passage G3 and the other An oil cut wall G13 is provided which has side walls G12 having alternately curved portions and a smooth curved surface whose inner surface is continuous, and protrudes from the side walls G12 toward the inside of the oil separator passage F3. Embodiments are contemplated.

  Also in the sixth and seventh modified examples, a baffle plate (not shown) is abutted against the lower ends of the side walls F12, G12 and the oil draining walls F13, G13, and the baffle plate is fixed to the oil draining wall with the cylinder head cover fixed. It vibrates in the longitudinal direction of F13 and G13, and the cylinder head cover and the baffle plate are welded.

  Also with the configurations of these sixth and seventh modified examples, the main effect of the present invention, that is, the rigidity with respect to the action in the vibration direction of the side walls F12 and G12 constituting the oil separator passages F3 and G3 can be secured, and the baffle is accompanied by the vibration. The state of being in close contact with the plate is released, and the effect of suppressing or preventing the occurrence of defects that cannot be welded can be realized.

  Note that, in the first to seventh modifications described above, portions other than those shown in the drawings have the same configuration as that of the above-described embodiment, and thus the description thereof is omitted.

  In addition, various modifications may be made without departing from the spirit of the present invention.

1 ... Cylinder head cover 2 ... Baffle plate 3 ... Oil separator passage

Claims (1)

An oil separator in which an oil separator passage is formed by utilizing a space between an inner surface of a cylinder head cover of an internal combustion engine and a baffle plate joined together by vibration welding,
An oil separator characterized in that at least a part of a side wall along a direction in which the oil separator passage extends is bent or curved.

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