JP2017180106A - Head cover device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent that an oil mist is integrated with a water component, becomes creamy, and adheres to a lower face of an oil filler cap.SOLUTION: A VVT 9 is fixed to a front end part of an intake valve cam shaft 6. An oil inlet 3 is formed at an upper part of a region which is sandwiched by an extension line of the intake valve cam shaft 6 and an extension line of an exhaust valve cam shaft 7. A guide plate 12 for reflecting (returning) an oil spray which is scattered by the VVT 9 toward the oil inlet 3 is arranged at a baffle plate 2 for air-liquid separating a blowby gas. A conical part 13 for enhancing an adhesion property (collection property) of the oil spray is arranged at a lower face of an oil filler cap 4. The conical part 13 gets wet by the oil spray, an oil layer becomes an oil droplet and is dripped, and thereby the oil mist is not grown creamy even if adhering to the conical part. The guide plate 12 and the conical part 13 can be selectively employed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a head cover device fixed to a cylinder head of an internal combustion engine, and more particularly to a head cover device in which an oil inlet that is closed by an oil filler cap is provided in the head cover.

  Providing an oil injection port in the head cover is widely performed, and in this case, the oil injection port is often provided at the end (front end) of the head cover on the timing chain side. However, in the space between the cylinder head and the cylinder head, since the fine oil mist generated by the circulation of the timing chain is floating in the front part, when an oil injection port is provided at the front end part of the head cover, There is a phenomenon that the oil mist becomes cloudy in the form of cream or foam and adheres to the lower surface of the oil filler cap, etc.If the oil filler cap is removed during oil replacement or maintenance, the cloudy oil mist will touch the human eye and There was a case of feeling uncomfortable or uneasy.

  In this regard, Patent Document 1 filed by the applicant of the present application discloses that the head cover is provided with a reinforcing rib that prevents oil mist from moving toward the oil injection port.

JP 2010-59936 A

  According to Patent Document 1, since oil mist is prevented from adhering to the oil inlet, white oil does not adhere to the lower surface of the oil filler cap, but a reinforcing rib is provided depending on the location of the oil inlet. In this case, the cloudy oil mist cannot be prevented from adhering to the lower surface of the oil filler cap.

  The present invention has been made to improve the current situation.

In the present invention, an oil injection port closed with an oil filler cap is formed in a head cover fixed to the upper surface of the cylinder head, and the oil injection port is shaken off by a rotating body provided in the cylinder head. It is a configuration arranged above the part where the oil splashes are scattered,
The head cover or the oil filler cap is provided with guide means for promoting the oil splash to adhere to the lower surface portion of the oil filler cap.

  The guide means may be provided on the head cover, provided on the oil filler cap itself, or provided on both the head cover and the oil filler cap. Specifically, when the oil mist can be scattered to the lower surface of the oil filler cap, the oil mist can be adhered by forming the lower surface of the oil filler cap in a wide area such as a conical shape.

  Further, there are many structures in which a baffle plate is provided inside the head cover main body. In this case, the guide means may be provided on the head cover main body or on the baffle plate. Furthermore, whether it is provided on the head cover main body or on the baffle plate, both the case where it is integrally formed and the case where another member is fixed are included. The same applies to the oil filler cap.

  If the oil mist does not reach the bottom of the oil filler cap, the guide means may be provided on the head cover, and this guide means is structured to reflect the oil mist scattered by the centrifugal force of the rotating body toward the oil inlet. Good.

  If fine oil mist continuously adheres to the lower surface of the oil filler cap, it grows with the condensed moisture, and thus becomes cloudy and has a creamy or foamy appearance. Since many oil droplets adhere, even if oil mist adheres, it will be washed away by the droplets, and therefore a phenomenon in which an infinite number of oil mists grow into a cream can be prevented.

  Therefore, in the present invention, the lower surface of the oil filler cap is simply wetted with oil, and even if the oil filler cap is removed during oil replacement or the like, there is no sense of incongruity or anxiety.

  Whether the guide means is provided on the head cover or the oil filler cap may be selected in accordance with the actual situation such as the position of the oil filler cap and the direction in which the oil splashes. In short, if it is difficult to provide guide means on the head cover due to space problems, the guide means may be provided on the oil filler cap, and vice versa. When both can be adopted, they may be provided only on one side or on both sides.

It is a bottom view of an embodiment. It is the II-II sectional view taken on the line of FIG. (A) is a cross-sectional view taken along the line IIIA-IIIA in FIGS. 1 and 2, (B) is a view with the same structure as (A) and a normal type oil filler cap attached, and (C) is another oil filler cap. It is an example figure.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, the word “front” is used to indicate the direction, but it follows the general name of an internal combustion engine, and the front side in the direction of the crankshaft and where the timing chain and auxiliary equipment are arranged. It is said.

(1). Overview As shown in FIG. 2, the head cover device closes the head cover main body 1 constituting the appearance, the baffle plate 2 mounted inside the head cover main body 1, and the oil inlet 3 formed in the head cover main body 1. An oil filler cap 4 is provided. The baffle plate 2 is attached to the head cover main body 1 over a wide range, and although not shown in FIG. 2, the oil component is collected from the blow-by gas between the head cover main body 1 and the baffle plate 2. A blow-by gas passage is formed.

  FIG. 1 is a bottom view of the head cover device, and shows the front portion of the cylinder head 5, the intake valve cam shaft 6, and the exhaust valve cam shaft 7. FIG. Both camshafts 6 and 7 are exposed in front of the cylinder head 5, and chain sprockets 8 around which timing chains (not shown) are wound are respectively fixed to the exposed portions. Further, a VVT (variable valve timing device) 9 located outside the chain sprocket 8 is provided in the exposed portion of the intake valve cam shaft 6, and the VVT 9 rotates together with the cam shaft 6. In the present embodiment, VVT 9 is an example of a rotating body.

  About half of the oil injection port 3 protrudes forward from the front end surface of the head cover main body 1. Therefore, the axis of the oil filler cap 4 is located in the vicinity of the front end of the head cover body 1. A lower portion of the oil injection port 3 is a tapered portion 10 having a diameter reduced downward.

  As shown in FIG. 3 (A), a front cover 11 surrounding the timing chain and the chain sprocket 8 is fixed to the front surface of the cylinder head 5 (and the cylinder block), and the oil poured from the oil inlet 3 Flows down into a space surrounded by the front cover 11, the cylinder head 5 and the cylinder block, and reaches the oil pan.

  As shown in FIGS. 1 and 2, the oil injection port 3 is an exhaust gas in a portion between the extension lines of the intake valve cam shaft 6 and the exhaust valve cam shaft 7 in a bottom view (and a plan view). The upper end of the timing chain circulates from the intake valve chain sprocket 8 to the exhaust valve chain sprocket 8 because it is arranged at a portion close to the extension line of the valve camshaft 7. The oil adhering to the outer end surface is scattered toward the lower portion of the oil injection port 3 by centrifugal force.

(2). Guide means Therefore, as an example of the guide means described in the claims, a guide plate 12 is provided at the end of the baffle plate 2 to reflect the oil splash shaken by the VVT 9 to the oil injection port 3 side. In addition, the oil filler cap 4 is also provided with a downwardly conical conical portion 13 as an example of the guide means described in the claims (may be trapezoidal). The oil filler cap 4 has a flange 4a, a knob 4b, and a fitting portion 4c, and a conical portion 13 is provided integrally or as a separate member on the fitting portion 4c.

  As shown by a group of small dots in FIGS. 2 and 3A and 3B, fine oil mist generated mainly by the circulation of the timing chain is floating in the front portion of the inside of the head cover device. This flows upward on the air flow generated by the circulation of the timing chain and adheres to the lower surface of the oil filler cap 4. If no measures are taken, the oil mist is accumulated in a cloudy state integrated with the moisture condensed on the lower surface of the oil filler cap 4 and grows until it has a foamy or creamy appearance. Go.

  Accordingly, in the present embodiment, as shown by arrows in each drawing, the oil splash shaken off by the centrifugal force of VVT 9 scatters toward the conical portion 13 of the oil filler cap 4 via the guide plate 12. The conical portion 13 of the oil filler cap 4 is wet with the oil layer, and the oil layer becomes an oil droplet and drops downward with the passage of time. Even if the oil mist adheres to the conical portion 13, the oil mist is absorbed by the oil layer and drops downward. Therefore, the phenomenon in which the conical portion 13 is covered with the oil mist that becomes cloudy does not occur. As a result, when the oil filler cap 4 is removed at the time of oil exchange or the like, the person does not feel uncomfortable or uneasy.

  In FIG. 3B, the normal type oil filler cap 4 that does not include the conical portion 13 is displayed, but in this case, the same effect as described above is obtained. When it is difficult to provide the guide plate 12 or when a considerable amount of oil splashes near the lower surface of the oil filler cap 4, only the conical portion 13 is provided on the oil filler cap 4 as a guide means. May be adopted.

  When only the conical portion 13 is provided on the oil filler cap 4 as the guide means, it is preferable to reduce the cone angle and increase the downward projecting dimension as shown in FIG. Yeah. That is, it can be said that it is preferable to make the adhesion area of the oil splash as large as possible. When the guide plate 12 is provided on the baffle plate 2 as in the present embodiment, the baffle plate 2 as a necessary part of the head cover device is used, so that the problem of an increase in the number of assembly steps does not occur.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, the guide portion can be provided not on the baffle plate but on the head cover body, and a plurality of guide portions can be provided. A chain sprocket can also be used as the rotating body. That is, the oil splash shaken off by the chain sprocket may be redirected directly or by the guide portion and directed toward the lower surface of the oil filler cap.

  The present invention can be embodied in a head cover device. Therefore, it can be used industrially.

1 Head cover body 2 Baffle plate 3 Oil inlet 4 Oil filler cap 5 Cylinder head 6, 7 Cam shaft 8 Chain sprocket 9 VVT as an example of rotating body
12 Guide plate (reflecting plate, warping plate) as an example of guide means
13 Conical part as an example of guide means

Claims (1)

An oil injection port closed with an oil filler cap is formed in a head cover fixed to the upper surface of the cylinder head, and the oil injection port receives oil splashes scattered by a rotating body provided in the cylinder head. It is a configuration arranged above the part to be scattered,
The head cover or the oil filler cap is provided with guide means for promoting the oil splash to adhere to the lower surface portion of the oil filler cap.
A head cover device for an internal combustion engine.

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