JP3903926B2 - Engine accessory mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine accessory mounting structure for an engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an engine accessory, such as an alternator, is driven by an engine via a timing belt, and is therefore attached to a side surface of a cylinder head or a cylinder block adjacent to the front side of the engine where the timing belt is disposed.
[0003]
For example, in Patent Document 1 below, a mounting boss portion is formed on each of an intake side cylinder head and a cylinder block adjacent to the front side of the engine, and an alternator is attached by fastening a fastening bolt to the mounting boss portion. In order to ensure the supporting rigidity, it is disclosed that reinforcing ribs are formed in the vicinity of the mounting bosses.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 4-100047 gazette
[Problems to be solved by the invention]
As in the prior art described above, when the alternator is mounted, a reinforcing rib is formed in the vicinity of the alternator mounting boss portion in order to ensure the supporting rigidity.
[0006]
However, in recent years, further improvements in fuel efficiency have been achieved due to environmental considerations, and the engine has been reduced in weight as one of the countermeasures. However, the reinforcing ribs described above are contrary to the reduction in weight. It is desirable not to form as much as possible.
[0007]
By the way, various oil passages are formed in the cylinder head. These oil passages are lubrication oil passages for supplying oil to sliding portions of the respective members in the cylinder head, intake valves and exhausts by hydraulic pressure. It comprises an oil passage for a variable valve mechanism for supplying oil to a hydraulic variable valve mechanism that changes valve opening / closing timing and lift amount.
[0008]
Usually, such an oil passage is formed by drilling from the side surface of the cylinder head into the cylinder head, and a boss is formed at the periphery of the opening of the oil passage, and the opening is formed by a plug member. Blocked.
[0009]
And since such a boss | hub part is thick, it has high rigidity and can be functioned as a reinforcement member.
[0010]
Therefore, as a result of earnest research, the present applicant has been able to improve the rigidity of the alternator mounting boss without providing a dedicated reinforcing rib by using such a plug member mounting boss, and the alternator support rigidity. The knowledge which can improve was discovered.
[0011]
The present invention has been made in consideration of the above-described problems. The purpose of the present invention is to use the plug member mounting boss portion of the oil passage, thereby providing the alternator mounting boss portion without providing a dedicated reinforcing rib. An object of the present invention is to provide an engine accessory mounting structure capable of improving rigidity and improving the mounting rigidity of an alternator .
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the following solution as a solution. That is, in the first configuration of the present invention, an exhaust manifold mounting flange to which an exhaust manifold is mounted is formed on the exhaust side longitudinal side surface of the cylinder head extending in the same direction as the cylinder arrangement direction, and the exhaust side longitudinal direction of the cylinder head is formed. Forming an alternator mounting boss at one side on the side of the engine than the exhaust manifold mounting flange, and two on the exhaust side longitudinal side of the cylinder block disposed below the cylinder head; An engine accessory mounting structure in which a fastening bolt is fastened to an alternator mounting boss portion and the alternator is mounted across the exhaust side longitudinal side surface of the cylinder head and the exhaust side longitudinal side surface of the cylinder block ,
An opening on one end side of the oil passage extending in the same direction as the engine front side is formed at a position on the exhaust side longitudinal side surface of the cylinder head and in the vicinity of the alternator mounting boss portion on the cylinder head side. ,
A plug member mounting boss portion on which a plug member for closing the opening portion is mounted is formed on the periphery of the opening portion on one end side of the oil passage.
The cylinder head side alternator mounting boss part is formed continuously so as to partially overlap the plug member mounting boss part, and is aligned with the plug member mounting boss part in the piston axial direction. The plug member mounting boss is arranged on the lower side in the piston axial direction than the plug member mounting boss .
[0013]
According to the first configuration of the present invention, the oil passage is arranged close to the alternator mounting boss portion , and the plug member mounting boss portion and the alternator mounting boss portion are continuously formed. The strength of the alternator mounting boss portion can be improved by utilizing the member mounting boss portion, and the support rigidity of the alternator can be improved without forming a dedicated reinforcing rib.
[0014]
When forming continuously two boss portions of the upper above, of simply connecting each boss portion positioned away requires paddings for the coupling, while the would be contrary to the weight of the engine If the thickness for connecting is too small, the strength of the alternator mounting boss cannot be sufficiently improved.
[0015]
According to the first configuration of the present invention, the boss for attaching the alternator is formed so as to overlap the boss for mounting the plug member, so that both the bosses can be formed continuously without providing any meat. It is possible to improve the support rigidity of the alternator mounting boss portion .
[0016]
Normally, the cylinder block exhaust side longitudinal sides, spaces to afford, it is possible to form only the alternator mounting boss number considering the supporting rigidity of the alternator, the cylinder head exhaust side longitudinal side the, for exhaust manifold is mounted, the space to not afford, it may be difficult to form a large amount of alternator mounting boss portion.
[0017]
Therefore, when the number of alternator mounting bosses formed on the cylinder head is less than the number of alternator mounting bosses formed on the cylinder block, the cylinder head side has lower support rigidity than the cylinder block side. Therefore, it is desired to improve the support rigidity on the cylinder head side.
[0018]
According to the first configuration of the present invention, the number of alternator mounting boss portions formed on the cylinder head is less than the number of alternator mounting boss portions formed on the cylinder block. since the alternator mounting boss portion formed on the cylinder head side is reinforced by being formed continuously with the plug member mounting boss portion, the alternator also in support number of small cylinder head side of the alternator mounting boss It is possible to ensure the supporting rigidity.
[0019]
According to the first configuration of the present invention, the alternator mounting boss and the plug member mounting boss are arranged side by side in the piston axial direction, so that the alternator mounting is limited within a limited space of the cylinder head . A boss part and a plug member mounting boss part can be arranged.
[0020]
According to a first aspect of the present invention, since the alternator mounting boss portion is arranged on the lower side can be placed away alternator from the exhaust manifold, it is possible to suppress the thermal effect on the alternator it can.
[0021]
In the second configuration of the present invention, the oil passage is composed of an oil passage for a hydraulic variable valve mechanism that variably controls the opening / closing timing or lift amount of the intake valve or exhaust valve.
[0022]
According to the second configuration of the present invention, the mounting support rigidity of the alternator can be improved using the plug member mounting boss portion of the oil passage for the hydraulic variable valve mechanism.
[0023]
【The invention's effect】
According to the present invention, by using the plug member mounting boss portion of the oil passage, the rigidity of the alternator mounting boss portion can be improved without providing a dedicated reinforcing rib, and the mounting rigidity of the alternator can be improved.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
1 is a side view of the longitudinal direction of the exhaust side of the cylinder head and cylinder block as viewed from the side, FIG. 2 is a front view of the cylinder head and cylinder block as viewed from the front, and FIG. 3 is a cross-sectional view taken along the line AA in FIG. part section), FIG. 4 is a boss portion enlarged view according to the embodiment of the present invention (a view showing a state where the O alternator is not installed).
[0026]
In addition, in this embodiment, the example applied to the 4-cylinder inline type gasoline engine is shown.
[0027]
In FIG. 1, 1 is a cylinder head, and 2 is a cylinder block disposed below the cylinder head 1.
[0028]
On the exhaust side longitudinal side surface 1a of the cylinder head 1, exhaust ports 1b, 1c, 1d, and 1e of the respective cylinders are sequentially formed in the longitudinal direction.
[0029]
Further, on the exhaust side longitudinal side surface 1a of the cylinder head 1, there is formed an exhaust manifold mounting flange 1f that is connected to the exhaust ports 1b, 1c, 1d, and 1e and to which an exhaust manifold M indicated by a virtual line is mounted. .
[0030]
Further, the alternator 3 is attached to the exhaust side longitudinal side surface of the cylinder head 1 and the cylinder block 2 and closer to the front surface 1g (a side surface on which a timing belt (not shown) for driving the alternator is disposed).
[0031]
The alternator 3 is composed of an alternator mounting boss 1h formed on the front surface 1g rather than the exhaust manifold mounting flange 1f, and two alternator mounting bosses 2a and 2a formed on the cylinder block 2. Fastening bolts are attached via 4, 4, and 4 at a total of three locations.
[0032]
Here, the alternator mounting boss 1g on the cylinder head 1 side is formed less than the alternator mounting boss 2a, 2a on the cylinder block 2 side because of the space between the cylinder head 1 and the cylinder block 2. It is due to the difference. That is, because the exhaust manifold mounting flange 1f is formed on the cylinder head 1 side over the entire length in the substantially longitudinal direction, there is not enough space for forming the alternator mounting boss 1h.
[0033]
In addition, the cylinder head 1 is provided with a hydraulic variable valve mechanism (not shown) that controls at least one of the opening / closing timing of the intake valve and the exhaust valve (both not shown) and the lift amount by hydraulic pressure. 2, an oil passage 1i for supplying oil to the hydraulic variable valve mechanism is formed.
[0034]
As shown in FIGS. 2 and 3, the oil passage 1i is a passage extending from the exhaust side longitudinal side surface 1a of the cylinder head 1 in the vicinity of the alternator mounting boss 1h to approximately the center in the width direction of the front surface 1g of the cylinder head 1. It is.
[0035]
As shown in FIG. 1, the opening 1j on one end side of the oil passage 1i is plugged with a plug member 5 at a plug member mounting boss 1k formed on the exhaust side longitudinal side surface 1a, and is closed. In the middle, as shown in FIGS. 2 and 3, the cylinder head 1 is connected to an oil passage 11 supplied with oil from the cylinder block 2 side, and the other end side is connected to the cylinder head 1 as shown in FIGS. 2 and 3. Is connected to an oil passage 1m extending in the longitudinal direction of the cylinder head 1 in the vicinity of the approximate center thereof.
[0036]
The oil passage 1m is connected to an oil passage 1n extending above the cylinder head 1.
[0037]
The oil passage is configured as described above, and is configured to supply oil to the hydraulic variable valve mechanism disposed above the cylinder head 1 via the oil passages 1l, 1i, 1m, and 1n. .
[0038]
In FIG. 3, L1 indicates a piston axis.
[0039]
Further, as shown in FIG. 4, the alternator mounting boss 1h and the plug member mounting boss 1k are arranged side by side in the same direction as the axis L1 direction of the piston (not shown). The plug member mounting boss 1k is formed continuously so that the alternator mounting boss 1h is disposed on the lower side, and the alternator mounting boss 1h partially overlaps the plug member mounting boss 1k. .
[0040]
In FIG. 4, an imaginary line O, which is concentric with the outer diameter of the alternator mounting boss 1h and overlaps the opening 1j of the plug member mounting boss 1k, is connected to the plug member mounting boss 1k. The external shape when it is set as the single alternator mounting boss | hub part 1h which does not overlap (conventional example) is shown.
[0041]
As described above, according to the present embodiment, the opening 1j of the oil passage 1i for the hydraulic variable valve mechanism is disposed close to the alternator mounting boss 1h, and the plug member mounting boss 1k and the alternator are arranged. Since the mounting boss 1h is formed continuously, the rigidity of the alternator mounting boss 1h can be improved by using the plug member mounting boss 1k, and a dedicated reinforcing rib is formed. Thus, the support rigidity of the alternator 3 can be improved.
[0042]
Further, since the alternator mounting boss 1h is formed so as to overlap the plug member mounting boss 1k, the alternator mounting boss 1h and the plug member mounting boss 1k are continuously provided without providing any burrs. It can be formed, and the support rigidity of the alternator mounting boss 1h can be improved.
[0043]
Even if the number of alternator mounting bosses 1h formed on the cylinder head 1 is smaller than the number of alternator mounting bosses 2a, 2a formed on the cylinder block 2, the cylinder head Since the alternator mounting boss portion 1h formed on the one side is reinforced by being formed continuously with the plug member mounting boss portion 1k, the number of alternator mounting boss portions is small. Also, the support rigidity of the alternator 3 can be ensured.
[0044]
Further, since the alternator mounting boss 1h and the plug member mounting boss 1k are arranged side by side in the direction of the piston axis L1 (the vertical direction of the engine), the alternator mounting boss is limited within the limited space of the cylinder head 1. The boss portion 1h and the plug member mounting boss portion 1k can be arranged.
[0045]
Further, since the alternator mounting boss 1h is disposed on the lower side, the alternator 3 can be disposed away from the exhaust manifold M, and the thermal influence on the alternator 3 can be suppressed.
[0046]
In the present embodiment, an example of application to a four-cylinder in-line engine has been shown, but the present invention can also be applied to an engine having a number of cylinders other than four or a diesel engine.
[Brief description of the drawings]
FIG. 1 is a side view of an exhaust-side longitudinal direction of a cylinder head and a cylinder block according to an embodiment of the present invention as viewed from the side.
FIG. 2 is a front view of the cylinder head and the cylinder block according to the embodiment of the present invention as viewed from the front.
FIG. 3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is an enlarged view of a boss portion according to an embodiment of the present invention.
[Explanation of symbols]
1: cylinder head 1a: cylinder head exhaust side longitudinal side 1f: exhaust manifold mounting flange 1 g: Front 1h: alternator mounting boss portion 1j: opening 1i, 1l, 1m, 1n: oil passage 1k: plug member mounting Boss part 2: Cylinder block 2a: Alternator mounting boss part 3: Alternator 4: Fastening bolt 5: Plug member M: Exhaust manifold

Claims (2)

An exhaust manifold mounting flange to which an exhaust manifold is attached is formed on the exhaust side longitudinal side surface of the cylinder head extending in the same direction as the cylinder arrangement direction. From the exhaust side longitudinal side surface of the cylinder head and from the exhaust manifold mounting flange Also, one place on the front side of the engine and two places on the exhaust side longitudinal side of the cylinder block arranged below the cylinder head, an alternator mounting boss is formed, and a fastening bolt is fastened to the alternator mounting boss. An engine auxiliary machine mounting structure for mounting the alternator across the exhaust side longitudinal side surface of the cylinder head and the exhaust side longitudinal side surface of the cylinder block ,
An opening on one end side of an oil passage extending in the same direction as the engine front side is formed at a position on the exhaust side longitudinal side surface of the cylinder head and in the vicinity of the alternator mounting boss portion on the cylinder head side. ,
A plug member mounting boss portion to which a plug member for closing the opening portion is mounted is formed on the periphery of the opening portion on one end side of the oil passage.
The cylinder head side alternator mounting boss portion is continuously formed so as to partially overlap the plug member mounting boss portion, and is aligned with the plug member mounting boss portion in the piston axial direction, and An auxiliary engine mounting structure for an engine, which is disposed on the lower side in the piston axial direction than the plug member mounting boss . 2. The engine accessory mounting structure according to claim 1 , wherein the oil passage is an oil passage for a hydraulic variable valve mechanism that variably controls the opening / closing timing or lift amount of an intake valve or an exhaust valve.

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