WO2021070297A1

WO2021070297A1 - Cylinder head cover structure, engine, and work machine

Info

Publication number: WO2021070297A1
Application number: PCT/JP2019/039881
Authority: WO
Inventors: 卓鈴木; 照幸齊藤
Original assignee: 本田技研工業株式会社
Priority date: 2019-10-09
Filing date: 2019-10-09
Publication date: 2021-04-15
Also published as: CN114450475B; CN114450475A

Abstract

One aspect of the present invention relates to a cylinder head cover structure, said cylinder head cover structure comprising a cylinder head cover assembled on a cylinder head of an engine, and a cylinder head cover packing placed between the cylinder head and the cylinder head cover, wherein the cylinder head cover includes an exposure part through which the cylinder head cover packing is partially exposed.

Description

Cylinder head cover structure, engine and work equipment

The present invention mainly relates to an engine cylinder head cover structure.

The cylinder head of the engine is covered with a cylinder head cover via a predetermined packing (see Patent Document 1).

Generally, in order to improve the manufacturing aspect, it is required to improve the assembling property of the component parts and the reliability of the product, and this is the same in the manufacturing of the above engine.

Jikkai Sho 61-187945

An exemplary object of the present invention is to provide a cylinder head cover structure that is advantageous in improving assemblability and reliability.

The first side surface of the present invention relates to a cylinder head cover structure, and the cylinder head cover structure includes a cylinder head cover assembled to the cylinder head of an engine and a cylinder head cover packing arranged between the cylinder head and the cylinder head cover. , The cylinder head cover is characterized by including an exposed portion that partially exposes the cylinder head cover packing.

According to the present invention, it is possible to improve the assemblability and reliability of the cylinder head cover structure.

Schematic diagram of a cross section for explaining an example of the structure of an engine. The schematic diagram for demonstrating an example of the structure of a cylinder head cover. The schematic diagram for demonstrating an example of the structure of a cylinder head cover packing. The schematic diagram for demonstrating the mode at the time of assembling the cylinder head cover. The schematic diagram for demonstrating another example of the structure of a cylinder head cover.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. The following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the plurality of features described in the embodiments may be arbitrarily combined. Further, the same or similar configuration will be given the same reference number, and duplicate description will be omitted.

FIG. 1 is a schematic diagram showing a configuration example of the engine 1 according to the embodiment. The engine 1 includes a crankcase 11, a cylinder block 12, an oil pan 13, a cylinder head 14, and a cylinder head cover 15.

The crankcase 11 accommodates a crankshaft 111, a crankpin 112, and the like. The cylinder block 12 accommodates a cylinder 121, a piston 122 slidably held by the cylinder 121, a connecting rod 123 that connects the piston 122 and the crank pin 112, and the like. An oil dipper 123a is provided at the end of the connecting rod 123. Further, the oil pan 13 stores the oil 131, and the oil 131 is agitated as lubricating oil by the oil dipper 123a. The crankcase 11, the cylinder block 12, and the oil pan 13 can be provided integrally.

The cylinder head 14 incorporates a valve gear 140, and houses, for example, a spark plug 141, an intake / exhaust valve 142, a rocker arm 143, a push rod 144, and the like. When the engine 1 is in the operating state, the camshaft 91 rotates via a timing gear (not shown) as the crankshaft 111 rotates due to the reciprocating motion of the piston 122. Along with this, the push rod 144 reciprocates, and the reciprocating motion is converted into an opening / closing operation of the intake / exhaust valve 142 by the rocker arm 143 (push rod / rocker arm method).

The cylinder head cover 15 is assembled to the cylinder head 14. Although the details will be described later, the cylinder head cover 15 is assembled to the cylinder head 14 via a predetermined cylinder head cover packing, whereby the sealing and protection of the cylinder head 14 can be appropriately realized. The cylinder head cover packing may be expressed as a gasket, a seal, or the like.

Such an engine 1 can be used as a mobile power source, and can also be applied to various work machines (for example, trowell, sweeper, etc.) that perform predetermined work based on the power. The engine 1 is not limited to the above-described configuration example, and various modifications can be applied without departing from the spirit of the engine 1.

By the way, when manufacturing the engine 1, it is relatively easy for the manufacturer or the operator to confirm whether or not the cylinder head cover 15 has been properly assembled in order to improve the work efficiency. It may be preferable. This will be described later with reference to FIGS. 2 to 5.

FIG. 2 is a schematic diagram for explaining an example of the configuration, mainly the shape, of the cylinder head cover packing (hereinafter, simply “packing”) 16. The packing 16 is formed in an annular shape in a plan view and has a line-symmetrical outer shape in the present embodiment (line L1 indicates a line of symmetry). Although details will be described later, the packing 16 includes extending

portions

161a and 161b extending outward, and they are located on the symmetry line L1 in the present embodiment.

The packing 16 may be formed with a uniform wall thickness, which makes it relatively easy to manufacture the packing 16. For example, the packing 16 can be easily obtained by processing the material constituting the packing into a plate shape (preparing a material having a uniform thickness) and cutting out the packing 16 from the plate-shaped material. As the material of the packing 16, known materials such as a rubber material, a resin material, and wood may be used.

FIG. 3 is a schematic diagram for explaining an example of the configuration, mainly the shape, of the cylinder head cover (hereinafter, simply “head cover”) 15. FIG. 3 shows a state in which the head cover 15 is viewed from the inner wall side (cylinder head 14 side). The head cover 15 includes a flat portion 150, a fixed portion 151, a rib 152, and exposed

portions

153a, 153b, and 153c.

The flat portion 150 is a lid portion main body that forms a flat surface at least partially so as to cover the cylinder head 14. The fixing portion 151 is provided on the peripheral portion of the flat portion 150, each corner portion in the present embodiment, whereby the head cover 15 can be fixed to the cylinder head 14 by, for example, fastening. The rib 152 is provided along the outer circumference of the flat portion 150, and is provided around the rib 152 so as to extend or bend / bend toward the cylinder head 14.

The exposed

portions

153a, 153b and 153c are notches, slits and openings for partially exposing the packing 16, respectively, although details will be described later. In the following description, for ease of understanding, the exposed portion 153a may be referred to as a notch 153a, the exposed portion 153b may be referred to as a slit 153b, and the exposed portion 153c may be referred to as an opening 153c.

The notch 153a and the slit 153b are provided in the rib 152, respectively, and in the present embodiment, they are provided at positions facing each other. The opening 153c is provided from the flat portion 150 to the rib 152.

FIG. 4 is a schematic view for explaining an installation mode of the packing 16 with respect to the head cover 15 when the head cover 15 is assembled to the cylinder head 14. A packing 16 is installed on the head cover 15 (this structure is referred to as “cylinder head cover structure ST1”), and the head cover 15 is assembled to the cylinder head 14 in that state. The packing 16 can be installed on the head cover 15 by engaging the extension portion 161a with the notch 153a and inserting the extension portion 161b into the slit 153b. This also facilitates the alignment of the packing 16 with respect to the head cover 15. Therefore, according to the present embodiment, it can be said that the packing 16 can be installed on the head cover 15 relatively easily.

Further, in the present embodiment, the packing 16 has a line-symmetrical outer shape with the line L1 as a symmetric line (see FIG. 2). Therefore, the packing 16 can be installed so that either the front surface or the back surface thereof faces the head cover 15. Therefore, according to the present embodiment, it can be said that the installation of the packing 16 on the head cover 15 is even simpler.

Further, in the present embodiment, the exposed

portions

153a and 153b are provided so as to face each other at the peripheral edge portion of the head cover 15. In other words, the packings 16 are fixed at two positions facing each other, that is, a pair of fixing points of the packing 16 with respect to the head cover 15 are provided so as to face each other. Therefore, according to the present embodiment, the packing 16 is appropriately held by the head cover 15, and when the head cover 15 is assembled to the cylinder head 14 from above, for example, the packing 16 installed on the head cover 15 is positioned downward. When the head cover 15 is assembled, it is possible to prevent the packing 16 from falling from the head cover 15.

In the present embodiment, the width of the extension portion 161a is larger than the width of the notch 153a. As a result, it is possible to appropriately prevent the packing 16 from falling when the head cover 15 is assembled.

As another embodiment, the width of the extension portion 161b may be larger than the width of the slit 153b, but in the present embodiment, the width of the extension portion 161b is smaller than the width of the slit 153b. In this case, it is possible to prevent the packing 16 from falling while facilitating the installation of the packing 16 on the head cover 15.

That is, since the width of the extension portion 161a is larger than the width of the notch 153a (because the extension portion 161a is wider than the notch 153a), the extension portion 161a is located below (the head cover 15). Even during assembly), the extension portion 161a is held (or pinched) from the side by the notch 153a with its elastic force, and the packing 16 can be appropriately prevented from falling.

Further, since the width of the extending portion 161b is smaller than the width of the slit 153b (because the extending portion 161b is narrower than the slit 153b), it can be smoothly (simplely) inserted into the slit 153b. Even in a state where the extending portion 161b is located downward (when the head cover 15 is assembled), the lower portion is held by the slit 153b, and the packing 16 can be appropriately prevented from falling.

In another embodiment, the

extension portions

161a and 161b may be provided so that the structures for holding them are reversed, in other words, the narrow extension portion 161a is inserted into the slit 153b and is wide. The extension 161b may be modified to be inserted into the notch 153a. That is, of the extending

portions

161a and 161b provided at positions facing each other, one of the narrow ones is inserted into the slit 153b, and the other of the wide ones is held from the side by the notch 153a with its elasticity. Just do it. As a result, a structure capable of appropriately holding the packing 16 can be realized with a relatively small size.

Here, when the extension portion 161a or the like is narrowed and inserted into the slit 153b to be held, the extension portion 161a or the like is lengthened (slit 153b) in order to ensure the holding. Increasing the amount of protrusion from)) may be required. Therefore, while the packing 16 can be easily installed by narrowing the extension portion 161a or the like, the extension portion 161a or the like may interfere with other parts due to the lengthening of the extension portion 161a or the like. There is. Then, in order to prevent this, some restrictions may occur in the layout of the cylinder head 14 and the head cover 15.

In contrast to the above-mentioned case where the extension portion 161a or the like is narrowed, when the extension portion 161a or the like is widened and held from the side by the notch 153a, the extension portion 161a or the like can be shortened. It is possible, so that the amount of protrusion from the notch 153a can be reduced. Therefore, it is possible to prevent interference with the above-mentioned other parts.

In the present embodiment, one of the extending

portions

161a and 161b is narrowed and lengthened and inserted into the slit 153b, and the other is widened and shortened and held by the notch 153a. This makes it easier to visually check the top and bottom of the packing 16 and further improves the assembling property.

Here, with the packing 16 installed on the head cover 15, the packing 16 is partially exposed by the exposed

portions

153a, 153b, and 153c. Therefore, the presence or absence of the packing 16 can be visually recognized from the outer wall side of the head cover 15 (the side opposite to the cylinder head 14 side). As a result, even after the head cover 15 is assembled to the cylinder head 14, the presence of the packing 16 can be confirmed via the exposed

portions

153a, 153b and 153c. Therefore, according to the present embodiment, the production of the engine 1 does not proceed without the packing 16 being installed, which is advantageous for improving the productivity of the engine 1 and further improving the reliability of the engine 1.

In the present embodiment, since the three exposed

portions

153a, 153b and 153c are provided, the presence or absence of the packing 16 can be visually recognized from various angles, but the number of the exposed portions 153a and the like is not limited to this example. Absent. That is, at least one exposed portion 153a or the like may be provided at a position advantageous for visual recognition by the manufacturer or the operator. For example, according to the exposed

portions

153a and 153b, it is possible to prevent the packing 16 from falling when the head cover 15 is assembled, and at the same time, it is possible to make the above-mentioned visual recognition relatively easy. Further, according to the exposed portion 153c, the above-mentioned visual recognition can be further facilitated.

The shape of the exposed portion 153a or the like is not limited to the above-described embodiment, and the exposed portion 153a or the like may be provided so that the packing 16 can be visually recognized by the manufacturer or the operator. Further, the packing 16 is not limited to the above-mentioned outer shape, and may not be line-symmetrical, for example.

FIG. 5 shows another example of the installation mode of the packing 16 (referred to as “packing 16'” for distinction) with respect to the head cover 15 (referred to as “head cover 15'” for distinction) as another embodiment (this). The structure is referred to as “cylinder head cover structure ST2”). In the example of FIG. 5, the head cover 15'includes two notches 153d1 and 153d2, as well as two other notches 153e1 and 153e2.

The notches 153d1 and 153d2 are provided on the rib 152 at a distance from each other by a predetermined distance. In FIG. 5, the portion of the rib 152 between the notches 153d1 and 153d2 is shown as portion 152P1.

Further, the notches 153e1 and 153e2 are provided on the rib 152 at positions facing the notches 153d1 and 153d2, separated from each other by a predetermined distance. In FIG. 5, the portion of the rib 152 between the notches 153e1 and 153e2 is shown as portion 152P2.

In the example of FIG. 5, the packing 16'is not provided with the extension portion 161b. Then, the extending portion 161a is provided with a hole through which the portion 152P1 can be inserted. By inserting the portion 152P1 into this hole, the packing 16'can be appropriately fixed to the head cover 15'. Also in this example, since the packing 16'can be visually recognized from the outer wall side of the head cover 15', it can be said that the same effect as that of the embodiment can be obtained.

Further, in the example of FIG. 5, the outer shape of the packing 16'is non-axisymmetric. In this case, which of the front surface and the back surface of the packing 16'faces the head cover 15 is determined in advance. Along with this, a hole of the extending portion 161a for inserting the portion 152P1 is provided so that the portion 152P1 can be easily inserted into the hole (and / or the portion 152P1 is difficult to be pulled out from the hole). It is also possible.

As another example, the packing 16'may be further provided with an extension portion 161b, and the extension portion 161b may be provided with a hole through which the portion 152P2 can be inserted, similarly to the extension portion 161a. By inserting the portion 152P2 into this hole, the packing 16'can be more appropriately fixed to the head cover 15'.

In the above description, for ease of understanding, each element is shown by a name related to its functional aspect, but each element is not limited to the one having the contents described in the embodiment as the main function. However, it may be provided as an auxiliary.

Each feature of the embodiment is summarized as follows:
The first aspect relates to a cylinder head cover structure (for example, ST1, ST2), wherein the cylinder head cover structure includes a cylinder head cover (for example, 15) assembled to a cylinder head (for example, 14) of an engine (for example, 1) and the cylinder. A cylinder head cover structure including a cylinder head cover packing (for example, 16) arranged between the head and the cylinder head cover, wherein the cylinder head cover is an exposed portion (for example, 153a) that partially exposes the cylinder head cover packing. , 153b, 153c). According to this structure, the cylinder head cover packing can be visually recognized from the cylinder head cover outer wall side. Therefore, it becomes possible to relatively easily confirm whether or not the cylinder head cover packing is properly assembled at the time of manufacturing, and thereby it is possible to improve the assembling property and reliability of the cylinder head cover structure. ..

In the second aspect, the cylinder head cover further includes ribs (for example, 152) provided so as to extend toward the cylinder head side. This makes it possible to appropriately protect the cylinder head.

In a third aspect, the exposed portion includes a notch (eg, 153a) provided in the rib, and the cylinder head cover packing extends to engage with the notch (eg, 161a). ) Is included. As a result, at the time of the above assembly, it is possible to properly align the cylinder head cover packing, whereby the above assembly can be performed relatively easily.

In the fourth aspect, the width of the extension portion is larger than the width of the notch. This makes it possible to prevent the cylinder head cover packing from falling during the above assembly.

In a fifth aspect, the exposed portion includes a slit (eg, 153b) provided in the rib, and the cylinder head cover packing includes an extending portion (for example, 161b) extending so as to insert the slit. It is characterized by that. As a result, at the time of the above assembly, it is possible to properly align the cylinder head cover packing, whereby the above assembly can be performed relatively easily.

A sixth aspect is characterized in that the width of the extending portion is smaller than the width of the slit. This makes it possible to easily install the packing (for example, 16) on the head cover (for example, 15) and prevent the cylinder head cover packing from falling during the above assembly.

In a seventh aspect, the exposed portion comprises a notch (eg, 153a) and a slit (eg, 153b) provided in the rib, and the cylinder head cover packing extends and extends to engage the notch. Includes a first extension (eg, 161a) that is wider than the notch and a second extension (eg, 161b) that extends through the slit and is narrower than the slit. It is characterized by that. As a result, the above assembly can be performed relatively easily, and the cylinder head cover packing can be prevented from falling at that time.

In the eighth aspect, the cylinder head cover packing has a line-symmetrical outer shape, and the extension portion is provided on the line of symmetry (for example, L1). This makes it possible to install the cylinder head cover packing so that either the front surface or the back surface thereof faces the cylinder head cover.

In the ninth aspect, the exposed portions are provided in pairs on the peripheral edge portion of the cylinder head cover so as to face each other. This makes it easier to see the cylinder head cover packing from the outside of the cylinder head cover.

In a tenth aspect, one of the pair of exposed portions includes a notch (eg, 153a) provided in the rib, and the other of the pair of exposed portions includes a slit (eg, 153b) provided in the rib. It is characterized by including. As a result, the packing can be miniaturized, and the degree of freedom in layout of the cylinder head and the cylinder head cover to which the packing is assembled is improved.

In the eleventh aspect, the cylinder head cover further includes a flat portion (for example, 150) that forms a flat surface at least partially inside the rib, and the exposed portion is an opening provided in the flat portion (for example, 150). For example, it is characterized by including 153c). This makes it easier to see the cylinder head cover packing from the outside of the cylinder head cover.

In the twelfth aspect, the cylinder head cover packing is molded with a uniform wall thickness. This makes it possible to manufacture the cylinder head cover packing relatively easily.

A thirteenth aspect relates to an engine (for example, 1), wherein the engine has the cylinder head cover structure (for example, ST1, ST2) described above. That is, the cylinder head cover structure described above can be applied to various engine structures.

A fourteenth aspect relates to a working machine, which is characterized by comprising the engine (eg, 1) described above. That is, the above-mentioned engine can be applied to various working machines that perform predetermined work based on the power of the engine.

The invention is not limited to the above embodiment, and various modifications and changes can be made within the scope of the gist of the invention.

Claims

A cylinder head cover structure including a cylinder head cover assembled to the cylinder head of an engine and a cylinder head cover packing arranged between the cylinder head and the cylinder head cover.
The cylinder head cover structure includes an exposed portion that partially exposes the cylinder head cover packing.
The cylinder head cover structure according to claim 1, wherein the cylinder head cover further includes ribs that are provided so as to extend toward the cylinder head side.
The exposed portion includes a notch provided in the rib.
The cylinder head cover structure according to claim 2, wherein the cylinder head cover packing includes an extension portion that extends so as to engage with the notch.
The cylinder head cover structure according to claim 3, wherein the width of the extending portion is larger than the width of the notch.
The exposed portion includes a slit provided in the rib.
The cylinder head cover structure according to any one of claims 2 to 4, wherein the cylinder head cover packing includes an extending portion extending so as to insert the slit.
The cylinder head cover structure according to claim 5, wherein the width of the extending portion is smaller than the width of the slit.
The exposed portion includes a notch and a slit provided in the rib.
The cylinder head cover packing has a first extending portion that extends so as to engage with the notch and is wider than the notch, and extends so as to insert the slit and is narrower than the slit. The cylinder head cover structure according to any one of claims 2 to 6, further comprising a second extending portion.
The method according to any one of claims 3 to 7, wherein the cylinder head cover packing has a line-symmetrical outer shape, and the extending portion is provided on the line of symmetry. Cylinder head cover structure.
The cylinder head cover structure according to any one of claims 2 to 8, wherein the exposed portions are provided in pairs on the peripheral edge portion of the cylinder head cover so as to face each other.
One of the pair of exposed portions includes a notch provided in the rib.
The cylinder head cover structure according to claim 9, wherein the other of the pair of exposed portions includes a slit provided in the rib.
The cylinder head cover further includes a flat portion that forms a flat surface at least partially inside the rib.
The cylinder head cover structure according to any one of claims 2 to 10, wherein the exposed portion includes an opening provided in the flat portion.
The cylinder head cover structure according to any one of claims 2 to 11, wherein the cylinder head cover packing is molded with a uniform wall thickness.
An engine having the cylinder head cover structure according to any one of claims 1 to 12.
A working machine comprising the engine according to claim 13.