Chain cover

Abstract

To provide a chain cover which can fasten an engine hanging tool with improved rigidity.SOLUTION: A chain cover 8 has: three or more first fastening parts 20 including a plurality of first fastening parts 20 which are fastened to a cylinder head 2 and a cylinder block 3, serving as constructional members, and provided along an outer peripheral seal line 24, and at least one first fastening part 20 which is fastened to the constructional members and provided at a center part of the chain cover 8; and a plurality of second fastening parts 21 which are fastened to an engine hanging tool 9. At least one of the second fastening parts 21 is disposed in a range 25 enclosed by the first fastening parts 20 provided along the outer peripheral seal line 24 and the at least one first fastening part 20 provided at the center part of the chain cover 8.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an engine chain cover. [Background technology]

[0002] Conventional engines may use a bracket for fastening an engine hoisting device, which is not fastened to the chain cover but is fastened to structural members such as the cylinder head and cylinder block through a through hole in the chain cover. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-113411 A Summary of the Invention [Problem to be solved by the invention]

[0004] The fastening bolts of the bracket that is fastened to the structural member also serve as the seal line fastening. Because the bracket is not removed and refastened due to concerns about deterioration of the sealing performance, the bracket remains attached to the engine, increasing the number of parts.

[0005] The reason this problem occurs is that the chain cover does not have enough rigidity, which raises concerns about reduced strength and poor sealing performance, making it impossible to fasten the engine hoist only to the chain cover.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a chain cover that has increased rigidity and to which an engine hoisting tool can be fastened. [Means for solving the problem]

[0007] The chain cover of the present invention has three or more first fastening portions including a plurality of first fastening portions that fasten to a structural member and are arranged along an outer peripheral seal line, and at least one first fastening portion that fastens to the structural member and is arranged in a central portion of the chain cover, and a plurality of second fastening portions that fasten to an engine lifting device, and is characterized in that at least one of the plurality of second fastening portions is arranged within an area surrounded by the plurality of first fastening portions and the at least one first fastening portion. Effect of the Invention

[0008] According to the present invention, the engine lifting tool can be fastened with increased rigidity. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of the engine. [Diagram 2] Fig. 2(A) is a front view of the chain cover, and Fig. 2(B) is a rear view of the chain cover. [Diagram 3] 3(A) to 3(C) are diagrams showing examples of connections of walls or ribs. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a schematic diagram showing the configuration of an engine. The engine 1 in FIG. 1 includes a cylinder head 2 and a cylinder block 3. The cylinder head 2 and the cylinder block 3 are examples of structural members. The cylinder head 2 and the cylinder block 3 are fastened together by a plurality of bolts via a gasket (not shown). The cylinder head 2 includes an intake camshaft 4 for operating the intake valve and an exhaust camshaft 5 for operating the exhaust valve.

[0012] The cylinder block 3 is provided with an engine crankshaft 6. An intake camshaft 4 and an exhaust camshaft 5 are connected to the crankshaft 6 by a timing chain 7. The timing chain 7 transmits the driving force of the engine, causing the intake camshaft 4 and the exhaust camshaft 5 to rotate.

[0013] A chain cover 8, which is formed to have a space that contains the chain (which also serves as a chain oil chamber), is fastened with multiple bolts to the sides of the cylinder head 2 and cylinder block 3. Since the intake camshaft 4 and exhaust camshaft 5 driven by the timing chain 7 are on the cylinder head 2 side, and the crankshaft 6 that is the drive source is on the cylinder block 3 side, the timing chain 7 is wound around the sprockets of each shaft, straddling the cylinder head 2 and cylinder block 3. For this reason, the chain cover 8 is provided to cover the cylinder head 2 and cylinder block 3.

[0014] Furthermore, (engine) oil for lubricating the timing chain 7 is circulated in the space formed by the chain cover 8. For this reason, a liquid gasket is provided as a sealing member on the end face of the chain cover 8, which is the joint surface with the cylinder head 2 and the cylinder block 3. This liquid gasket prevents oil leakage from the chain cover 8.

[0015] Furthermore, when the engine 1 is manufactured, an engine suspending tool 9, which is a hook for suspending the engine, is fastened with a plurality of bolts to the chain cover 8. After the engine 1 is mounted on the vehicle body, the engine suspending tool 9 is removed from the chain cover 8.

[0016] Fig. 2(A) is a front view of the chain cover 8. Fig. 2(B) is a rear view of the chain cover 8.

[0017] The chain cover 8 has a plurality of first fastening portions 20 for fastening to the cylinder head 2 and the cylinder block 3 with bolts not shown, and a plurality of second fastening portions 21 for fastening to the engine hoist 9 of Figure 1 with bolts not shown.

[0018] As shown in Fig. 2(B), on the back surface of the chain cover 8, an outer periphery seal line 24 is provided on the outer periphery of the chain cover 8 as a sealing member. A plurality of first fastening portions 20 are provided along this outer periphery seal line 24. A plurality of first fastening portions 20 are also provided in the central portion of the chain cover 8, that is, in a portion other than the outer periphery of the chain cover 8. The first fastening portions 20 are bosses having a through hole at their center that penetrates the chain cover 8 to fasten them to the cylinder head 2 and cylinder block 3 with bolts (not shown).

[0019] The second fastening portion 21 is a boss having a non-through hole at its center that does not penetrate the chain cover 8. The second fastening portion 21 is provided within an area 25 surrounded by three or more first fastening portions 20. At least one of the three or more first fastening portions 20 is a first fastening portion 20 other than the first fastening portion 20 provided along the outer circumferential seal line 24, i.e., a first fastening portion 20 provided in the center of the chain cover 8. This creates an area 25 surrounded by the first fastening portions 20 that fasten to the cylinder head 2 and the cylinder block 3, thereby increasing the rigidity of the area and enabling it to withstand the load when suspending the engine 1.

[0020] If at least one second fastening portion 21 is not positioned within the area 25 surrounded by three or more first fastening portions 20, the second fastening portion 21 will not be able to withstand the load when hanging the engine 1, which may lead to poor sealing properties and problems such as oil leaks.

[0021] For this reason, in this embodiment, at least one second fastening portion 21 is disposed within an area 25 surrounded by three or more first fastening portions 20. This is because, if at least one second fastening portion 21 is disposed within an area 25 surrounded by three or more first fastening portions 20, the load when suspending the engine 1 can be withstood. In Figs. 2(A) and 2(B), three second fastening portions 21 are disposed within an area 25 surrounded by three or more first fastening portions 20, but it is preferable that a plurality of second fastening portions 21 are disposed within an area 25 surrounded by three or more first fastening portions 20. This is because, by increasing the number of second fastening portions 21 disposed within an area 25, the load applied to one second fastening portion 21 can be dispersed.

[0022] 2(A) and 2(B), at least one of the three or more first fastening portions 20 is connected by a wall surface 22 or a rib 23 for increasing rigidity. At least one of the multiple second fastening portions 21 is connected by a wall surface 22 or a rib 23 for increasing rigidity. The difference between the wall surface 22 and the rib 23 is whether the rib 23 is set on purpose or whether the wall surface 22 is used as the rib 23 without setting the rib 23 on purpose.

[0023] In the examples of Figures 2(A) and 2(B), the spaces between the multiple second fastening portions 21 are each connected by three ribs 23, but they may be connected by wall surfaces 22 instead of the ribs 23, and it is not necessary for all of the spaces between the multiple second fastening portions 21 to be connected by ribs 23 or wall surfaces 22.

[0024] The rigidity of the chain cover 8 can be further increased by connecting at least one between three or more first fastening portions 20 and / or at least one between multiple second fastening portions 21 with a wall surface 22 or a rib 23. The wall surface 22 or the rib 23 may be provided on both the front and back surfaces of the chain cover 8, or may be provided on only one of the front and back surfaces of the chain cover 8.

[0025] 3(A) to 3(C) are diagrams showing examples of connections of the wall surfaces 22 or the ribs 23. FIG.

[0026] 3(A) shows an example in which all of the first fastening portions 20 or the second fastening portions 21 are connected by ribs 23. Note that, instead of the ribs 23, all of the first fastening portions 20 or the second fastening portions 21 may be connected by wall surfaces 22.

[0027] 3(B) shows an example in which parts of the first fastening portion 20 or the second fastening portion 21 are connected by a rib 23. Note that instead of the rib 23, parts of the first fastening portion 20 or the second fastening portion 21 may be connected by a wall surface 22.

[0028] Figure 3 (C) shows an example in which parts of the first fastening portion 20 or the second fastening portion 21 are connected by a rib 23, and other parts of the first fastening portion 20 or the second fastening portion 21 are connected by a wall surface 22.

[0029] As described above, according to this embodiment, the chain cover 8 has three or more first fastening parts 20 that are fastened to the structural members, the cylinder head 2 and the cylinder block 3, and are provided along the outer circumferential seal line 24, and at least one first fastening part 20 that is fastened to the structural members and is provided in the center of the chain cover 8, and a plurality of second fastening parts 21 that are fastened to the engine hoist 9. At least one of the plurality of second fastening parts 21 is disposed within a range 25 surrounded by the plurality of first fastening parts 20 provided along the outer circumferential seal line 24 and the at least one first fastening part 20 provided in the center of the chain cover 8. Since the range 25 surrounded by the three or more first fastening parts 20 that are fastened to the cylinder head 2 and the cylinder block 3 is created, the rigidity of the range can be increased and the range can withstand the load when suspending the engine 1. Therefore, the rigidity of the chain cover 8 can be increased to fasten the engine hoist 9.

[0030] Furthermore, at least one between the three or more first fastening portions and / or at least one between the plurality of second fastening portions 21 may be connected by a wall surface 22 or a rib 23. This can further increase the rigidity of the chain cover 8.

[0031] Although a preferred embodiment of the present invention has been described in detail above, the present invention is not limited to such a specific embodiment, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0032] 1 engine, 2 cylinder head, 3 cylinder block, 4 intake camshaft, 5 exhaust camshaft, 6 crankshaft, 7 timing chain, 8 chain cover, 9 engine hoist, 20 first fastening portion, 21 second fastening portion, 22 wall surface, 23 rib

Claims

[Claim 1] three or more first fastening portions, the first fastening portions being fastened to the structural member and provided along an outer circumferential seal line, and at least one first fastening portion being fastened to the structural member and provided in a central portion of the chain cover; a plurality of second fastening portions for fastening to the engine hoist; having A chain cover, characterized in that at least one of the plurality of second fastening portions is disposed within an area surrounded by the plurality of first fastening portions and the at least one first fastening portion.

Images