JP2011127580A - Timing train cover for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase fastening strength to an engine body by load applied by an engine mount part in a timing train cover covering the timing transmission mechanism of an internal combustion engine, fixed on one side of the engine body, and provided with an engine mount part on an outer surface. <P>SOLUTION: This timing train cover includes a cover main body part 20, and the engine mount part 30 bulging out of and formed integrally on the outer surface of the cover main body part 20. A plurality of fastening boss parts 26, 27, 28 for fastening the cover main body part 20 on the engine body 1 are integrally provided on the cover main body part 20, and the fastening boss parts 26, 27, 28 are connected to the base end lower edge of the engine mount part 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a timing train cover that is provided on one side of an engine body of an internal combustion engine and covers a timing transmission mechanism of the internal combustion engine.

  Conventionally, in a four-cycle internal combustion engine, a crankshaft and a valve camshaft for operating a valve gear are linked and connected via a timing transmission mechanism, and the rotation of the crankshaft is operated with a reduction ratio of 1/2. The camshaft is transmitted, and the timing transmission mechanism is covered with a timing train cover provided on one side of the engine body of the internal combustion engine.

  Conventionally, as a timing train cover, what is disclosed in Patent Document 1 is known. In this structure, a chain cover 8 (timing train cover) is fixed to one side of the cylinder block 4 and the cylinder head 6 constituting the engine body, and a cylinder cover 8 is fixed to the outer surface of the chain cover 8. A slope 12 is formed across the mating surface of the block 4 and the cylinder head 6, and the slope 12 improves the sealing performance of the mating surface and improves the rigidity of the chain cover 8. Has been.

Japanese Patent No. 3635793

  However, in the one disclosed in Patent Document 1, although the slope portion contributes to the improvement of the rigidity of the chain cover itself, it does not lead to the improvement of the strength of the fastening portion between the engine main body and the chain cover. In the chain cover provided integrally, a high fastening strength to the engine body is required, but there is a problem that this cannot satisfy the requirement.

  The present invention has been made in view of such circumstances, and provides a novel timing train cover that greatly increases the fastening strength of the timing train cover integrally provided with the engine mount portion to the engine body. With the goal.

To achieve the above object, the invention of claim 1 is a timing train cover fixed to one side of an engine body of an internal combustion engine and covering a timing transmission mechanism of the internal combustion engine,
A cover main body, and an engine mount that integrally bulges on the outer surface of the cover main body. The cover main body includes a plurality of fastening bosses for fastening the cover main body to the engine main body. Are integrally provided, and these fastening boss portions are connected to the lower edge of the base end of the engine mount portion.

  In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the present invention, the cover main body portion has both side edges joined to the engine body and a covering portion connecting between the both side edges. And the base end lower edge of the engine mount portion is characterized in that it is connected between side edge fastening boss portions formed on both side edges.

  In order to achieve the above object, according to a third aspect of the present invention, in the first or second aspect of the present invention, the cover main body portion includes both side edges joined to the engine body, and a covering portion connecting between the both side edges. The cover portion is provided with a central fastening boss portion to be joined to the engine body, and the central fastening boss portion is connected to the lower edge of the base end of the engine mount portion.

  In order to achieve the above object, according to a fourth aspect of the present invention, in the third aspect of the present invention, a fastener for fastening the cover main body portion to the engine body is inserted around the central fastening boss portion. The cylindrical fastener insertion wall is formed, and this fastener insertion wall is provided along the lower edge of the base end of the engine mount portion.

  In order to achieve the above object, the invention according to claim 5 is the bottom surface of the engine mount portion according to claim 1, 2, 3 or 4, which is formed to bulge outward from the outer surface of the cover main body portion. Is formed on an inclined surface that extends downward toward the outer surface of the cover main body, and the lower edge of the base end of the inclined surface is connected to the plurality of fastening boss portions.

  According to the invention of each claim, the load applied from the engine mount portion acts as a fastening force of the plurality of fastening boss portions to the engine body, and the fastening force is increased so that the timing train cover is firmly attached to the engine body. Can be linked to.

  According to the invention of claim 2, the load applied from the engine mount portion increases the fastening force of the side edge fastening boss portions on both side edges of the timing train cover, and firmly connects both side edges of the timing train cover to the engine body. In addition, since the side edge fastening boss part has high rigidity, the rigidity of the engine mount part is improved by connecting the rigid side edge fastening boss parts with the base end lower edge of the engine mount part. Deformation can be suppressed.

  According to the invention of claim 3, the load applied from the engine mount portion increases the fastening force of the central fastening boss portion of the timing train cover, and the central portion of the timing train cover can be firmly connected to the engine body.

  According to the invention of claim 4, even if the central fastening boss portion is joined to the lower edge of the base end of the engine mount portion, the fastener can be inserted into the central fastening boss portion without hindrance, and it is cylindrical. A beam is formed on the lower edge of the base end of the engine mount portion by the fastener insertion wall, and deformation of the engine mount portion is suppressed.

  According to the invention of claim 5, since the lower surface of the engine mount portion is formed as an inclined surface extending downward toward the outer surface of the cover main body portion, the strength of the engine mount portion can be increased. Thus, the deformation is suppressed, and the load acting on the deformation is efficiently transmitted to the timing train cover, so that the fastening force to the engine body can be increased.

The internal combustion engine provided with the timing train cover of the present invention as viewed from the crankshaft direction Sectional view along line 2-2 in FIG. Enlarged view of the phantom line encircled portion in FIG. Sectional view along line 4-4 in FIG. Sectional drawing which follows the 5-5 line of FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention shown in the accompanying drawings.

  In this embodiment, the timing train cover C of the present invention is applied to an OHV type four-cycle multi-cylinder internal combustion engine E for automobiles. As shown in FIGS. The engine body 1 constituting the cylinder block 2 is provided with a cylinder block 2 in which a plurality of cylinders 12 each having a piston 13 slidably fitted thereto are arranged in series, and a valve operating device V fixed on the deck surface of the cylinder block 2. The head cover 4 is fixed to the upper surface of the cylinder head 3, and the oil pan 5 is connected to the lower surface of the crankcase portion 2 c below the cylinder block 2. The crankshaft 6 is rotatably supported by the crankcase portion 2c and a bearing cap 16 fixed to the lower surface of the crankcase portion 2c. One end of the crankshaft 6 is outside the mating surface of the timing train cover C and the oil pan 5. Protruding. The cylinder head 3 is rotatably supported by a pair of valve cam shafts 7 and 7 for driving the valve operating device V. The valve operating device V is covered by the head cover 4.

  The outer end of the crankshaft 6 and the valve camshafts 7 and 7 protruding from one side 1A of the engine body 1 is linked and connected by a timing transmission mechanism T. The timing transmission mechanism T includes a drive sprocket 8 fixed to the outer end of the crankshaft 6, driven sprockets 9 and 9 fixed to the outer ends of the valve camshafts 7 and 7, both sprockets 8, 9 is composed of an endless timing transmission chain 10 suspended between 9 and 9, and the rotation of the crankshaft 6 is controlled by a valve gear camshaft with a reduction ratio of 1/2 via the timing transmission mechanism T. 7 and 7.

  The timing transmission mechanism T is provided outside the one side surface 1A (the surface orthogonal to the crankshaft 6) of the engine body 1, and is fixed to the one side surface 1A with a plurality of connecting bolts 15 in the present invention. The timing train cover C is covered.

  As shown in FIGS. 1 and 2, the timing train cover C is fixed to one side 1 </ b> A of the engine body 1, i.e., one side of the cylinder block 2 and the cylinder head 3 across the mating surfaces.

  The timing train cover C includes a cover main body portion 20 that covers the timing transmission mechanism T, and an engine mount portion 30 that is integrally bulged outwardly on the upper outer surface of the cover main body portion 20. The cover main body portion 20 has a shape that follows the contour shape of the upper edge 21 along the upper surface of the cylinder head 3, the lower edge 22 along the lower surface of the crankcase portion 2c of the cylinder block 2, and the side edges of one side surface 1A of the engine body 1. The rib-shaped side edges 23 and 24 and the upper edge 21, the lower edge 22, and the side edges 23 and 24 that are formed are formed.

  The engine mount portion 30 is used to suspend and support the internal combustion engine E on an engine support portion, in this embodiment, a vehicle body frame F of an automobile via a timing train cover C. It has a vertical width and extends across the entire width of the cover main body 20, and both side edges of the cover main body 20 are connected to both side edges 23 and 24.

  The engine mount portion 30 includes a bulging portion 34 that bulges outward from the cover main body portion 20, and a mounting flange portion 31 that bulges further outward from an intermediate portion of the bulging portion 34 and extends laterally. A pair of bolt holes 32 are formed in the mounting flange portion 31, and support bolts 36 inserted through these bolt holes 32 are fastened to the vehicle body frame F via rubber mounts 37. As a result, the internal combustion engine E is suspended and supported by the vehicle body frame F via the timing train cover C.

  As shown in FIGS. 2 and 3, the lower surface of the engine mount portion 30 is formed on a linear inclined surface 33 that extends downward from the outer end toward the base end, that is, the outer surface of the cover main body portion 20. A plurality of side edge fastening boss portions 26 and 27 and a central fastening boss portion 28 described later are integrally joined to the lower edge of the base end of the inclined surface 33. The inclined surface 33 is formed in a straight line, so that the force is efficiently transmitted from the engine mount 30 to the engine body 1.

  A plurality of left and right side edge fastening boss portions 26 and 27 each having a boss hole are integrally formed on the left and right side edges 22 and 23 of the cover main body 20 with a space in the vertical direction. Among the plurality of left and right side edge fastening boss portions 26 and 27, the interval between the adjacent ones straddling the lower surface of the engine mount portion 30 is narrower than the interval between the other ones. A central fastening boss portion 28 having a boss hole is formed integrally with an intermediate portion of the covering portion 25 of the cover main body portion 20 in the vicinity of the center portion of the lower surface of the engine mount portion 30. Around the fastening boss portion 28, a cylindrical fastener insertion wall 29 is recessed in the inclined surface 33 along the inclined surface 33 of the engine mount portion 30, and through the fastener insertion wall 29. The connecting bolt 15 can be inserted into the central fastening boss portion 28.

  Thus, the covering portion 25 of the cover main body portion 20 is separated from the one side surface 1A of the engine body 1 to cover the timing transmission mechanism T and easily vibrates, but is centrally fastened at an intermediate portion of the covering portion 25. By fastening to the engine body 1 with the boss portion 28, the vibration can be effectively reduced.

  Further, assuming that the cylindrical fastener insertion wall 29 is not provided, the inclined surface 33 is a mere flat surface and is easily deformed by the force from the engine mount portion 30. By forming the concave fastener insertion wall 29 in a concave shape, a beam is formed in the middle of the inclined surface 33, and deformation of the engine mount portion 30 is suppressed.

  Further, as shown in FIG. 1, the central fastening boss portion 28 is on the axis of one support bolt 36 of the engine mount portion 30. For this reason, the force applied to the engine mount portion 30 is efficiently transmitted to the support bolt 36 in a short distance.

  Further, another central fastening boss portion 28 ′ is integrally formed in the upper middle of the covering portion 25 of the cover main body portion 20.

  The inner surface of the timing train cover C configured as described above is abutted against one side surface of the engine body 1 including the cylinder block 2 and the cylinder head 3, and the left and right side edge fastening boss portions 26 and 27 and the center fastening boss are arranged. The timing train cover C is integrally attached to one side surface 1A of the engine body 1 by inserting the connecting bolts 15 into the boss holes of the portions 28 and 28 'and fastening them to the engine body 1. In this attached state, the inclined surface 33 of the engine mount portion 30 is positioned so as to straddle the mating surface of the cylinder block 2 and the cylinder head 3.

  The engine mount portion 30 of the timing train cover C is suspended and supported on the vehicle body frame F by a support bolt 36 via a rubber mount 37. Then, the load applied from the engine mount portion 30 acts as a fastening force to the engine body 1 via the side edge fastening boss portions 26 and 27 and the central fastening boss portion 28, and the fastening force increases and the timing train cover C is increased. Can be firmly connected to the engine body 1.

  As shown in FIG. 3, if the lower surface of the engine mount portion 30 is formed on the inclined surface 33, the downward load (arrow (A)) applied to the engine mount portion 30 is a component force in the direction of the inclined surface of the engine mount portion 30 ( Further, the component force in the axial direction of the connecting bolt 15 of the right and left side edge fastening boss portions 26 and 27 and the central fastening boss portion 28 (arrow (C)) acting as an arrow (B)). These component forces can increase the fastening force of the timing train cover C to the engine body 1 and increase the fastening strength of the timing train cover C to the engine body 1.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention.

  For example, in the above embodiment, the timing transmission mechanism is composed of a driving and driven sprocket and an endless transmission chain, but instead of this, it is composed of a driving and driven cog wheel and an endless transmission cog belt. In the above-described embodiment, a valve operating device using a pair of valve operating camshafts is used, but a single valve operating camshaft is used instead. A valve operating device may be used.

1 .... Engine body 20 ... Cover main part 23 ... Side edge 24 ... Side edge 25 ... Coating 26 ······· Fastening boss (side edge fastening boss)
27 .... Fastening boss (side edge fastening boss)
28 ..... Fastening boss (center fastening boss)
29 .... Fastener insertion wall 30 ... Engine mount 33 ... Inclined surface 36 ... Fastener (support bolt)
E ... Internal combustion engine T ... Timing transmission mechanism

Claims (5)

A timing train cover fixed to one side of the engine body (1) of the internal combustion engine (E) and covering the timing transmission mechanism T (T) of the internal combustion engine (E),
A cover main body portion (20) and an engine mount portion (30) integrally bulging and formed on the outer surface of the cover main body portion (20). The cover main body portion (20) includes the cover main body portion ( 20) a plurality of fastening boss portions (26, 27, 28) for fastening the engine body (1) to the engine body (1) are integrally provided, and these fastening boss portions (26, 27, 28) are provided on the engine mount portion ( 30) A timing train cover for an internal combustion engine, characterized in that the timing train cover is connected to the lower edge of the base end. The cover main body (20) has both side edges (23, 24) joined to the engine body (1) and a covering part (25) connecting between the both side edges (23, 24). The base end lower edge of the mount part (30) is connected between the side edge fastening boss parts (26, 27) formed on the both side edges (23, 24). The internal combustion engine timing train cover as described. The cover main body (20) has both side edges (23, 24) joined to the engine body (1) and a covering part (25) connecting the both side edges (23, 24). The part (25) is provided with a central fastening boss part (28) joined to the engine body (1), and the central fastening boss part (28) is connected to the lower edge of the base end of the engine mount part (30). The timing train cover for an internal combustion engine according to claim 1, wherein the timing train cover is provided. A cylindrical fastener insertion wall (29) for inserting a fastener (15) for fastening the cover main body portion (20) to the engine body (1) around the central fastening boss portion (28). The timing train cover for an internal combustion engine according to claim 3, wherein the fastener insertion wall (29) is provided along the lower edge of the base end of the engine mount portion (30). . The lower surface of the engine mount portion (30) formed to bulge outward from the outer surface of the cover main body portion (20) has an inclined surface (33) that extends downward toward the outer surface of the cover main body (20). The base end lower edge of the inclined surface (33) is joined to the plurality of fastening boss portions (26, 27, 28). Or a timing train cover of the internal combustion engine according to 4;

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