JPH0727394Y2 - Cylinder block structure of engine with automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvement of a cylinder block structure of an engine with an automatic transmission, and more specifically, an oil pan of a cylinder block in which a skirt portion supporting a crankshaft is divided into a lower block and a lower block. Regarding improvement of mounting structure.

(Prior Art) For example, as disclosed in Japanese Utility Model Laid-Open No. 61-105741, a skirt portion of an engine cylinder block is divided into an upper block and a lower block, and a half-split bearing is provided on both blocks. A structure in which a crankshaft is pivotally supported by a part is used. In such a two-part cylinder block structure, the lower block can have a ladder frame structure, so that the rigidity of the entire cylinder block can be increased. Further, since the casing of the transmission can be attached using the upper block and the lower block of the cylinder block, the rigidity of the lower block is increased, so that the connecting strength between the cylinder block and the transmission is increased.

(Problems to be Solved by the Invention) When the conventional two-division type cylinder block structure described above is applied to an engine with an automatic transmission, the rigidity of the cylinder block itself and the connection strength between the cylinder block and the automatic transmission are further enhanced. In order to achieve this, it is desirable to increase the vertical width of the lower block as much as possible, but since the upper edge of the oil pan is attached along the outer peripheral edge of the lower surface of the conventional lower block, the vertical width of the lower block can be increased. If it is increased, another problem will occur.

That is, in the case of an automatic transmission, after the casing of the automatic transmission is attached to the rear end of the cylinder block, the drive plate provided at the rear end of the crankshaft using the opening at the front end of the casing of the automatic transmission. Must be screwed to the torque converter cover of the automatic transmission, but if the vertical width of the lower block is increased, the oil pan attached to the lower surface of the lower block will open the opening at the front end of the casing of the automatic transmission. This results in a problem that it becomes difficult to screw the drive plate with a tool.

Therefore, an object of the present invention is to facilitate the screwing work of the drive plate while increasing the rigidity of the cylinder block itself and the connecting strength between the cylinder block and the automatic transmission by increasing the vertical width of the lower block. (EN) It is possible to provide a cylinder block structure of an engine with an automatic transmission that can be performed.

(Means and Actions for Solving Problems) In order to achieve the above object, in the present invention, a cylinder block is divided into an upper block and a lower block, and a crankshaft is supported between the two blocks. An automatic transmission casing mounting part is formed on the rear ends of the upper block and the lower block, an oil pan mounting part is formed on the lower surface of the lower block, and the inner peripheral part is mounted on the rear end of the crankshaft and the outer peripheral part is automatically formed. A drive plate attached to a torque converter cover of the transmission is provided, and a rear end portion of the oil pan attachment portion is located in front of a rear end portion of the lower block, and a lower surface of the lower block is provided.
A recess is formed between the rear end of the oil pan mounting portion and the rear end of the lower block so as to open outward from the rear end surface of the lower block to the rear end of the lower block. A tool accommodating portion for mounting a drive plate is provided between the portion and a casing of the automatic transmission. The cylinder block structure of the engine with an automatic transmission is characterized in that.

In the cylinder block structure of the engine with the automatic transmission having the above structure, the rigidity of the cylinder block itself can be increased by increasing the vertical width of the lower block, and the connecting point between the upper and lower blocks and the casing of the automatic transmission can be improved. Since it is possible to increase the number, it is possible to increase the connection strength between the cylinder block and the automatic transmission.
Moreover, the rear end of the oil pan mounting portion formed on the lower surface of the lower block is located in front of the rear end of the lower block, and the rear end of the oil pan mounting portion and the rear block of the lower block are located on the lower surface of the lower block. Since the concave portion is formed between the end and the end, it is possible to secure the space in the front-rear direction of the cylinder block and the space in the up-down direction. Even if the vertical width of the lower block is increased, it is attached to the lower block It is possible to secure a tool accommodating portion (tool working space) for screwing the drive plate between the oil pan and the casing of the automatic transmission. Therefore, it is possible to facilitate the screwing work of the drive plate while improving the rigidity of the cylinder block itself by increasing the vertical width of the lower block and increasing the connection strength between the cylinder block and the automatic transmission.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment in which the present invention is applied to a cylinder block for a V-type 6 cylinder engine with an automatic transmission. First, referring to FIGS. 1 and 2, a skirt portion of a cylinder block 10 according to the present invention is divided into an upper block 11 and a lower block 12,
The crankshaft 13 is rotatably supported by half-bearing bearings 14 and 15 provided on the upper block 11 and the lower block 12, respectively. A front end of a casing 17 of the automatic transmission 16 is attached to rear ends of the upper block 11 and the lower block 12.

The drive plate 18 having the inner peripheral portion attached to the rear end of the crankshaft 13 is provided on the torque converter cover 19 in the automatic transmission 16 after the casing 17 of the automatic transmission 16 is attached to both blocks 11 and 12. The outer peripheral part is tightened and fixed by the nut 21 to the screw part 20
A tool 22 is used to tighten 21. An opening 17a at the front end of the casing 17 is provided below the rear end of the lower block 12 in order to perform this tool work. The opening 17a is closed by a cover plate (not shown) after the drive plate 18 is fixed.

As can be seen from FIGS. 3 and 4, the lower block 12 includes left and right side frames 23, 24 and four ladder frames 25 formed in a ladder shape between the side frames 23, 24. Bearing part 15 for supporting the crankshaft 13
Are formed on each ladder frame 25. The balance weight 13a (see FIG. 2) of the crankshaft 13 is arranged between two adjacent ladder frames 25. As shown in FIG. 5, a casing mounting hole 26 for mounting the casing 17 of the automatic transmission 16 is formed in the rear end ladder frame 25 of the lower block 12. Although illustration is omitted, a similar casing mounting hole is also formed at the rear end of the upper block 11.

As can be seen from FIGS. 2 to 4, the lower block 12 has a bottom wall 27 formed integrally with the side frames 23, 24 and the ladder frame 25, and an oil pan 28 is attached to the bottom wall 27. An oil pan mounting portion 29 for forming is formed. As can be seen from FIG. 2, the lower block 12 has such a vertical width that at least the balance weight 13a of the crankshaft 13 does not interfere with the bottom wall 27. Since the vertical width is about 1.5 times that of the conventional lower block, it contributes greatly to the improvement of the rigidity of the cylinder block 10 and the connection strength between the cylinder block 10 and the automatic transmission 16.

The bottom wall 27 of the lower block 12 has two openings 30 for returning the oil circulated in the cylinder block 10 to the oil pan 28.
However, since these openings 30 are not openings for avoiding interference with the balance weight 13a, the openings 3
The position and size of 0 are not limited by the balance weight 13a. Therefore, by forming the opening 30 small, the reinforcing effect of the bottom block 12 by the bottom wall 27 can be enhanced.

As can be seen from FIGS. 2 and 4, the rear end portion of the oil pan mounting portion 29 of the lower block 12 is arranged in front of the rear end portion of the lower block 12. Therefore, in order to use the above-mentioned tool 22 between the rear end of the oil pan 28 fixed to the oil pan mounting portion 29 of the lower block 12 with the screw 31 and the front end of the casing 17 of the automatic transmission 16. A sufficient tool accommodating portion (space) will be secured. Further, in this embodiment, as shown in FIG. 5, a recess 12a is formed on the lower surface of the rear end of the lower block 12, so that when the tool 22 is used, the tip of the tool 22 is lowered. It does not interfere with the bottom surface of the block 12.

Since the rear end of the oil pan mounting portion 29 needs to be formed in front of the rear end of the lower block 12, the opening 30 on the rear end side is also the lower block.
It is formed at a position away from the rear end of 12 to the front. Therefore, as shown in FIGS. 3, 4, and 6, the gutter portion 33 for guiding the oil in the oil return passage 32 formed in the lower block 12 near the rear end thereof into the oil pan 28. Are formed.

In the cylinder block structure of the engine with the automatic transmission having the above configuration, the rigidity of the cylinder block 10 itself can be increased by increasing the vertical width of the lower block 12, and the upper and lower blocks 11, 12 and the automatic transmission 16 Since it is possible to increase the number of connection points with the casing 17,
The connection strength between the cylinder block 10 and the automatic transmission 16 can be increased. Moreover, since the rear end portion of the oil pan mounting portion 29 formed on the bottom wall 27 of the lower block 12 is located in front of the rear end of the lower block 12, even if the vertical width of the lower block 12 is increased. This makes it possible to easily perform the screwing work of the drive plate 18 with the tool 22 between the oil pan 28 attached to the lower block 12 and the casing 17 of the automatic transmission 16.

Further, in this embodiment, the casing 17 and the lower block
The bottom wall 27 is lowered from the viewpoint that it is effective to lower the position of the casing mounting hole 26 as much as possible in order to increase the joint rigidity with the 12.However, from this viewpoint, the bottom wall 27 is lowered. Needless to say, similarly to the above, the screwing work can be easily performed.

Although the embodiment shown in the drawings has been described above, the present invention is not limited to the embodiment described above, and the frame structure of the lower block 2 can be modified, for example.

(Effect of the Invention) As is apparent from the above description, according to the configuration of the present invention, the rear end portion of the oil pan mounting portion formed on the lower surface of the lower block is located in front of the rear end of the lower block. At the same time, a recess is formed on the lower surface of the lower block between the rear end of the oil pan mounting portion and the rear end of the lower block,
Since a tool housing for mounting the drive plate is provided between the rear end of the oil pan and the casing of the automatic transmission,
By increasing the vertical width of the lower block, the rigidity of the cylinder block itself can be improved, and the connection strength between the cylinder block and the automatic transmission can be increased while facilitating the screwing work of the drive plate.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram of a cylinder block structure of an engine with an automatic transmission showing an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a main part of the cylinder block structure shown in FIG. FIG. 3 is a plan view of the lower block. FIG. 4 is a bottom view of the lower block. FIG. 5 is a rear end view of the lower block. FIG. 6 is a sectional view of the lower block taken along line VI-VI in FIG. 10: Cylinder block 11: Upper block 12: Lower block 13: Crankshaft 16: Automatic transmission 17: Casing 18: Drive plate 26: Casing mounting hole (casing mounting part) 28: Oil pan 29: Oil pan mounting part

Claims (1)

[Scope of utility model registration request] 1. A cylinder block is divided into an upper block and a lower block, a crankshaft is supported between the blocks, and a casing mounting portion for an automatic transmission is formed at the rear ends of the upper block and the lower block. An oil pan mounting portion is formed on the lower surface of the block, an inner peripheral portion is mounted on the rear end of the crankshaft, and an outer peripheral portion is provided with a drive plate mounted on the torque converter cover of the automatic transmission. The rear end is located in front of the rear end of the lower block, and on the lower surface of the lower block,
A recess is formed between the rear end of the oil pan mounting portion and the rear end of the lower block so as to open outward from the rear end surface of the lower block to the rear end of the lower block. A cylinder block structure for an engine with an automatic transmission, characterized in that a tool accommodating portion for mounting a drive plate is provided between the portion and a casing of the automatic transmission.