JPH0474213B2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention is a power plant in which the engine is installed vertically in the vehicle body (its crankshaft is parallel to the longitudinal direction of the vehicle).
The present invention relates to a drive device for a vehicle in which the power plant drives left and right drive wheels disposed on both the left and right sides of the power plant.

The present invention can be applied to both a power plant arranged at the front of a vehicle to drive the left and right front wheels, and a power plant arranged at the rear of the vehicle to drive the left and right rear wheels. Applicable.

(2) Prior Art Conventionally, a power plant consisting of an engine, a transmission, and a differential gear is installed vertically in a vehicle, and the output of the power plant is transmitted through an intermediate transmission shaft that is supported through the power plant. A device in which the signal is transmitted to the drive wheels is known (see Japanese Patent Publication No. 13015/1983).

(3) Problems to be Solved by the Invention However, in the conventional system, the cylinder block, the oil pan, and the differential case of the differential gear are each formed separately, so the cumulative tolerances of these three components cause problems between them. It is difficult to maintain the accuracy of the mutual mounting parts, and this causes problems such as twisting of the mounting surfaces when assembling them, and galling of the rotating shaft, etc. installed across them. To solve this problem, the machining accuracy of each individual part must be significantly improved, which causes high costs.In addition, there are many parts, which increases the assembly cost, and furthermore, the joint rigidity of the engine decreases. There is.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a novel vehicle drive system that improves the assembly accuracy and joint rigidity of the entire engine and is low in cost.

B. Arrangement of the Invention (1) Means for Solving the Problems According to the present invention, in order to achieve the above-mentioned object, a power plant including an engine, a transmission, and a differential device is provided such that the crankshaft of the engine is aligned in the longitudinal direction of the vehicle. In the drive device for a vehicle, the power plant is arranged vertically in the vehicle so as to face the engine, and the power plant drives left and right drive wheels arranged on both sides of the power plant. The axis is inclined to one side in the left and right direction of the vehicle, and an oil pan is connected to the bottom surface of the cylinder block.
The inclined cylinder side of the cylinder block is arranged so that their joint surfaces are perpendicular to the cylinder axis, parallel to the crank center surface passing through the center of the journal bearing of the crankshaft, and located below the crank center surface. A skirt portion extends downward, and a differential case body for accommodating the differential device is seamlessly and integrally formed on the skirt portion,
Further, an intermediate power transmission shaft is penetratingly supported by the skirt portion and the oil pan so as to straddle them and interlock and connect the differential device and the driving wheels on the opposite side of the device.

(2) Effect According to the above configuration, when the engine is operated,
The power is transmitted to the differential gear via the clutch, the yoke, and the propeller shaft, and from the gear via the intermediate transmission shaft, joint, drive shaft, and other joints to the driving wheels on the side facing away from the differential gear. , and is further transmitted from the differential to the drive wheels near the differential via the joint, drive shaft, and joint.

The cylinder block of the engine, which is the power unit of the power plant, has a skirt portion on the inclined side of the cylinder that extends downward for a long time so that the joint surface between the block and the oil pan has the above-mentioned positional relationship with the crank center surface. The differential case body can be seamlessly molded into the skirt part while ensuring a wide common wall area.

(3) Embodiment Next, an embodiment of the device of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic plan view of the device of the present invention, in which a power plant P in which an engine 1, a clutch 2, a transmission 3, and a differential device D are integrated into a unit is installed vertically in a vehicle V (the crank of the engine 1 is The shaft 5 is mounted parallel to the longitudinal axis of the vehicle V),
Its output is joint Jr ₁ , Jr ₂ , drive shaft Sr,
It is transmitted to the front wheels Wl, Wr as left and right drive wheels via S and joints Jr ₂ and J ₂ .

As shown in FIGS. 2 and 3, the cylinder axis L ₁ − of the engine 1 that constitutes the drive section of the power plant P
L ₁ is inclined (approximately 50°) to one side in the left and right direction of the vehicle V (to the right in the forward direction of the vehicle V) with respect to the vertical line,
A cylinder head 7 is attached to the upper surface of the cylinder block 6, which is inclined in the same direction, and a head cover 8 is bonded thereon.

In addition, an oil pan 1 is provided on the lower surface of the skirt portion ₆₁ of the cylinder block 6, which constitutes the crankcase.
3 are fastened together by a plurality of bolts 11.

Therefore, the skirt portion 6 of the cylinder block 6
₁ and the oil pan ₁₃ is a crank center plane P that is perpendicular to the cylinder axis L ₁ -L ₁ and passes through the _center O of the journal bearing 10 that supports the journal shaft portion of the crankshaft 5. ₂ −P parallel to ₂ ,
And it is below the plane _P2 - _P2 .

The journal bearing 10 is formed by a bearing half 15 formed within the skirt portion ₆₁ of the cylinder block 6 and a bearing cap 16 fixed to the bearing half 15. A journal shaft portion is rotatably supported. Therefore, this journal bearing 10 is
Joint surface between the skirt portion 6 ₁ and the oil pan 13
It is above P ₁ −P ₁ .

The skirt portion ₆₁ on the tilted side of the cylinder block 6 of the engine 1 has _a joint surface P1- _P1 between the skirt portion ₆₁ and the oil pan 13 that is connected to the crank center surface _P2-
The skirt portion 6 1 is formed to extend downward so as to have the above-mentioned positional relationship with P ₂ , and the gef case body 17 ₁ accommodating the differential device D is attached to the skirt portion 6 ₁ as shown in FIG. As is obvious, they are seamlessly formed into one piece. This differential case body 1
7 The differential case lid 17 ₂ is attached to the open end surface of ₁ with the bolt 18
A sealed differential case 17 is constructed by being fixed by the above.

The skirt portion ₆₁ of the cylinder block 6 on the side of the differential case 17 and the oil pan 13 are provided with an intermediate transmission shaft 1 which is located below the crankshaft 5 and is substantially perpendicular to the shaft 5.
2 is penetrated approximately horizontally, and one end of the shaft 12 (the second
(right end in the figure) is rotatably supported by a bearing holder 19 formed in the oil pan 13 via a ball bearing 24.

Also, the other end of the intermediate transmission shaft 12 (left end in Figure 2)
passes through the skirt portion ₆₁ of the cylinder block 6, which forms the boundary wall between the crankcase and the differential case 17, and the tapered roller bearing 2 is attached to the skirt portion ₆₁ .
It is rotatably supported via 1. The end of the intermediate transmission shaft 12 that protrudes into the differential case 17 is spline-coupled to the pinion drive gear 30 of the differential device D.

The differential device D is disposed in the dead space under the tilting cylinder block 6 as described above, and the entire power plant P is formed compactly. The actuating device D has a conventionally known structure, and includes a differential housing 25 rotatably supported by the differential case 17 via diper roller bearings 21 and 22, and a differential housing 25 fixed to the outer periphery of the differential housing 25 to operate the transmission. A large diameter driven gear 26 is interlocked with the propeller shaft 4 from 3, and a pin 2 is attached to the differential housing 25.
A pair of differential pinion gears 2 supported via 7
8, 29 and a pair of pinion drive gears 30, 3 meshed with the differential pinion gears 28, 29.
As described above, one pinion drive gear 30 is spline-coupled to the inner end of the intermediate transmission shaft 12, and the other pinion drive gear 31 is spline-coupled to the joint Jr ₁ .

The inner end of the joint Jr ₁ is rotatably supported on the outer wall of the differential case 17 via a tapered roller bearing 22, and the outer end of the joint Jr ₁ is connected to the drive shaft Sr and other joint Jr ₂ as shown in FIG. It is connected to the right drive wheel Wr via. Furthermore, a joint J is provided at the outer end of the intermediate transmission shaft 12.
The inner end of joint J ₁ is spline-coupled, and the left drive wheel W is connected to the outer end of joint J ₁ via a drive shaft S and another joint J ₂ as shown in FIG.

In addition, 32, 33, 34, and 35 in the figure are oil seals.

As shown in FIGS. 2 and 3, a pair of balance shafts 3 parallel to the crankshaft 5 are provided in the crankcase of the cylinder block 6 on both sides of the crankshaft 5.
6 and 37 are rotatably supported, and each of these balance shafts 36 and 37 is supported by a pair of weights 36.
w, 37w. A pair of balance shafts 36, 3
7 is operatively connected to the crankshaft 5 via a timing transmission 38.

The timing transmission 38 includes a drive pulley 39 fixed to the crankshaft 5, a first driven pulley 40 fixed to one balance shaft 36, and a skirt portion 6 of the cylinder block 6 adjacent to and parallel to the other balance shaft 37. ₁ , a second driven pulley 41 rotatably supported by the driving and driven pulleys 39 and 4;
Endless timing zone 42, second wrapped around 0,41
It is composed of a drive gear 44 fixed to an intermediate shaft 43 adjacent to the driven pulley 41, and a driven gear 45 fixed to the other balance shaft 37 and meshing with the drive gear 44. At that time, the first and second driven pulleys 4
The number of teeth 0 and 41 is set to half the number of teeth of the drive pulley 39, and both gears 44 and 45 are set to have the same number of teeth. Therefore, both balance shafts 36, 37
are rotated in opposite directions at twice the rotation speed of the crankshaft 5, and the secondary inertia of the reciprocating mass of the engine 1 is canceled by the combined centrifugal force of both weights 36w and 37w. It's becoming like that.

When the engine 1 of the power plant P is operated now, its output is transmitted from the clutch 2 and the rotation 3 to the differential device D via the propeller shaft 4, and from the device D to the intermediate transmission shaft 12 and the joint S ₁ , drive shaft S and other joints S
₂ to the left-hand drive wheel Wr, and from there to the right-end drive wheel W via the joint Jr ₁ , the drive shaft Sr, and another joint Sr ₂ .

In the engine 1, which is the power unit of the power plant P, the cylinder block 6 and the differential case body ₁₇₁ are integrally formed, which reduces the number of parts and increases the joint rigidity of the engine 1 as a whole. The accuracy of parts assembly is improved.

Furthermore, since the joint surface between the bearing half 15 and the bearing cap 16 is perpendicular to the cylinder axis _L1 - _L1 and is on the crank center plane P2 _{- P2} , even if the cylinder block 6 is inclined, the engine 1 The explosive load during operation acts substantially perpendicularly to the joint surface between the bearing half 15 and the bearing cap 16, so that slippage does not occur on the joint surface.

In addition, since the joint surface P ₁ -P ₁ between the cylinder block 6 and the oil pan 13 is located below the crank center surface P ₂ -P ₂ , the skirt portion 6 ₁ is formed long and has an integral structure with the differential case 17. This further increases rigidity.

Furthermore, engine 1 has its cylinder axis L ₁ −L ₁
is inclined to one side, shortening its overall height and lowering its center of gravity.Also, since the differential gear D is disposed on the same side as the inclined side of the engine, the differential gear D is arranged perpendicularly to the crankshaft 5 of the power plant P. It is possible to reduce the width in the direction to make it more compact.

C. Effects of the Invention As described above, according to the present invention, the joint surface between the cylinder block and the oil pan, the cylinder axis of which is inclined, is perpendicular to the cylinder axis and parallel to the crank center surface passing through the center of the journal bearing of the crankshaft. Moreover, the skirt portion of the cylinder block on the cylinder inclined side extends downward so as to be located below the crank center surface, and the differential case body is seamlessly and integrally formed with this skirt portion, and the skirt portion An intermediate transmission shaft that interlocks and connects the differential device and the driving wheels on the opposite side of the device is passed through and supported in the oil pan and the skirt portion of the cylinder block on the inclined side of the cylinder. By making the differential case into a so-called deep skirt type with a long downward extension, the differential case body can be easily integrally molded with the differential case without any seams while ensuring a wide common wall area. and the differential case body.By integrating them, the number of parts is reduced, the structure is simplified, and the ease of assembly is improved.
The rigidity of the connection between the cylinder block and the differential case body can be increased, and the accuracy of assembly of each component can be increased.In addition, there is no need to attach or detach the cylinder block and the differential case body, making assembly easier. Improvements will be made.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic plan view of a vehicle equipped with the device of the present invention, and FIG.
The figure is a detailed cross-sectional view taken along the line of Figure 1, Figure 3 is a partial cross-sectional view taken along the line of Figure 2, and Figure 4 is a detailed cross-sectional view taken along the line of Figure 2.
FIG. 5 is a schematic diagram of the drive system of the balance shaft taken along the line in FIG. 2. D...Differential gear, _L1 - _L1 ...Cylinder axis,
O...center, P...power plant, _P2 - _P2 ...
...Crank center surface, W, Wr...Front wheel (drive wheel), V...Vehicle, 1...Engine, 3...Mission, 5...Crankshaft, 6...Cylinder block, 13...Oil pan, 17 ₁ ...Differential case body.

Claims (1)

[Claims] 1 Engine 1, transmission 3 and differential D
A power plant P equipped with a power plant P is arranged vertically in the vehicle V such that the crankshaft 5 of the engine 1 faces the longitudinal direction of the vehicle V, , right drive wheel W,
In the vehicle drive device configured to drive Wr, the engine 1 has its cylinder axis L ₁
-L ₁ is tilted to one side in the left and right direction of the vehicle V, and an oil pan 13 is located on the lower surface of the cylinder block 6.
are joined, and their joining surfaces P ₁ -P ₁ are parallel to the crank center plane P ₂ -P ₂ that is perpendicular to the cylinder axis L ₁ -L ₁ and passes through the center O of the journal bearing 10 of the crankshaft 5. , and the skirt portion 6 ₁ of the cylinder block 6 on the cylinder inclined side is located below the crank center plane P ₂ −P ₂ .
The skirt portion 6 ₁ extends downward, and a differential case body 17 ₁ accommodating the differential device D is seamlessly formed integrally with the skirt portion 6 ₁ . A vehicle drive device characterized in that an intermediate transmission shaft 12 that interlocks and connects the differential device D and the driving wheels W on the opposite side of the device D is supported through the differential device D.