JPH0211418A - Drive device for vehicle - Google Patents

Abstract

PURPOSE:To enhance the assembly accuracy of an entire engine by tilting the longitudinally mounted engine to one lateral side, specifying the forming position of a mating surfaces of the engine and an oil pan located thereunder, and forming a differential case on the titled surface on the tilted side of a cylinder block. CONSTITUTION:In an arrangement of a power plant P mounted longitudinally on a vehicle V with the power plant as a unit comprising an engine 1, a clutch 2, a transmission 3, and a differential device D, the engine 1 is disposed with the cylinder axis line L1 tilted to one lateral side with respect to the vertical line. While an oil pan 13 is mated to the bottom surface of the cylinder block 6, the mating surface P1 is perpendicular to the axial line L1 and located parallel to and lower than a crank center surface P2. A differential case body 171 is formed on the side surface on the titled side of the cylinder block 6 so that an intermediate transmission shaft 12 spanning from the cylinder block 6 to the oil pan 13 and link motion connecting the differential device D to a driven wheel is passed through an supported with the differential case body.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention is directed to a power plant in which an engine is installed vertically in a vehicle body (its crankshaft is parallel to the front-rear direction of the vehicle), and the power plant enables The present invention relates to a drive device for a vehicle that drives left and right drive wheels disposed on both the left and right sides of the vehicle.

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) Conventional technology 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 transferred to a multi-unit power plant.

It is known that the transmission is transmitted to the driving wheels via an intermediate transmission shaft that is supported through the runt (Japanese Patent Publication No. 48-1).
(See Publication No. 3015).

(3) Problems to be Solved by the Invention However, in the conventional system, the cylinder block, oil pan, and differential case of the differential gear are each formed separately. It is difficult to maintain the accuracy of the mounting parts (because of this, the mounting surfaces may become strained when they are assembled,
In addition, problems such as galling occur on the rotating shafts installed across these parts, and to solve this problem, the machining accuracy of each individual part must be significantly improved, which causes high costs and increases the number of parts. In many cases, there are problems in that the assembly cost increases and the joint rigidity of the engine decreases.

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.

B1 Structure 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. The power plant is arranged vertically on the vehicle so as to face the vehicle, and the power plant drives left and right drive wheels arranged on both sides of the power plant.
In the vehicle drive device, the engine has its cylinder axis inclined to one side in the left-right direction of the vehicle, an oil pan is joined to the lower surface of the cylinder block, and their joint surfaces are perpendicular to the cylinder axis, and is parallel to the crank center surface passing through the center of the journal bearing of the crankshaft and below the coughing surface, and a differential case body is formed integrally with the inclined side surface of the cylinder block to house the differential device, Further, an intermediate transmission shaft is supported through the cylinder block and the oil pan so as to straddle them and interlock and connect the differential device and the drive wheel on the opposite side of the device.

(2) Operation According to the above configuration, when the engine is operated, its output is transmitted to the differential device via the clutch, transmission, and propeller shaft, and from the device to the intermediate transmission shaft, joint, drive shaft, and The signal is transmitted to the drive wheel on the side away from the differential device via another joint, and is further transmitted from the differential device to the drive wheel closer to the differential device via the joint, the drive shaft, and the joint.

The engine, which is the power unit of a power plant, has a cylinder block and a differential case that are integrated, has a small number of parts, has high joint strength, and has high assembly accuracy of component parts.

(3) Embodiment Next, an embodiment of the apparatus 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 the engine l
, a clutch 2, a transmission 3, and a differential gear unit are installed vertically in a vehicle (the crankshaft 5 of the engine 1 is parallel to the longitudinal axis of the vehicle).
It is installed in the joint Jx, Jr.
, drive shaft Sr, 5ffi and joint J
r,,J1. Front wheel Wf as left and right driving wheels via
, Wr.

As shown in FIGS. 2 and 3, the cylinder axis of the engine 1 that constitutes the drive section of the power plant P.

L is inclined (approximately 50 degrees) to one side in the left-right direction of the vehicle (2) (to the right in the forward direction of the vehicle) with respect to the vertical line. A head cover 8 is polymerically bonded thereon.

Further, the upper surface of an oil pan 13 is fixed to the lower surface of a skirt portion 61 of the cylinder block 6 that constitutes a crankcase with a plurality of bolts 11.

The joint surfaces P, -P, between the skirt part 6 of the cylinder block 6 and the oil pan 13 are perpendicular to the cylinder axis -L, and are journals that support the journal shaft part of the crankshaft 5. Parallel to the crank center plane Pt Pg passing through the center O of the bearing IO, and the plane P z P
It is below z.

The journal bearing 10 is formed by a bearing half 15 formed in the skirt portion 61 of the cylinder block 6 and a bearing cap 16 fixed to the bearing half 15,
A journal shaft portion of the crankshaft 5 is rotatably supported by this journal bearing IO. This journal bearing 10 is located above the joint surfaces P, -P between the skirt portion 6I and the oil pan 13.

Skirt portion on the tilting side of the cylinder block 6 of the engine 1 6. A differential case body 17+ that accommodates a differential gear is integrally formed on the outer surface of the differential case body 17.
A differential case lid 17□ is fixed to the open end surface of the differential case 17 with bolts 18, thereby forming a sealed differential case 17.

An intermediate transmission shaft 12 located below the crankshaft 5 and substantially orthogonal to the shaft 5 is passed through the skirt portion 61 of the cylinder block 6 on the differential case 17 side and the oil pan 13 substantially horizontally, and one end of the shaft 12 (right end in Figure 2) is the oil pan 13
It is rotatably supported via a ball bearing 24 in a bearing holder 19 formed in .

The other end (left end in FIG. 2) of the intermediate transmission shaft 12 passes through the skirt 61 of the cylinder block 6, which forms the boundary wall between the crankcase and the differential case 17, and passes through the skirt 61 of the cylinder block 6. is rotatably supported via a tapered roller bearing 21. The end of the intermediate transmission shaft 12 that protrudes into the differential case 17 is spline-coupled to a pinion drive gear 30 of a differential gear.

The differential gear is a cylinder block 6 that is tilted as described above.
It is disposed in the dead space below, making the entire power plant P compact. The differential device has a conventionally known structure, and includes a differential case 17 and a tapered roller bearing 2.
1.22, a differential housing 25 rotatably supported, a large-diameter driven gear 26 fixed to the outer periphery of the differential housing 25 and interlocked with the propeller shaft 4 from the mission 3, and a differential housing. 25 and a pair of pinion drive gears 30 and 31 meshed with the differential pinion gear 28.29, one of the pinion drive gears 30 being as described above. The second pinion drive gear 31 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+.

The inner end of the joint Jr. 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+ is supported via a drive shaft Sr and another joint Jr. as shown in FIG. and is connected to the right drive wheel Wr. Further, the inner end of a joint Jf is spline-coupled to the outer end of the intermediate transmission shaft 12, and the outer end of the joint Jf is connected to a drive shaft Sl and another joint Jt2t as shown in FIG. The left drive wheel WZ is connected.

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 36 and 37 parallel to the crankshaft 5 are rotatably supported on both sides of the crankshaft 5 within the crankcase of the cylinder block 6. 36.37 is a pair of weights 36W each.

It has 37w. A pair of balance shafts 36 , 37 are operatively connected to the crankshaft 5 via a timing transmission 38 .

The timing transmission device 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 6I of the cylinder block 6 adjacent to and parallel to the other balance shaft 37. A second driven boot U 41 is rotatably supported on the drive and driven pulleys 39 and 40. An endless timing belt 4 is wound around the drive and driven pulleys 39 and 40.41.
2. The drive gear 44 is fixed to the intermediate shaft 43 adjacent to the second driven pulley 41, and the driven gear 45 is fixed to the other balance shaft 37 and meshes with the drive gear 44. At that time, 1. The number of teeth of the second driven booby IJ 40.41 is set to half the number of teeth of the drive pulley 39, and both gears 44.45 are set to have the same number of teeth. When the crankshaft 5 rotates, the balance shafts 36 and 37 are rotated in opposite directions at twice the speed of the crankshaft 5, and the total centrifugal force of the weights 36w and 37w causes the engine l
The secondary inertial force of the reciprocating mass is canceled out.

When the engine 1 of the power plant P is operated, its output is transmitted from the clutch 2 and transmission 3 to the differential gear via the propeller shaft 4, and from the gear to the intermediate transmission shaft 12, joint Sf, , drive shaft S2 and other joints S! ! , 2 through the left drive wheel W
r, and from there to the right drive wheel wp via joint Jr, drive shaft Sr, and another joint Srz.

In the engine 1, which is the power unit of the power plan) P, the differential case body 171 is integrally formed with the cylinder block 6, 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 line -L and is on the crank center plane Pz Pi, even if the cylinder block 6 is tilted, the joint surface of the bearing cap 16 is Explosive load is applied to bearing half 1
5 and the bearing cap 16, so that no slippage occurs on the joint surface.

Also, the joint surface P between the cylinder block 6 and the oil pan 13
, -P are located below the crank center plane PzP2, so the skirt portion 61 is formed long and the integral structure of this and the differential case 17 further increases the rigidity.

Furthermore, the engine 1 has its cylinder axis -Ll tilted to one side to shorten its overall height and lower its center of gravity, and the differential gear is disposed on the same side as the tilted side of the engine. Therefore, the width of the power plant P in the direction perpendicular to the crankshaft 5 can be shortened and the power plant P can be made more compact.

Effects of the C0 Invention As described above, according to the present invention, the number of parts of the power plant consisting of the engine, transmission, and differential gear is reduced, simplifying the structure and improving ease of assembly, and increasing the rigidity of the connection. Furthermore, the mounting accuracy of each component can be increased.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a schematic plan view of a vehicle equipped with the device of the present invention, and Fig. 2 is a schematic plan view of a vehicle equipped with the device of the present invention;
3 is a partial sectional view along the line ■--■ in Figure 2, Figure 4 is a side view taken along the line IV-IV in Figure 2,
FIG. 5 is a schematic diagram of the drive system of the balance shaft taken along line 2-V in FIG. D... Differential gear, L, -L,... Cylinder axis, 0
...center, P...power plant, P z P
t...Crank center surface, Wf, Wr...Front wheel (
Drive wheel), ■... Vehicle, ■... Engine, 3... Mission, 5... Crankshaft, 6... Cylinder block, 13... Oil pan, 171... Differential case body

Claims (1)

[Claims] Engine (1), transmission (3) and differential gear (
A power plant (P) equipped with the engine (1
) is arranged vertically on the vehicle (V) so that its crankshaft (5) faces the longitudinal direction of the vehicle (V). Drive wheel (
In a vehicle drive device configured to drive cylinders Wl, Wr), the engine (1) has its cylinder axis (L
_1-L_1) is tilted to one side in the left-right direction of the vehicle (V), and the oil pan (13) is joined to the lower surface of the cylinder block (6), and their joint surface (P_1-P_1
) is orthogonal to the cylinder axis (L_1-L_1),
and parallel to the crank center plane (P_2-P_2) passing through the center (O) of the journal bearing (10) of the crankshaft (5) and below the plane (P_2-P_2), and in the cylinder block (6). On the inclined side surface, there is a differential case body (17_
1) is formed, and the cylinder block (6) and oil pan (13) are further provided with the differential gear (
D) and a drive wheel (Wl) on the opposite side of the device (D)
A vehicle drive device characterized in that an intermediate transmission shaft (12) interlocking and connecting the two is supported through the intermediate transmission shaft (12).