JPH0220429A - Drive device of vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A6 Object of the Invention (1) Industrial Field of Application The present invention relates to a vehicle in which a power plant engine is installed vertically (its crankshaft is parallel to the longitudinal direction of the vehicle), and the power plant The present invention relates to a vehicle drive device that drives left and right drive wheels arranged on both the left and right sides.

In the present invention, the power plant is placed at the front of the vehicle.
It can be applied to both L-shaped vehicles that drive the right front wheel, and vehicles that have a power plant located at the rear of the vehicle to drive the left and right rear wheels.

(2) Conventional technology Conventionally, a power plant consisting of an engine, a transmission, and a differential device is installed vertically in a vehicle, and the output of the power plant is driven through an intermediate transmission shaft that is supported through the power plant. A vehicle drive device that transmits power to the wheels is known (see Japanese Patent Publication No. 4 B-13015).

(3) Problems to be Solved by the Invention In the drive system for such a vehicle, a differential gear and one of the drive wheels are connected to the lower part of the engine, which is the power part.
Because the connecting intermediate power transmission shaft is supported through the engine, the load placed on the engine is greater than that of a normal engine.The rigidity of the engine is increased to sufficiently withstand the applied load, and the crankshaft and intermediate power transmission shaft are supported with high precision. However, in the conventional devices, no measures have been taken to meet such requirements.

The present invention has been made in view of the above circumstances, and is a novel vehicle drive system that improves engine performance by increasing the rigidity of the engine, and in particular by increasing the support rigidity and support accuracy of the crankshaft and intermediate transmission shaft. The main purpose is to provide equipment.

B. Structure of the invention (1) Means for solving the problem According to the invention of claim 0, in order to achieve the above object,
A power plant including an engine, a transmission, and a differential gear is arranged vertically in the vehicle so that the crankshafts of the five engines face the longitudinal direction of the vehicle, and the power plant is arranged on both sides of the vehicle. In a vehicle drive system configured to drive left and right drive wheels, the engine includes: a lower case connected to the lower surface of the crankcase portion of the cylinder block, and an oil pan connected to the lower surface of the lower case. , the joint surface between the crankcase portion and the lower case is substantially horizontal, and on the same joint surface,
A first bearing half formed integrally with the crankcase portion and a first bearing cap integrally formed with the lower case and tightened and fixed to the first bearing half, the crankshaft is An intermediate transmission shaft that constitutes a first bearing that supports the journal shaft portion, and that interlocks and connects the differential device and a drive wheel on the opposite side of the device is supported through the lower case.

According to the invention set forth in claim 0, in addition to the feature set forth in claim 0, a differential case for accommodating the differential gear is integrally formed in the lower case of the engine.

According to the invention set forth in claim 0, in addition to the feature set forth in claim 0, the lower case of the engine and the differential case accommodating the differential gear are formed separately.

According to the invention of claim 0, in addition to the feature of claim 0, a second bearing half is formed integrally with the crankcase on the joint surface between the crankcase portion of the cylinder block and the lower case. and a second bearing cap that is integrally formed with the lower case and tightened and fixed to the second bearing half, forming a second bearing that supports the balance shaft of the engine.

According to the invention of claim 0, a power plant including an engine, a transmission, and a differential gear is disposed vertically in the vehicle such that the crankshaft of the engine faces in the longitudinal direction of the vehicle, and The engine has an oil pan connected to the lower surface of the crankcase of the cylinder block. is,
The joint surface between the crankcase portion and the oil pan is substantially horizontal, and at this joint surface, a first bearing half integrally formed with the crankcase portion and a first bearing half integrally formed with the oil pan, A first bearing cap that is fastened to the first bearing half constitutes a first bearing that supports the journal shaft portion of the crankshaft, and the oil pan is further provided with the differential gear and the first bearing cap that is fixed to the first bearing half. A drive device for a vehicle, characterized in that an intermediate transmission shaft that interlocks and connects drive wheels on opposite sides of the device is supported through it.

According to the invention of claim 0, the 0th or 0th
In addition to the above feature, the cylinder axis of the engine is inclined to one side in the left-right direction of the vehicle.

According to the invention in item 0, a power plant including an engine, a Mitsushiran, and a differential gear is disposed vertically in the vehicle such that the crankshaft of the engine faces in the longitudinal direction of the vehicle, and In a vehicle drive device configured to drive left and right drive wheels disposed on both sides of the plant, the engine has its cylinder axis tilted to one side in the left-right direction of the vehicle, and the engine has a cylinder axis tilted to one side in the left-right direction of the vehicle, and a crank of the cylinder block. An oil pan is joined to the lower surface of the case portion, and the joint surface between the crankcase portion and the oil pan is substantially horizontal, and at this joint surface J-, a first bearing half integral with the crankcase portion; A first bearing cap that is tightened and fixed to the first bearing half constitutes a first bearing that supports the journal shaft portion of the crankshaft, and the oil pan further includes the differential gear and the first bearing cap. An intermediate transmission shaft is supported therethrough which interlocks the drive wheels on the opposite side of the device.

(2) Action When the engine is operated, 1. The output is transmitted to the differential gear via the clutch, Mitsushiran, and propeller shaft, and from the gear to the drive wheels on the opposite side of the differential gear via the intermediate transmission shaft, joint, drive shaft, and other joints. , and from there, it is also transmitted to the drive wheels on the differential gear side via the joint drive shaft and joint.

The joint surface between the crankcase portion of the cylinder block and the lower case or oil pan is approximately horizontal, and on the joint surface, the first bearing half, which is integrally formed with the crankcase portion, and the lower case or oil pan are integrally formed. and a first bearing cap that is formed in the first bearing half and tightened and fixed to the first bearing half constitute a first bearing that supports the journal shaft of the crankshaft, thereby increasing the rigidity of the lower case or the oil pan itself. This achieves increased bonding strength between the cylinder block and the lower case or oil pan.

Further, on the joint surface, there is a second bearing half integrally formed with the crankcase portion, and a second bearing half integrally formed with the mouth case or oil pan and fastened to the second bearing half. The bearing cap forms a second bearing that supports the balance shaft of the engine, further increasing the rigidity of the lower case or oil pan itself and further increasing the bonding strength between the cylinder block and the lower case or oil pan.

Further, the cylinder axis of the engine is inclined in the axial direction of the vehicle. The differential case is formed integrally with the lower case or oil pan, or formed separately from them.

(3) Example Next, a first example of the apparatus of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a schematic plan view of the device of the present invention.
, clutch 2, mixer 9/3, and differential gear unit are installed vertically in vehicle (with the crankshaft 5 of engine 1 parallel to the fin axis of vehicle).
The output is joint, JI! ,,
Jr,, drive shaft Sr, Sj2 and joint, L
The front wheel Wff as the left and right driving wheels through the front wheel, Jr.
, Wr.

As shown in FIG. 1.2, the cylinder axis of the engine 1 that constitutes the power section of the power plant P.

1-+ is inclined (approximately 45 degrees) to one side in the left-right direction of the vehicle V (the left side in the forward direction of the vehicle) with respect to the vertical line, and the two sides of the cylinder pro-nk 6 which are inclined in the same direction are Further, a head cup 8 is polymerized and bonded onto the cylinder head 7. Also, the crankcase portion 6. of the cylinder block 6 constitutes the upper half of the crankcase. The bottom surface of the opening is approximately horizontal when the power plant P is mounted on the vehicle (2), and the lower case 9 is joined to the bottom surface of the main opening by a plurality of connecting bolts 11. The lower case 9 forms the lower half of the crankcase and is constructed to have sufficient rigidity to support an intermediate transmission shaft 12 (to be described later).
3 is fixed by a connecting bolt 14.

Crankcase portion 6 of cylinder block 6. , a first bearing half 15 for supporting the crankshaft 5 is provided at the center in the width direction. are integrally formed, and a second bearing half 15g for supporting a balance shaft 36, which will be described later, is integrally formed so as to be biased toward the negative side in the inclination direction of the cylinder block 6.

On the other hand, on the upper part of the lower case 9, there is a first bearing gear arm 16 corresponding to the first bearing half 15+, and a second bearing cap 16 corresponding to the second bearing half 15g. are integrally formed, and when the lower case 9 is joined to the crankcase portion 61, the first bearing cap 16. is the first bearing half 15. are connected together by two connecting bolts 23 to constitute the first bearing IL, which rotatably supports the journal shaft portion of the crankshaft 5, and the second bearing cap 16E is , are integrally connected to the second bearing half 15□ by two connecting bolts 24, thereby forming a second bearing B2 that rotatably supports a balance shaft 36, which will be described later.

The lower case 9 is the first case. Second bearing cap 1
By integrally forming 6+ and 16z, the rigidity of the 1.6+ and 16z is increased. Second bearing cap IL
, 16z to the crankcase portion 61 of the cylinder block 6 using the connecting bolts 23 and 24, the strength of the connection between the cylinder block 6 and the lower case 9 is increased, and the rigidity of the entire engine 1 is greatly increased.

On the side of the engine 1 opposite to the tilted side of the cylinder block 6, a differential case 17 housing a differential gear is integrally formed on one side of the cylinder block 6 and the lower case 9. A lid 1'l is attached to the open end surface of the differential case 17 with a plurality of bolts 10.

The intermediate transmission shaft 12, which is substantially orthogonal to the crankshaft 5, passes through the lower case 9 substantially horizontally, and one end of the shaft 12 (the right end in FIG. 2) is rotatably attached to the lower case 9 via a bearing holder 19. supported. That is, a bearing holder 19 is fixed to the outer wall of the lower case 9 by a plurality of poles 20, and one end of the intermediate transmission shaft 12 is rotatably supported by the bearing holder 19 via a pole bearing 19+. The other end of the intermediate transmission shaft 12 (the left side in FIG. 2) is connected to the lower case 9.
It penetrates the boundary wall between the differential case 17 and the differential case 17, and is rotatably supported by the boundary wall via a Taber roller bearing 21. An end of the intermediate transmission shaft 12 that protrudes into the differential case 17 is spline-coupled to a binion drive gear 30 of a differential device. As mentioned above, the differential gear is disposed on the opposite side of the tilting cylinder block 6 and the crankshaft 5, and the weight balance of the entire power plan is good. It has a known structure, and includes a differential housing 25 which is rotatably supported by the differential case 17 and its lid 17IL through taber roller bearings 21 and 22, and which is fixed to the outer periphery of the differential housing 25.
A large-diameter driven gear 2 that is linked to a propeller shaft 4 from
6. Consisting of a pair of differential pinion gears 2829 supported by the differential housing 25 via pins 27, and a pair of differential pinion drive gears 30 and 31 meshed with the differential pinion gears 28 and 29, one of which is The pinion drive gear 30 is spline-coupled to the inner end of the intermediate transmission shaft 12 as described above, and the pinion drive gear 30 is spline-coupled to the inner end of the intermediate transmission shaft 12. :'4 The on-drive gear 31 is spline-coupled to the joints t- and J r +. Said join l-, J r .

◇Mo; is rotatably supported by the lid 17I of the differential gear 17 via a diper roller bearing 22, and the outer end of the joint Jr+ is connected to the drive shaft S as shown in FIG.
r and the other joint Jr* to the right drive wheel W
connected to r. Further, the intermediate transmission shaft 12 has a joint J1. The inner end of the joint (Jf) is spline-coupled, and the left drive wheel Wl is connected to the outer end of the joint (Jf) via a drive shaft S2 and another joint Jtlt, as shown in FIG.

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

When the engine l of the power plant P is operated, the output is transmitted from the clutch 2,6 transmission 3 to the differential gear via the propeller shaft 4, and also to the intermediate transmission shaft 12 and the differential gear. 9 India. Jf.

It is transmitted to the left drive wheel Wp via the drive shaft Sf and other joins Jβ, and from there the join) Jr., the drive shaft Sr and the other joins 1-Jr.
, through the right drive wheel W1. It is also transmitted to

The lower case 9 has a first. Second bearing cap 16. ．． 16! Since the lower case 9 is integrally formed, the rigidity of the lower case 9 itself is increased, and the lower case 9 is connected to the crank case portion 6 of the cylinder block 6. When joining the first. The second bearing caps 16i, 16z are connected to the first bearing cap integral with the crankcase portion 61 by connecting bolts 23.24.
．． Since it is attached to the second bearing dowel, part 151.15,
The coupling strength between the cylinder block 6 and the lower case 9 is significantly increased, and the crankshaft 5 and balance shaft 3 (described later) are
The mounting accuracy of 6 has also been greatly improved.

Also number 1. Second bearing cap 16. , 1.6° is integrated with the l core case 9, reducing the number of parts and improving ease of assembly.

Furthermore, the engine IC:T and its cylinder axis.

L is inclined to one side, and the crankcase portion 6.L of the cylinder block 6 is tilted to one side. Since the joint surface between the power plan I-P and the lower case 9 becomes substantially horizontal when the power plan I-P is mounted on the vehicle v, the overall height of the engine 1 can be lowered, and its center of gravity can be lowered.

Furthermore, the lower case 9 has high rigidity as described above (and since the lower case 9 and the differential case 17 are integrated and the intermediate power transmission shaft 12 is supported through it, the support rigidity and support accuracy of the intermediate power transmission shaft 12 are is significantly increased.

As shown in FIG. 2.5, the clamp case portion 6 of the cylinder block 6. Inside, on both sides of the crankshaft 5,
A pair of balance shafts 36 and 37 parallel to the crankshaft 5
is rotatably supported by G, and these balance shafts 36.3
7 has a pair of weights 36W and 37W, respectively.

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

The timing transmission 38 is fixed to the crankshaft 5 (7), has a decoupling pulley 39, a first driven boot IJ 40 fixed to one balance shaft 36, and a cylinder block 6 adjacent to and parallel to the other balance shaft 37. A second driven pulley 4] rotatably supported on the crankcase portion 6 of the engine, an endless timing belt 42 wound around the drive and driven pulleys 38 and 39, 40, adjacent to the second driven boob IJ41. A drive gear 44 is fixed to the intermediate shaft 43 and a driven gear 45 is fixed to the other balance shaft 37 and meshes with the drive gear 44.
It consists of At that time, 1. Second driven pulley 40
, 41 are 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, both balance supports 3637 are rotated in opposite directions at twice the rotational speed of the crankshaft 5, and the total centrifugal force of both weights 36W and 37W causes the secondary weight of the reciprocating mass of the engine 1 to be rotated in opposite directions. It is designed to cancel the inertial force.

FIG. 6 shows a second embodiment of the invention.

In this second embodiment, the crankcase portion 6. of the cylinder block 6. Oil pan 13. In this case, the lower case 9 of the first embodiment is omitted by directly connecting the oil pan 13, and the intermediate transmission shaft 12 is passed through the oil pan 13.
One end of the intermediate transmission shaft 12 is rotatably supported by the oil pan 13+ via a bearing holder 19. Further, the differential case 17 is connected to the crankcase portion 61 of the cylinder block 6. ．．
! Ni oil pan 13. It is supported across the board.

This second embodiment also has the same effects as the first embodiment, the oil pan 13 serves as a lower case, and the number of parts can be reduced by omitting the lower case.

A third embodiment of the present invention is shown in FIGS. 7 and 13.

In this third embodiment, the structure of the engine, which is the power unit of the power plant, is slightly different from that of the first embodiment, but the mounting form on the vehicle and the power transmission system to the left and right drive wheels Wi and Wr are different. This is the same as that of the first embodiment.

As shown in FIG.

I7□ is inclined (approximately 45 degrees) to one side in the left-right direction of the vehicle ■ (to the right in the forward direction of the vehicle ■) with respect to the vertical line, and the cylinder axis door is located on the upper surface of the cylinder block 106 that is inclined in the same direction. 107 Furthermore, a head cover 108 is polymerized and bonded thereon. In addition, the crankcase portion 10 that constitutes the 4th half of the crankcase of the cylinder block 106
The opening lower surface of 61 is approximately horizontal when the power run I-P is mounted on the vehicle (2), and the lower case 109 is joined to this horizontal opening lower surface by a plurality of connecting bolts 111. The lower case 109 forms the lower half of the crankcase and is configured to have sufficient rigidity to support the intermediate transmission shaft 12.
Oil z<7113 is fixed to the open lower surface of the connecting pole 114.

A first bearing half 115 for supporting the crankshaft 5 is provided at the center in the width direction of the crankcase portion 106 of the cylinder block 106 . are integrally formed, and a second bearing half 1152 for supporting the balance shaft 36 biased in the direction of inclination of the cylinder block 106 is also integrally formed.

On the other hand, in the upper part of the lower case 109, the first bearing half 115. a first bearing cap 116. corresponding to the first bearing cap 116. and a second bearing cap 116. corresponding to the second bearing half 115□. are integrally formed, and the crankcase portion 106. When joining the lower case 109 to
The first bearing cap 116I is attached to the first bearing half 11.
5. are integrally connected by two connecting bolts 123 to constitute a first bearing B+, which rotatably supports the journal shaft portion of the crankshaft 5, and a second bearing cap 116. is the second bearing half 115□
are integrally connected to each other by two connecting poles 1-124, thereby forming a second bearing B that rotatably supports a balance shaft 37, which will be described later.

Similarly to the first embodiment, this third embodiment also has a lower case 109 with a first and a second bearing cap 116. ．．
116. By integrally forming the bearings 116 and 116, the rigidity of the bearings 116 and 116 are increased.
．． ．． By connecting the IIL to the crankcase portion 1061 of the cylinder block 106 with the connecting bolts 123 and 124, the strength of the connection between the cylinder block 106 and the lower case 109 is increased, and the rigidity of the entire engine 101 is significantly increased.

When the cylinder block 106 of the engine 101 is tilted around f, an example of the cylinder block 106 and the lower case 109 includes a differential case 1 that accommodates a differential gear WD.
The differential case 117 extends over the crankcase portion 106I of the cylinder block 106 and the oil pan 113 and is joined together with a plurality of bolts 118. A lid body 117 is attached to the open end surface of the differential case 117. is attached by a plurality of bolts 110.

Note that the differential case 117 may be connected to span the crankcase 106 and the lower case 109.

The intermediate transmission shaft 12, which is substantially orthogonal to the crankshaft 5, passes through the lower case 109 substantially horizontally, and one end of the shaft 12 is rotatably supported by the lower case 109 via a bearing holder 19. The other end of the intermediate transmission shaft 12 passes through the adjacent side walls of the lower case 109 and the differential case 117 and connects the taber roller bearing 21 to the differential case 117.
It is rotatably supported via. 1 of the intermediate transmission shaft 12
The end that protrudes into the life case 117 is spline-coupled to a binion drive gear 30 of a differential device.

The differential gear is disposed in the dead space under the tilting cylinder block 106 as described above, and is located in the dead space below the tilting cylinder block 106,
The whole is formed into a konbaku].

Note that the differential device D, and the left and right drive wheels W1
．． The transmission system with Wr is the same as the above-mentioned No. 1. Since there is no difference from the second embodiment, the explanation thereof will be omitted.

1. In the third embodiment of the lever, as in the first and second embodiments, the output of the power plan LP is transmitted from the differential gear to the right drive wheel Wr, and from there to the left drive wheel W1 via the intermediate transmission shaft 12. transmitted to.

The lower case 109 has a first. Second bearing cap 1
16. , IIL are integrally formed, so the lower case 1
The rigidity of 09 itself is increased, and the lower case 109
The crankcase portion 106 of the cylinder block 106.
．． 1. When joining to. Second bearing cap 1161,1
If 16t, the 17th second bearing half 1.151 is integrated with the crankcase part 1061 by connecting bolts 123 and 124.
, 115□, so the cylinder block 106
The strength of the connection between the engine and the lower case 109 is significantly increased, the rigidity of the engine 101 as a whole can be increased, and the mounting accuracy of the crankshaft 5 and balance shaft 37 is also greatly improved.

Mano: 1st. Second bearing cap 116. ．． 116,
Since it is integrated with the lower case 109, the number of parts is reduced and ease of assembly is improved.

Further, the engine 101 has its cylinder axis [, 2L, tilted to one side, and the crank case portion 106 of the cylinder block 106. The joint surface between the lower case 109 and the crankshaft 5 of the engine 101 and the balance 1 are approximately horizontal when the power plant P is mounted on the vehicle.
The mounting accuracy of it136 is also improved.

Also number 1. Since the second bearing caps 116+ and 1162 are integrated with the lower case 109, the number of parts is reduced and ease of assembly is improved.

Furthermore, the engine 101 has its cylinder axis ■7L2 inclined to one side, and the crankcase portion 106 of the cylinder block 106. Since the joint surface between the engine 101 and the lower case 109 becomes substantially water-resistant, the overall height of the engine 101 can be reduced, and its center of gravity can be lowered.

Inside the crankcase portion 106 of the cylinder block 106, there are a pair of balance shafts 36 and 37 on both sides of the crankshaft 5.
are supported, but their configuration and drive device are the same as those of the first embodiment, so their explanation will be omitted.

FIG. 9 shows a fourth embodiment of the invention.

In this fourth embodiment, the crankcase portion 106 of the cylinder block 106. This is a case in which the lower case 109 of the third embodiment is omitted by directly bonding the oil pan 113 to the lower surface of the oil pan 1131.
is penetrated, and its negative end is rotatably supported by the oil pan 1131 via the bearing holder 119, and the differential case 11/7 is supported straddling the crankcase portion 106+ of the cylinder block 106 and the oil pan 1131. .

This fourth embodiment also has the same effects as the third embodiment, and the oil pan 113. serves as the lower case 109 in the third embodiment, and the lower case 109
By omitting , the number of parts can be reduced.

C8 Effects of Invention As described above, according to the invention of claim 0, the joint surface between the crankcase portion of the cylinder block and the lower case is substantially horizontal, and the cylinder block is formed integrally with the crankcase portion on the joint surface. a first bearing half formed integrally with the lower case and fixed to the first bearing half with a fastener 4;
bearing canopy.

Since the first bearing that supports the journal shaft portion of the crankshaft is formed by As a result, the support rigidity and support accuracy of the crankshaft can be significantly increased.

Further, since the first bearing cap is integrated with the lower case, the number of parts is reduced, ease of assembly is improved, and the structure can be simplified.

Furthermore, as mentioned above, the lower case has high rigidity, and the intermediate transmission shaft is supported only by the lower case, which has a one-piece structure.
The support rigidity and support accuracy of the intermediate transmission shaft can be further improved.

According to the invention of claim 0, in addition to the feature of claim 0, since the differential case is integrally formed with the lower case, the number of parts is further reduced and ease of assembly is further improved. It is possible to further increase the rigidity of the

Roughly speaking, according to the invention of claim 0, in addition to the features of claim 0, 1. Since the lower case and the differential case are formed separately, they can be formed from different materials, and the optimal material can be selected for them.

Furthermore, according to the invention of claim 0, in addition to the feature of claim 0, a second bearing half portion is formed integrally with the crankcase portion on the joint surface of the crankcase portion and the lower case. and a second bearing cap that is formed integrally with the lower case and is tightened and fixed to the second bearing half, forming a second bearing that supports the balance shaft of the engine. Not only is the strength of the connection between the cylinder block and lower case further increased, the crankshaft and balance shaft can be supported with high rigidity and precision, while the number of parts is further reduced. Developed &liability further
9 Furthermore, according to the invention of claim No.
Joint surface of -fl! , here, a first bearing half integrally formed with the crankcase portion, and a first bearing half integrally formed with the oil pan and fixed to the first bearing half by tightening 4=1.
The bearing cap forms the first bearing that supports the journal shaft of the crankshaft, which not only increases the rigidity of the oil pan itself, but also significantly increases the strength of the connection between the cylinder block and the oil pan. As a result, the support rigidity and support accuracy of the crankshaft can be greatly improved.

In addition, since the first bearing camp is integrated with the oil pan, the number of parts is reduced, ease of assembly is achieved, and the structure is simplified. Since the intermediate transmission shaft is supported only by
The support rigidity and support accuracy of the intermediate transmission shaft can be further improved.

Further, according to the invention of claim No. Combined with the fact that the joint surface between the case part and the lower case or oil pan is approximately horizontal, this reduces the overall height of the engine and lowers its center of gravity.
I can do two things.

Furthermore, according to the invention set forth in item 0, the cylinder axis of the engine is inclined to one side in the left-right direction of the vehicle, and the joint surface between the crankcase portion and the oil pan is substantially horizontal, so that the overall height of the engine is reduced. In addition, the center of gravity can be lowered, and even though the axis of the engine cylinder is tilted, the intermediate transmission shaft can be supported only by the heel pan, increasing the support accuracy and support rigidity of the shaft. be able to.

[Brief explanation of the drawing]

1 to 5 show a first 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 diagram taken along line II-II in FIG. 3 is an enlarged sectional view taken along line m-m in FIG. 2, and FIG. 4 is an enlarged sectional view taken along line m-m in FIG.
-4/ Line arrows, side view, Figure 5 is a schematic diagram of the drive system of the balance shaft along Figure 2 V=V cotton, Figure 6 is the second embodiment of the present invention.
This shows an example, and the oil pan part is broken (see 7).
A partial front view of the engine, FIG. 7.8 shows the third embodiment of the present invention, FIG. 7 is the same plan view as FIG. 1, and FIG. The enlarged sectional view shown in FIG. 9 shows a fourth embodiment of the present invention, and is a partial front view of the engine with the oil pan portion cut away. B+...first bearing, B2...second bearing, 1]・
...Differential gear, P... Power output, ■... Vehicle, WP. W "...Front wheel (drive L, -Ll, B2-1-2
...Cylinder axis, 1.101...Engine, 2...Clutch, 3...
・Missigon, 5... Kurani/Ria, 6,106...
・Cylinder block, 6+, 106+...Crank case part, 9,109...Lower case, 12...Intermediate transmission shaft, 13.113...Oil pan, 15+, 1
15+...first bearing half, 15□, 115.・・・
- Second bearing half, 16. ．． 116. ...First bearing cap, 16□, 116□...Second bearing cap, 17,117...Differential case, 37...Balance shaft holding permit applicant Honda Motor Co., Ltd. Agent No. 1゛Physician Kendo Ochiai 1) Takashi Naka 1)

Claims (7)

[Claims] (1) A power plant including an engine, a transmission, and a differential gear is installed vertically in the vehicle such that the crankshaft of the engine faces the longitudinal direction of the vehicle, and the power plant is installed on both sides of the power plant. In a vehicle drive device configured to drive left and right drive wheels, the engine includes a lower case connected to the lower surface of the crankcase portion of the cylinder block, and an oil pan connected to the lower surface of the lower case. A joint surface between the crankcase portion and the lower case is approximately horizontal, and on this joint surface, a first bearing half integrally formed with the crankcase portion and a first bearing half integrally formed with the lower case are connected to the first bearing half portion integrally formed with the crankcase portion. A first bearing cap that is tightened and fixed to the first bearing half constitutes a first bearing that supports the journal shaft portion of the crankshaft, and the lower case further includes the differential device and the A vehicle drive device characterized in that an intermediate transmission shaft that interlocks and connects drive wheels on opposite sides is supported through the intermediate transmission shaft. (2) The vehicle drive device according to item (1), wherein a differential case for accommodating the differential device is integrally formed with a lower case of the engine. (3) The vehicle drive system according to item (1), wherein the engine lower case and the differential case that accommodates the differential device are formed separately. (4) On the joint surface between the crankcase portion of the cylinder block and the lower case, a second bearing half integrally formed with the crankcase, and a second bearing half integrally formed with the lower case. The second
The vehicle drive system according to item (1), wherein the second bearing that supports the balance shaft of the engine is formed by the bearing cap. (5) A power plant including an engine, a transmission, and a differential gear is arranged vertically in the vehicle such that the crankshaft of the engine faces the longitudinal direction of the vehicle, and the power plant is arranged on both sides of the power plant. In a vehicle drive device configured to drive left and right drive wheels, the engine has an oil pan joined to the lower surface of a crankcase portion of a cylinder block, and a joint between the crankcase portion and the oil pan. a first bearing half integral with the crankcase portion on the substantially horizontal joint surface;
a first bearing cap that is integrally formed with the oil pan and is tightened and fixed to the first bearing half, forming a first bearing that supports the journal shaft portion of the crankshaft;
Furthermore, the vehicle drive device is characterized in that an intermediate transmission shaft that interlocks and connects the differential device and a drive wheel on the opposite side of the device is supported through the oil pan. (6) The vehicle drive system according to item (1) or item (5), wherein the cylinder axis of the engine is inclined to one side in the left-right direction of the vehicle. (7) A power plant including an engine, a transmission, and a differential gear is installed vertically in the vehicle such that the crankshaft of the engine faces the longitudinal direction of the vehicle, and the power plant is installed on both sides of the power plant. In a vehicle drive device configured to drive left and right drive wheels, the engine has its cylinder axis tilted to one side in the left-right direction of the vehicle, and an oil pan is provided on the lower surface of the crankcase portion of the cylinder block. The joint surface between the crankcase portion and the oil pan is substantially horizontal, and on this joint surface, a first bearing half integral with the crankcase portion and a first bearing half are connected to each other. A first bearing cap that is tightened and fixed constitutes a first bearing that supports the journal shaft portion of the crankshaft, and the oil pan further includes the differential device and a drive wheel on the opposite side of the device. A vehicle drive device, characterized in that an intermediate transmission shaft that interlocks and connects the two is supported through the intermediate transmission shaft.