JP3308285B2 - Engine oil pan structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine oil pan structure in which an engine body and a drive system including a transmission are integrally mounted on a common engine housing.

[0002]

2. Description of the Related Art Conventionally, with respect to mounting an engine on a vehicle, as disclosed in, for example, Japanese Patent Application Laid-Open No. 1-36555, a transmission and a differential device are arranged in parallel with a crankshaft of the engine body. There is known a structure in which the device is installed.

In an engine for an automobile or the like, relatively compact auxiliary equipment such as a lubricating oil pump or water pump having a small load is arranged at the front end of the engine, and these are directly connected to a crankshaft or gear-coupled. Auxiliary equipment with a large load, such as a power steering pump or alternator, is arranged at a side position near the front end or rear end of the engine,
It is usually driven from the end of the crankshaft via a belt or chain.
In the device described in the specification of No. 3, the engine body and the transmission are mounted side by side with respect to the vehicle body and in a state where the engine body and the transmission are slanted (inclined) rearward. Auxiliary machines are arranged in a space, and these auxiliary machines are configured to be driven by a belt stretched from a crankshaft.

[0004]

By the way, even in the FF side-mounted engine, it is common to arrange a transmission in series with the engine body, so that the combined length in the vehicle width direction is shortened. Even if the transmission is installed in parallel with the crankshaft of the engine body, as described in JP-A-1-31655,
One oil pan is required for each of the engine body and the transmission (drive system), which has a problem that the structure becomes complicated and the oil capacity increases.

That is, the amount of oil normally stored in the oil pan must be such that the oil level is lower than that of the oil strainer at the time of sudden turning, sudden start, and sudden stop of the vehicle so that air is not sucked. For this purpose, a large amount of oil is stored in both the oil pan on the engine body side and the oil pan on the transmission side, so that the total amount of oil increases. In addition, since the amount of oil is reduced, the oil pan is deeply drawn or a baffle plate is formed at the bottom of the oil pan to cope with the problem. Disadvantageous.

Further, since the front end or the rear end of the oil pan of the engine generally has a ted space, there is a demand for utilizing this part to realize a compact arrangement of the auxiliary equipment. However, when the auxiliary device is arranged in the oil pan, it is necessary to strengthen the support portion of the auxiliary device so as to secure the bearing rigidity against the belt tension, or to drive the auxiliary device that is operatively connected to the crankshaft. A space for passing the shaft back and forth was required, and in any case, the volume of the oil pan had to be reduced, and the oil capacity could not be secured. for that reason,
As in the above-mentioned German Patent Specification, the ted space of the oil pan cannot be fully utilized for arranging the auxiliary equipment by the conventional technique.

Further, in an engine for a vehicle or the like,
Due to the layout in the engine room, etc., the engine body may be inclined to one side with respect to the vertical plane passing through the crankshaft, in which case the center of gravity of the engine body is biased to one side. In some cases, the eccentricity of the vehicle body may be further increased, and the eccentricity of the weight may be further promoted depending on the arrangement of the auxiliary devices.

In view of the above circumstances, the present invention is directed to an oil pan structure for an engine in which the oil pan is simplified and the amount of oil is reduced, and accessories are compactly arranged in the oil pan. vinegar Rukoto and purpose so that it can be.

[0009]

An oil pan structure for an engine according to the present invention for achieving the above Symbol purpose SUMMARY In order to achieve the above, the vehicle front
An engine which is disposed horizontally to drive the front wheels, and has an engine body and a drive system including a transmission mounted on a vehicle body
An oil pan, which is integrally provided in a common engine housing in parallel in the front-rear direction, and which is shared by the engine body and the drive system, is provided at a substantially lower portion of the center between the engine body and the drive system .
The length of the oil pan in the vehicle width direction is
By making it shorter than the length of the Linda block,
A space is formed adjacent to the end of Lupine, and auxiliary equipment is placed in the space.
It is arranged and configured .

[0010] Further, the front wheels are placed horizontally on the front of the vehicle.
A driving engine, the engine body and the transmission are arranged in parallel in the vehicle longitudinal direction , an integral oil pan is provided below the engine body and the transmission, and the length of the oil pan in the vehicle width direction is adjusted by the engine. By making it shorter than the length of the main body , a space is formed adjacent to the end of the oil pan, and auxiliary equipment is arranged in this space, thereby achieving a compact auxiliary equipment arrangement for the oil pan part. .

Further, according to the present invention, in the auxiliary machine, the engine body is inclined to one side with respect to a vertical plane including a support axis of the crankshaft, and the engine body is inclined with respect to this vertical plane on the opposite side to the inclination direction of the engine body. The auxiliary machine is arranged in a space.

[0012]

In the oil pan structure of the engine as described above, the oil pan for the engine body and the oil pan for the drive system are integrated and shared, so that the vehicle can be suddenly turned, suddenly started, and suddenly stopped. Even if a sufficient amount of oil is stored in the oil pan so that air suction does not occur, the required oil amount as a whole can be reduced.
In addition, the number of parts can be reduced and the structure can be simplified by sharing the oil pan. In particular, by disposing the oil pan substantially at the center, the amount of change in the oil level at the time of sudden turning or the like is small, and the required oil amount can be reduced.

Further, by disposing the transmission at the rear of the engine body, heat damage of the transmission can be prevented. Further, by forming the rear part of the oil pan shallow with respect to the inclined engine body, the oil depth can be reduced. It is possible to achieve compactness while ensuring the above.

Further, in the present invention, by providing an integral oil pan below the engine body and the transmission arranged in parallel, a sufficient mounting area for the oil pan can be ensured. Therefore, the oil pan can be made shorter than the length of the cylinder block while securing the volume, and the auxiliary equipment can be installed in the space adjacent to the end of the oil pan created by the oil pan. The arrangement can be realized.

In particular, in the case of an engine having a slant structure, by arranging an auxiliary device in a lower portion of the engine body on the opposite side to the direction of inclination, it is possible to correct the weight eccentricity due to the slant structure of the engine.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic side view of an engine having an oil pan structure according to a first embodiment of the present invention. In this example, an in-line 4-cylinder horizontal FF engine is shown, and is mounted such that the left side of the figure is forward of the vehicle. FIG. 2 is a front view as viewed obliquely from above in FIG. 1, and FIG. 3 is a sectional view along AA in FIG.

The engine 10 includes an engine main body 11 having a cylinder head 12 and a drive system 17 including a transmission 15 and a differential device 16 disposed in an integrated engine housing 18. A crankshaft 21 is installed in the engine body 11 along the lateral direction of the vehicle, and an upper portion of the engine body 11 is inclined rearward (to the right in FIG. 1). In addition, a balancer shaft is provided on both sides of an upper portion of the engine housing 18 for the purpose of reducing engine vibration.
22, 23 are provided. On the other hand, behind the engine body 11, a transmission shaft 24 and a drive shaft 25 (differential shaft) extending to both sides from the differential device 16 are arranged in parallel with the crankshaft 21.

The engine housing 18 is vertically moved at a position passing through the center of the crankshaft 21.
The lower housing 20 is linearly divided into a lower housing 19 and an oil pan 26. A bearing portion 27 of the crankshaft 21 is formed on a split mating surface between the main housing 19 and the lower housing 20, and a bearing portion 29 of a drive shaft 25 of the drive system 17 is formed at the rear. It is configured to support a rotating shaft.

At one end of the engine body 11,
A clutch 31 is provided on an extension of the crankshaft 21. The output of the clutch 31 is input to the transmission shaft 24 via an outer gear 32 (see FIG. 3), and the output after shifting is transmitted through a differential device 16 to the rear. Output is provided to drive the front wheels from the lower drive shafts 25 on both sides extending in the lateral direction. When driving the rear wheels, a center differential may be provided adjacent to the differential device 16 (front differential), and a propeller shaft may be installed rearward from the center differential via transfer. It is.

On the other hand, the oil pan 26 is
It is installed almost at the center lower part of the drive system 11 and the drive system 17, and its shape and its installation position are the engine body 11 (cylinder block) in the front-back direction (left-right direction in FIG. 1).
Drive shaft 25 from the bottom of
Is installed to extend to the vicinity of. Further, in the vehicle width direction along the crankshaft 21 of the engine body 11, the length of the oil pan 26 is shorter than the length of the engine housing 18 and is formed closer to the clutch 31 from the center portion,
Thereby, a space S adjacent to the end of the oil pan 26 is formed below the lower housing 20. Furthermore, in accordance with the inclined surface of the upper surface of the oil pan 26 with the lower housing 20, the rear surface is formed so that the rear portion is shallow and the front portion is formed deep, and the lower surface is formed in a substantially horizontal plane in a mounted state. I have.

The upper surface of the lower housing 20 has an engine side portion 20a provided with bearings 27 for supporting the crankshaft 21 of the engine body 11 at both ends and between the cylinders, a lower portion of a gear train portion of the transmission 15, and a differential. The transmission portion 20b surrounding the lower half of the device 16 is integrally formed, and the lower surface is formed in an opening shape smaller than the opening portion on the upper surface and conforming to the upper surface shape of the oil pan 26.

Further, in the engine 10, various auxiliary machines are provided. This auxiliary device is mainly disposed in a space S (see FIG. 2) on the side of the oil pan 26, and includes a crank pulley 21 fixed to an end of the crankshaft 21.
It is driven by a belt 36 hung from a. That is, an alternator 37 is installed at an upper part in a front part of the engine housing 18, and a water pump 38 is installed at a lower part, and an air conditioner compressor 39 is arranged at a central lower part of the engine housing 18.
The belt 36 is wound around 9a and driven. An idler 40 is interposed between the crankshaft 21 and the air conditioner compressor 39. A pipe 41 for supplying cooling water is connected from the water pump 38 to an upper portion of the engine housing 18 (cylinder block) of the engine body 11.

On the other hand, the camshaft 43 above the cylinder head 12 and the engine housing
A transmission mechanism for driving the balancer shafts 22 and 23 on the upper portion 18 is formed. That is, first, the intermediate shaft 45 is driven by the first chain 44 from the crankshaft 21, and the camshaft 43 above the intermediate shaft 45 is speed-reduced by the second chain 46. Axis 2
The second chain 23 and the third chain 47 are configured to be driven by acceleration.

As is apparent from FIG. 2, a clutch housing 49 for housing the clutch 31 is provided on one side of the engine housing 18 (the left side in FIG. 2). A power steering oil pump 50 is provided beside the oil pan 26.

Further, the engine body 11 of the oil pump 26
An accessory drive shaft 51 is provided in parallel with the crankshaft 21 in the side part. Although not shown in FIG. 3, the accessory drive shaft 51 is driven by a crankshaft 21 through a gear and a chain inside an oil pan 26, and an engine lubricating oil connected to the shaft 51. The pump is configured to operate and, as shown in FIG. 2, one side of the oil pan 26 (the left side in FIG. 2).
And is connected to the power steering oil pump 50 to drive the pump 50.

In the first embodiment of the present invention, engine oil for lubricating various parts such as the piston sliding part of the engine body 11, the bearing part 27 of the crankshaft 21, etc.
Transmission oil for lubrication of each part such as the shaft part of the transmission 15 and the differential device 16 of the drive system 17 and the gear meshing part is stored in a common oil pan 26, and an oil pump (not shown) connected to the accessory drive shaft 51. The oil is fed from the oil pan 26 to each lubricating unit with the driving of the oil pan. The engine oil and the transmission oil can use substantially the same lubricating oil. The common use of the oil pan 26 reduces the number of parts, simplifies the structure, and facilitates assembly.

The oil pan 26 is formed adjacent to the end of the oil pan 26.
Auxiliaries are compactly arranged using the space S
Rukoto is possible and that Do not. Further, by changing the depth of the oil pan 26 in front and rear in accordance with the inclination of the engine main body 11, the overall height of the engine can be reduced as a whole while securing the required volume of the oil pan 26.

FIG. 4 is a schematic side view showing a cross section of a part of a horizontal FF engine for a vehicle having an oil pan structure according to a second embodiment of the present invention. As in the first embodiment, the vehicle is mounted so that the left side in FIG. FIG. 5 is a front view, partly in section, of the engine viewed from the front of the vehicle body, and FIG. 6 is a plan view, partly in section, of an assembly of the engine including an oil pan and an auxiliary device driving device. 4 to 6, 100 is added to the reference numerals of the members common to FIGS. 1 to 3.

The engine 110 is an in-line four-cylinder engine having a cylinder head 112 and a drive system 11 including a transmission 115 and a differential device 116.
7 are arranged in parallel in an integral engine housing 118. A crankshaft 121 having a crank pulley 121a fixed to one end of the engine body 111 is installed along the vehicle width direction, and an upper portion of the engine body 111 is inclined rearward with respect to a vertical plane including the axis of the crankshaft 121. ing. Behind the engine body 111, a transmission shaft 124 and a drive shaft (differential shaft) 125 extending to both sides from the differential device 116 are arranged in parallel with the crankshaft 121.

The engine housing 118 includes a crankshaft 121
Is vertically divided into a main housing 119 and a lower housing 120 at a position passing through the center of the lower housing 1.
An oil pan 126 having an integral structure is attached to a lower portion of the unit 20. A bearing portion 127 of the crankshaft 121 is formed on a split mating surface between the main housing 119 and the lower housing 120, and a bearing portion 129 of a drive shaft 125 of a drive system 117 is formed behind the same. It is configured to support each rotating shaft. Also, the engine body
On the side opposite to the transmission 115 side of 111,
A surge tank 61 is provided at a position close to the lower housing 120, and an intake pipe 62 that communicates the surge tank 61 with a combustion chamber of each cylinder extends upward and curves to form a cylinder head.
Connected to 112.

As shown in FIG. 4, the oil pan 126 is provided with the engine body 111 and the transmission 115 because the engine body 111 is slanted rearward.
5 is formed so as to fill a substantially triangular space (as viewed from the axial direction of the crankshaft 121) formed below the engine body 111. In the longitudinal direction of the engine body 111, as shown in FIG. It is provided over a range from a position close to the torque converter housing 63 to a position retracted a predetermined distance from the front end (the right end in FIG. 5) of the lower housing 120. On the transmission 115 side, it is provided over a range extending over the entire length of the transmission 115. Have been. Thus, a space S adjacent to the front end of the oil pan 126 is formed below the lower housing 120.

An auxiliary drive shaft 151 that penetrates the oil pan 126 in a direction parallel to the crankshaft 121 is provided at a portion of the oil pan 126 on the engine body 111 side. And
An oil pan 126 is provided on the rear end side (left end side in FIG. 5) of the engine body 111 and below the torque converter housing 63.
An oil pump 64 for an automatic transmission (AT) is disposed in close proximity to the engine, and an oil pump 150 for power steering is disposed outside the AT. Is connected in series to the end. The space S is provided at the front end side (the right end side in FIG. 5) of the oil pan 126.
A water pump 138 is disposed on the auxiliary drive shaft 151.
Is connected to the end. An oil pump 66 for engine lubrication is arranged inside the oil pan side wall to which the water pump 138 is connected, and is driven by an accessory drive shaft 151 connected thereto.

The auxiliary drive shaft 151 is provided on the portion of the oil pan 126 on the engine main body 111 side as described above, so that the auxiliary drive shaft 151 is located on the upper side of the engine main body 111 with respect to the vertical plane including the axis of the crankshaft 121. On the opposite side, and engine 1
It is in a position to lower the center of gravity of 10. Therefore, the auxiliary drive shaft
The weight of each of the accessories 64, 66, 138, and 150 arranged on the 151 corrects the eccentricity of the weight of the engine body 111 due to the slant structure, and lowers the center of gravity of the engine 110.

The oil pan 126 has a partition wall 67 formed in a box shape at a position close to a side wall away from the oil pan 126. The auxiliary drive shaft 151 penetrates the partition 67, and a sprocket 68 on the driven side is mounted at a position surrounded by the box-shaped partition 67. The oil pan 126 also includes the transmission 115 of the bulkhead 67.
An extension 67a of the partition 67 is provided at a position closer to the engine rear end side, and a support member 71 for rotatably supporting the shaft 70 of the idle gear 69 is fixed to an upper end surface of the extension 67a. ing. The idle gear 69 is arranged at a position facing the eighth web 72 on the rear end side of the crankshaft 121, and its shaft portion
A drive-side sprocket 73 is fixed to the tip of 70 at a position facing the driven-side sprocket 68.

The two sprockets 68, 73 on the driven side and the driving side are connected by a chain 74. Also,
The 8th web is attached to the crankshaft 121 of the engine body 111.
A power take-out gear 75 is provided at a portion 72, and the gear 75 and the idle gear 69 are configured to mesh with each other.

With such a configuration, the power take-out gear 75
Is transmitted to the idle gear 69, and further transmitted to the accessory drive shaft 151 via the driving sprocket 73, the chain 74, and the driven sprocket 68.
The AT oil pump 64, the power steering oil pump 150, and the water pump 138 connected to the accessory drive shaft 151
And the engine lubrication oil pump 66 is driven. An oil filter 76 is attached to the front end side wall of the oil pan 126 from the outside.

Since the second embodiment of the present invention has the above-described configuration, the engine bodies 111 and 111 arranged in parallel are arranged.
And an integrated unit installed below the transmission 115
A sufficient mounting area for the oil pan 126 can be secured.
Adjust the length of the oil pan while securing the volume of the oil pan.
It is possible to make the length shorter than the length of the gin body 111.
The space S formed adjacent to the end of the oil pan 126
Utilizing, it is possible to arrange the auxiliary machines compact, also, this arrangement of the auxiliary machines, it is possible to correct the weight eccentricity of the engine 110.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an engine having an oil pan structure according to a first embodiment of the present invention.

FIG. 2 is a schematic front view as viewed from obliquely above in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a schematic side view of a part of an engine having an oil pan structure according to a second embodiment of the present invention;

FIG. 5 is a front view showing a part of the engine in section;

FIG. 6 is a plan view of an assembly including an oil pan and an auxiliary device driving device in the engine.

[Explanation of symbols]

 10, 110 engine 11, 111 engine body 15, 115 transmission 16, 116 differential device 18, 118 engine housing 21, 121 crankshaft 24, 124 transmission shaft 25, 125 drive shaft 26, 126 oil pan 38, 138 water pump 50, 150 Oil pump for power steering 51, 151 Auxiliary drive shaft 66 Oil pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI F16H 57/04 F16H 57/04 H (72) Inventor Hirose Ichiro 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation (56) References JP-A-59-58110 (JP, A) JP-A-3-37467 (JP, A) JP-A-62-191298 (JP, A) JP-A-3-50317 (JP, A) JP-A-3-61753 (JP, A) JP-A-5-39827 (JP, A) JP-A-1-285624 (JP, A) JP-A-5-56816 (JP, A) JP, U) JP-A-2-103132 (JP, U) JP-A-59-554 (JP, U) JP-A-59-125646 (JP, U) JP-A-48-22887 (JP, Y1) Patent 2942877 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02F 7/00 302 F01M 11/00 F02B 61/06 F02B 67 / 00 F16H 57/02 302 F16H 57/04

Claims (3)

(57) [Claims] 1. A vehicle which is placed laterally in front of a vehicle to drive front wheels.
An engine body and a drive system including a transmission are integrally disposed in a common engine housing in parallel in the vehicle longitudinal direction, and the engine body and the drive system are disposed substantially below the center of the engine body and the drive system. An oil pan shared with the system is installed , and the width of the oil pan
The length in the direction is the length of the cylinder block of the engine body
Shorter than the end of the oil pan
An oil pan structure for an engine, wherein a space is formed adjacent to the engine and auxiliary equipment is disposed in the space . 2. The vehicle is laid horizontally on the front of a vehicle to drive front wheels.
An engine body and a transmission are arranged in parallel in the vehicle longitudinal direction , an integral oil pan is provided below the engine body and the transmission, and the length of the oil pan in the vehicle width direction is reduced. An oil pan structure for an engine, wherein a space is formed adjacent to an end of the oil pan by making the length shorter than the length of the engine body , and an auxiliary device is disposed in the space . 3. The engine body is installed so as to be inclined to one side with respect to a vertical plane including the axis of a crankshaft, and the auxiliary device is arranged in the space on the opposite side to the inclination direction of the engine body with respect to this vertical plane. an oil pan structure according to claim 1 or 2, wherein the engine, characterized by comprising a set.