JP4899594B2 - Powertrain equipment - Google Patents

Description

The present invention relates to a powertrain device.

Some vehicles have an engine placed horizontally so that its output shaft extends in the vehicle width direction. In this case, a transmission is connected to one side of the engine in the vehicle width direction. One of the pair of left and right drive shafts extending left and right from the transmission and connected to the drive wheels is disposed so as to pass through the rear of the engine. One drive shaft disposed behind the engine is held by the engine via a holding bracket, for example, and the holding bracket is provided with a bearing portion for holding the drive shaft rotatably. Become.

On the other hand, although an intake manifold and an exhaust manifold are connected to the engine, the exhaust manifold is also arranged behind the engine because of a request for exhausting exhaust from the rear part of the vehicle. In this case, as shown in Patent Document 1, it has also been proposed to dispose a drive shaft extending in the vehicle width direction between the engine and the exhaust manifold.

JP 2000-345837 A

By the way, when the drive shaft is arranged between the engine and the exhaust manifold, the bearing portion that holds the drive shaft in a freely rotatable manner is likely to receive high heat from the exhaust manifold, especially high temperature from the collection portion of the exhaust manifold. Therefore, some measures are desired to prevent the heat damage of the bearing portion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a powertrain device capable of preventing or suppressing thermal damage to the bearing portion for the drive shaft due to high heat from the exhaust manifold. It is in.

In order to achieve the above object, the following solution is adopted in the present invention. That is, as described in claim 1 in the claims,
In the powertrain device in which the engine is disposed horizontally so that the engine output shaft extends in the vehicle width direction,
An exhaust manifold is disposed on the rear side of the engine,
A drive shaft extending in the vehicle width direction for transmitting the output of the engine to the drive wheels is disposed between the engine and the exhaust manifold,
The collection portion of the exhaust manifold is disposed offset to one side in the vehicle width direction with respect to the engine, and the bearing portion that supports the drive shaft is offset in the vehicle width direction with respect to the collection portion. It is arranged on the other side in the vehicle width direction ,
A transmission is connected to one side in the vehicle width direction of the engine,
In the vehicle width direction, the assembly portion is disposed on the side closer to the transmission, and the bearing portion is disposed on the side farther from the transmission.
The bearing portion is fixed to the engine via a holding bracket;
An upper mounting surface for the engine provided at an upper end portion of the holding bracket is positioned in the vicinity of the cooling water passage of the engine,
The engine is a rotary piston engine;
Of the rear side of the engine, an intake port to which an intake manifold is connected is arranged at the top, and an exhaust port to which the exhaust manifold is connected is arranged at the bottom,
An upper end portion of the holding bracket is fixed to the engine in the vicinity of an attachment site of the intake manifold to the engine,
The secondary air is set to be supplied from the intake system to the exhaust manifold via the secondary air supply passage.
The secondary air supply passage extends in the vehicle width direction and is integrally formed on an upper portion of a bracket portion that is an attachment portion of the exhaust manifold to the engine,
The upper end of the holding bracket is fixed to the engine on the upper side of the secondary air supply passage formed in the bracket portion and extending in the vehicle width direction and in the vicinity of the secondary air supply passage.
It is like that. According to the above solution, the exhaust manifold assembly and the bearing, which are particularly likely to be hot, are arranged offset from each other in the vehicle width direction, so that heat damage to the bearing can be prevented or suppressed.

Also, because the transmission (the casing) is large and has very good heat dissipation, heat from the exhaust manifold is absorbed as much as possible by the transmission, that is, the influence of heat from the exhaust manifold on the bearings is reduced. Thus, it is preferable for obtaining the above-described effects more sufficiently.

Furthermore, the heat received by the bearing portion is preferably released from the upper end side of the holding bracket, which is likely to become high heat, to the engine cooling water as much as possible to further prevent or suppress the heat damage of the bearing portion. Become.

Furthermore, in the rotary piston engine, the intake port and the exhaust port are opened to the rear of the engine, respectively, and the intake manifold is arranged above and near the exhaust manifold, so that the high heat of the exhaust manifold The heat of the bearing portion can be effectively released to the intake manifold as a low temperature member, and the heat damage of the bearing portion can be further prevented or suppressed.

In addition to the above, the low-temperature secondary air can be used to effectively release the heat of the bearing portion, and the vicinity of the exhaust manifold can be effectively cooled by the secondary air. The heat damage of the bearing portion can be prevented or suppressed very effectively. In addition, since the secondary air supply passage is integrally formed with the exhaust manifold, the cooling effect of the exhaust manifold by the secondary air is of course advantageous as compared with the case where it is formed separately. Is sufficiently increased in order to prevent or suppress heat damage of the bearing portion.

A preferred mode based on the above solution is as described in claim 2 and the following claims. Chi words,

Before SL upper end mounting bolts for fixing to the engine of the holding bracket, it extends to the cooling water passage last, are then way (claim 2 support). In this case, the mounting bolt for fixing the holding bracket to the engine is effectively used as a heat transfer medium, and the heat of the bearing part is released to the engine cooling water very effectively, and the heat damage of the bearing part is extremely effective. It can be prevented or suppressed.

The upper end of the front Symbol retaining bracket, at the attachment site near to the engine of the intake manifold is fixed to the engine, it is then way (claim 3 corresponds). In this case, the high heat of the exhaust manifold and the heat of the bearing portion can be released to the intake manifold, which is a low temperature member, and the heat damage of the bearing portion can be further prevented or suppressed.

According to the present invention, it is possible to prevent or suppress heat damage to the drive shaft bearing portion due to high heat from the exhaust manifold.

In FIG. 1, 1 is an engine (engine body) and 2 is a transmission. The engine 1 and the transmission 2 are integrally connected to form a power train PT and mounted on the front portion of the vehicle (see FIG. 2). Reference numerals 3R and 3L denote left and right drive wheels (front wheels in the embodiment). The engine 1 is installed horizontally, that is, its output shaft axis α extends in the vehicle width direction as indicated by a one-dot chain line. The transmission 2 has a built-in differential gear, and a pair of left and right drive shafts 4R and 4L extend outside. Each drive shaft 4R, 4L extends in the vehicle width direction. The right drive shaft 4R is disposed behind the engine 1 and is connected to the right drive wheel (right front wheel) via the right connection shaft 5R. The left drive shaft 4L is connected to the left drive wheel (left front wheel) via the left connection shaft 5L. In addition, the code | symbol 6 in FIG. 1 is a universal joint provided in the connection part of shafts.

An exhaust manifold 10 is disposed behind the engine 1, and a collective portion thereof is indicated by reference numeral 11. The downstream side of the collective portion 11 is a single collective exhaust pipe 12 that extends rearward of the vehicle. Further, the right drive shaft 4 </ b> R disposed behind the engine 1 is held by the engine 1 via a holding bracket 20. The holding bracket 20 includes a bearing portion B described later, and the drive shaft 4R is rotatably held by the bearing portion B. Although omitted in FIG. 1, as will be described later, the intake manifold is also arranged to extend rearward of the engine 1.

In the embodiment, the engine 1 is a Wankel-type rotary piston engine, and is a two-rotor type having two rotors in series. The engine 1 is a hydrogen engine that uses hydrogen as a fuel (only hydrogen or a combination of hydrogen and gasoline may be used as the fuel). As shown in FIG. 4, the engine 1 includes a first side housing 40, a first rotor housing 41, an intermediate housing 42, and a second rotor sequentially from one side in the vehicle width direction (the right side in FIG. 4) to the other side. A housing 43 and a second side housing 44 are provided. An intake port 45A is formed on the rear surface of the first side housing 40, and an intake port 45B is formed on the rear surface of the intermediate housing 42. The intake ports 45A and 45B are connected to the first rotor housing 41 ( The inner rotor). An intake port 45D is formed on the rear surface of the second side housing 44, and an intake port 45C is formed on the rear surface of the intermediate housing 42. The intake ports 45C and 45D are respectively connected to the second rotor housing. 43 (inner rotor). As described above, the intake ports 45 </ b> A to 45 </ b> D are each opened on the rear surface of the engine 1.

Similarly, exhaust ports 46 </ b> A to 46 </ b> C are opened on the rear surface of the engine 1. The exhaust port 46 </ b> A is formed in the first side housing 40, the exhaust port 46 </ b> B is formed in the intermediate housing 42, and the exhaust port 46 </ b> C is formed in the second side housing 44. The exhaust port 46A is for the first rotor housing 41 (the rotor), and the exhaust port 46C is for the second rotor housing 43 (the rotor). The exhaust port 46B in the middle is for common use where exhaust gases from the rotor housings 41 and 43 are joined together in the middle. The exhaust ports 46A to 46C are positioned below the intake ports 45A to 45D.

As shown in FIGS. 2 and 3, a surge tank (large volume portion) 30 constituting a part of the intake system is disposed above the engine 1. The surge tank 30 is introduced with intake air through an air cleaner, a throttle body, etc. (not shown). The surge tank 30 is connected to the intake ports 45 </ b> A to 45 </ b> D of the engine 1 described above via the intake manifold 31. Further, the exhaust manifold 10 described above is connected to the exhaust ports 46A to 46C. That is, the exhaust manifold 10 is configured as an independent exhaust pipe whose downstream end is independently connected to each of the exhaust ports 46A to 46C, and the downstream end of the independent exhaust pipe is assembled as the collecting portion 11 described above. . In FIG. 2, 7 is a front window glass, 8 is a steering handle, and 9 is a dash panel.

The above-described holding bracket 20 is formed in a shape as shown in FIGS. 7 to 10 with a metal having good thermal conductivity such as an aluminum alloy, and has an upper end portion and a lower end portion. (Housing). That is, the lower end portion of the holding bracket 20 is wide in the vehicle width direction, and is fixed to the lower portion of the engine 1 (housing) by the mounting bolts 21 at two positions spaced in the vehicle width direction (FIG. 3). (See FIG. 5). The mounting position by the mounting bolt 21 is set to a position lower than the exhaust ports 46A to 46C. Further, the upper end portion of the holding bracket 20 is narrow in the vehicle width direction, and is fixed to the engine 1 (housing) by a mounting bolt 22 at one location (see FIG. 5). The mounting position by the mounting bolt 22 is set to a position above the exhaust ports 46A to 46C and slightly lower than the intake ports 45A to 45D.

Next, the detail of the bearing part comprised in the upper end part of the holding bracket 20 is demonstrated. First, a through hole 20a through which the drive shaft 4R passes is formed at the upper end of the holding bracket 20 (see FIGS. 8 and 10). Around the through hole 20a, a plurality of mounting portions 20b extending in the vehicle width direction are formed (see FIGS. 7, 8, and 10), and screw holes 20c are formed in the mounting portion 20b (see FIG. 7, FIG. 8). (Refer FIG. 8, FIG. 10). A locking bracket 25 shown in FIGS. 11 and 12 is fixed to the upper end portion of the holding bracket 20. That is, the locking bracket 25 has a through hole 25a corresponding to the through hole 20a, and a plurality of mounting holes 25b around the through hole 25a. Then, with the through holes 20a and 25a aligned, the mounting bolts 27 (see FIG. 4) inserted through the mounting holes 25b are screwed into the screw holes 20c of the holding bracket 20, thereby locking brackets 25. Is fixed to the holding bracket 20 from the vehicle width direction.

As shown in FIG. 13, the bearing 28 is locked using the locking bracket 25. In FIG. 13, fine parts such as a lubricant sealing seal, a dust seal, and a seal locking part are omitted. The bearing 28 may be of an appropriate type such as a rolling bearing or a ball bearing. With the bearing 28 as the center, the above-described bearing portion B is configured by the locking bracket 25, a seal (not shown), and the like.

Here, an extension line in the vehicle width direction connecting the lower end of the attachment portion of the intake manifold 31 to the engine 1 and an extension line in the vehicle width direction connecting the lower end of the attachment portion of the exhaust manifold to the engine 1 are respectively the drive shaft 4R. And almost parallel. The holding bracket 20 has a side shape as shown in FIG. 5 and FIG. 8, and is shaped so as to straddle the vicinity of the portion where the exhaust manifold 10 is attached to the engine 1. The attachment part of the lower end of the exhaust manifold 10 to the engine 1 is positioned below the attachment part of the exhaust manifold 10 to the engine 1. Further, the attachment portion of the upper end portion of the holding bracket 20 to the engine 1 is positioned approximately in the middle in the vertical direction of the attachment portions of the intake manifold 31 and the exhaust manifold 10 to the engine 1.

A secondary air supply passage 15 is integrally formed in the bracket portion 13 which is an attachment portion of the exhaust manifold 10 to the engine 1. That is, a connecting portion 13a having a small cross-sectional area extending in the vehicle width direction is integrally formed at the upper portion of the bracket portion 13, and a secondary air supply passage 15 extending in the vehicle width direction is formed in the connecting portion 13a. Is formed. The secondary air supply passage 15 is connected to each exhaust port 46A to 46C (that is, each of the exhaust manifold 10 via the branch passages 15a to 15c formed in the bracket portion 13 when the exhaust manifold 10 is attached to the engine 1. Branched exhaust pipe). One end of the secondary air supply passage 15 in the vehicle width direction is a connecting portion 15d, and the connecting portion 15d is connected to an intake system (for example, a surge tank 30) via a secondary air pipe 16 extending in the vertical direction. It is connected to the.

The secondary air supply passage 15 is located at the upper end of the attachment portion of the exhaust manifold 10 to the engine 1, close to the bearing 27, and close to the attachment portion of the intake manifold 31 to the engine 1. Has been.

Here, as shown in FIG. 5, the mounting surface of the upper end of the holding bracket 20 to the engine 1 is close to the cooling water passage (water jacket) 48 formed in the engine 1 (housing). Is set. The tip of the mounting bolt 22 that fixes the upper end of the holding bracket 20 to the engine 1 is positioned in the immediate vicinity of the cooling water passage 48. The tip of the bolt 35 for attaching the intake manifold 31 to the engine 1 and the tip of the bolt 36 for attaching the exhaust manifold 10 to the engine 1 are also set so as to be positioned in the immediate vicinity of the cooling water passage 48, respectively. Yes.

In the above-described configuration, the bearing portion B (bearing 28) receives high heat (radiant heat) generated from the exhaust manifold 10, particularly the collecting portion 11 thereof. However, since the bearing portion B is offset and separated in the vehicle width direction with respect to the gathering portion 11 that is particularly hot, heat damage to the bearing portion B is prevented or suppressed. Since the transmission 2 (the casing thereof) is made of metal such as an aluminum alloy having a large size and excellent conductivity, the high heat from the collecting portion 11 is absorbed by the transmission 2, and this amount is set accordingly. Radiant heat from the part 11 to the bearing part B is reduced, and the heat damage of the bearing part B is further prevented or suppressed. Further, since the traveling wind from the front of the vehicle easily flows to the exhaust manifold 10, the temperature rise of the exhaust manifold 10 itself is also suppressed. In addition to the above, since the tip of the mounting bolt 36 for mounting the exhaust manifold 10 to the engine 1 is positioned in the immediate vicinity of the cooling water passage 48, the temperature increase of the exhaust manifold 10 itself is also suppressed. The heat damage of the minute bearing portion B is prevented or suppressed.

Since the bearing part B is near the low-temperature intake manifold 31, high heat can escape from the bearing part B to the intake manifold 31 (intake air inside), thereby preventing or suppressing the heat damage of the bearing part B. Will be. Since the tip of the mounting bolt 35 for mounting the intake manifold 31 to the engine 1 is positioned in the immediate vicinity of the cooling water passage 48, when the intake manifold 31 is made of metal such as aluminum alloy, the intake manifold 31 itself is also cooled by the cooling water, which is further preferable in preventing or suppressing the heat damage of the bearing portion B.

The upper end portion of the holding bracket 20 that holds the bearing portion B is attached to the engine 1 near the cooling water passage 48, and in addition to this, the tip of the mounting bolt 22 is located in the immediate vicinity of the cooling water passage 48. Therefore, the heat of the bearing portion B is effectively transmitted to the cooling water in the cooling water passage 48 via the holding bracket 20 and the mounting bolt 22, and the heat damage of the bearing portion B is extremely effective. It will be prevented or suppressed.

Since the low-temperature secondary air passes near the bearing portion B, the heat damage of the bearing portion B is thereby prevented or suppressed. Then, the secondary air itself effectively cools the exhaust manifold 10 (near the attachment portion of the engine 1) below the bearing portion B in the vehicle width direction, so that the exhaust manifold 10 ( In particular, the temperature near the bearing portion B) is suppressed from becoming high, which is preferable in preventing or suppressing heat damage to the bearing portion B.

Although the embodiments have been described above, the present invention is not limited to the embodiments, and can be appropriately changed within the scope of the claims, and includes the following cases, for example. der Ru. The fuel are use gas oil, it may be an engine of using a natural gas or the like as appropriate. The engine 1 is not limited to being mounted on the front portion of the vehicle, but may be mounted on the rear portion of the vehicle (in this case, the rear wheels are generally driving wheels ). Certainly theory, object of the present invention is not limited to what has been stated, in which implicitly includes also the cause of providing what is represented as substantially preferred or advantages.

The simplified top view which shows embodiment of this invention. The side view which shows the arrangement | positioning relationship between an engine, an exhaust manifold, and an intake manifold with respect to a vehicle. The figure which looked at the powertrain from back. A view of the engine from the rear with the intake manifold, exhaust manifold, etc. removed. The partial cross section side view which shows the attachment site | part to the engine of an intake manifold, an exhaust manifold, and a holding bracket. The exhaust manifold is viewed from the mounting surface side to the engine. The figure which looked at the holding bracket from back. The right view of FIG. X9-X9 line equivalent sectional drawing of FIG. FIG. 10 is a cross-sectional view corresponding to line X10-X10 in FIG. 8. The side view of the latching bracket attached to the upper end part of a holding bracket. X12-X12 line equivalent sectional drawing of FIG. The principal part sectional drawing which shows an example of a bearing part.

PT: powertrain α: engine output shaft axis B: bearing portion 1: engine 2: transmission 3R, 3L: drive wheel 4R, 4L: drive shaft 10: exhaust manifold 11: collecting portion 13: bracket portion (to engine Installation site)
15: Secondary air supply passage 20: Holding bracket 21: Mounting bolt (for mounting the lower end of the holding bracket to the engine)
22: Mounting bolt (For mounting the upper end of the holding bracket to the engine)
25: Locking bracket 28: Bearing 31: Intake manifold 35: Mounting bolt (for mounting the intake manifold to the engine)
36: Mounting bolt (for mounting the exhaust manifold to the engine)
45A to 45D: Intake ports 46A to 46C: Exhaust port 48: Cooling water passage

Claims (3)

In the powertrain device in which the engine is disposed horizontally so that the engine output shaft extends in the vehicle width direction,
An exhaust manifold is disposed on the rear side of the engine,
A drive shaft extending in the vehicle width direction for transmitting the output of the engine to the drive wheels is disposed between the engine and the exhaust manifold,
The collection portion of the exhaust manifold is disposed offset to one side in the vehicle width direction with respect to the engine, and the bearing portion that supports the drive shaft is offset in the vehicle width direction with respect to the collection portion. It is arranged on the other side in the vehicle width direction ,
A transmission is connected to one side in the vehicle width direction of the engine,
In the vehicle width direction, the assembly portion is disposed on the side closer to the transmission, and the bearing portion is disposed on the side farther from the transmission.
The bearing portion is fixed to the engine via a holding bracket;
An upper mounting surface for the engine provided at an upper end portion of the holding bracket is positioned in the vicinity of the cooling water passage of the engine,
The engine is a rotary piston engine;
Of the rear side of the engine, an intake port to which an intake manifold is connected is arranged at the top, and an exhaust port to which the exhaust manifold is connected is arranged at the bottom,
An upper end portion of the holding bracket is fixed to the engine in the vicinity of an attachment site of the intake manifold to the engine,
The secondary air is set to be supplied from the intake system to the exhaust manifold via the secondary air supply passage.
The secondary air supply passage extends in the vehicle width direction and is integrally formed on an upper portion of a bracket portion that is an attachment portion of the exhaust manifold to the engine,
The upper end of the holding bracket is fixed to the engine on the upper side of the secondary air supply passage formed in the bracket portion and extending in the vehicle width direction and in the vicinity of the secondary air supply passage.
A powertrain device characterized by that. In claim 1 ,
Mounting bolts for the upper end portion is fixed to the engine prior Symbol retaining bracket, it extends to the cooling water passage recent, it powertrain system according to claim. In claim 1,
The upper end of the front Symbol retaining bracket is secured to the engine at the attachment site near to the engine of the intake manifold,
A powertrain device characterized by that.

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