JPH07259579A - Stiffener connection device for engine - Google Patents

Abstract

PURPOSE:To improve connection rigidity and reduce engine oscillations in a stiffener connection device which connects an engine main body to a mission case by connecting a pair of stiffener members by means of a connection member, and projecting an exhaust pipe supporter at a portion of the connection member in the vicinity of a flange surface. CONSTITUTION:A mission case 2 is fastened to an end of an engine main body by means of a bolt, while the engine main body is connected to the mission case 2 by means of a stiffener. In such a structure, the stiffener is composed of front and rear stiffener members 17f, 17r obliquely extending between a lower surface of a cylinder block and an end face 2c of the mission case 2, and a connection member 20 which integrally connects the stiffener members 17f to 17r on the side of the mission case 2. The end surface of the mission case is in close contact with a flange surface 24 of the end face of the connection member 20 for connecting the mission case 2. An exhaust pipe 9 is supported by means of a support boss 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stiffener connecting device for connecting an engine body and a mission case in a vehicle engine.

[0002]

2. Description of the Related Art Conventionally, in an automobile engine, a pair of left and right stiffeners is usually provided between the engine body and the mission case in order to improve the joint rigidity between the engine body and the mission case. The rigidity of the power plant system, such as the engine, transmission, etc., decreases due to the trend toward lighter weight, which increases the vibration such as bending vibration of the power plant system, which increases the vibration transmitted to the body and deteriorates the vehicle interior sound caused by the vibration. Etc. is a problem.

In order to solve this problem, Japanese Utility Model Publication No. 62-2
In the stiffener device described in Japanese Unexamined Patent Publication No. 9639, a pair of stiffeners arranged on the left and right of the engine is integrated with a strength member that is passed between the stiffeners to form an integrated structure, and the strength member is an oil pan. It is formed so as to cover the rear part and a part of the rear end plate.

That is, the strength member is composed of a thick plate-shaped portion parallel to the rear end plate and a thick plate-shaped portion which is provided at a position corresponding to the lower portion of the oil pan and is spaced apart from the lower portion of the oil pan. In addition, the respective parts are coupled to each other to form a stiffener device having a box-shaped integrated structure that encloses the rear part of the oil pan together with the pair of stiffeners.

[0005]

By the way, in an engine in which the crankshaft is mounted in the vehicle with the width direction of the vehicle body and the exhaust port is located on the front side of the vehicle, the exhaust gas from the combustion chamber is connected by being connected to the exhaust port. An exhaust pipe leading to the atmosphere is arranged so as to extend to the rear side of the vehicle through a lower portion of an engine including an engine body and a mission case connected to the engine body.

Since this exhaust pipe is normally disposed below the connecting portion between the engine body and the transmission case,
If the box-shaped stiffener device as described above is provided in this portion, it becomes difficult to dispose the exhaust pipe so as not to interfere with the stiffener device. Moreover, it is necessary to support the exhaust pipe on the engine side. Becomes difficult.

[0007]

The present invention has been made in view of such circumstances, and in the present invention, an exhaust pipe is provided below an engine body mounted with a crankshaft oriented in the vehicle width direction. And a pair of stiffener members that connect the engine body and the transmission case in the vicinity of the lower ends of both sides of the stiffener at positions adjacent to the exhaust pipe. In the coupling device, the pair of stiffener members are joined by the joining member on the mission case side, and the joining member is formed with a flange surface that comes into contact with an end surface of the mission case in a circumferential direction, and the flange surface. A supporting portion for supporting the exhaust pipe is projected from the coupling member in the vicinity.

This stiffener connecting device is formed by integrally combining a pair of stiffener members with a connecting member extending between them, and the connecting members are circumferentially aligned with the end surface of the mission case via the flange surface. Since it closely adheres, it exerts a great rigidity, and therefore the rigidity of the coupling between the engine body and the mission case is improved, which greatly reduces the engine vibration and the vehicle interior noise caused by the engine vibration. .

Moreover, since the pair of stiffener members are joined together on the mission case side by the joining member, the exhaust pipe is passed under the pair of stiffener members extending from the joining member toward the engine body. A sufficient space can be secured.

Further, since the exhaust pipe supporting portion is formed to project from the connecting member portion whose rigidity is further enhanced by closely contacting the end face of the transmission case through the flange surface, the exhaust pipe is connected to the engine through the supporting portion. It can be firmly and easily supported on the side, whereby the exhaust pipe can be held at a predetermined position and its vibration can be suppressed.

[0011]

EXAMPLE FIG. 1 is a front view of an engine equipped with a stiffener connecting device (hereinafter referred to as stiffener) according to the present invention. This engine is composed of an engine body 1 and a mission case 2 connected to one end surface of the engine body by a bolt 3. The crankshaft extends in the engine body 1 in the left-right direction in the drawing, and this engine is a horizontal engine mounted on a vehicle with the crankshaft oriented in the vehicle body width direction. The engine body 1 is a cylinder block 4,
The transmission case 2 includes a cylinder head 5, a cylinder head cover 6 and an oil pan 7. The transmission case 2 includes a portion 2a in which a transmission device is housed and a portion 2b in which a clutch device is housed.

Exhaust ports 8 corresponding to the respective cylinders are opened on the front surface of the cylinder head 5, and one exhaust pipe 9 communicating with these exhaust ports 8 extends downward in front of the engine body 1 and It goes through the lower part of 1 and goes backward. The bottom of the oil pan 7 on the side of the mission case 2 is high, and an exhaust pipe 9 extends back and forth in a space formed below the oil pan 7. In this portion, the exhaust pipe 9 is covered with a cover member 10 from below.

FIG. 2 is a side view of the exhaust pipe 9 seen from the right side of FIG. In the illustrated embodiment, a catalytic converter 11 is provided in a portion of the exhaust pipe 9 that descends in front of the engine body 1. A portion of the exhaust pipe 9 that passes under the engine body 1 has a stay 13 that is bolted to a bracket 12 formed at a front portion of the exhaust pipe 9 at a connection portion with the catalytic converter 11.
Is supported on the front side of the lower end of the cylinder block 4, and the rear part is supported on the rear side of the lower end of the cylinder block 4 via a stay 15 bolted to a bracket 14 fixed to the exhaust pipe 9 by welding. Has been done.

The engine body 1 and the transmission case 2, which are connected to each other by the bolts 3 as described above, are further connected by the stiffener 16 to enhance the joint rigidity. It should be noted that the cylinder block 4 itself has its rigidity secured by the reinforcing ribs 33, and the mission case 2 similarly has the reinforcing ribs.
The rigidity is secured by 34. The stiffener 16 above
The transmission case 2 is arranged between an end surface portion 2c extending below the cylinder block 4 and front and rear lower surface portions 4a, 4a of the cylinder block 4, and has an overall structure as shown in FIGS. ing. 3 is a view of the passage through the exhaust pipe 9 as seen from below, and FIG. 4 is a schematic perspective view of the stiffener 16 as a whole.

The stiffener 16 has a stiffener member 17f extending obliquely between the lower surface portion 4a of the cylinder block 4 and the end surface portion 2c of the transmission case 2 on the front side of the engine, and the lower surface portion 4a and the end surface portion 2c on the rear side. And a stiffener member 17r that extends obliquely between the stiffener members 17f and 17r, and mounting bosses 18 are vertically formed at the ends of the stiffener members 17f and 17r opposite to the mission case 2. And stiffener members 17f, 17r
The upper end surfaces of these mounting bosses 18 are brought into contact with the lower surface portion 4a of the cylinder block 4, and are fastened and fixed to the corresponding lower surface portion 4a by mounting bolts 19. The rear stiffener member 17r is fastened to the cylinder block 4 at a position farther from the mission case 2 than the front stiffener member 17f.

The front and rear stiffener members 17f and 17r are connected to each other by a connecting member 20 on the mission case 2 side. The coupling member 20 extends in the circumferential direction of the mission case 2 along the end face portion 2c of the mission case 2, and has bolt holes 21f and 21r formed at relatively high positions on the front side and relatively low positions on the rear side, respectively. . The connecting member 20 has mounting bolts 22 inserted into these bolt holes 21f and 21r.
The wide flange surface 24, which is fastened to the mission case 2 by (FIG. 4) and is connected to the end surface of the mounting boss 23 surrounding the bolt hole 21f, and the end surface of the mounting boss 25 surrounding the bolt hole 21r, are brought into close contact with the end surface portion 2c. Let's do mission case 2
It is firmly fixed to.

The stiffener 16 has a high rigidity because it has an integral structure by connecting the pair of stiffener members 17f and 17r by the connecting member 20 as described above, and further, these members have a large number of reinforcing ribs 26. It is connected by and the rigidity is further enhanced. Moreover, since the coupling member 20 is in close contact with the end surface of the mission case 2 via the wide flange surface 24, the stiffener 16 connects the engine body 1 and the mission case 2 to each other, so that the coupling rigidity between the engine body 1 and the mission case 2 is increased. As a result, the vibration of the engine and the noise in the vehicle caused by the vibration are significantly reduced.

Since the stiffener members 17f and 17r extend obliquely upward from the connecting member 20 extending along the end surface 2c of the transmission case 2, the exhaust pipe 9 can be passed thereunder without interfering with them. As described above, the exhaust pipe 9 is supported on the cylinder block 4 by the stays 13 and 15 at the front portion and the rear portion, respectively. However, in order to further support the intermediate portion and ensure the support of the exhaust pipe 9, A support boss 27 is provided on the member 20 so as to project toward the exhaust pipe 9 side. 5 is a bottom view showing the vicinity of the support boss 27 of the stiffener 16 in more detail, and FIG. 6 is a sectional view taken along the line VI-VI of FIG.

The support boss 27 is a cylindrical body having an oval cross section and extending in the vertical direction, and the lower surface thereof is a support surface 28 for the exhaust pipe 9.
Has become. Then, two screw holes 29 lined up in front and rear are opened in the support surface 28. The support boss 27 is connected to the coupling member 20.
Are connected and reinforced through the reinforcing ribs 26 at the portion where the flange surface 24 is formed. Coupling member 20
This part of the mission case 2 through the flange surface 24
Since it is a portion that is in close contact with the end face 2c of the above and is supported by the end face and exhibits particularly high rigidity, the exhaust pipe 9 is reliably supported by supporting the exhaust pipe 9 through the support boss 27 at this portion. be able to.

As shown in FIGS. 1 and 3, the exhaust pipe 9 is attached to a support boss 27 via a support stay 30. Support stay
One end of the exhaust pipe 9 is screwed to a bracket 31 welded to the outer peripheral surface of the exhaust pipe 9 to extend the upper part of the exhaust pipe 9 toward the support boss 27 side and the other end along the support surface 28 of the support boss 27. As shown in FIG. 7, it is fastened to the support boss 27 by a bolt 32 screwed into the screw hole 29.

The support stay 30 includes two metal plates 30a and 30b.
Are spaced from each other in the middle, and the fastening portions at both ends are overlapped with each other. With such a configuration, vibrations from the engine side and the exhaust pipe 9 side are absorbed, and vibrations between the two are absorbed. Transmission can be effectively blocked. The front and rear stays 13 and 15 described above are also configured in the same manner.

[0022]

According to the present invention, the stiffener connecting device having high rigidity reinforces the connecting portion between the engine main body and the transmission case to greatly improve the connecting rigidity and reduce engine vibration and vehicle interior noise. While you can
A sufficient space for passing the exhaust pipe can be secured below the vicinity of the connecting portion, and the exhaust pipe can be firmly and easily supported on the engine side.

[Brief description of drawings]

FIG. 1 is a front view of an engine according to an embodiment of the present invention.

FIG. 2 is a side view showing an exhaust pipe of the engine.

FIG. 3 is a plan view of an exhaust pipe arrangement portion below the engine as viewed from below.

FIG. 4 is a schematic perspective view of a stiffener.

FIG. 5 is a bottom view near the support boss of the stiffener.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a perspective view showing a support boss and an exhaust pipe support stay.

[Explanation of symbols]

1 ... Engine body, 2 ... Mission case, 3 ... Bolt, 4 ... Cylinder block, 5 ... Cylinder head, 6 ...
Cylinder head cover, 7 ... Oil pan, 8 ... Exhaust port, 9 ... Exhaust pipe, 10 ... Cover member, 11 ... Reference converter, 12 ... Bracket, 13 ... Stay, 14 ... Bracket, 15
... Stay, 16 ... Stiffener, 17 ... Stiffener member, 18 ...
Mounting boss, 19 ... Mounting bolt, 20 ... Coupling member, 21 ... Bolt hole, 22 ... Mounting bolt, 23 ... Mounting boss, 24 ... Flange surface,
25 ... Mounting boss, 26 ... Reinforcing rib, 27 ... Support boss, 28 ... Support surface, 29 ... Screw hole, 30 ... Support stay, 31 ... Bracket, 32
… Bolts, 33, 34… Reinforcing ribs.

Claims (2)

[Claims] 1. An exhaust pipe is arranged below an engine body mounted with a crankshaft oriented in the width direction of a vehicle body, and adjacent to the exhaust pipe, near the lower ends of both sides of the engine body and the mission case. In a stiffener coupling device in which a pair of stiffener members to be coupled are coupled and disposed by a coupling member spanned between them, the pair of stiffener members are coupled by the coupling member on the mission case side, and the stiffener member is coupled to the coupling member. A stiffener connection for an engine, characterized in that a flange face is formed on an end face of the mission case along a circumferential direction, and a supporting portion for supporting the exhaust pipe is projected from the coupling member near the flange face. apparatus. 2. The stiffener connecting device according to claim 1,
An engine in which the exhaust pipe is supported on the support portion via a stay member.