JP2001163249A - Power plant frame for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power plant frame for automobile capable of significantly reducing a high-speed booming noise generated in a cabin by providing a regulating member for regulating the connecting strength of a power plant frame to a power unit or differential device and changing the connecting strength (fastening strength) of the regulating member, thereby controlling the position of the node (the part having zero amplitude of vibration) of vibration mode of the power plant frame. SOLUTION: In this power plant frame for automobile, the power plant frame 9 is provided between the power unit 3 and the differential device arranged 4 in the rear of the car body, and this power plant frame comprises the regulating member 13 for regulating the connecting strength of the power plant frame 9 to the power unit 3 or differential device 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for an automobile in which a power plant frame is provided between a power unit (engine and transmission) disposed at a front portion of a vehicle body and a differential device disposed at a rear portion of the vehicle body. Related to plant frame.

[0002]

2. Description of the Related Art Conventionally, in order to allow a movement in a roll direction from an engine drive system, a cross-section of a U-shape and along a propeller shaft has been adopted for the purpose of suppressing wind-up vibration of a rear differential device. The power plant frame is used to connect the transmission case of the transmission mounted on the front of the vehicle body and the differential case of the rear differential device, and two front and rear ends of the power plant frame are each used with two through bolts. In addition, there has been known one fixed to a transmission case and a differential case (see Japanese Patent Application Laid-Open No. 2-286472).

The above-mentioned power plant frame has an open cross-sectional shape having a U-shaped cross section in order to suppress wind-up vibration of the rear differential device and to allow movement in the roll direction from the engine drive system. Considering the attachment of the frame to the transmission case, the following problems occur due to the long holes formed in the attachment portion of the power plant frame.

That is, when engine vibrations are transmitted to a power plant frame having an open cross section, vibrations called power plant bending (primary bending resonance) are generated in the power plant frame, and the vibrations are transmitted to the rear differential device and the vehicle body. The vibration is transmitted to the passenger compartment through the panel, and the resonance between the vibration and the passenger compartment causes the engine to rotate particularly at high speed and high speed (for example, when the engine speed is about
(In the range of 00 to 7000 rpm), there is a problem that a high-speed muffled sound is generated in the vehicle interior.

As a countermeasure against such a high-speed muffled sound on the vehicle body side, there is a method of providing an insulator on the vehicle body panel surface or increasing the rigidity and weight of the vehicle body panel to change the resonance frequency. However, there is a problem that the weight increases.

On the other hand, there is also a structure in which the power plant frame itself is made of a damping steel plate to suppress generation of noise.
(Japanese Utility Model Laid-Open No. 2-115768). That is, the power plant frame is formed by joining the inner frame and the outer frame to form a substantially U-shaped closed cross section, improving rigidity, increasing the natural frequency, and suppressing generation of noise due to resonance. Although the power plant frame structure is configured, in this case, there is a problem that not only the weight is increased by joining the inner and outer frames, but also it is difficult to sufficiently reduce the high-speed muffled sound generated in the vehicle interior. Was.

[0007]

SUMMARY OF THE INVENTION The present invention provides an adjusting member for adjusting the coupling strength of a power plant frame to a power unit or a differential device. Section of vibration mode of plant frame
The purpose of the present invention is to provide a power plant frame for an automobile that controls the position of a portion where the vibration amplitude is zero, thereby significantly reducing the high-speed muffled sound generated in the passenger compartment without increasing the weight. And

According to the present invention, the adjusting member, the power unit, and the power plant frame are connected and fixed to each other by a plurality of through bolts, so that the assembling property is improved and the behavior of the power unit is transmitted to the power plant frame. It is an object of the present invention to provide a power plant frame for an automobile, which can achieve both improvement in operability and improvement in mounting rigidity.

Another object of the present invention is to provide a power plant frame for an automobile in which vibration of the power plant frame can be further suppressed by welding and fixing the adjusting member and the plurality of through bolts in advance.

The present invention further improves the mounting rigidity by connecting and fixing the above-mentioned adjusting member, power unit and power plant frame to each other with U-shaped bolts.
It is an object of the present invention to provide a power plant frame for an automobile that can suppress vibration of the power plant frame and improve vibration characteristics of the power plant frame.

Further, according to the present invention, by providing a variation absorbing portion for absorbing component variations at the time of assembly at a connection portion between the power plant frame and the power unit, component variations at the time of assembly can be reliably absorbed. The purpose is to provide a power plant frame for an automobile.

Further, the present invention further comprises attaching a reinforcing member (refer to a gusset) to a portion where a vibration mode node of the power plant frame is formed. The purpose of the present invention is to provide a power plant frame for an automobile that can control the formation position of the nodes of the vibration mode of the power plant frame due to the vibration reduction effect of the vehicle, and can reduce high-speed muffled noise in the vehicle interior. And

[0013] The present invention further includes an adjusting member for adjusting the coupling strength of the power plant frame to the power unit or the differential device, and a reinforcing member provided at a portion where the vibration mode node of the power plant frame is formed. It is an object of the present invention to provide a power plant frame for an automobile which can arbitrarily control a position of a node of a vibration mode of the power plant frame to reduce a high-speed muffled sound generated in a vehicle interior.

[0014]

A vehicle power plant frame according to the present invention is a vehicle power plant frame provided with a power plant frame between a power unit and a differential device disposed behind the vehicle body. The power plant frame is provided with an adjusting member for adjusting the coupling strength to the power unit or the differential device.

In one embodiment of the present invention, a plurality of through bolts are used in a connecting portion between the power plant frame and the power unit, and the adjusting member, the power unit, and the power plant frame are connected and fixed to each other by the plurality of through bolts. It was done.

In one embodiment of the present invention, the adjustment member and a plurality of through bolts are welded and fixed in advance.

In one embodiment of the present invention, a connecting portion between the power plant frame and the power unit has a U
The adjusting member, the power unit, and the power plant frame are connected and fixed to each other with the U-shaped bolts.

In one embodiment of the present invention, the connection portion between the power plant frame and the power unit is provided with a variation absorbing portion for absorbing component variations at the time of assembly.

The power plant frame for an automobile according to the present invention is also a power plant frame for an automobile in which a power plant frame is provided between a power unit and a differential device disposed behind the vehicle body. A reinforcing member is attached to a portion where a node of a vibration mode is formed.

The power plant frame for a vehicle according to the present invention is further provided with a power plant frame provided between a power unit and a differential device disposed at the rear of the vehicle body. An adjusting member for adjusting the coupling strength to the power unit or the differential device is provided, and a reinforcing member is attached to a portion of the power plant frame where the node of the vibration mode is formed.

[0021]

According to the present invention, since the adjusting member for adjusting the coupling strength of the power plant frame to the power unit or the differential device is provided, the position of the node of the vibration mode of the power plant frame is changed by changing the coupling strength of the adjusting member. Can be controlled. As a result, the high-speed muffled sound generated in the vehicle interior can be significantly reduced without increasing the weight.

According to one embodiment of the present invention, the adjusting member, the power unit, and the power plant frame are connected and fixed to each other with a plurality of through bolts. Of the power transmission to the power plant frame, and the mounting rigidity can be improved by using a plurality of through bolts.

According to one embodiment of the present invention, the adjusting member and the plurality of through bolts are fixed by welding in advance.
Vibration of the power plant frame can be suppressed, and the vibration suppression effect can be improved.

According to one embodiment of the present invention, the adjusting member, the power unit, and the power plant frame are connected and fixed to each other with the U-shaped bolt, so that the mounting rigidity of the power plant frame is improved to improve the power plant frame. Vibration of the frame can be suppressed, and the vibration characteristics can be improved.

According to one embodiment of the present invention, the connection between the power plant frame and the power unit is provided with the variation absorbing portion for absorbing the component variation at the time of assembly, so that the component variation at the time of assembly is reliably absorbed. It is possible to improve the assemblability.

According to the present invention, since the reinforcing member is attached to the portion where the node of the vibration mode of the power plant frame is formed, by selecting the mounting position of the reinforcing member, the vibration damping effect by the weight of the reinforcing member and the effect of the reinforcing member can be obtained. Due to the vibration reduction effect, it is possible to control the position where the node of the vibration mode of the power plant frame is formed, thereby reducing high-speed muffled noise in the vehicle cabin.

According to the present invention, since both the adjusting member for adjusting the coupling strength of the power plant frame to the power unit or the differential device and the reinforcing member provided at the portion where the node of the vibration mode of the power plant frame is provided are provided. The position of the node of the vibration mode of the power plant frame can be arbitrarily controlled, and the high-speed muffled sound generated in the vehicle interior can be further reduced.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawings show a power plant frame of an automobile. In FIGS. 1 and 2, a transmission 2 is connected to a rear portion of an engine 1 disposed at a front portion of a vehicle body, and a power unit 3 is formed by both the transmissions 1 and 2. .

On the other hand, a rear differential device 4 as a reduction gear is disposed behind the vehicle body, and the output shaft of the transmission 2 and the rear differential device 4
Of the engine 1 is connected via a transmission 2, a propeller shaft 5, a rear differential device 4, and right and left axle shafts 6, 6. Thus, differential transmission to the left and right rear wheels 7, 7 is performed. In the drawing, reference numeral 8 denotes a front wheel.

A power plant frame 9 having a substantially U-shaped cross section is provided between the transmission 2 of the power unit 3 and a rear differential device 4 disposed behind the vehicle body. The power plant frame 9 is configured to have high bending rigidity and flexibility against torsion. The power plant frame 9 suppresses the wide-up vibration of the rear differential device 4 and the engine drive system. It is configured to allow movement in the roll direction from.

As shown in FIG. 3, the power plant frame 9 has horizontal portions 9b and 9c integrally formed above and below a vertical portion 9a, as shown in FIG. A plurality of through holes 10 for weight reduction are formed.

The coupling structure of the power plant frame 9 to the transmission 2 and the rear differential device 4 is configured as shown in FIGS. Referring to FIGS. 4 and 5, the structure of coupling the power plant frame 9 to the transmission 2 will be described. A mounting flange 11 is formed on a transmission case 2a, and the mounting flange 11 has a plurality of non-elongated holes, for example, two bolts. While forming the through holes 12, the upper and lower horizontal portions 9 b, 9 in the power plant frame 9 are formed.
In the connecting portion on the front end side, elongated holes 9d are formed as variation absorbing portions for absorbing variations of components during assembly.

The power plant frame 9 described above
Is fitted to the mounting flange 11 from the lateral direction, and a flat plate-shaped bracket 13 is attached to the outer surface (lower surface) of the lower horizontal portion 9c.
(So-called backing plate), the bracket 13, the power plant frame 9, and the plurality of, for example, two through bolts 14, 14 and the nuts 15, 15 are used.
The mounting flanges 11 are firmly connected and fixed to each other.

Here, the above-mentioned bracket 13 has two non-elongated insertion holes (holes for preventing run-out due to the elongated hole 9d of the horizontal portion 9c) to allow the through bolts 14 to communicate with the flat plate member. The bracket 13 is an adjusting member for adjusting the coupling strength of the power plant frame 9 to the mounting flange 11, and in this embodiment, the connection rigidity of the bracket 13 is adjusted.
(Fastening strength) is set large, and the position of the node of the vibration mode (the part where the vibration amplitude is zero) is selected for the bracket mounting portion.

A dimension adjusting plate 16 is provided at a position covering the two elongated holes 9d in the upper horizontal portion 9b of the power plant frame 9.
The plate 16 is attached so as to be dimensionally adjustable in the front-rear direction by engagement between a pair of guide holes 16a formed in the front-rear direction and the engagement pins 17 fixed to the horizontal portion 9b. The above-mentioned nut 15 may be fixed in advance by welding to the dimension adjusting plate 16 as necessary.

Next, a connection structure of the power plant frame 9 to the rear differential device 4 will be described with reference to FIGS. A mounting flange 18 is formed on the differential case 4a of the rear differential device 4,
The mounting flange 18 has a plurality of non-elongated holes, for example, two bolt through holes 19, 19, while the power plant frame 9 has holes 20, 20 formed in the upper horizontal portion 9 b on the rear end side. The stepped nuts 21 and 21 are press-fitted into the holes 20 and the sleeves 22 and 22 are pressed into the lower ends of the nuts 21 and 21 to fix the nuts 21 and 21 described above.

The power plant frame 9 described above
To the mounting flange 18 from the lateral direction, and are disposed from below so as to penetrate through the insertion holes 23 and 24 formed in the lower horizontal portion 9c of the power plant frame 9 and the bolt through holes 19 and 19 described above. By screwing the provided bolts 25, 25 to the nuts 21, 21, the power plant frame 9 and the mounting flange 18 are firmly connected and fixed to each other. A sleeve 26 is interposed between the one bolt 25 and the insertion hole 23 of the lower horizontal portion 9c of the power plant frame 9.

As shown in FIGS. 1 and 3, a gusset 27 as a reinforcing member is attached to a portion of the power plant frame 9 where a node of the vibration mode is formed, and the power plant frame 9 is closed. Is being planned.

The above-mentioned gusset 27 is formed to have a substantially U-shaped cross section, and is attached to the inside of the power plant frame 9 having an open cross-sectional structure to form partial closed cross-sections 28 and 29. The gusset 27 is attached to an intermediate portion in the front-rear direction of the power plant frame 9 extending in the front-rear direction.

The operation of the power plant frame for an automobile configured as described above will be described below. When the engine 1 is driven, the vibration of the engine 1 is transmitted to the power plant frame 9 via the transmission case 2a.

In particular, when the engine 1 is running at high speed and high speed, vibrations called power plant bending (primary bending resonance) are generated in the power plant frame 9 described above.
A bracket 13 for adjusting the coupling strength is provided at a portion to be fastened to the transmission case 2a, and by changing the coupling strength of the bracket 13, the node of the vibration mode of the power plant frame 9, that is, the amplitude of the vibration becomes zero. In this embodiment, the position of the node of the vibration mode is set in the bracket mounting portion according to the coupling strength of the bracket 13 in this embodiment. It could be significantly reduced.

Further, since a flat plate is used as the bracket 13 described above, the surface pressure between the bracket 13 and the horizontal portion 9c is improved, so that the bonding strength can be increased. Although not shown in the drawings for convenience of illustration, a flat washer or a spring washer is interposed between the head of the bolt 14 and the bracket 13 and between the nut 15 and the dimension adjusting plate 16 as necessary. Is established. Here, a large diameter washer may be selected as a washer provided between the head of the bolt 14 and the bracket 13 so as to further improve the surface pressure.

As described above, according to the embodiment shown in FIGS. 1 to 7 (an embodiment corresponding to claims 1, 2, 5, 6, and 7),
Since the bracket 13 as an adjusting member for adjusting the coupling strength of the power plant frame 9 to the power unit 3 is provided, the position of the node of the vibration mode of the power plant frame 9 can be controlled by changing the coupling strength of the bracket 13. Can be. As a result, the sound pressure level of the high-speed muffled sound generated in the vehicle interior can be significantly reduced (specifically, about 4 dB lower) without increasing the weight.

Since the bracket 13, the power unit 3, and the power plant frame 9 as the above-mentioned adjusting members are connected and fixed to each other by the plurality of through bolts 14, 14, the use of the through bolts 14, 14 facilitates assembly. Improvement and behavior of power unit 3
In addition, it is possible to improve compatibility with the transmission of the power to the motor, and to improve the mounting rigidity by using a plurality of through bolts 14.

Further, since a variation absorbing portion (see a long hole 9d) for absorbing variation in parts at the time of assembly is provided at a connecting portion between the power plant frame 9 and the power unit 3,
Part variation during assembly can be reliably absorbed,
The assemblability can be improved.

In addition, since the reinforcing member (see gusset 27) is attached to the portion of the power plant frame 9 where the vibration mode node is formed, the reinforcing member (see gusset 27) is selected by selecting the mounting position of the reinforcing member (see gusset 27). Due to the vibration damping effect of the weight of the gusset 27) and the vibration reduction effect of the reinforcing member (see the gusset 27), the formation position of the node of the vibration mode of the power plant frame 9 can be controlled. High-speed muffled sound in the vehicle cabin can be reduced.

Further, an adjusting member (see bracket 13) for adjusting the coupling strength of the power plant frame 9 to the power unit 3 and a reinforcing member (see gusset 27) provided at a portion of the power plant frame 9 where the node of the vibration mode is formed. Therefore, the position of the node of the vibration mode of the power plant frame 9 can be arbitrarily controlled, and the high-speed muffled sound generated in the vehicle interior can be further reduced.

FIG. 8 shows another embodiment of a power plant frame of an automobile. In this embodiment, two through bolts 14 for connecting the front end side of the power plant frame 9 to the mounting flange 11 of the transmission case 2a are provided. 14
And a bracket 13 as an adjustment member are fixed by welding in advance.

When the adjusting member (see the bracket 13) and the plurality of through bolts 14 are fixed by welding in advance, the vibration of the bracket 13 and the power plant frame 9 is suppressed, and the vibration damping effect is reduced. Improvement can be achieved.

In this embodiment shown in FIG.
Other configurations, operations, and effects are almost the same as those of the previous embodiment. Therefore, in FIG. 8, the same portions as those of FIG.

FIG. 9 shows still another embodiment of a power plant frame of an automobile. In the above embodiment, the power plant frame 9 is attached to the mounting case 11 of the transmission case 2a by using a plurality of through bolts 14. However, in the embodiment shown in FIG.
A U-bolt 30 is used in place of the bolts 4 and 14, and the front end side of the power plant frame 9 is connected to the mounting flange 11 of the transmission case 2a by the U-bolt 30.

When the adjusting member (bracket 13), the power unit 3, and the power plant frame 9 are connected and fixed to each other with the U-shaped bolt 30, the number of parts can be reduced, and the power can be reduced. By improving the mounting rigidity of the plant frame 9, vibration of the power plant frame 9 can be suppressed, and its vibration characteristics can be improved.

In the embodiment shown in FIG. 9, the other constructions, operations and effects are almost the same as those of the previous embodiment. Therefore, in FIG. 9, the same parts as those in the previous figure are denoted by the same reference numerals. Therefore, the detailed description is omitted.

FIG. 10 shows still another embodiment of a power plant frame of an automobile. In this embodiment, a U-shaped bolt 30 for connecting the front end side of the power plant frame 9 to the mounting flange 11 of the transmission case 2a, A bracket 13 as an adjusting member is fixed by welding in advance.

When the bracket 13 and the U-shaped bolt 30 are welded and fixed in advance as described above, the vibration of the bracket 13 and the power plant frame 9 can be suppressed, and the vibration damping effect can be improved.

In this embodiment shown in FIG. 10, the other structures, operations and effects are almost the same as those of the embodiment shown in FIG. 9, and the same parts in FIG. 10 as those in FIG. The reference numerals are attached and the detailed description is omitted.

FIG. 11 shows still another embodiment of a power plant frame of an automobile. In this embodiment, when the power plant frame 9 is mounted on the mounting flanges 11 and 18 of the transmission case 2a and the differential case 4a, the power plant frame is used. Upper and lower horizontal portions 9 on the front end side of 9
Brackets 13 as adjustment members are used on the outer surfaces of the upper and lower horizontal parts 9b and 9c on the rear end side of the power plant frame 9 using bolts 4 and nuts 15, respectively. , 11 and 13 are connected and fixed to each other, and each element 1 is fixed by bolts 25 and nuts 21.
3, 9, 18, and 13 are connected and fixed to each other.

With this configuration, the position of the node of the vibration mode of the power plant frame 9 can be controlled by changing the coupling strength of the total of four brackets 13 (a plurality of adjustment members). Similar to the embodiment, the high-speed muffled sound generated in the vehicle interior can be significantly reduced.

In this embodiment shown in FIG. 11, the other constructions, operations, and effects are almost the same as those of the previous embodiment. Therefore, in FIG. Detailed description is omitted.

In the correspondence between the configuration of the present invention and the above-described embodiment, the differential device of the present invention corresponds to the rear differential device 4 of the embodiment, and similarly, the adjusting member is attached to the flat plate bracket 13. Correspondingly, the variation absorbing portion corresponds to the elongated hole 9d provided in the power plant frame 9, and the reinforcing member corresponds to the gusset 27. However, the present invention is limited to only the configuration of the above-described embodiment. is not.

For example, the number of brackets 13 to be used is not limited to one shown in FIGS. 1, 5, 8 to 10, or four shown in FIG. You may. The gusset 27 may be configured to be attached to a predetermined portion of the power plant frame 9 from outside.

[0062]

According to the present invention, by providing an adjusting member for adjusting the coupling strength of the power plant frame to the power unit or the differential device, the position of the node of the vibration mode of the power plant frame is controlled by changing the coupling strength of the adjusting member. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic right side view of an automobile provided with a power plant frame of the present invention.

FIG. 2 is a schematic plan view showing a power plant frame of the vehicle according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a plan view showing a connection structure between a power plant frame and a transmission case.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a plan view showing a coupling structure between the power plant frame and the differential case.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view showing another embodiment of the power plant frame of the vehicle according to the present invention.

FIG. 9 is a sectional view showing still another embodiment of the power plant frame for an automobile according to the present invention.

FIG. 10 is a sectional view showing still another embodiment of the power plant frame for an automobile according to the present invention.

FIG. 11 is a cross-sectional view showing still another embodiment of the power plant frame for an automobile according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Power unit 4 ... Rear differential device (differential device) 9 ... Power plant frame 9d ... Slot (variation absorption part) 13 ... Bracket (adjustment member) 14 ... Through bolt 27 ... Gusset (reinforcement member) 30 ... U-bolt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Okita 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Corporation (72) Inventor Yoshiaki Nakano 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Corporation Inside

Claims (7)

[Claims] 1. A power plant frame for an automobile, wherein a power plant frame is provided between a power unit and a differential device disposed behind the vehicle body.
A power plant frame for a motor vehicle provided with an adjusting member for adjusting a coupling strength of the power plant frame to a power unit or a differential device. 2. The power plant frame according to claim 1, wherein a plurality of through bolts are used in a connecting portion between the power plant frame and the power unit, and the adjusting member, the power unit, and the power plant frame are connected and fixed to each other by the plurality of through bolts. Automotive power plant frame. 3. The power plant frame for an automobile according to claim 2, wherein said adjusting member and a plurality of through bolts are fixed by welding in advance. 4. The vehicle according to claim 1, wherein a U-shaped bolt is used for a connecting portion between the power plant frame and the power unit, and the adjusting member, the power unit, and the power plant frame are connected and fixed to each other with the U-shaped bolt. Power plant frame. 5. A power plant frame for a motor vehicle according to claim 1, wherein a variation absorbing portion for absorbing variation in components during assembly is provided at a connecting portion between said power plant frame and said power unit. 6. A power plant frame for an automobile, wherein a power plant frame is provided between a power unit and a differential device disposed behind the vehicle body,
A power plant frame for an automobile, wherein a reinforcing member is attached to a portion where a node of a vibration mode of the power plant frame is formed. 7. A power plant frame for an automobile, wherein a power plant frame is provided between a power unit and a differential device disposed behind the vehicle body.
A power plant frame for an automobile, comprising an adjusting member for adjusting a coupling strength of the power plant frame to a power unit or a differential device, and a reinforcing member attached to a portion of the power plant frame where a node of a vibration mode is formed.