JPH0712673Y2 - Power train vibration suppressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a power train vibration suppressing device configured by fixing a transmission case to an end portion of a cylinder block of a vehicle engine.

(Prior Art) In a power train system of an automobile, a cylinder block and a transmission mechanism, each of which is a heavy load, are bolted on a rear end surface of the cylinder block and a front end surface of a clutch housing integrated with the transmission case. Since they are integrated by coupling, bending vibration (power plant bending) occurs at this coupling portion, and excessive vibration is excited particularly in the resonance range, causing an unpleasant vehicle interior muffled sound.

Therefore, conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 61-70543, the lower part of the cylinder block and the transmission case are connected by a reinforcing member called a "stiffener" which is bolted to this, Although the rigidity of the joint is increased, such a reinforcing member cannot sufficiently increase the rigidity of the wall of the joint on the transmission case side that forms the opening, so the desired vibration suppression effect is obtained. Was not obtained.

(Object of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration suppression device of a power train system that can further increase the rigidity of the coupling portion and reduce the power plant bending. And

(Structure of the Invention) In the present invention, a plurality of reinforcing member mounting seat surfaces that are continuous in the engine output shaft direction are formed on the transmission case side portion of the cylinder block and the cylinder block side portion of the transmission case, respectively.
At the cylinder block side end of the transmission case, a plurality of reinforcing member mounting seat surfaces that are continuous in the direction orthogonal to the engine output shaft are formed.

On the other hand, the reinforcing member has a substantially U-shaped cross section so as to surround the lower part of the oil pan and the transmission case, and the reinforcing member is provided with a fastening bolt hole at a position corresponding to the mounting seat surface. And is fastened to the cylinder block and the transmission case.

According to the present invention, since the cylinder block and the transmission case are firmly coupled via the reinforcing member,
The wall rigidity of the transmission case opening is improved,
Thereby, the bending vibration of the power train system can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a vibration suppressing device for a power train system according to a first embodiment of the present invention, FIG. 2 is a side view of the power train system before mounting a reinforcing member, and FIG. It is a perspective view.

In FIGS. 1 and 2, reference numeral 1 denotes a cylinder block of an engine E. A cylinder head 2 is attached to an upper portion of the cylinder block 1 and an oil pan 3 is attached to a lower portion thereof. A flange 4 extending in the output shaft direction of the engine E along the cylinder block 1 is integrally formed at the lower end of the cylinder block 1.
The lower surface of the is a reinforcing member mounting seat surface 4a.

On the other hand, a transmission case 5 is attached to the rear end of the cylinder block 1, and the front portion of the transmission case 5 is a clutch housing 6. A flange 7 for attaching the transmission case 5 to the cylinder block 1 is formed in the upper part of the end portion of the clutch housing 6 on the cylinder block 1 side by extending in the vertical direction.
Is bolted to the cylinder block 1 using this flange 7. The lower end of the flange 7 is connected to a flange 8 which is formed on the outer wall of the clutch housing 6 and extends rearward so as to be located on an extension line of the flange 4 of the cylinder block 1, and the lower surface of the flange 8 is connected to the cylinder block. The reinforcing member mounting seat surface 8a is on the same plane as the reinforcing member mounting seat surface 4a and extends in the output shaft direction of the engine E.

On the other hand, the outer peripheral wall of the end portion of the clutch housing 6 on the cylinder block 1 side that forms a semicircular opening that opens to the cylinder block 1 side is connected to the output shaft of the engine E so as to follow the outer peripheral wall. A plurality of reinforcing member mounting seat surfaces 6a are formed so as to extend in a direction orthogonal to each other. Therefore, these mounting seat surfaces 6a are oriented in the radial direction of the clutch housing 6. Further, on the lower surface of the outer peripheral wall of the clutch housing 6, a reinforcing member mounting boss portion 9 is projectingly provided,
Bolt holes 10 are provided in each of the reinforcing member mounting seat surfaces 4a, 6a, 8a and the boss portion 9 (in FIG. 2, the reinforcing member mounting seat surfaces are shown).
Only bolt holes 10 of 6a are shown).

Reference numeral 11 denotes a reinforcing member that is bolted to the cylinder block 1 and the transmission case 5 to connect the cylinder block 1 and the transmission case 5. The reinforcing member 11 is, as shown in FIG. And a substantially U-shaped cross section so as to surround the lower part of the clutch housing 6, and a continuous flat flange 12 is formed at the upper end thereof in contact with the reinforcing member mounting seat surfaces 4a, 8a. Bolt holes 13 are provided at positions corresponding to the bolt holes of the reinforcing member mounting seat surfaces 4a and 8a. Further, a bolt hole 15 is formed at a position corresponding to the bolt hole 10 in a portion 14 formed on the body of the reinforcing member 11 and in contact with the mounting seat surface 6a.
Is provided, and a bolt hole 16 is also formed at a position corresponding to the bolt hole of the boss portion 9. And the reinforcing member
As shown in FIG. 1, the bolt 11 is firmly fastened to the cylinder block 1 and the transmission case 5 by bolts 17.

As is clear from the above description, in the present embodiment, the reinforcing member mounting seat surface 8a connected to the reinforcing member mounting seat surface 4a of the cylinder block 1 in the output axis direction of the engine E is profitable, and the cylinder of the clutch housing 6 is further provided. On the outer peripheral wall of the end portion on the block 1 side, a plurality of reinforcing member mounting seat surfaces 6a that are continuous in the direction orthogonal to the output shaft of the engine E are provided.
Since the cylinder block 1 and the transmission housing 5 are connected to each other by bolting the reinforcing member 11 to the 4a, 6a, and 8a, the rigidity of the connecting portion between the cylinder block 1 and the transmission housing 5 becomes extremely high. It is possible to reduce bending vibration that occurs in the.

FIG. 4 is a graph showing the vibration suppressing effect according to the present embodiment in comparison with the conventional one. In the conventional configuration, the resonance point of the vibration is within the operating rotation range of the engine E as shown by the curve B. Although muffled noise was generated in the room, according to the configuration of the present embodiment, the resonance point of vibration goes out of the operating rotation range as shown by the curve A, so that muffled noise can be prevented.

Next, FIG. 5 is a side view showing a vibration suppressing device for a power train system according to a second embodiment of the present invention, FIG. 6 is a side view of a power train before mounting a reinforcing member, and FIG. 7 is a reinforcing member. FIG.

In this embodiment, a plurality of reinforcing member mounting seat surfaces 6a 'formed on the clutch housing 6 and extending in a direction orthogonal to the output shaft of the engine E are formed facing the cylinder block 1 side. Except for this, the power train has the same configuration as that of the first embodiment described above, and therefore common parts are given the same reference numerals and redundant description is omitted. Accordingly, as shown in FIG. 7, the reinforcing member 11 'has a portion 14' corresponding to the reinforcing member mounting seat surface 6a 'having a surface in a direction orthogonal to the output shaft of the engine E. Has been formed.
Further, flanges 12 'and 12' which are respectively in contact with the reinforcing member mounting seat surfaces 4a and 8a are individually formed.

Even with such a formation, the same effect as that of the above-described first embodiment can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of the first embodiment of the present invention, FIG. 2 is a side view of the power train, FIG. 3 is a perspective view of a reinforcing member, and FIG. 4 is a graph for explaining the effect, 5 is a side view of the second embodiment of the present invention, FIG. 6 is a side view of the power train, and FIG. 7 is a perspective view of a reinforcing member. 1 ... Cylinder block, 3 ... Oil pan 4, 7, 8 ... Flange 5 ... Transmission case 6 ... Clutch housing, 9 ... Boss portion 10, 13, 15, 16 ... Bolt hole 11, 11 ' ...... Reinforcement member 12, 12 '…… Flange

Claims (1)

[Scope of utility model registration request] 1. A vibration suppressing device of a power train system in which a cylinder block of an engine having an oil pan attached to a lower portion thereof and a transmission case fixed to an end portion of the cylinder block are connected to each other by a reinforcing member bolted to them. In each of the transmission block side portion of the cylinder block and the cylinder block side portion of the transmission case, a plurality of reinforcing member mounting seat surfaces continuous in the output shaft direction of the engine are formed, and the cylinder block of the transmission case is formed. A plurality of reinforcing member mounting seat surfaces that are continuous in the direction orthogonal to the output shaft are formed at the side end portions, and a reinforcing member that is fastened to the cylinder block and the transmission case is provided in the oil pan and the transmission case. Under With a substantially U-shaped cross section so as to surround the part, in the reinforcing member,
A vibration suppressing device of a power train system, characterized in that a tightening bolt hole is provided at a position corresponding to the mounting seat surface, and is fastened to the cylinder block and the transmission case.