JPH06156092A - Power unit support device - Google Patents

Abstract

PURPOSE:To substantially improve the rigidity and durability of a fixing bracket for fitting an outer cylinder hardware of a cylindrical mount to the power unit side or the car body side. CONSTITUTION:A power unit support device is pressed and fixed at plural places in the periphery of the fixing part of an outer cylinder hardware to a mounting part 36 where a plate-like fixing bracket 16 is fixed to an outer cylinder hardware of a cylindrical mount 10 and the fixing bracket 16 is provided on one of the power unit side or the car body side. A projecting part 34 is formed between the fixing part of the outer cylinder hardware in the fixing bracket 16 and the power unit side or car body side mounting part 39 positioned opposite to the fixing part of the fixing bracket 16 in such a manner as to project in the opposite direction, thereby the contact pressure is applied to the fixing bracket 16 by the projecting part 34, so that assembling distortion is given to the fixing bracket 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit supporting device for supporting a power unit including an engine on a vehicle body through a cylindrical mount in a vibration-proof manner, and more particularly to a mounting portion of the cylindrical mount on the vehicle body side or the power unit side. The present invention relates to a technique for improving the durability of a mounting bracket to be mounted.

[0002]

2. Description of the Related Art Generally, a power unit of an automobile is supported by a vehicle body through a mount device in order to reduce vibration transmission to the vehicle body. In recent years, as such a mounting device, a cylindrical mount having a structure in which inner and outer cylindrical metal fittings arranged at a predetermined distance from each other are connected by a rubber elastic body is mainly an FF (front engine / front drive) type. It is becoming suitable for use in automobiles.

By the way, in such a tubular mount, the inner tubular metal fitting and the outer tubular metal fitting are attached to one of the power unit side and the vehicle body side.
The power unit and the vehicle body will be interposed, but in general, a flat plate-shaped mounting bracket is fixed to the outer peripheral surface of the outer tubular metal fitting to facilitate its mounting. The outer tubular fitting is attached to the power unit side or the vehicle body side via the bracket.

Further, the mounting bracket is brought into contact with a mounting portion provided on the power unit side or the vehicle body side and fixed by bolts or the like, but the mounting bracket and the mounting portion are contacted over the entire surface. When they are brought into contact with each other, a gap is partially generated due to variations in processing of the abutting surface, which tends to cause chatter vibration and the like, and there is a problem that reliability is poor. Therefore, conventionally, generally, by forming three to four mounting convex portions on the mounting portion on the power unit side or the vehicle body side, and abutting a mounting bracket on these convex portions and fixing them with bolts or the like, Due to the design, a predetermined gap was previously formed between the mounting bracket and the mounting portion.

However, since the outer cylindrical metal fitting is fixed to the central portion of the mounting bracket and it is difficult to fix it with bolts, conventionally, the above-mentioned mounting convex portion is the fixing portion of the outer cylindrical metal fitting. Since it was set around, it was unavoidable that the input vibration load caused a relatively large deflection in the central portion of the mounting bracket. Therefore, in the mounting bracket, it is necessary to secure sufficient durability and rigidity, which makes it extremely difficult to reduce the weight of the member.

[0006]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is that the durability and rigidity of a mounting bracket can be effectively improved. An object of the present invention is to provide a power unit supporting device having an improved structure, which can be advantageously reduced in weight.

[0007]

In order to solve such a problem,
A feature of the present invention is to provide a tubular mount in which an inner tubular metal member and an outer tubular metal member, which are arranged at a predetermined distance in a radial direction from each other, are connected by a rubber elastic body arranged therebetween. A plate-shaped mounting bracket is fixed to the outer tubular metal fitting of the tubular mount, and the outer tubular metal fitting is attached to the mounting portion provided on either one of the power unit side and the vehicle body side of the mounting bracket. While abutting and fixing at a plurality of locations around the fixing portion of the power unit, the inner cylinder fitting is attached to the other side of the power unit side and the vehicle body side to support the power unit with respect to the vehicle body with anti-vibration support. In a power unit supporting device made up of at least one, a fixing portion of the outer tubular metal fitting in the mounting bracket and a mounting portion of the power unit side or the vehicle body side facing the fixing portion of the mounting bracket. A protruding portion that protrudes in the opposite direction to the mounting portion, and exerts an abutting pressure on the mounting bracket at the protruding portion, thereby imparting assembly strain to the mounting bracket. is there.

[0008]

In other words, in the power unit supporting device having the structure according to the present invention as described above, the protrusion of the fixing portion of the outer tubular metal fitting in the mounting bracket prevents displacement, and the central portion of the mounting bracket is Since the protrusion directly supports the mounting portion provided on the power unit side or the vehicle body side by the projecting portion, the bending of the mounting bracket when the vibration load is input is extremely effectively reduced or prevented. To get.

Therefore, in such a power unit supporting device, the rigidity of the mounting bracket in the assembled state can be substantially improved, the amount of repeated deformation due to the input vibration load can be reduced, and its durability is advantageous. It can be secured.

Further, as described above, since the rigidity of the mounting bracket can be substantially improved and the durability can be ensured, the weight of the mounting bracket can be reduced while ensuring the required durability and the like. , It will be easier.

[0011]

The embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, a concrete example of a cylindrical mount used in the power unit supporting apparatus of the present invention is shown in FIGS. The tubular mount 10 has a structure in which an inner tubular metal fitting 12 and an outer tubular metal fitting 14 which are arranged at a predetermined distance in a radial direction from each other are connected by a rubber elastic body 15 interposed therebetween. ing.

Further, the inner tubular metal fitting 12 and the outer tubular metal fitting 14 of the tubular mount 10 are arranged so as to be eccentric to each other by a predetermined amount, and the rubber elastic body 15 connecting the inner and outer tubular metal fittings 12 and 14 to each other. The lightening holes 1 extending axially through both sides of the inner tubular member 12 sandwiching the eccentric direction.
7 and 19 are formed, and the radial spring characteristic is appropriately tuned.

In the tubular mount 10, the inner tubular metal fitting 12 is mounted on the vehicle body side, while the outer tubular metal fitting 14 is mounted on the power unit side, so that the power unit is mounted on the vehicle body mounting portion. The Rukoto. In such a mounted state, in the tubular mount 10, the power unit load is input in the eccentric direction of the inner tubular fitting 12 and the outer tubular fitting 14 (vertical direction in FIG. 3), and the rubber elastic body 15 is moved. By being deformed, the inner and outer cylindrical metal fittings 12, 14 are positioned substantially coaxially.

Further, a mounting bracket 16 is fixed to the outer cylindrical metal fitting 14 of the cylindrical mount 10 as described above.
The outer tube fitting 14 is adapted to be attached to the power unit.

The mounting bracket 16 has a substantially rectangular flat plate shape as a whole, and a first mounting plate 20 in which a vertical wall 18 is bent at one side edge portion, and the first mounting plate 2
The second mounting plate 22 is welded to the vertical wall 18 of 0 and is projected outward. Then, the bottom surface of the first mounting plate 20 and the bottom surface of the second mounting plate 22 are positioned on the same plane, and one mounting surface 24
Are formed.

Further, a metal sleeve 30 is fixed to the first mounting plate 20 at a substantially central portion on the front surface side thereof via a coupling fitting 28. And this metal sleeve 3
The tubular mount 10 is press-fitted and fixed to the inner hole 32 of 0.

Further, the first mounting plate 20 is formed with a projection 34 having a wide cross-shaped planar shape at a substantially central portion on the back surface side corresponding to the fixed portion of the metal sleeve 30. ing. In addition, it is desirable that the protrusion height of the protrusion 34 be determined based on the amount of bending that is caused in the first mounting plate 20 when a vibration load is input to the tubular mount. 5-6
A safe amount (generally,
0.2 to 0.4 mm) is added to set the protrusion height. Further, although the protruding portion 34 can be integrally formed by press molding or the like, in the present embodiment, a thin metal plate formed separately is fixed by welding or the like,
Has been formed.

In the mounting bracket 16 as described above, three mounting holes 36 are provided in the mounting surface 24 of the first and second mounting plates 20 and 22, and three mounting holes 36 are provided.
It is provided around the fixed part of 0 and
One mounting hole 38 is provided in the inclined vertical wall portion 25 formed at the longitudinal end portion of the first mounting plate 20, and the mounting bracket 16 is attached to the power unit at the positions where the mounting holes 36 and 38 are formed. It is fixed on the side.

By the way, in the present embodiment, for reasons such as improvement of workability in assembling to the power unit and installation space,
The mounting bracket 16 is attached to the power unit via the intermediate plate 39 as shown in FIGS. 5 to 7. In other words, in this embodiment, the mounting portion of the mounting bracket 16 on the power unit side is the intermediate plate 3 fixed to the power unit.
It is composed of 9.

The intermediate plate 39 is an integrally cast product and has bracket-side mounting portions 40 and 42 projecting at a predetermined height at the portions corresponding to the mounting holes 36 and 38 of the mounting bracket 16, respectively. The bracket side mounting portions 40, 42 are formed with
Each has a bolt insertion hole 44. Furthermore,
A rectangular block-shaped abutting protrusion 46 is formed at a portion corresponding to the protrusion 34 of the mounting bracket 16 in a central portion surrounded by the bracket-side mounting portions 40 and 42. In the figure, reference numeral 48 is a lightening hole for reducing the weight.

Further, the bracket side mounting portion 40 and the abutting protrusion 46 corresponding to the mounting holes 36 of the mounting bracket 16 are finished by milling or the like so that the respective protruding end faces are located on the same plane. Has been.

On the other hand, the intermediate plate 39 has
Three power unit side mounting portions 50 are formed on the opposite side of the bracket side mounting portions 40 and 42 and project at a predetermined height. Further, female screw holes 52 are formed in the three power unit side mounting portions 50, respectively. The projecting end surfaces of the power unit side mounting portions 50 are also finished by milling or the like so as to be located on the same plane.

In such an intermediate plate 39, after the bolts 54 are press-fitted and fixed to the bracket side mounting portions 40 from below, the power unit side mounting portions 50 are connected to the power unit mounting portions. By being bolted to the power unit,
It is supposed to be fixed.

Further, as shown in FIG. 8, the mounting bracket 16 is superposed on the bracket side mounting portions 40 and 42 of the intermediate plate 39 fixed to the power unit in this way, and the bolt 54 , 56, which are fastened and fixed to the bracket-side mounting portions 40, 42. Thereby, such a tubular mount 1
0 is the power unit 5 via the mounting bracket 16.
It is attached to the 8 side. Although not shown, the inner tubular fitting 12 of the tubular mount 10 is mounted by inserting and fixing a mounting rod fixedly mounted on the vehicle body side.

As described above, in the mounting bracket 16 fixed to the intermediate plate 39, its mounting surface 2
The protruding portion 34 provided on the No. 4 is brought into contact with the protruding end surface of the contact protruding portion 46 of the intermediate plate 39. Then, the mounting bracket 16 is fastened to the intermediate plate 39 at the portion where the mounting hole 36 is formed around the protruding portion 34, so that the tubular mount 10 is fixed to the mounting bracket 16. Further, the contact pressure is exerted on the central portion, so that the assembling strain is formed so as to project upward by the height of the protruding portion 34.

Therefore, in the power unit supporting device having such a structure, the protrusion 34 provided on the mounting bracket 16 causes the mounting bracket 16 to be substantially in the power unit at the central portion which is the load input point. It is directly supported on the 58 side, and thereby, the span of the support point of the mounting bracket 16 with respect to the power unit side is shortened.

Therefore, in such a power unit supporting device, the amount of deformation of the mounting bracket 16 can be suppressed, and the rigidity under the assembled condition can be substantially improved. It is not necessary to set the rigidity so high, and the weight and cost of the member can be advantageously reduced.

Further, since the amount of deformation of the mounting bracket 16 is suppressed, the amount of repeated deformation due to the vibration load input between the inner and outer cylindrical metal fittings 12 and 14 is reduced, and its durability can be advantageously improved. is there.

Furthermore, since the rigidity of the mounting bracket 16 under the assembled condition can be substantially improved, it becomes easy to set the natural frequency of the mounting bracket 16 in the high frequency range, whereby the mounting bracket 16 can be mounted. The deterioration of the vibration transfer characteristic due to the resonance phenomenon of the bracket 16 can be effectively reduced.

Incidentally, in the power unit supporting device having the above-mentioned structure, the vibration frequency characteristic when hammering vibration in the direction perpendicular to the axis is applied to the metal sleeve 30 of the mounting bracket 16 is measured at the upper end of the metal sleeve 30. The results obtained are shown in FIG. 9 together with the similar test results performed on the comparative example configured using the mounting bracket 16 having no protrusion 34.

From the measurement results shown in FIG. 9 as well, it is apparent that the resonance frequency in the power unit supporting device can be set advantageously in the high frequency range.

Further, as described above, the mounting bracket 16
If the projecting height of the projecting portion 34 is set to be sufficiently larger than the bending amount of the first mounting plate 20 when the vibration load is input, even when an excessive vibration load is input, It is possible to prevent the first mounting plate 20 from separating from the abutting protrusion 46 of the intermediate plate 39, and to effectively prevent the generation of vibration and noise due to such separation and striking. Become.

The embodiments of the present invention have been described in detail above, but these are literal examples, and the present invention should not be construed as being limited to such specific examples.

For example, in the above-mentioned embodiment, the protrusion 34 is formed on the mounting bracket 16, but it is also possible to form such protrusion on the intermediate plate 39, or alternatively, such protrusion is formed. Mounting bracket 16
It is also possible to form the intermediate plate 39 and the intermediate plate 39 so as to project in opposite directions.

Further, it is set around the protrusion,
The number of fixed portions of the mounting bracket 16 to the intermediate plate 39 is not limited by the above-described embodiment, and the arrangement thereof is not limited.

Furthermore, in the above-described embodiment, the mounting bracket 16 is mounted on the power unit 58 side via the intermediate plate 39, but the power unit 58 can be mounted on the power unit 58 without using the intermediate plate 39. The mounting portion is directly formed, and the mounting bracket 16
It is also possible to attach the to the power unit 58 directly.

Further, in the above embodiment, the cylindrical mount 1 is used.
The inner tubular metal fitting 12 of 0 is attached to the vehicle body side, and the outer tubular metal fitting 14 is attached to the power unit side via the mounting bracket 16, respectively. On the contrary, the inner tubular metal fitting 12 is attached to the power unit side, The present invention is also applicable to a power unit supporting device having a structure in which the outer tubular metal member 14 is mounted on the vehicle body side via the mounting bracket 16.
It can be similarly applied.

In addition, the structure of the cylindrical mount used in the present invention is not limited, and of course, a fluid-filled type can be used.

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a front view showing a cylindrical mount used in a power unit support device according to an embodiment of the present invention.

FIG. 2 is a plan view of the cylindrical mount shown in FIG.

3 is a right side view of the tubular mount shown in FIG. 1. FIG.

FIG. 4 is a bottom view of the cylindrical mount shown in FIG.

FIG. 5 is a front view showing an intermediate plate used in the power unit supporting device as one embodiment of the present invention.

6 is a plan view of the intermediate plate shown in FIG. 5. FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a front view showing a power unit supporting device as one embodiment of the present invention.

9 is a graph showing a measurement result of vibration frequency characteristics in the power unit supporting device shown in FIG. 8 together with a comparative example.

[Explanation of symbols]

 10 tubular mount 12 inner tubular metal fitting 14 outer tubular metal fitting 16 mounting bracket 20 first mounting plate 22 second mounting plate 24 mounting surface 34 protruding portion 39 intermediate plate 40, 42 bracket side mounting portion 46 abutting protrusion 50 power unit Side mounting part 58 Power unit

Front page continued (72) Inventor Masayuki Hibi, 3600 Gyokutsuyama, Azai, Komaiyama, Tokai Rubber Industry Co., Ltd. Rubber Industry Co., Ltd.

Claims (1)

[Claims] 1. A tubular mount comprising an inner tubular metal member and an outer tubular metal member, which are arranged at a predetermined distance in a radial direction from each other, by a rubber elastic body interposed therebetween, A plate-shaped mounting bracket is fixed to the outer cylindrical metal fitting of the mold mount, and the mounting bracket is attached to the mounting portion provided on either one of the power unit side and the vehicle body side, around the fixed portion of the outer cylindrical metal fitting. While abutting and fixing at a plurality of positions of the power unit, the power cylinder unit is attached to the other side of the power unit side and the vehicle body side so that the power unit is vibration-isolatedly supported with respect to the vehicle body. In the support device, a fixing portion of the outer tubular metal fitting in the mounting bracket,
A protrusion protruding in the opposing direction is formed between the power unit side mounting portion and the vehicle body side mounting portion facing the fixed portion of the mounting bracket, and the contact pressure is applied to the mounting bracket by the protruding portion. A power unit supporting device characterized by exerting a mounting strain on such a mounting bracket by exerting it.