JP4775563B2 - Center bearing support - Google Patents

Description

  The present invention relates to a center bearing support that elastically supports a propeller shaft that is suspended from a lower surface of a vehicle body in a vehicle such as an automobile and is horizontally mounted on the lower side of the vehicle body.

  Conventionally, as shown in FIG. 7, an inner ring 54 is connected to an inner peripheral side of an outer ring 52 attached to the vehicle body side of a vehicle via an elastic body 53 made of a rubber-like elastic body. On the side, a center bearing support 51 for attaching a center bearing 55 for rotatably supporting the propeller shaft 56 is known. The elastic body 53 made of a rubber-like elastic material is formed into an annular shape and has a bellows portion 53a having a shape bulging in one axial direction. The bellows portion 53a has a single layer structure made of a single rubber film. Has been.

  As shown in the figure, the center bearing support 51 is assembled to the front side of the joint 57 of the propeller shaft 56 so as to function to support rotation of the propeller shaft 56 and to insulate the propeller shaft 56 from vibration. However, due to the nature of the product, a low-damping rubber material (low dynamics) is used in order to increase the low-frequency spring characteristics (press the vibration of the peller when starting) and to reduce the high-frequency spring characteristics (insulation of high-speed vibration of the peller). Double material) is used. Therefore, there is a problem that energy absorption due to attenuation is small with respect to the input.

  In addition, although the center bearing support which enclosed the hydraulic fluid is indicated by following patent document 1 or 2, these are the combination of the outer bellows part and the inner bellows part of the shape which swelled in the same direction in the axial direction. It does not have a two-layer bellows portion.

Japanese Patent No. 2752581 Japanese Patent Application Laid-Open No. 11-78565

  In view of the above, an object of the present invention is to provide a center bearing support capable of obtaining a large damping effect even when the bellows portion is relatively small in displacement.

In order to achieve the above object, a center bearing support according to claim 1 of the present invention is a center bearing support that elastically supports a propeller shaft in a vehicle drive system, and has a ring-shaped bellows portion. The bellows part is a two-layer structure comprising a combination of an outer bellows part and an inner bellows part swelled in the same axial direction, and a friction damping rubber is sandwiched between the two bellows parts, and the friction damping The rubber is formed by sheet rubber, and when an external force is input to the center bearing support, the outer bellows part, the inner bellows part, and the friction damping rubber are elastically deformed in relation to each other, and at this time, they slide on each other. It is a feature.

A center bearing support according to claim 2 of the present invention is a center bearing support that elastically supports a propeller shaft in a vehicle drive system, wherein the bellows portion has a ring-shaped bellows portion. It is a two-layer structure comprising a combination of an outer bellows portion and an inner bellows portion swelled in the same axial direction, and a plurality of walls are provided on opposite surfaces of the bellows portions so as to mesh with each other, and A hydraulic fluid such as a viscous fluid is filled in between, and the plurality of walls have a portion where the walls extending in the circumferential direction are combined and a portion where the walls extending in the radial direction are combined. The portions are alternately set on the circumference, and each of the walls is formed of a rib-like protrusion .

  In the center bearing support according to claim 1 of the present invention having the above-described configuration, the bellows portion has a two-layer structure composed of a combination of an outer bellows portion and an inner bellows portion having a shape swollen in the same axial direction. Since the friction damping rubber is sandwiched between the bellows parts, if the propeller shaft touches or vibrates to the center bearing support, the outer bellows part, the inner bellows part and the friction damping rubber are mutually connected. They are elastically deformed in relation to each other, and then slide on each other.

  Further, in the center bearing support according to claim 2 of the present invention, the bellows part is a two-layer structure composed of a combination of an outer bellows part and an inner bellows part having a shape swelled in the same direction in the axial direction. Since a hydraulic fluid such as a viscous fluid is filled in between, the outer bellows and the inner bellows are elastically deformed in relation to each other when the propeller shaft touches or vibrates to the center bearing support. At this time, the hydraulic fluid flows between the two bellows portions. In addition, in the invention according to the second aspect, since the plurality of walls are provided on the opposing surfaces of the bellows portions so as to mesh with each other, the flow path of the hydraulic fluid is complicated (uneven). The plurality of walls come into contact with each other when a large amplitude external force is input to the center bearing support.

In addition to this, in the center bearing support according to claim 2 of the present invention, a plurality of walls include a portion where the walls extending in the circumferential direction are combined, and a portion where the walls extending in the radial direction are combined. Since both portions are alternately set on the circumference, the effect of the invention according to claim 2 is exhibited in each of the directions intersecting with these walls.

  The present invention has the following effects.

That is, in the center bearing support according to claim 1 of the present invention, as described above, the bellows portion has a two-layer structure composed of a combination of an outer bellows portion and an inner bellows portion having a shape swelled in the same axial direction. In addition, because the friction damping rubber is sandwiched between both bellows parts, when external force such as the contact of the propeller shaft or vibration is input to the center bearing support, the outer bellows part, the inner bellows part, and the friction damping rubber Elastically deform and slide on each other. Therefore, since attenuation due to sliding resistance or frictional resistance occurs, a large attenuation effect can be obtained. The friction damping rubber is formed of sheet rubber.

  In the center bearing support according to claim 2 of the present invention, as described above, the bellows portion has a two-layer structure composed of a combination of an outer bellows portion and an inner bellows portion having a shape swelled in the same axial direction. At the same time, the outer bellows and inner bellows are elastically deformed when an external force, such as contact with the propeller shaft or vibration, is input to the center bearing support because the fluid such as viscous fluid is filled between the two bellows. The hydraulic fluid flows between the bellows portions. Therefore, since attenuation due to flow resistance occurs, a large attenuation effect can be obtained. In addition, since the plurality of walls are provided on the opposing surfaces of the bellows portions so as to mesh with each other, the flow path of the hydraulic fluid is complicated. Therefore, since a larger flow resistance is generated, a larger damping effect can be obtained. The plurality of walls come into contact with each other when a large amplitude external force is input to the center bearing support. Accordingly, since attenuation due to contact occurs at this time, a larger attenuation effect can be obtained.

In addition to this, in the center bearing support according to claim 2 of the present invention, as described above, a plurality of walls are combined with a portion where the walls extending in the circumferential direction are combined with the walls extending in the radial direction. Since the two parts are alternately set on the circumference, the effect of the invention according to the second aspect is exhibited in each of the directions intersecting with these walls. Therefore, the effect of the invention according to claim 2 can be obtained in each of the directions intersecting the wall. Each wall is made of a rib-like protrusion.

  The present invention includes the following embodiments.

Constitution···
Proposal 1) The center bearing support (CBS) bellows is composed of two layers on the front and rear of the vehicle, with rubber for damping friction interposed between them, and the gap is filled with a lubricant.
Proposal 2) The CBS bellows part has two layers on the front and rear of the vehicle, a plurality of walls arranged so as to mesh with each other are provided, and a lubricant is filled between them. The plurality of walls have a configuration in which walls in two directions, ie, a circumferential direction and an outer circumferential side direction, are set to be equally spaced.

Effect ...
Proposal 1) Since the rubber bellows is deformed when input is applied to the conventional structure, friction damping occurs between the bellows before and after the vehicle and the rubber sandwiched between the two layers, so that a large damping effect can be obtained. . Since a damping effect is obtained by friction of the contact portion, a large damping effect can be obtained even with a small displacement.
Proposal 2) Since the lubricating liquid between the two layers flows due to deformation of the rubber bellows when input is applied to the conventional structure, damping due to flow resistance occurs and a large damping effect can be obtained. By arranging the plurality of walls so as to mesh with each other, the flow path of the lubricating liquid becomes complicated (unevenness), so that the flow resistance becomes larger and a greater damping effect can be obtained. By setting a plurality of walls equally spaced in two directions, ie, in the circumferential direction and the outer peripheral side direction, the above effect can be obtained in any direction up, down, left, or right with respect to the input direction. By disposing the plurality of walls so as to mesh with each other, when the rubber bellows portion is greatly deformed by a large input, contact resistance is generated when adjacent walls come into contact with each other, and a larger damping effect can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
1 and 2 show a center bearing support 1 according to a first embodiment of the present invention. FIG. 1 is a half-sectional view of a center bearing support 1 according to the embodiment, and an enlarged view of a main part thereof is shown in FIG.

  The center bearing support 1 according to this embodiment is a single bellows type center bearing support 1 having an annular bellows portion 2 that elastically supports a propeller shaft in a vehicle drive system. It is configured. Here, the single bellows type means a single bellows type having a shape that bulges in one axial direction regardless of the number of laminated rubber bellows. A bellows portion having a shape bulging toward one side in the axial direction and a bellows portion having a shape bulging toward the other in the axial direction are arranged in parallel in the axial direction. Therefore, the center bearing support 1 according to this embodiment is a single bellows type and not a double bellows type.

  The center bearing support 1 according to this embodiment is a first molded product (first vulcanized molded product, outer component) in which a first elastic body 14 is bonded (vulcanized and bonded) between an outer ring 12 and an inner ring 13. 11 and a second molded product (second vulcanized molded product, inner component) 21 in which a second elastic body 24 is bonded (vulcanized and bonded) between the outer ring 22 and the inner ring 23.

  The first molded article 11 is formed by connecting an inner ring 13 to an inner peripheral side of an outer ring 12 attached to the vehicle body side of a vehicle via a first elastic body 14 made of a rubber-like elastic body. A center bearing 15 that rotatably supports the propeller shaft is attached to the inner peripheral side of the shaft. The outer ring 12 is fixed to the vehicle body via a bracket 16 and the like. The first elastic body 14 is formed in an annular shape, and is integrally formed between an outer peripheral mounting portion 14a bonded to the outer ring 12, an inner peripheral mounting portion 14b bonded to the inner ring 13, and both mounting portions 14a and 14b. The outer bellows portion 14c integrally formed with the molded outer bellows portion 14c, which is elastically deformed during operation, is formed into an arc shape in cross section, and has a shape that bulges toward one axial direction (the vehicle front direction). .

  On the other hand, the second molded product 21 is provided on the inner peripheral side of the outer ring 22 fitted to the inner peripheral surface of the outer peripheral mounting portion 14a in the first molded product 11 via a second elastic body 24 made of a rubber-like elastic body. The inner ring 23 is connected to the outer peripheral surface of the inner peripheral attachment portion 14b of the first molded product 11. The second elastic body 24 is formed in an annular shape, and is integrally formed between the outer peripheral mounting portion 24a bonded to the outer ring 22, the inner peripheral mounting portion 24b bonded to the inner ring 23, and both the mounting portions 24a and 24b. The inner bellows 24c integrally formed with the molded inner bellows 24c and elastically deformed during operation is shaped like a circular arc in cross section like the outer bellows 14c, and is directed toward one axial direction (the vehicle front direction). The shape is swollen.

  The outer bellows part 14c of the first molded product 11 and the inner bellows part 24c of the second molded product 21 are both swelled in the same direction, and thus overlap each other, thereby forming the bellows part 2 having an inner / outer two-layer structure. Yes. Further, the friction damping rubber 3 is sandwiched between the outer bellows portion 14c and the inner bellows portion 24c, and the remaining gap-like sealed space 4 is a working fluid 5 made of a viscous fluid such as silicon oil as a lubricant. Is enclosed. The friction damping rubber 3 is formed into an annular shape by a sheet-like rubber, and the surface thereof is provided with uneven processing 3a for storing a lubricant.

  The center bearing support 1 having the above-described configuration is assembled to the front side of the joint of the propeller shaft in the vehicle and fulfills both functions of rotation support and vibration isolation of the propeller shaft. It has the characteristics.

  That is, in the center bearing support 1 having the above-described configuration, as described above, the bellows portion 2 has a two-layer structure composed of a combination of the outer bellows portion 14c and the inner bellows portion 24c having the same bulging shape. Since the friction damping rubber 3 is sandwiched between 14c and 24c, when an external force such as a touching or vibration of the propeller shaft is input to the center bearing support 1, the outer bellows 14c, the inner bellows 24c, The friction damping rubbers 3 are elastically deformed in relation to each other, and at this time, slide against each other. The direction of sliding is the radial direction or the circumferential direction of the center bearing support 1, and both directions may be combined simultaneously. Therefore, since attenuation due to sliding resistance or frictional resistance occurs during sliding, a large attenuation effect can be generated.

Second embodiment ...
3 to 6 show a center bearing support 1 according to a second embodiment of the present invention. FIG. 3 is a front view of the center bearing support 1 according to this embodiment, and an enlarged cross-sectional view taken along line A-O-A is shown in FIG. FIG. 5 is an enlarged view of a portion B in FIG. 4, and FIG.

  The center bearing support 1 according to this embodiment is a single bellows type center bearing support 1 having an annular bellows portion 2 that elastically supports a propeller shaft in a vehicle drive system. It is configured.

  The center bearing support 1 according to this embodiment is a first molded product (first vulcanized molded product, outer component) in which a first elastic body 14 is bonded (vulcanized and bonded) between an outer ring 12 and an inner ring 13. 11 and a second molded product (second vulcanized molded product, inner component) 21 in which a second elastic body 24 is bonded (vulcanized and bonded) between the outer ring 22 and the inner ring 23.

  The first molded article 11 is formed by connecting an inner ring 13 to an inner peripheral side of an outer ring 12 attached to the vehicle body side of a vehicle via a first elastic body 14 made of a rubber-like elastic body. A center bearing that rotatably supports the propeller shaft is attached to the inner peripheral side of the shaft. The outer ring 12 is fixed to the vehicle body side via a bracket or the like. The first elastic body 14 is formed in an annular shape, and is integrally formed between an outer peripheral mounting portion 14a bonded to the outer ring 12, an inner peripheral mounting portion 14b bonded to the inner ring 13, and both mounting portions 14a and 14b. The outer bellows part 14c, which is integrally formed with the molded outer bellows part 14c, is elastically deformed during operation and is formed into a circular arc shape in a cross-section and swells in one axial direction (front direction of the vehicle). ing.

  On the other hand, the second molded product 21 is provided on the inner peripheral side of the outer ring 22 fitted to the inner peripheral surface of the outer peripheral mounting portion 14a in the first molded product 11 via a second elastic body 24 made of a rubber-like elastic body. The inner ring 23 is connected to the outer peripheral surface of the inner peripheral attachment portion 14b of the first molded product 11. The second elastic body 24 is formed in an annular shape, and is integrally formed between the outer peripheral mounting portion 24a bonded to the outer ring 22, the inner peripheral mounting portion 24b bonded to the inner ring 23, and both the mounting portions 24a and 24b. The inner bellows portion 24c, which is integrally formed with the molded inner bellows portion 24c, is elastically deformed during operation, and is shaped like a circular arc in cross section like the outer bellows portion 14c. It is shaped to bulge out.

  The outer bellows part 14c of the first molded product 11 and the inner bellows part 24c of the second molded product 21 are both swelled in the same direction, and thus overlap each other, thereby forming the bellows part 2 having an inner / outer two-layer structure. Yes. A plurality of walls 14d, 24d, 14e, and 24e are provided on the opposing surfaces of the outer bellows portion 14c and the inner bellows portion 24c so as to mesh with each other, and silicon oil is provided in the sealed space 4 between the bellows portions 14c and 24c. A hydraulic fluid 5 made of a viscous fluid such as is enclosed.

As the plurality of walls 14d, 24d, 14e, and 24e, circumferentially extending portions (regions) E1 in which the walls 14d and 24d extending in the circumferential direction are alternately arranged one by _one and the walls 14e and 24e extending in the radial direction are arranged. Are set alternately in the circumferential direction one by one (region) E ₂ , the two parts E ₁ , E ₂ are alternately arranged on the circumference, and each part E ₁ , E ₂ etc. It is set to a distribution (four in the figure). Each of the walls 14d, 24d, 14e, and 24e is made of a rib-like protrusion.

  The center bearing support 1 having the above-described configuration is assembled to the front side of the joint of the propeller shaft in the vehicle and fulfills both functions of rotation support and vibration isolation of the propeller shaft. It has the characteristics.

  That is, in the center bearing support 1 having the above-described configuration, as described above, the bellows portion 2 has a two-layer structure composed of a combination of the outer bellows portion 14c and the inner bellows portion 24c having the same bulging shape. Since the hydraulic fluid 5 such as a viscous fluid is filled between 14c and 24c, when an external force such as a touching or vibration of the propeller shaft is input to the center bearing support 1, the outer bellows 14c and the inner bellows 24c elastically deforms in relation to each other, and at this time, the working fluid 5 flows between the bellows portions 14c and 24c. Accordingly, since attenuation due to flow resistance occurs, a large attenuation effect can be generated.

  In addition, since the plurality of walls 14d, 24d, 14e, and 24e are provided on the opposing surfaces of the bellows portions 14c and 24c so as to mesh with each other, the flow path of the hydraulic fluid 5 is complicated. When the flow path is complicated, the hydraulic fluid 5 becomes difficult to flow, so that a large flow resistance is generated. Accordingly, since a larger flow resistance is generated, a larger damping effect can be generated.

  As shown in FIG. 6, when a large amplitude external force is input to the plurality of walls 14 d, 24 d, 14 e, 24 e to the center bearing support 1, the adjacent walls 14 d, 24 d, 14 e, 24 e are It is comprised so that it may contact (a contact part is shown with the code | symbol C). Therefore, since attenuation due to contact occurs at this time, a larger attenuation effect can be generated.

Furthermore, a plurality of walls 14d, 24d, 14e, as 24e, the wall 14d extending in the circumferential direction, the portion _{E 1} to 24d to each other are combined, the wall 14e extending in the radial direction, portions 24e each other are combined _{E 2} And the two portions E ₁ and E ₂ are alternately arranged on the circumference, so that the flow resistance or contact resistance is generated in the direction intersecting the walls 14d, 24d, 14e, and 24e, respectively. . Accordingly, a large damping force can be generated in each of the directions intersecting the walls 14d, 24d, 14e, and 24e. In addition, the cross-sectional shape of each wall 14d, 24d, 14e, 24e is not specifically limited.

The half section view of the center bearing support according to the first embodiment of the present invention 1 is an enlarged view of the main part of FIG. Front view of center bearing support according to the second embodiment of the present invention AA-A line enlarged sectional view of FIG. Part B enlarged view of FIG. (A) and (B) are explanatory diagrams of the operation of the center bearing support. Sectional view of center bearing support according to conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center bearing support 2 Bellow part 3 Friction damping rubber 3a Concavity and convexity 4 Sealed space 5 Hydraulic fluid 11 First molded product 12, 22 Outer ring 13, 23 Inner ring 14 First elastic body 14a, 24a Outer peripheral attachment part 14b, 24b the inner peripheral attaching portion 14c outer bellows portion 14d, 14e, 24d, 24e wall 21 and the second molded product 24 second elastic member 24c inside the bellows unit E _{1, E 2} walls combining sites

Claims (2)

A center bearing support (1) for elastically supporting a propeller shaft in a vehicle drive system, wherein the center bearing support (1) has an annular bellows part (2).
The bellows part (2) has a two-layer structure composed of a combination of an outer bellows part (14c) and an inner bellows part (24c) having a shape swelled in the same axial direction.
Friction damping rubber (3) is sandwiched between the bellows (14c) (24c) ,
The friction damping rubber (3) is formed of a sheet rubber,
When an external force is input to the center bearing support (1), the outer bellows part (14c), the inner bellows part (24c) and the friction damping rubber (3) are elastically deformed in relation to each other, and at this time, they slide with each other. center bearing support which is characterized in that. A center bearing support (1) for elastically supporting a propeller shaft in a vehicle drive system, wherein the center bearing support (1) has an annular bellows part (2).
The bellows part (2) has a two-layer structure composed of a combination of an outer bellows part (14c) and an inner bellows part (24c) having a shape swelled in the same axial direction.
A plurality of walls (14d, 24d) (14e, 24e) are provided on opposite surfaces of the bellows (14c) (24c) so as to mesh with each other, and a viscous fluid or the like is provided between the bellows (14c) (24c). filled with hydraulic fluid (5),
The plurality of walls (14d, 24d) (14e, 24e) are a part (E1) in which the walls (14d) (24d) extending in the circumferential direction are combined with each other, and a wall (14e) (24e) extending in the radial direction. A part (E2) where the two are combined,
The two parts (E1) and (E2) are alternately set on the circumference,
The center bearing support , wherein the walls (14d, 24d) (14e, 24e) are each formed of a rib-like protrusion .

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