JP6875337B2 - Center bearing - Google Patents

Description

The present disclosure relates to a center bearing for supporting a rotary drive shaft by a fixed system such as a vehicle body.

As a center bearing that pivotally supports the propeller shaft, the one described in Patent Document 1 is known. The center bearing described in Patent Document 1 includes a rubber-like elastic body formed in a thick plate shape in the front-rear direction and a bracket for holding the rubber-like elastic body in the chassis.

JP-A-2017-144882 Japanese Unexamined Patent Publication No. 2014-219049 Japanese Unexamined Patent Publication No. 2011-79394

By the way, the bracket is provided with a plurality of claws that sandwich and hold the edge of the rubber-like elastic body from the front and back. In addition, a hard plate is embedded in the edge of the rubber-like elastic body sandwiched between the front and rear claws. As a result, the deformation of the rubber-like elastic body in the vicinity of the nail is suppressed, and the rubber-like elastic body is hard to be separated from the bracket.

However, for example, when the propeller shaft is displaced forward, a force in the tensile direction is generated on the front surface of the rubber-like elastic body, and a force in the compression direction is generated on the rear surface. The force in the tensile direction and the force in the compressive direction increase as the size of the rubber-like elastic body in the front-rear direction increases. Therefore, when the dimensions of the rubber-like elastic body in the front-rear direction are set large according to the size of the vehicle, the strain of the rubber-like elastic body near the plate becomes large, and the rubber-like elastic body near the plate becomes excessive. Stress can be applied. In this case, the plate and the rubber-like elastic body may be peeled off, or the rubber-like elastic body may be broken, and the rubber-like elastic body may be separated from the bracket.

Therefore, the present disclosure was devised in view of such circumstances, and the purpose of the present disclosure is to provide a center bearing capable of enhancing the detachment resistance of the rubber-like elastic body to the bracket while ensuring the durability against the axial displacement of the rubber-like elastic body. To provide.

According to one aspect of the present disclosure
A rubber-like elastic body formed in a plate shape and
A bearing holding portion provided at the center of the rubber-like elastic body and supporting the rotary drive shaft via a bearing, and a bearing holding portion.
A bracket formed in a frame shape surrounding the bearing holding portion and for attaching the rubber-like elastic body to the vehicle body,
Ribbed portions formed on the outer edges of the front and rear surfaces of the rubber-like elastic body, and
The bone part embedded between the front and rear rib parts and
A pair of claws provided on the bracket so as to be separated from each other in the front-rear direction and for sandwiching the rib portion in which the bone portion is embedded from the outside in the front-rear direction.
Provided is a center bearing characterized by having a thin portion formed on the rubber-like elastic body facing the rib portion and having a smaller thickness in the front-rear direction than the rubber-like elastic body at a position where the rib portion is formed. ..

Preferably, the rib portions are formed on the left and right sides of the rubber-like elastic body, and the pair of claws are provided on the left and right sides of the bracket.

Preferably, the rib portion is formed along the upper side of the rubber-like elastic body by being bent from the upper end of the vertical rib portion and the vertical rib portion formed by extending vertically on the outer edge portions on both the left and right sides of the rubber-like elastic body. The upper rib portion extends from the lower end of the vertical rib portion, and the lower rib portion extends along the lower side of the rubber-like elastic body.

Preferably, the thin-walled portion is formed between the left and right upper rib portions and between the lower rib portions.

Preferably, the upper rib portion and the tip portion of the lower rib portion are formed with an inclined portion in which the height of the protrusion with respect to the thin-walled portion decreases toward the tip.

Preferably, the anterior-posterior dimension of the thin wall portion is set smaller than the anterior-posterior dimension of the bone portion.

Preferably, the rubber-like elastic body radially outward from the bearing holding portion is formed with a slit that absorbs the radial displacement of the bearing holding portion extending in the circumferential direction of the rotary drive shaft. A stopper for restricting the radial movement of the bearing holding portion is formed so as to project from one of the inner peripheral side and the outer peripheral side of the slit to the other.

According to the above aspect, it is possible to enhance the detachment resistance of the rubber-like elastic body to the bracket while ensuring the durability against the axial displacement of the rubber-like elastic body.

It is a schematic side view which shows the use state of the center bearing which concerns on one Embodiment of this disclosure. It is a front view of the rubber-like elastic body held by the bracket. FIG. 2 is a cross-sectional view taken along the line AA of FIG. It is a front view of a rubber-like elastic body. FIG. 4 is a view taken along the line BB of FIG. FIG. 4 is a cross-sectional view taken along the line CC of FIG. It is a front view of a bracket. It is a side view of a bracket. FIG. 7 is a cross-sectional view taken along the line DD of FIG. It is a plane explanatory view explaining the deformation of a rubber-like elastic body when a propeller shaft is displaced forward. It is a front view of the center bearing which concerns on other embodiment. It is a front view of the center bearing which concerns on other embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In addition, each direction of front, rear, left, right, up and down in the embodiment described later refers to each direction of the vehicle. Specifically, the power transmission system shown in FIG. 1 includes a propeller shaft 1 that transmits power from a transmission T / M disposed in front of the vehicle to a differential gear DIFF disposed in the rear of the vehicle. The left side in the figure is the front in the vehicle, and the upper part in the figure is the upper part in the vehicle.

First, a propeller shaft 1 which is a rotary drive shaft supported by the center bearing 2 will be described. The rotary drive shaft is not limited to the propeller shaft 1. The rotary drive shaft may be another shaft that receives an axial force from its output side. In this case, the rotary drive shaft may be something other than a vehicle.

As shown in FIGS. 1 and 5, the center bearing 2 is attached to the propeller shaft 1 which is a rotary drive shaft.

The propeller shaft 1 includes a first universal joint 3 connected to the output shaft (not shown) of the transmission T / M, a sliding constant velocity joint 4 connected to the output side of the first universal joint 3, and sliding. The second universal joint 6 connected to the output shaft 5 of the dynamic constant velocity joint 4, the main shaft portion 7 connected to the output side of the second universal joint 6, the main shaft portion 7 and the differential gear DIFF are connected. A third universal joint 8 is provided.

The sliding constant velocity joint 4 is formed so as to be bendable and expandable and contractible in the axial direction. The output shaft 5 of the sliding constant velocity joint 4 is pivotally supported by the center bearing 2 via a radial bearing 9 which is a bearing. The output shaft 5 of the sliding constant velocity joint 4 includes a small diameter portion 5a fitted into the inner race 10 of the radial bearing 9 and a large diameter portion 5b formed in front of the small diameter portion 5a. The step portion 5c formed between the large diameter portion 5b and the small diameter portion 5a abuts on the front end surface 10a of the inner race 10. A nut 11 is fastened to the rear end of the small diameter portion 5a. As a result, the inner race 10 of the radial bearing 9 is sandwiched and fixed between the step portion 5c and the second universal joint 6. The bearing is not limited to the radial bearing 9. For example, the bearing may be composed of angular contact ball bearings.

The second universal joint 6 is connected to the input shaft 6a, which is fastened to the small diameter portion 5a with a nut 11, the first yoke 6b provided on the input shaft 6a, which is bifurcated and extends rearward, and the first yoke 6b in a cross shape. A second yoke 6d that is flexibly connected via a shaft (spider) 6c and an output shaft 6e provided on the second yoke 6d are provided. The input shaft 6a is formed in a tubular shape into which the small diameter portion 5a is inserted.

The propeller shaft 1 is not limited to this. For example, the propeller shaft 1 may not include the second universal joint 6.

As shown in FIGS. 2 and 3, the center bearing 2 includes a rubber-like elastic body 12 formed in a plate shape having a substantially square front view, and a bearing holding portion 13 provided at the center of the rubber-like elastic body 12. , The bracket 14 formed in a frame shape surrounding the bearing holding portion 13, the rib portions 15 formed on the outer edges of the front and rear surfaces of the rubber-like elastic body 12, and the rib portions 15 in the front and rear were embedded. It includes a bone portion 16, a claw 17 formed on the bracket 14 for sandwiching the rib portion 15 from the outside in the front-rear direction, and a thin-walled portion 18 formed on the rubber-like elastic body 12 facing the rib portion 15.

As shown in FIGS. 4, 5 and 6, the rubber-like elastic body 12 is made of a soft resin such as rubber. Further, a recess 19 and an inclined surface 20 are formed on the upper side 12a and the lower side 12b of the rubber-like elastic body 12. The recess 19 is formed at the center in the left-right direction. The inclined surface 20 is formed on the upper side 12a and the lower side 12b in the left-right direction from the recess 19. The inclined surface 20 is inclined so that the central portion of the upper side 12a is lower than both ends in the left-right direction. Further, the inclined surface 20 is inclined so that the central portion is higher than both end portions in the left-right direction on the lower side 12b.

Further, the rubber-like elastic body 12 is formed with a slit 21 for absorbing the radial displacement of the bearing holding portion 13. A plurality of slits 21 are formed in the rubber-like elastic body 12 radially outward from the bearing holding portion 13 so as to surround the bearing holding portion 13. In the present embodiment, four slits 21 are formed on the same circumference at equal intervals. More specifically, the slits 21 are formed at the four corners of the rubber-like elastic body 12. Further, the slit 21 is formed in an arc shape along the outer circumference of the bearing holding portion 13. Further, both ends of the slit 21 are formed in a curved surface shape. As a result, when the slit 21 is deformed, the stress generated in the rubber-like elastic body 12 can be dispersed, and cracks or the like generated in the rubber-like elastic body 12 from both ends of the slit 21 can be prevented or suppressed. it can.

Further, the rubber-like elastic body 12 is formed with a stopper 22 that regulates the radial displacement of the bearing holding portion 13. The stopper 22 is formed so as to project from the outer peripheral side to the inner peripheral side of the slit 21. The stopper 22 may be formed so as to project from the inner peripheral side to the outer peripheral side of the slit 21.

Further, the rubber-like elastic body 12 is formed in a substantially square shape in front view, but the present invention is not limited to this. For example, the rubber-like elastic body 12 may have a rectangular shape other than a square shape. Further, the rubber-like elastic body 12 may have a shape in which a rectangle and a semicircle are combined. In this case, the lower side 12b or the upper side 12a may be formed in an arc shape.

The bearing holding portion 13 has a through-hole portion 23 formed by penetrating the thin-walled portion 18 of the rubber-like elastic body 12 in the front-rear direction, and the thin-walled portion 18 is provided coaxially with the through-hole portion 23 and extends forward. A cylinder portion 24, a rear cylinder portion 25 provided coaxially with the through hole portion 23 in the thin-walled portion 18, and extending rearward, and a reinforcing member 26 embedded in the thin-walled portion 18, the front cylinder portion 24, and the rear cylinder portion 25. To be equipped.

The through hole portion 23 is between the small diameter portion 23a formed at the front end portion of the thin wall portion 18, the large diameter portion 23b formed in the thin wall portion 18 behind the small diameter portion 23a, and the small diameter portion 23a and the large diameter portion 23b. It is provided with a step portion 23c formed in. The small diameter portion 23a is formed to have a smaller diameter than the large diameter portion 23b. Further, the small diameter portion 23a and the large diameter portion 23b are formed coaxially. The outer race 33 of the radial bearing 9 is press-fitted and fitted into the large diameter portion 23b. As a result, the inner peripheral surface of the large diameter portion 23b is crimped to the outer peripheral surface of the outer race 33. The step portion 23c is in contact with the front end surface 33a of the outer race 33, and restricts the forward movement of the radial bearing 9.

The inner diameter of the front cylinder portion 24 is set to be the same as the inner diameter of the small diameter portion 23a. Further, the inner diameter of the rear cylinder portion 25 is set to be the same as the inner diameter of the large diameter portion 23b.

The rib portion 15 is formed on the outer edge portions of the front surface and the rear surface of the rubber-like elastic body 12. The front rib portion 27 formed on the front surface of the rubber-like elastic body 12 is projected forward. The rear rib portion 28 formed on the rear surface of the rubber-like elastic body 12 is projected rearward.

The front rib portions 27 are formed in a substantially U shape, and are symmetrically formed in pairs on the front surface of the rubber-like elastic body 12. Specifically, the front rib portion 27 has a front vertical rib portion 27a formed along the left side or the right side of the rubber-like elastic body 12 and an upper side of the rubber-like elastic body 12 bent from the upper end of the front vertical rib portion 27a. The front upper rib portion 27b formed along the 12a and the front lower rib portion 27c bent from the lower end of the front vertical rib portion 27a and formed along the lower side 12b of the rubber-like elastic body 12 are provided. A thin-walled portion 18, which will be described later, is formed between the left and right front rib portions 27. Specifically, a thin portion 18 is formed between the front upper rib portions 27b of the left and right front rib portions 27. Further, a thin portion 18 is formed between the front lower rib portions 27c of the left and right front rib portions 27. Further, at the tip portions of the front upper rib portion 27b and the front lower rib portion 27c, an inclined portion 27d is formed in which the height of the protrusion with respect to the thin wall portion 18 decreases toward the tip.

The rear rib portion 28 has a rear vertical rib portion 28a formed symmetrically with respect to the front vertical rib portion 27a, a rear upper rib portion 28b formed symmetrically with respect to the front upper rib portion 27b, and a front lower rib portion 28. It is provided with a rear lower rib portion 28c formed symmetrically with respect to the rib portion 27c. Further, at the tip portions of the rear upper rib portion 28b and the rear lower rib portion 28c, an inclined portion 28d is formed in which the height of the protrusion with respect to the thin wall portion 18 decreases toward the tip.

The bone portion 16 is formed in a plate shape with a hard material such as metal. Specifically, the bone portion 16 is formed in the shape of a rectangular flat plate. The bone portion 16 is embedded in the anterior longitudinal rib portion 27a, the posterior longitudinal rib portion 28a, and the outer edge portion of the rubber-like elastic body 12 on which these are formed. The bone portion 16 is arranged so that the long side extends in the vertical direction and the short side extends in the anterior-posterior direction. The length of the short side of the bone portion 16 is set to be substantially the same as the length from the front end of the anterior longitudinal rib portion 27a to the rear end of the posterior longitudinal rib portion 28a. That is, the bone portion 16 extends from the vicinity of the front end of the anterior longitudinal rib portion 27a to the vicinity of the rear end of the posterior longitudinal rib portion 28a. The bone portion 16 is not limited to metal. The bone portion 16 may be made of another material having a strength equal to or higher than that of metal.

The thin-walled portion 18 is formed in a portion of the rubber-like elastic body 12 excluding the rib portion 15 and the bearing holding portion 13. The dimension t in the anteroposterior direction of the thin wall portion 18 is set to be smaller than the dimension T1 in the anteroposterior direction of the rubber-like elastic body 12 at the position where the rib portion 15 is formed, and smaller than the dimension T2 in the anteroposterior direction of the bone portion 16. .. Further, the dimension t in the front-rear direction of the thin-walled portion 18 is determined according to the spring constant required for the rubber-like elastic body 12. The thin-walled portion 18 may be formed so as to separate the left and right front rib portions 27 and the left and right rear rib portions 28, and the arrangement and shape are not limited to those described above. For example, the rubber-like elastic body 12 facing the slit 21 may be formed with a thick portion (not shown) protruding in the front-rear direction.

As shown in FIGS. 7, 8 and 9, the bracket 14 is formed by pressing a metal plate. The bracket 14 is formed in a substantially U shape in front view. The bracket 14 has a lower frame portion 29 formed to extend in the left-right direction, a pair of left and right side frame portions 30 formed to extend upward from both ends of the lower frame portion 29, and left and right from the upper ends of these side frame portions 30. A mounting flange portion 31 formed so as to extend outward in the direction is provided.

The lower frame portion 29 is formed in a U-shaped cross section. The lower frame portion 29 includes a lower frame main body portion 29a arranged horizontally, and a lower frame flange portion 29b that is bent downward from the front end and the rear end of the lower frame main body portion 29a and extends downward.

The side frame portion 30 is formed in a U-shaped cross section. The side frame portion 30 is a side frame main body 30a arranged so that both sides face in the left-right direction, and a side frame that is bent outward from the front end and the rear end of the side frame main body 30a and extends outward. A flange portion 30b is provided. Two rectangular openings 32 are formed in the side frame main body 30a so as to be vertically separated from each other. A claw 17, which will be described later, is provided on the side frame main body 30a facing the opening 32.

The mounting flange portion 31 is arranged horizontally. A side frame flange portion 30b is connected to the front end and the rear end of the mounting flange portion 31. A bolt insertion hole 31a through which a bolt (not shown) is inserted is formed in the mounting flange portion 31. The mounting flange portion 31 is fastened to a vehicle body (not shown) such as a chassis frame with bolts.

The claw 17 is provided on the side frame portion 30 as a set of a front claw 17a that comes into contact with the front rib portion 27 from the front and a rear claw 17b that comes into contact with the rear rib portion 28 from the rear. Specifically, two sets of claws 17 are provided on each side frame portion 30 at intervals of upper and lower parts. The front claw 17a and the rear claw 17b are provided so as to extend from the front edge and the rear edge of the opening 32 of the side frame main body 30a to the inside of the bracket 14. Specifically, the front claw 17a and the rear claw 17b are formed by bending a part of the side frame main body portion 30a inside the bracket 14.

As shown in FIG. 3, the distance s in the front-rear direction between the front claw 17a and the rear claw 17b sandwiches the front rib portion 27 and the rear rib portion 28 from the front and rear when the rubber-like elastic body 12 is housed in the bracket 14. Is set. As shown in FIGS. 2 and 3, when the rubber-like elastic body 12 is housed in the bracket 14, the front claws 17a and the rear claws 17b located in the upper stage have the front rib portion 27 in which the bone portion 16 is embedded. And the upper end portion of the rear rib portion 28 is sandwiched from the outside in the front-rear direction. The front claw 17a and the rear claw 17b located at the lower stage sandwich the lower end portions of the front rib portion 27 and the rear rib portion 28 in which the bone portion 16 is embedded from the outside in the front-rear direction. At this time, the left and right side frame portions 30 sandwich the rubber-like elastic body 12 from the outside in the left-right direction and are crimped to the rubber-like elastic body 12. Then, the lower frame portion 29 is brought into contact with the lower side 12b of the rubber-like elastic body 12. Further, when the mounting flange portion 31 is fastened to the vehicle body, the rubber-like elastic body 12 is sandwiched between the lower frame portion 29 and the vehicle body and is crimped to the lower frame portion 29 and the vehicle body.

Next, the operation of this embodiment will be described.

The center bearing 2 before being attached to the vehicle body is in a state of being attached to the propeller shaft 1 in advance via the radial bearing 9. Specifically, the propeller shaft 1 is provided with a radial bearing 9 in advance, and the radial bearing 9 is previously fitted to the bearing holding portion 13. Further, the propeller shaft 1 is aligned with the radial bearing 9 and the center bearing 2 attached.

When the center bearing 2 is attached to the vehicle body, the bracket 14 is attached to the rubber-like elastic body 12, and the mounting flange portion 31 of the bracket 14 is fastened to the vehicle body with bolts or the like (not shown). By attaching the bracket 14 to the rubber-like elastic body 12, the left side and the right side of the rubber-like elastic body 12 are crimped to the left and right side frame flange portions 30b. Then, the front rib portion 27 is crimped to the front claw 17a, and the rear rib portion 28 is crimped to the rear claw 17b. Further, by fastening the mounting flange portion 31 of the bracket 14 to the vehicle body, the rubber-like elastic body 12 is sandwiched between the vehicle body and the lower frame portion 29 and is crimped to the vehicle body and the lower frame portion 29.

When the rotational driving force from the transmission T / M is transmitted to the propeller shaft 1, the propeller shaft 1 is rotated while being pivotally supported by the radial bearing 9. At this time, a force in the rotational direction acts on the rubber-like elastic body 12. However, the rubber-like elastic body 12 is formed in a rectangular shape, and each side of the upper, lower, left, and right sides is crimped to the bracket 14 or the vehicle body. Therefore, the rubber-like elastic body 12 does not rotate together with the propeller shaft 1.

Further, when the vehicle travels and its wheels move up and down, the differential gear DIFF also moves up and down. This vertical movement moves the propeller shaft 1 up and down and reciprocates in the front-rear direction. As a result, the bearing holding portion 13 follows the propeller shaft 1 and is displaced in the front-rear direction while being displaced in the vertical direction. At this time, the vertical displacement of the bearing holding portion 13 is absorbed by the slit 21 formed in the rubber-like elastic body 12 being crushed in the radial direction of the propeller shaft 1. When the force acting on the slit 21 is excessive, the stopper 22 comes into contact with the inner surface of the slit 21 on the inner peripheral side. As a result, excessive deformation of the slit 21 and the rubber-like elastic body 12 is suppressed, and the rubber-like elastic body 12 is prevented or suppressed from being detached from the bracket 14.

Further, as shown in FIG. 10, the displacement of the bearing holding portion 13 in the front-rear direction is absorbed by bending the thin-walled portion 18. At this time, the thin-walled portion 18 is set to have a smaller dimension in the anteroposterior direction than the bone portion 16. Therefore, for example, when the thin-walled portion 18 is deformed so that the central portion in the left-right direction of the thin-walled portion 18 projects forward, the tensile force generated on the front surface of the thin-walled portion 18 and the compressive force generated on the rear surface of the thin-walled portion 18 are generated. And can be kept relatively small. Further, it is possible to suppress the tensile force and the compressive force from being transmitted to the rubber-like elastic body 12 near both the front and rear ends of the bone portion 16. As a result, the rubber-like elastic body 12 in the vicinity of both front and rear ends of the bone portion 16 is suppressed from being significantly distorted, and the bone portion 16 and the rubber-like elastic body 12 are prevented from peeling off or the rubber-like elastic material is prevented from breaking. It is suppressed. Then, the rubber-like elastic body 12 is prevented or suppressed from being detached from the bracket 14.

As described above, the center bearing 2 includes a thin-walled portion 18 formed on the rubber-like elastic body 12 facing the rib portion 15. Therefore, when the rubber-like elastic body 12 receives a force in the front-rear direction from the propeller shaft 1, it is possible to prevent or suppress the bone portion 16 and the rubber-like elastic body 12 from peeling off or the rubber-like elastic body 12 from breaking. , It is possible to prevent or suppress the rubber-like elastic body 12 from coming off from the bracket 14. That is, the center bearing 2 according to the present embodiment can enhance the detachment resistance of the rubber-like elastic body 12 with respect to the bracket 14 while ensuring the durability against the axial displacement of the rubber-like elastic body 12.

Further, the rib portion 15 includes vertical rib portions 27a and 28a, upper rib portions 27b and 28b, and lower rib portions 27c and 28c. The upper rib portions 27b and 28b and the lower rib portions 27c and 28c act to maintain the shapes of the left and right side portions of the rubber-like elastic body 12. Therefore, the rubber-like elastic body 12 is more effectively prevented or suppressed from being separated from the front claw 17a and the rear claw 17b.

A thin portion 18 is formed between the left and right upper rib portions 27b and 28b and between the lower rib portions 27c and 28c. Therefore, the center of the rubber-like elastic body 12 in the left-right direction can be easily bent from both side portions, and the followability of the rubber-like elastic body 12 with respect to the center bearing 2 can be improved.

Inclined portions 27d and 28d are formed at the tip portions of the upper rib portions 27b and 28b and the lower rib portions 27c and 28c so that the height of the protrusion with respect to the thin wall portion 18 decreases toward the tip. Therefore, the bendability of the rubber-like elastic body 12 can be gradually increased from both side portions in the left-right direction toward the center, and the followability of the rubber-like elastic body 12 with respect to the center bearing 2 can be further improved.

The dimension t in the anteroposterior direction of the thin wall portion 18 is set smaller than the dimension T2 in the anteroposterior direction of the bone portion 16. Therefore, it is possible to suppress the force generated in the thin-walled portion 18 from being transmitted to the rubber-like elastic body 12 facing the bone portion 16, and it is possible to prevent or suppress the separation of the bone portion 16 and the rubber-like elastic body 12.

A slit 21 is formed in the rubber-like elastic body 12, and a stopper 22 is formed. Therefore, the followability of the rubber-like elastic body 12 in the radial direction with respect to the center bearing 2 can be enhanced, and excessive deformation of the rubber-like elastic body 12 in the radial direction can be prevented or suppressed.

Although the embodiments of the present disclosure have been described in detail above, the present disclosure may also include the following other embodiments.

(1) As shown in FIG. 11, the bracket 40 may be formed in two upper and lower parts. In this case, the bracket 40 may include a pair of half-split brackets 41 formed in a U-shape when viewed from the front, and a bolt 42 for fastening the half-split brackets 41.

(2) The bone portion 16 is embedded on both the left and right sides of the rubber-like elastic body 12, but is not limited to this. For example, as shown in FIG. 11, the bone portion 16 may be embedded in the upper and lower edges of the rubber-like elastic body 12. In this case, the rib portion 15 may be formed on the upper and lower edges of the rubber-like elastic body 12. Further, the claw 17 may be arranged so as to abut the rib portion 15 in which the bone portion 16 is embedded.

(3) The bone portion 16 is formed in the shape of a rectangular flat plate, but the present invention is not limited to this. For example, as shown in FIG. 12, the bone portion 44 may be bent in an L shape in the plate thickness direction thereof. In this case, the bone portion 44 may be embedded in the corner of the rubber-like elastic body 12. Further, the rib portion 45 may be formed at the corners of both the front and rear surfaces of the rubber-like elastic body 12. Further, the claw 17 may be arranged so as to sandwich the rib portion 45 in which the bone portion 44 is embedded from the outside in the front-rear direction.

The configurations of each of the above embodiments can be combined partially or wholly, unless otherwise inconsistent. The embodiments of the present disclosure are not limited to the above-described embodiments, and all modifications, applications, and equivalents included in the ideas of the present disclosure defined by the scope of claims are included in the present disclosure. Therefore, the present disclosure should not be construed in a limited manner and may be applied to any other technique belonging within the scope of the ideas of the present disclosure.

1 Propeller shaft 2 Center bearing 3 1st universal joint 4 Sliding constant velocity joint 5 Output shaft 5a Small diameter part 5b Large diameter part 5c Step part 6 2nd universal joint 6a Input shaft 6b 1st yoke 6c Cross connecting shaft (spider) )
6d 2nd yoke 6e Output shaft 7 Main shaft 8 3rd universal joint 9 Radial bearing 10 Inner race 10a Front end surface 11 Nut 12 Rubber elastic body 12a Upper side 12b Lower side 13 Bearing holding part 14 Bracket 15 Rib part 16 Bone part 17 Claw 17a Front claw 17b Rear claw 18 Thin wall part 19 Recession 20 Inclined surface 21 Slit 22 Stopper 23 Through hole part 23a Small diameter part 23b Large diameter part 23c Step part 24 Front cylinder part 25 Rear cylinder part 26 Reinforcing member 27 Front rib part 27a Front vertical Rib part (vertical rib part)
27b Front upper rib part (upper rib part)
27c Front lower rib part (lower rib part)
27d Inclined portion 28 Rear rib portion 28a Rear vertical rib portion (vertical rib portion)
28b Rear upper rib part (upper rib part)
28c Rear lower rib part (lower rib part)
28d Inclined portion 29 Lower frame portion 29a Lower frame main body 29b Lower frame flange 30 Side frame 30a Side frame main body 30b Side frame flange 31 Mounting flange 31a Bolt insertion hole 32 Opening 33 Outer race 33a Front end surface 40 Bracket 41 Half bracket 42 Bolt 44 Bone 45 Rib

Claims (7)

A rubber-like elastic body formed in a plate shape and
A bearing holding portion provided at the center of the rubber-like elastic body and supporting the rotary drive shaft via a bearing, and a bearing holding portion.
A bracket formed in a frame shape surrounding the bearing holding portion and for attaching the rubber-like elastic body to the vehicle body,
Ribbed portions formed on the outer edges of the front and rear surfaces of the rubber-like elastic body, and
The bone part embedded between the front and rear rib parts and
A pair of claws provided on the bracket so as to be separated from each other in the front-rear direction and for sandwiching the rib portion in which the bone portion is embedded from the outside in the front-rear direction.
A center bearing characterized by having a thin portion formed on the rubber-like elastic body facing the rib portion and having a smaller dimension in the front-rear direction than the rubber-like elastic body at a position where the rib portion is formed. The rib portions are formed on both the left and right sides of the rubber-like elastic body.
The center bearing according to claim 1, wherein the pair of claws is provided on each of the left and right sides of the bracket. The rib portion has a vertical rib portion formed by extending vertically on the outer edges on both left and right sides of the rubber-like elastic body, and an upper portion bent from the upper end of the vertical rib portion and extending along the upper side of the rubber-like elastic body. The center bearing according to claim 2, further comprising a rib portion and a lower rib portion that is bent from the lower end of the vertical rib portion and extends along the lower side of the rubber-like elastic body. The center bearing according to claim 3, wherein a thin-walled portion is formed between the left and right upper rib portions and between the lower rib portions. The center bearing according to claim 4, wherein the upper rib portion and the tip portion of the lower rib portion are formed with an inclined portion in which the height of the protrusion with respect to the thin-walled portion decreases toward the tip. The center bearing according to any one of claims 1 to 5, wherein the dimension of the thin wall portion in the anteroposterior direction is set to be smaller than the dimension of the bone portion in the anteroposterior direction. In the rubber-like elastic body radially outward from the bearing holding portion, a slit for absorbing the radial displacement of the bearing holding portion is formed so as to extend in the circumferential direction of the rotary drive shaft, and the bearing holding portion is held. The center bearing according to any one of claims 1 to 6, wherein a stopper for restricting the radial movement of the portion is formed by projecting from one of the inner peripheral side and the outer peripheral side of the slit to the other.

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