JPH0742790A - Propeller shaft vibration damping device - Google Patents

Abstract

PURPOSE:To make a rotational variation automatically adjustable irrespective of magnitude pertaining to the unbalanced value of a propeller shaft by making a liquid flow in an annular regulating chamber formed in an annular case at a time when this propeller shaft is rotated. CONSTITUTION:In a vibration damping mechanism 52 installed in a propeller shaft, a liquid A is stored in an annular regulating chamber 56 formed in a peripheral edge part of an annular case 54. In the case where there is no imbalance in the propeller shaft and it is smoothly rotated, the liquid A is uniformly spread around in the regulating chamber 56. In the case where there is an unbalanced part in the propeller shaft, however, the propeller shaft moves as rotating in a direction where the imbalance exists, whereby a vibration is produced there, but the inertial force is in the liquid A so that the liquid A tries to move in the opposite direction to the motion, therefore an inclination of the liquid A is produced in a reverse position to a direction where an imbalance part of the propeller shaft exists. With this constitution, both imbalance parts themselves of the propeller shaft and the vibration damping mechanism 52 are negated with each other, whereby vibration can be damped in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller shaft vibration damping device, and more particularly to an unbalanced propeller shaft.
The present invention relates to a propeller shaft vibration damping device capable of automatically adjusting rotation fluctuations regardless of the amount of the quantity.

[0002]

2. Description of the Related Art In a vehicle, the power of an internal combustion engine is transmitted from a transmission, which is one power transmission, to a differential, which is another power transmission, via a propeller shaft, and left and right wheels mounted on left and right wheel shafts. Some are equipped with a power transmission system for rotating the rear wheels.

Many vibrations are generated on the propeller shaft, such as torsional vibrations due to torque fluctuations, bending vibrations of pipe portions, and rotational vibrations due to rotational imbalance.

[0006] As a countermeasure against this vibration, for example, Jitsuko Sho 5
No. 7-19468 and Japanese Patent Publication No. 49-20644. The one disclosed in Japanese Utility Model Publication No. 57-19468 is a damper that damps torsional vibration.
A strip-shaped plate made of a wear-resistant material is curved, and in the circumferential direction between the outer peripheral surface or the inner peripheral surface of the inertial mass body and the wall surface of the accommodating chamber facing it, in a state where both ends of the strip-shaped plate are not fixedly connected. Is provided as a bearing plate. Also,
Japanese Patent Publication No. 49-20644 discloses a metal tube filled with a liquid or rubber-like elastic substance in order to damp bending vibration.

[0005]

However, conventionally, the adjustment of the rotational imbalance of the propeller shaft can be reduced due to production problems, but the adjustment from the production stage is limited. However, even if it is absorbed by the dynamic damper, the rotational vibration has a wide frequency band,
A dynamic damper that absorbs only a certain frequency has a problem that its effect is small. In addition, in order to make it difficult to transmit vibrations with a rubber mount that elastically supports the power transmission, it is necessary to soften the hardness of the mount, so that the rotation center of the propeller shaft is easily moved, that is, it is easily displaced, This has caused an adverse effect that promotes worsening of the rotational imbalance.

[0006]

In order to eliminate the above-mentioned inconvenience, the present invention firstly relates to a propeller shaft for transmitting the power of an internal combustion engine mounted on a vehicle to a power transmission device. Is provided with a vibration damping mechanism that causes liquid to flow in an annular adjustment chamber formed in the annular case when the propeller shaft rotates in order to damp rotational vibration during rotation.

Secondly, in a propeller shaft for transmitting the power of an internal combustion engine mounted on a vehicle to a power transmission device, an annular adjustment chamber is provided in an annular case, and a plurality of partition walls are radially provided in the annular adjustment chamber. To form a plurality of storage chambers in the circumferential direction,
It is characterized in that the partition wall is provided with a flow hole that communicates between the adjacent storage chambers, and the liquid that flows during the rotation of the propeller shaft is provided in the storage chamber.

Thirdly, in the propeller shaft for transmitting the power of the internal combustion engine mounted on the vehicle to the power transmission, an annular adjustment chamber is provided in the annular case, and the annular adjustment chamber accommodates a plurality of accommodations in the circumferential direction. A plurality of vanes are radially arranged to form a chamber, and the vanes are provided in a vane housing hole formed in the case so as to be retractable via a spring.

Fourthly, in the propeller shaft for transmitting the power of the internal combustion engine mounted on the vehicle to the power transmission, an annular adjustment chamber is provided in the annular case, and vane housing holes are radially formed in the case. The vane body is provided in the vane body accommodating hole so that the vane body can be retracted and retracted, and a locking mechanism is provided for fixing the vane body by moving the vane body into the annular adjustment chamber when the propeller shaft rotates.

Fifth, in a propeller shaft for transmitting the power of an internal combustion engine mounted on a vehicle to a power transmission, an annular adjustment chamber is provided in an annular case, and the annular adjustment chamber is rotated when the propeller shaft rotates. It is characterized in that a thermosetting agent which is flown by centrifugal force and hardens when heated is provided.

[0011]

According to the structure of the present invention, during the rotation of the propeller shaft, vibration is generated by moving while rotating in the direction of the heavy unbalanced portion existing in the propeller shaft, but the liquid is moved by the inertial force. Of the propeller shaft in an opposite direction to the direction in which the propeller shaft is unbalanced, which causes the propeller shaft to become unbalanced. The part and the unbalanced part of the liquid of the vibration damping mechanism are canceled out, suppressing the generation of vibration regardless of the amount of the unbalanced part of the propeller shaft, and automatically prevent the rotational vibration of the propeller shaft. Can be dampened.

[0012]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 5 show a first embodiment of the present invention. In FIG. 5, 2 is a power transmission device for a vehicle, 4 is an internal combustion engine, 6 is a transmission, 8 is a propeller shaft, and 10 is a rear differential. The propeller shaft 8 transmits the power from the transmission 6 which is one power transmission to the differential gear 10 which is another power transmission.

The differential 10 has a left axle 12 on one side and a right axle 14 on the other side. Left axle 12
A left rear wheel (not shown) is provided in the vehicle, and a right rear wheel (not shown) is provided in the right axle 14.

Further, in the differential gear 10, one end side of the left side support member 16 is continuously provided on the left side, and one end side of the right side support member 18 is continuously provided on the right side.

The other end of the left side support member 16 is elastically supported by the left side suspension arm 20 via a left side differential mount 22 made of a soft rubber material. The other end of the right support member 18 is elastically supported by the right suspension arm 24 via a right diff mount 26 made of a soft rubber material. The rear portion of the differential gear 10 is elastically supported by the rear frame 30 via a rear differential mount 24 made of a soft rubber material.

The propeller shaft 8 includes a front propeller shaft 8-1 connected to the transmission 6 and a rear propeller shaft 8-2 connected to the differential 10. The rear end of the front side propeller shaft 8-1 and the front end of the rear side propeller shaft 10-2 have an intermediate joint mechanism 3
Connected by two.

The rear end of the rear propeller shaft 8-2 is connected to a drive shaft (not shown) of the differential gear 10 by a universal joint 34, as shown in FIG. That is, the rear propeller shaft 8
-2, a propeller shaft-side yoke 36 is continuously provided at the rear end of -2, and a yoke portion 42 of a flange yoke 40 is continuously provided at the propeller shaft-side yoke 36 via a cross shaft 38. The flange portion 44 of the flange yoke 40 includes, for example, four sets of connecting bolts 46 and connecting nuts 4 at equal intervals in the circumferential direction.
It is fixed to the drive shaft flange body 50 which is connected to the drive shaft by means of.

Therefore, in the first embodiment, together with the universal joint 34, a vibration damping mechanism 52 is provided to damp the rotational vibration of the propeller shaft 8 during rotation.

As shown in FIG. 2, the vibration damping mechanism 52 of the first embodiment has an annular case 54 and an annular adjusting chamber 5 formed at the peripheral portion of the case 54.
6 and the liquid A contained in the adjusting chamber 56.

The case plate 58 of the case 54 is formed with a central opening 60 at a central portion and four bolt insertion holes 62 formed around the central opening 60 and through which the connecting bolts 46 are inserted. .

The case 54 has an adjusting chamber 56.
In order to form the above, an inner circular member 64 and an outer circular member 66 are provided so as to project in the peripheral direction of the case plate 58 in the axial direction.

On the opening side of the adjusting chamber 56, the inner circular member 6 is provided.
4 and the end surface of the outer circular member 66 are closed by a lid 68.

Therefore, as shown in FIG. 1, the adjustment chamber 56 includes the inner circular member 64, the outer circular member 66, and the case plate 5.
It is formed by hermetically sealing with the chamber forming portion 70 and the lid body 68.

The protruding portion 72 of the lid portion 68 is formed by the adjusting chamber 5
The outer peripheral surface is joined to the inner peripheral surface of the outer circular member 64 via the O-ring 74 by slightly immersing in the inner peripheral surface of the outer peripheral member 6. Also, the lid 6
The lid flange 76 of No. 8 is attached to the case 54 by a plurality of fixing bolts 82 that are inserted into bolt holes 78 formed in the lid flange 76 and screwed into a plurality of screw holes 80 formed in the end surface of the outer circular member 66. To be

In the adjusting chamber 56 thus sealed,
As shown in FIG. 2, a liquid A such as water is contained in a fluid manner.
In FIG. 2, it is shown that the liquid A is evenly present on the inner peripheral surface of the outer circular member 66 with the same width.

Further, in the first embodiment, as shown in FIG. 3, in the annular adjusting chamber 56, one end side is connected to the inner circular member 64 and the other end side is connected to the outer circular member 66. Thus, a plurality of partition walls 84 are radially provided, and a plurality of storage chambers 86 are formed by these partition walls 84. At the end portion of the partition wall 84 on the outer circular member 66 side, a circulation hole 88 for the liquid A is formed in order to communicate the adjacent storage chambers 86 with each other.

Next, the operation of the first embodiment will be described.

The power from the internal combustion engine 4 is transmitted to the rear wheels via the transmission 6, the propeller shaft 8 and the differential 10. The differential 10 includes left, right and rear differential mounts 22,
It is elastically supported on the vehicle body by 26 and 28. Also,
The rotational vibration generated on the propeller shaft 8 is transmitted to the vehicle body from the differential gear 10 and the diff mounts 22, 26, 28. In order to suppress the vibration propagation to the vehicle body, each diff mount 22,
Since 26 and 28 are configured to be soft, the differential gear 10 is easy to move, and is also moved by the rotational vibration of the propeller shaft 10, the center of rotation is moved, and the unbalance of rotation is aggravated. Is also encouraged.

Imbalance on the propeller shaft 10
In the case where the liquid A smoothly rotates without the presence of the liquid, as shown in FIGS. 2 and 3, the liquid A is uniformly spread in each of the storage chambers 86 by the centrifugal force.

However, when an unbalanced portion is generated on the propeller shaft 8, as shown in FIG. 4, the propeller shaft 8 moves while rotating in the direction of the unbalanced portion (heavy portion), thereby causing vibration. Although generated, since the liquid A has its inertial force, the liquid A tries to move in a direction opposite to the movement of the liquid A. Therefore, the liquid A is moved to a position opposite to the direction of the unbalanced portion of the propeller shaft 8. The deviation occurs. As a result, the unbalanced portions of the propeller shaft 8 and the vibration damping mechanism 52 cancel each other out, and the vibration can be damped.

Since the deviation of the liquid A also changes depending on the magnitude of the vibration, the rotational vibration of the propeller shaft 8 is automatically adjusted regardless of the amount of the unbalanced portion of the propeller shaft 8. be able to.

Further, the vibration damping mechanism 52 is attached to the universal joint 34.
Since it is provided between the differential gears 10, it is possible to suppress vibration due to imbalance that occurs secondarily, such as center deviation due to attachment of the propeller shaft 8 and center deviation of the cross shaft 38 of the universal joint 34.

Further, since the vibration due to the rotation of the propeller shaft 8 can be suppressed, the mechanism such as the dynamic damper does not limit the frequency and the like, which is practically advantageous.

6 and 7 show a second embodiment of the present invention.

In the following embodiments, the parts having the same functions as those of the above-mentioned embodiments are designated by the same reference numerals.

The feature of this second embodiment is that a plurality of vane body accommodating holes 102 are radially formed on the inner peripheral surface of the outer circular member 66, as shown in FIG. Providing the base end side of the spring 104 in the deep part,
A ball 106 is provided on the tip side of the spring 104,
The ball 106 is provided with a ball hole 110 of a vane 108 capable of radially projecting and retracting in the adjusting chamber 56,
This vane body 108 is provided by pressing it against the outer peripheral surface side of the inner circular member 64 by the urging force of the spring 104.

According to the structure of the second embodiment, when the propeller shaft 8 rotates, the vane body 108 is retracted into the vane body accommodating hole 102 against the urging force of the spring 104 by the centrifugal force as shown in FIG. Then, the liquid A flows in the adjusting chamber 56, the same effect as that of the first embodiment described above is obtained, and the liquid A can be held between the vane bodies 108 when the propeller shaft 8 is not rotating.

8 and 9 show a third embodiment of the present invention.

The features of the third embodiment are as follows. That is, a plurality of vane body accommodating holes 202 are radially formed on the outer peripheral surface of the inner circular member 64, and vane bodies 204 are provided in the vane body accommodating holes 202 so as to be retractable.
A locking hole 208 of a locking mechanism 206 is formed on one side surface of the vane body 204, and a hole 210 for a ball catcher of the locking mechanism 206 that communicates with a side portion of the vane housing hole 202 is formed in the inner circular member 64. And a locking spring 212 is housed in the ball catcher hole 210, and a locking ball 214 is attached to the tip side of the locking spring 212.
To be fixed.

According to the configuration of the third embodiment, when the propeller shaft 8 is not rotating, the vane body 204 is recessed into the vane body accommodating hole 202 as shown in FIG. 8, but the propeller shaft 8 is rotating. Then, first, the liquid A flows by a certain amount of centrifugal force, and the vane body 204 causes the locking spring 2 to move.
When the movement of the vane body 204 is suppressed by the urging force of the vane 12, and the centrifugal force becomes large, the tip side of the vane body 204 comes into contact with the inner peripheral surface of the outer circular member 66 due to the great centrifugal force, and the adjacent vanes as shown in FIG. A predetermined amount of liquid A is held between the bodies 204.

As a result, the rotational vibration of the propeller shaft 8 can be damped.

10 and 11 show a third embodiment of the present invention.

A feature of the third embodiment is that, as shown in FIG. 10, a thermosetting agent B such as an epoxy resin which is cured when heated is enclosed in the adjusting chamber 56. The thermosetting agent B has a property of flowing like a liquid in a normal state, but hardening when heated.

According to the structure of the third embodiment, when the propeller shaft 8 rotates, the thermosetting agent B which has not been heated flows in correspondence with the unbalanced portion of the propeller shaft 8 as shown in FIG. By heating the thermosetting agent B with heat generated by the differential gear 10 or with heat such as flame heat from a burner or electric heat from the outside, the propeller shaft 8 is heated.
The thermosetting agent B is hardened at a position where the rotational vibration does not occur, and the thermosetting agent B is fixed at a predetermined position in the adjusting chamber 56 so as to adjust the rotational vibration.

As a result, the rotational fluctuation of the propeller shaft 8 can be attenuated at the adjustment stage in the factory.

[0046]

As is apparent from the above detailed description, according to the present invention, liquid is generated in the annular adjusting chamber formed in the annular case when the propeller shaft is rotated so as to damp rotational vibration during rotation of the propeller shaft. By providing a vibration damping mechanism for flowing the liquid, the liquid is biased to a position opposite to the direction in which the unbalanced portion of the propeller shaft exists in the annular adjustment chamber, and the unbalanced portion of the propeller shaft and the liquid of the vibration damping mechanism are displaced. The unbalanced portion of the propeller shaft can be canceled, and the generation of vibration can be suppressed from being promoted regardless of the amount of the unbalanced portion of the propeller shaft, and the rotational vibration of the propeller shaft can be automatically damped.

[Brief description of drawings]

FIG. 1 is a side view of a vibration damping mechanism.

FIG. 2 is a sectional view of a vibration damping mechanism.

FIG. 3 is a sectional view of a vibration damping mechanism provided with a partition wall.

FIG. 4 is a sectional view of a vibration damping mechanism in which a liquid flows.

FIG. 5 is a configuration diagram of a power transmission device.

FIG. 6 is a partial cross-sectional view of the vibration damping mechanism of the second embodiment.

FIG. 7 is a partial cross-sectional view of the vibration damping mechanism in a state where the vane body has moved in the second embodiment.

FIG. 8 is a partial sectional view of a vibration damping mechanism of a third embodiment.

FIG. 9 is a partial cross-sectional view of the vibration damping mechanism in a state where the vane body has moved in the third embodiment.

FIG. 10 is a sectional view of a vibration damping mechanism of a fourth embodiment.

FIG. 11 is a cross-sectional view of a vibration damping mechanism in a state where a thermosetting agent is flowing in a fourth embodiment.

[Explanation of symbols]

 2 power transmission device 8 propeller shaft 34 universal joint 52 vibration damping mechanism 54 case 56 adjusting chamber 84 partition wall 86 accommodating chamber 88 circulation hole

[Procedure amendment]

[Submission date] September 20, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

[Figure 10]

FIG. 11

Claims (5)

[Claims] 1. A propeller shaft for transmitting power of an internal combustion engine mounted on a vehicle to a power transmission device, wherein the propeller shaft is formed in an annular case when the propeller shaft rotates to damp rotational vibration of the propeller shaft during rotation. A propeller shaft vibration damping device comprising a vibration damping mechanism for causing a liquid to flow in an annular adjustment chamber. 2. A propeller shaft for transmitting power of an internal combustion engine mounted on a vehicle to a power transmission device, wherein an annular case is provided with an annular adjustment chamber, and the annular adjustment chamber is provided with a plurality of partition walls in a radial pattern. A propeller characterized in that a plurality of accommodating chambers are formed in the circumferential direction, a flow hole that connects adjacent accommodating chambers to each other is provided in the partition wall, and a liquid that flows during rotation of the propeller shaft is provided in the accommodating chamber. Shaft vibration damping device. 3. A propeller shaft for transmitting the power of an internal combustion engine mounted on a vehicle to a power transmission device, wherein an annular case is provided with an annular adjustment chamber, and the annular adjustment chamber is provided with a plurality of accommodation chambers in the circumferential direction. A propeller shaft vibration damping device, wherein a plurality of vane bodies are radially arranged to be formed, and the vane bodies are provided so as to be retractable through a spring into a vane body accommodating hole formed in the case. 4. A propeller shaft for transmitting power of an internal combustion engine mounted on a vehicle to a power transmission device, wherein an annular adjustment chamber is provided in an annular case, and vane housing holes are radially formed in the case. Propeller shaft vibration damping characterized in that a vane body is provided in the accommodation hole so as to be retractable, and a locking mechanism is provided for moving and fixing the vane body into the annular adjustment chamber when the propeller shaft rotates. mechanism. 5. A propeller shaft for transmitting the power of an internal combustion engine mounted on a vehicle to a power transmission device, wherein an annular adjustment chamber is provided in an annular case, and the annular adjustment chamber is centrifuged when the propeller shaft rotates. A propeller shaft vibration damping device, characterized in that a thermosetting agent that flows by force and that is cured by heating is provided.