JPH09164854A - Propeller shaft dynamic damper structure - Google Patents

Abstract

(57) [PROBLEMS] To provide a dynamic damper structure of a propeller shaft capable of maintaining a required slip torque and always reliably pressing and supporting the dynamic damper. SOLUTION: In a dynamic damper structure mounted inside a cylindrical propeller shaft for transmitting a driving force on the internal combustion engine side to a drive wheel side, a cylindrical outer ring member 11 having an outer diameter slightly smaller than the inner diameter of the propeller shaft. , The inner weight 12 located inside the
A support elastic member 16 is attached to the outer peripheral surface of the outer ring member 11 to support the outer ring member 11 by being pressed between the outer peripheral member 11 and the inner peripheral surface of the propeller shaft. A dynamic damper structure of a propeller shaft in which 16 is provided with non-clamping portions 16a and 16b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a dynamic damper arranged inside a propeller shaft used in a vehicle such as an automobile.

[0002]

2. Description of the Related Art The output of an internal combustion engine mounted on the front of an automobile is generally transmitted to a rear drive wheel by a propeller shaft via a transmission, and the characteristics of the propeller shaft have a great influence on vehicle vibration. For this reason, various examples have been proposed in which a dynamic damper is mounted inside the cylinder of the propeller shaft to improve the vibration characteristics.

The example disclosed in Japanese Patent Laid-Open No. 3-288041 is an example thereof, and a dynamic damper 02 is fitted in a propeller shaft 01 as shown in FIG. The dynamic damper 02 supports a cylindrical weight 05 inside a cylindrical outer cylinder 03 via an elastic body 04, and a rubber layer 06 is attached to the outer peripheral surface of the outer cylinder 03.

The rubber layer 06 is provided on the outer peripheral surface of the outer cylinder 03 with the same width as the outer peripheral surface. When such a dynamic damper 02 is press-fitted into the propeller shaft 01, the outer peripheral surface of the outer cylinder 03 and the propeller shaft 01. The entire rubber layer 06 is pinched between the inner peripheral surface of the outer cylinder 03 and the inner peripheral surface thereof, and a large slip torque is generated by the elastic force thereof, and the outer cylinder 03 is pressed and supported substantially integrally with the propeller shaft 01.

[0005]

[Problems to be Solved by the Invention] As described above, the rubber layer 06
The whole is clamped to press and support the outer cylinder 03, but after the dynamic damper 02 is press-fitted into the propeller shaft 01 in this way, a base portion such as a cross joint is frictionally pressure-welded to the end portion of the propeller shaft 01, When the friction heat is generated, the propeller shaft 01 is heated and the rubber layer 06 is subjected to a heat load.
The rubber layer 06 will be subjected to a heat load in a state where the whole is compressed, permanent distortion will occur in the whole due to heat deterioration, and the slip torque sufficient to press and support the outer cylinder 03 integrally with the propeller shaft should be maintained. Will be difficult.

The present invention has been made in view of the above points, and an object thereof is to provide a dynamic damper structure of a propeller shaft capable of maintaining a sufficient slip torque and always reliably pressing and supporting the dynamic damper. It is in.

[0007]

In order to achieve the above object, the present invention provides a dynamic damper structure mounted inside a cylindrical propeller shaft for transmitting a driving force from an internal combustion engine to driving wheels. The propeller shaft has a structure in which a vibration damping elastic member connects a cylindrical outer ring member having an outer diameter slightly smaller than the inner diameter of the propeller shaft, and an inner weight located inside thereof. A dynamic damper structure of a propeller shaft is provided in which a support elastic member that is pressed against the inner peripheral surface of the outer ring member is attached, and a non-clamping portion is provided on the support elastic member.

When the dynamic damper is press-fitted into the propeller shaft, the outer ring member is substantially integrally pressed and supported by the inner peripheral surface of the propeller shaft due to the elastic deformation of the entire support elastic member, and the pressing portion of the support elastic member is heated. Even if a permanent strain is generated by receiving a load, the non-pressurized portion of the supporting elastic member does not undergo permanent strain, and the elastic force of the non-pressurized portion maintains the required slip torque to ensure a dynamic damper at all times. Can be pressed and supported.

The support elastic member is bulged so that its axial end portion wraps around the end edge of the cylindrical outer ring member, and the bulged portion is the non-clamping portion. By adopting the dynamic damper structure of the propeller shaft, the elastic force of the bulging portion that does not cause permanent distortion fixes the end edge of the outer ring member, and the dynamic damper can always be reliably pressed and supported.

A plurality of holes are formed in the cylindrical outer ring member, and the supporting elastic member is attached to the outer peripheral surface of the outer ring member by closing the holes and corresponding to the holes of the supporting elastic member. The dynamic damper structure of the propeller shaft according to claim 1 or 2, wherein the closed portion is the non-clamping portion, so that the elastic force of the closed portion that does not cause permanent distortion fixes the outer ring member and the dynamic damper is always provided. Can be reliably pressed and supported.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to FIGS. FIG. 1 shows a part of a power transmission mechanism of a vehicle, which is partially omitted to show a state in which a first propeller shaft 1 and a second propeller shaft 2 are connected.

The first propeller shaft 1 has its front end connected to the output side of the internal combustion engine through a cross joint 3,
The propeller shaft 2 has a ring-shaped bearing support 5
The front part rotatably supported by the first propeller shaft 1
Is connected by a tripod type constant velocity universal joint 4, and the rear end of the second propeller shaft 2 is connected via a cross joint 6 to the power transmission member of the next stage.

A dynamic damper 10 is mounted inside the first propeller shaft 1 of the power transmission mechanism having such a structure. The dynamic damper 10 is shown in FIGS.
As shown in FIG. 1, a cylindrical outer ring member 11 and a cylindrical inner weight 12 located inside the cylindrical outer ring member 11 are connected to the outer ring member 11 and the outer ring member 11, which are elastic members that serve as a damper for damping the vibration. The support rubber member 16 is attached to the outer peripheral surface.

As shown in FIG. 3, the outer ring member 11 has a thickness
Made of 2.1 mm cold rolled steel plate SPCC with an outer diameter of 58.9 m
It has a substantially flat cylindrical shape of m and a width of 25 mm, and five circular holes 11a are formed at equal intervals in the circumferential direction. The inner weight 12 positioned inside the outer ring member 11 has an outer diameter of 42.8
mm, inner diameter 24.6 mm, width 33 mm.

The damping rubber member 15 for supporting the inner weight 12 at the center position inside the outer ring member 11 is formed by the outer ring member 11
5 thick connecting portions radially extending from the inner cylindrical portion 15b the thin outer cylindrical portion 15a attached to the inner peripheral surface of the inner cylindrical portion 15b and the inner cylindrical portion 15b attached to the outer peripheral surface of the inner weight 12 15
c has a shape in which the thin connecting portion 15d that closes between the connecting portions 15c and 15c is connected.

The supporting rubber member 16 adhered to the outer peripheral surface of the outer ring member 11 is in the form of a band having a thickness of about 2 mm and a length of 30 mm in the axial direction, and the supporting rubber member 16 is oriented in the five axial directions. And are attached to the outer peripheral surface of the outer ring member 11 at equal intervals. Both ends of the support rubber member 16 form bulging portions 16a that wrap around both end edges of the outer ring member 11, and the bulging portions 16a are inside the outer ring member 11 of the damping rubber member 15. It is continuous with the outer cylindrical portion 15a attached to the peripheral surface.

The five supporting rubber members 16 and the five thick connecting portions 15c of the vibration damping rubber member 15 are arranged alternately in the circumferential direction as shown in FIG. Further, the support rubber member 16 and the outer cylindrical portion 15a of the vibration damping rubber member 15 are closed so as to close the circular hole 11a formed in the outer ring member 11 interposed therebetween as shown in FIGS. 6 and 7. It is continued by the part 16b.

As described above, the damping rubber member 15 and the supporting rubber member 16 are continuously and integrally formed through the bulging portion 16a, which is an extension of the supporting rubber member 16, and the closing portion 16b. 11
And the inner weight 12 are vulcanized and bonded to form the dynamic damper 10.

The first propeller shaft 1 on which the dynamic damper 10 is mounted has an inner diameter of about 60 mm, which is slightly larger than the outer diameter (58.9 mm) of the outer ring member 11 itself, but the maximum diameter including the support rubber member 16 is increased. It is smaller than (62.9 mm).
Therefore, when the dynamic damper 10 is press-fitted into the first propeller shaft 1, the support rubber member 16 is pinched and flatly deformed, and then fitted and mounted at a predetermined position.

At this time, most of the support rubber member 16 is pinched by being sandwiched between the outer ring member 11 and the first propeller shaft 1, but the bulging portion 16a and the closing portion 16b are pinched. This is the place where you are not affected.

The supporting rubber member 16 has bulged portions 16a at both ends thereof.
Wrap around both edges of the outer ring member 11 inward, and the damping rubber member 15
Since it is integrally continuous with the outer cylindrical portion 15a attached to the inner peripheral surface of the outer ring member 11, the supporting rubber member 16 is separated from the outer ring member 11 by the inner peripheral surface of the first propeller shaft 1 during press fitting. There is no such problem.

Since the dynamic damper 10 is press-fitted into the first propeller shaft 1 by the elastic deformation of the support rubber member 16 partially attached to the outer peripheral surface of the outer ring member 11 as described above, the press-fitting work is easy. You can Even if there is some variation in the inner diameter tolerance of the first propeller shaft 1, the press-fitting operation itself is not affected at all.

After the dynamic damper 10 is press-fitted into the first propeller shaft 1 in this way, a cross joint 3 and a constant velocity universal joint 4 are attached to the end portion of the first propeller shaft 1 by frictionally welding their base portions. At this time, the first propeller shaft 1 is heated by frictional heat, and the supporting rubber member 16 of the dynamic damper 10 that is press-fitted receives a heat load.

Bulging portion 16a and closing portion 16b of the supporting rubber member 16
The parts other than are subjected to heat load while being pinched, so
So-called swelling, that is, permanent distortion and loss of elastic force, but the swelled portion 16a and the closed portion 16b that are not pinched
The elastic force can be maintained without causing permanent distortion, the required slip torque can be secured, and the outer ring member 11 can be reliably pressed and supported.

FIG. 7 shows the dynamic damper 10 with the first
After press fitting into the propeller shaft 1 and applying heat load,
FIG. 4 is a cross-sectional view of a main part showing a state of a support rubber member 16 when pulled out.

The two-dot chain line shows the initial state of the support rubber member 16, and after thermal loading, the parts other than the bulging part 16a and the closed part 16b are permanently elastically deformed to recover to the two-dot chain line. Although the restoring force is lost, the bulging portion 16a and the closing portion 16
It can be seen that b recovers to the vicinity of the chain double-dashed line and maintains the elastic restoring force.

Due to the elastic force of the bulging portion 16a and the closing portion 16b that is not lost, a necessary slip torque can be secured and the outer ring member 11 can be reliably pressed and supported.

In the dynamic damper 10 described above, the supporting rubber member 16 is attached to the outer peripheral surface of the outer ring member 11 in a strip shape so as to be oriented in the five axial directions, as shown in FIG. The support rubber member 21 may be attached to the entire outer peripheral surface of the outer ring member 11.

However, the other members of the dynamic damper 20 are the same as those of the dynamic damper 10 described above (the same members use the same reference numerals), and the supporting rubber member 21 has the bulged portion 21a and the unillustrated same as above. It has a blockage. Therefore, the necessary slip torque is always maintained by the bulging portion 21a and the closing portion, and the outer ring member 11 is surely maintained.
Is pressed and supported.

The holes formed in the outer ring member are not limited to circular holes, and various shapes are conceivable, and the size and number are not limited.

[0031]

According to the present invention, by providing the support elastic member for supporting the dynamic damper in the propeller shaft with the non-pressurizing portion, the non-pressurizing portion always maintains the slip torque required for the dynamic damper. It can be reliably pressed and supported.

[Brief description of the drawings]

FIG. 1 is a partially omitted side view showing a part of a power transmission mechanism by a propeller shaft of a vehicle according to an embodiment of the present invention.

FIG. 2 is a perspective view of the dynamic damper of the same embodiment.

FIG. 3 is a perspective view of an outer ring member and an inner weight of the same dynamic damper.

FIG. 4 is a front view of the dynamic damper.

FIG. 5 is a side view of the same.

6 is a cross-sectional view taken along the line VI-VI in FIG.

FIG. 7 is an enlarged view of a main part showing an unrestrained state of the supporting rubber member after a heat load.

FIG. 8 is a perspective view of a dynamic damper according to another embodiment.

FIG. 9 is a cross-sectional view showing a state in which a dynamic damper is fitted in a conventional propeller shaft.

[Explanation of symbols]

1 ... 1st propeller shaft, 2 ... 2nd propeller shaft, 3 ... Cross joint, 4 ... Constant velocity universal joint, 5 ... Bearing support, 6 ... Cross joint, 10 ... Dynamic damper, 11 ... Outer ring member, 12 ... Inner Weight, 15 ... Damping rubber member, 16 ... Support rubber member, 16a ... Swelling portion, 16b ... Closing portion. 20 ... Dynamic damper, 21 ... Support rubber member.

Claims (3)

[Claims] 1. A dynamic damper structure mounted inside a cylindrical propeller shaft for transmitting a driving force from an internal combustion engine to a driving wheel side, wherein a cylindrical outer ring member having an outer diameter slightly smaller than an inner diameter of the propeller shaft. And an inner weight located inside thereof, a structure in which a vibration damping elastic member is connected, and the outer ring member is squeezed between the outer circumferential surface of the outer ring member and the inner circumferential surface of the propeller shaft. A dynamic damper structure for a propeller shaft, wherein a supporting elastic member for supporting is adhered, and a non-clamping portion is provided on the supporting elastic member. 2. The supporting elastic member is bulged so that an axial end portion thereof wraps around an end edge of the cylindrical outer ring member, and the bulging portion serves as the non-clamping portion. A dynamic damper structure for a propeller shaft according to claim 1. 3. A plurality of holes are formed in the cylindrical outer ring member, the support elastic member is adhered to the outer peripheral surface of the outer ring member by closing the hole, and is attached to the hole of the support elastic member. The dynamic damper structure for a propeller shaft according to claim 1 or 2, wherein the corresponding closing portion is the non-clamping portion.