JPH03288041A - Propeller shaft - Google Patents

Abstract

PURPOSE:To easily insert and fit a dynamic damper into a shaft by the deformation of a rubber layer, and firmly fix the damper by elastic force of the rubber layer by inserting and fitting the cylindrical dynamic damper provided with the rubber layer on its outer peripheral surface into the hollow shaft of a propeller shaft. CONSTITUTION:A cylindrical dynamic damper 19 provided with a rubber layer 23 on its outer peripheral surface, is inserted and fitted into the shaft 18 of a propeller shaft 17. The dynamic damper 19 can be easily inserted and fitted into the shaft 18 by the deformation of the rubber layer 23 and firmly fixed by elastic force of the rubber 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a propeller shaft provided with a dynamic damper therein.

(Prior Art) In front engine rear drive (so-called FR type) automobiles, a transmission and a differential device are connected through a propeller shaft to transmit power. Further, in a four-wheel drive vehicle as shown in FIG. 5, for example, a propeller includes a transfer 2 connected to a transmission 1 and differential devices 3.4 provided at the front and rear. 7 in the diagram
is the engine and 8 is the wheel.

Such a professional spatula shaft rotates at high speed and transmits high torque with fluctuations, so it is likely to become a source of vibration and noise.

Therefore, conventionally, as shown in FIG. 6, for example, a dynamic damper 13 is provided inside a propeller shaft 12, which has joints 10 and 11 fixed to both ends of a shaft 9 made of a hollow steel tube, to suppress the generation of vibration and noise. There is something I did. As shown in FIG. 7, this dynamic damper 13 has a cylindrical weight 16 inserted and glued into an outer cylinder 14 through an elastic body 15 such as rubber. It is installed by a fit.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional method, the dynamic damper 13 is fixed by fitting the shaft 9 and the outer cylinder 14, so there are the following problems.

The dynamic damper 1 is
The inner diameter of the shaft 9 and the outer cylinder 14 are
Since high precision is required for the outer diameter of the machine, productivity is low and costs are high. In addition, in order to ensure a strong fit and to insert the dynamic damper 13 into the center of the shaft 9, a press-fitting device and a jig are required to press-fit with a large force, which increases the cost of production equipment. .

The present invention has been made in view of the above points, and an object of the present invention is to provide a propeller shaft to which a dynamic damper can be easily and firmly attached.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a rubber layer 23 on the outer peripheral surface of the hollow shaft 18 of the propeller shaft 17.
It is characterized in that a cylindrical dynamic damper 19 with a cylindrical shape is inserted therein.

(Function) By configuring the propeller shaft 17 of the present invention in this way, the dynamic damper 19 can be easily inserted into the shaft 18 by the elastic deformation of the rubber layer 23, and the elastic force of the rubber layer 23 can make it strong. can be fixed to.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows the main parts of the propeller shaft 17 of this embodiment. In FIG. 1, a cylindrical dynamic damper 19 is inserted into a hollow shaft 18. The shaft 18 is a hollow steel tube with a thin wall and no uneven thickness. The dynamic damper 19 has a cylindrical weight 22 inserted and bonded to a cylindrical outer cylinder 20 via an elastic body 21, and a rubber layer 23 is provided on the outer peripheral surface of the outer cylinder 20. Elastic body 2
Alternatively, rubber may be used and baked onto the outer cylinder 20 and the weight 22. Dynamic damper 1 as shown in Figure 2
The outer diameter of the rubber layer 23 of 9 is set larger than the inner diameter d of the shaft 18, and the dynamic damper 19 inserted into the shaft 18 is fixed by the elastic force of the rubber layer 23. . Further, the rubber layer 23 near both ends of the dynamic damper 19 has a thinner wall thickness, and the outer diameter of both ends of the dynamic damper 19 is reduced to facilitate insertion into the shaft 18.

As shown in FIG. 3, both ends of the shaft 18 are sealed with yokes 24 and 25 that constitute a hook type joint.

The operation of this embodiment configured as above will be explained next.

The propeller shaft 17 is attached to a vehicle by connecting it to a transmission, a differential, a transfer, etc. via a hook-type joint formed by yokes 24 and 25, as in the conventional case.

Although the outer diameter of the dynamic damper 19 is larger than the inner diameter d of the shaft 18, the rubber layer 23 is compressed and deforms elastically, so that it can be inserted into the shaft 18. The dynamic damper 19 inserted into the shaft 18 is fixed by friction between the outer peripheral surface of the rubber layer 23 and the inner peripheral surface of the shaft 18 and elastic force. At this time, the elastic deformation of the rubber layer 23 absorbs the dimensional tolerance of the inner diameter of the shaft 18 and the outer diameter of the outer cylinder 20, so even if there is some error in the inner diameter of the shaft 18 and the outer diameter of the outer cylinder 20, the rubber layer layer 23
The outer circumferential surface of the dynamic damper 19 comes into close contact with the inner circumferential surface of the shaft 18, and the dynamic damper 19 is firmly fixed. Furthermore, since the magnitude of the frictional force between the rubber layer 23 and the shaft 18 can be adjusted depending on the thickness and hardness of the rubber layer 23, the friction force between the rubber layer 23 and the shaft 18 can be adjusted. By setting the wall thickness (outer diameter) and hardness of the layer 23, movement of the dynamic damper 19 can be prevented.

The dynamic damper 19 can be attached to the shaft 18 by applying a lubricant such as soapy water to the inner surface of the shaft 18 or the rubber layer 23 to reduce the friction between the shaft 18 and the rubber layer 23. As shown in Figure 4, the dynamic damper 1 is coated with soapy water, etc.
9 into the shaft 18, and manually press it into a predetermined position using a jig 26 having a long handle that can be inserted into the shaft 18.

After inserting the dynamic damper 19 into the predetermined position,
When the lubricant such as soapy water dries, the shaft 18
The friction between the dynamic damper 19 and the rubber layer 23 increases, and the dynamic damper 19 is firmly fixed. Furthermore, after the lubricant dries, the inside of the shaft 18 is sealed by attaching the yokes 24 and 25 to both ends of the shaft 18.
The frictional force of the rubber layer 23 of the dynamic damper 19 attached to the dynamic damper 19 does not decrease.

(Effects of the Invention) As described in detail above, the present invention has a cylindrical dynamic damper with a rubber layer on the outer circumferential surface inserted into the hollow shaft of the propeller shaft. The damper can be easily inserted into the shaft and can be firmly fixed by the elastic force of the rubber layer. As a result, when inserting and fitting the dynamic damper into the shaft, only a small force is required for press-fitting the dynamic damper, so that the dynamic damper can be inserted and fitted without a press-fitting device. Further, by applying a lubricant such as soapy water to the rubber layer, friction during insertion can be reduced, and the insertion can be easily performed manually using a jig.

Even if there is some error in the dimensions of the inner diameter of the shaft and the outer diameter of the dynamic damper due to the elastic deformation of the rubber layer, the outer circumferential surface of the rubber layer will come into close contact with the inner circumferential surface of the shaft, and the dynamic damper will be firmly fixed. . Therefore, since it is not necessary to increase the dimensional accuracy of the shaft, there is an excellent effect that productivity is improved and costs are reduced.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view of the main part of one embodiment of the present invention, Fig.
The figure is a partial vertical sectional view of a dynamic damper according to an embodiment of the present invention, FIG. 3 is a partially cutaway view of an embodiment of the present invention, and FIG. A partial longitudinal cross-sectional view showing where the damper is inserted, Fig. 5 is a diagram showing the power transmission system of a four-wheel drive vehicle, Fig. 6 is a partially cutaway view of a conventional propeller shaft, and Fig. 7 is a partial vertical sectional view of the main parts of a conventional propeller shaft. Fig. 1 17--Prohela shaft 18...Shaft 19...Dynamic damper 23...Rubber layer

Claims (1)

[Claims] (1) A propeller shaft characterized in that a cylindrical dynamic damper with a rubber layer provided on the outer circumferential surface is inserted into a hollow shaft that transmits rotational force.