JPH04203641A - Plastic turning shaft with balance weight - Google Patents

Abstract

PURPOSE:To prevent the falling of a balance weight and any possible damage, etc., due to external physical factors from occurring by wrapping this balance weight, consisting of a metal set up and tacked onto the outer circumferential surface of a hollow pipe being composed of resin, with each covering material solidly and closely each. CONSTITUTION:In a specified part on the outer circumferential surface of a plastic hollow pipe 20 serving as a body part for a turning shaft 12, a metal balance weight 22 is tacked with a bonding agent, and the hollow pipe 20 and this tacked balance weight 22 are wrapped with each covering material 24 as one body. The resin hollow pipe 20 serving as the body part of the turning shaft 12 is wrapped of the circumference by the covering material 24 so that it will not contact with external circumstances directly. Therefore, at the time of car running, even in the case where a small stone or the like on a road surface is sprung up and hits to it, the covering material 24 is merely damaged, the hollow pipe 20 is prevented from being damaged. In consequence, even after use for a long period of time, such a possibility that strength in the resin turning shaft might be deteriorated and broken down is brought into nothing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a resin rotating shaft with a balance weight such as a resin propeller shaft or a resin drive shaft of an automobile.

(Prior Art) A propeller shaft of an automobile is a shaft that transmits the driving force of an engine from a transmission to a final reduction gear. This propeller shaft is generally composed of a universal joint, a slip joint, and a tube body (steel pipe), and a two-joint type, a three-joint type, a four-joint type, etc. are used depending on the type of vehicle. In addition, a metal balance weight (balance weight) is fixed at 2 degrees to the steel pipe that makes up the propeller shaft by a method such as welding, and in recent years there has been a huge demand for reducing the weight of vehicles. In order to meet this demand, various parts of automobiles are being replaced with lightweight materials such as resin, and propeller shafts are also desired to be made of resin.

(Problems to be Solved by the Invention) When the propeller shaft is made of resin, the problem arises as to how to fix the metal balance weight. For example, if the balance weight is fixed with an adhesive, the centrifugal force applied when the propeller shaft rotates may cause the balance weight to separate and fall off.

However, if the balance weight were to be made of resin and integrally molded with the propeller shaft to prevent it from falling off, it would be extremely large and unrealistic.

Another problem is that propeller shafts made of resin are more likely to be damaged than those made of metal if they are hit by pebbles or the like while the vehicle is running.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a resin rotating shaft with a balance weight, which prevents the balance weight from falling off or from being damaged by external physical factors.

(Means for Solving the Problems) The resin rotating shaft with balance weight of the present invention includes a hollow pipe made of resin, a balance weight made of metal disposed on the outer peripheral surface of the hollow pipe and temporarily fixed, and a This structure consists of an outer covering material that integrally covers the pipe and the balance weight in close contact with each other.

(Function) In the resin rotating shaft with balance weight of the present invention, the hollow pipe serves as the main body of the rotating shaft, for example, the tube of a propeller shaft. Since the outer covering material that encloses the hollow pipe isolates the hollow pipe from the outside environment, the impact caused by external physical factors that directly affects the hollow pipe is alleviated.

Furthermore, the jacket material always applies a force in the radial direction of the hollow pipe to the metal run weight that is integrally encapsulated with the hollow pipe. Further, since the outer covering material is in close contact with the hollow pipe and the balance weight, movement of the balance weight on the hollow pipe is prevented.

(Example) Hereinafter, the present invention will be described in detail based on the drawings. In addition,
In the following, a propeller shirt I will be described as an example of a resin rotating shaft with a balance weight.

In FIG. 1, a propeller shaft 10 is of a two-joint type, and a pipe body (rotating shaft) 12 is connected to a universal joint 14 at a connecting portion 13a at one end, and a universal joint 15 at a connecting portion 13b at the other end. It is connected to the slip joint 16 via the slide joint 16.

In the rotating shaft 12, a metal balance weight 22 is temporarily fixed with an adhesive or the like to a predetermined portion of the outer peripheral surface of a resin hollow pipe 20 serving as the main body. and,
The hollow pipe 20 and the balance weight 22 temporarily fixed to the hollow pipe 20 are integrally covered with a jacket material 24. As the balance weight 22, a plate-shaped metal whose shape matches the outer peripheral surface shape of the hollow pipe 20 can be used.

The outer covering material 24 can be formed from, for example, a resin sheet or a resin tube. This outer cover material 24 is
After temporarily fixing and arranging the balance weight 22 at a predetermined location on the outer circumferential surface of the hollow pipe 20, for example, a resin sheet is wound from the outside and the mating parts (overlapping parts at the beginning and end of the winding) are heat-sealed. Alternatively, it may be formed by fitting a resin tube pre-formed to a predetermined size. In this case, if a heat-shrinkable resin is used as the constituent material of the resin sheet and the resin tube, and the hollow pipe 20 and the balance weight 22 are integrally encapsulated by the method described above, and then heated and contracted, the hollow pipe 20 and the balance weight 22, and the balance weight 22 can be more firmly fixed to the hollow pipe 20.

Next, the function of the resin rotating shaft with balance weight of the present invention will be explained based on the propeller shaft 10 described above.

In the present invention, the hollow pipe 20 made of resin, which forms the main body of the rotating shaft 12, is surrounded by an outer covering material 24 and is not in direct contact with the external environment.

Therefore, even if a pebble or the like on the road surface is thrown off and hits the vehicle while the vehicle is running, the outer covering material 24 is only damaged, and the hollow pipe 20 is prevented from being damaged.

Further, even when the propeller shaft 10 rotates at high speed and centrifugal force is applied, the jacket material 24 presses the balance weight 22 attached to the outer peripheral surface of the hollow pipe 20 from the outside in the radial direction of the hollow pipe 20. Furthermore, the outer covering material 24
Since the balance weight 22 is in close contact with the hollow pipe 20, the balance weight 22 is prevented from moving on the hollow pipe 20 in the length direction or the circumferential direction.

(Effects of the Invention) The resin rotating shaft with balance weight of the present invention includes a hollow pipe made of resin, a balance weight made of metal placed on the outer peripheral surface of the hollow pipe and temporarily fixed, the hollow pipe and the balance. It is composed of an outer covering material that tightly covers the weight.

With such a configuration, even if external physical factors are applied to the resin rotating shaft with balance weight of the present invention, only the outer covering material will be damaged, and the hollow pipe will not be easily damaged. Therefore, even after long-term use, the strength of the resin rotating shaft does not decrease or break.

Furthermore, metal weights can be used as the balance weights as in the past, and the mounting position of the balance weights will not become blurred or fall off while the vehicle is running.

The resin rotating shaft with balance weight of the present invention can be applied to a resin propeller shaft or a resin drive shaft.

[Brief explanation of the drawing]

FIG. 1 is a front view of a propeller shaft as an example of the resin rotating shaft with balance weight of the present invention, and FIG.
It is a partial sectional view taken along the line ■-■ in the figure. DESCRIPTION OF SYMBOLS 10... Propeller shaft, 12... Pipe body (rotating shaft), 20... Hollow pipe, 22... Balance weight, 24... Outer covering material. Applicant Mitsubishi Motors Corporation Agent Patent Attorney Kanji Nagado

Claims (1)

[Claims] A hollow pipe made of resin, a balance weight made of metal arranged and temporarily fixed on the outer circumferential surface of the hollow pipe, and an outer cover that covers the hollow pipe and the balance weight integrally and in close contact with each other. A resin rotating shaft with a balance weight, characterized by being made of material.