JPH0374630A - Joint for expansion pipe - Google Patents

Abstract

PURPOSE:To dispense with boring on a pipe and prevent the occurrence of cracks by pinching the expanded section of an expansion pipe with taper split spacers dividedly arranged on the outer periphery of the expansion pipe, and connecting the expansion pipe and a shaft member. CONSTITUTION:Split spacers 4a and 4a are arranged on the outer periphery of the expanded section 21 of an expansion pipe 2, and split spacers 4a and 4a are supported by a support pipe 5. When a flange member 6 is fastened to the support pipe 5, split spacers 4a and 4a and the cone section 61 of the flange member 6 firmly pinch the expanded section 21 via the taper action of the expanded section 21. The connection end section of a driving shaft 1 is inserted into the connection section 63 of the flange member 6, the driving shaft 1 and the flange member 6 are connected by a pin 11, thus the flange member 6 and the driving shaft 1 are integrally connected in the rotating direction. No scar such as a hole is bored on the expansion pipe 2, thus the partial concentration of a load is eliminated, and high torque can be transferred.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an expansion pipe that connects an expansion pipe having an enlarged diameter portion whose end portion is gradually increased in diameter, and a drive shaft of an automobile, for example. between the joints.

(Prior Art) Conventionally, joining means for joining a pipe to a suitable shaft member such as an automobile drive shaft include joining by adhesive, joining by shrink fit and cold fit, and fastening with rivets, bolts, etc. Connections using members, etc. were applied.

(Problems to be Solved by the Invention) However, each of the conventional joining means described above has the following problems.

First, when joining by adhesive, cracks tend to occur due to M, 9, etc., and there is a risk of slipping when transmitting high torque.When joining by shrink fit and cold shrinkage,
Although high bonding strength can be obtained, high precision is required in processing the bonded portion, and centering during bonding is time-consuming and difficult. In addition, when joining using fastening members such as rivets and bolts, the load during rotation transmission is concentrated on the fastening parts of both parts that are fastened by the fastening member, and when high torque is transmitted, this fastening part Damage such as cracks may occur in the
Furthermore, there is a problem in that the rotational balance becomes unstable due to the fastening of the fastening member.

(Means for Solving the Problems) The expansion pipe joint of the present invention is a joint for an expansion pipe that joins an expansion pipe having a diameter-expanding portion whose end portion is formed to gradually increase in diameter and an appropriate shaft member. , the joint includes an annular split spacer that is arranged in segments on the outer circumferential surface of the enlarged diameter section of the expanding pipe, and the abutment surface that contacts the outer circumferential surface of the enlarged diameter section is tapered in the same manner as the enlarged diameter section; It is composed of a support tube that supports the divided spacer, and a flange member that has a cone portion that holds the enlarged diameter portion between the divided spacer and is screwed onto the support tube.

(Function) The expanded diameter portion of the expanded pipe is held between the split spacer and the cone portion of the flange member by utilizing the taper of the expanded diameter portion of the expanded pipe, thereby appropriately joining the expanded pipe to the shaft member.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a case will be described in which an expansion pipe and a drive shaft are joined.

The figure shows a joint for an expansion pipe according to the present invention.

In the figure, l is a drive shaft of an automobile engine or the like, and an expansion pipe 2 is connected to the joint end of the drive shaft 1 via a joint 3.

The expanding pipe 2 is made of FRP, and has an expanded diameter portion 21 whose end portion is gradually enlarged in diameter.

The joint 3 holds the expanded diameter portion 21 between an annular divided spacer 4 arranged on the outer peripheral surface of the expanded diameter portion 21 of the expanded pipe 2, a support tube 5 that supports the divided spacer 4, and the divided spacer 4. It is comprised of a flange member 6 having a cone portion 61, screwed onto the support tube 5, and connected to the drive shaft via the pin 11.

The divided spacer 4 is a half spacer 4a divided into two parts.
, 4a, and the expanded diameter portion 2 of the expanded pipe 2
The inner surface in contact with the enlarged diameter portion 21 is tapered like the enlarged diameter portion 21.

The support tube 5 is such that the half spacers 4a, 4a are arranged on the outer circumferential surface of the enlarged diameter portion 21 in contact with the outer circumferential surface of the half spacers 4a, 4a, and the half spacers 4a, 4a are disposed on the outer circumferential surface of the enlarged diameter portion 21, and the half spacers 4a, 4a are disposed on the outer circumferential surface of the enlarged diameter portion 21. Hook-shaped locking pieces 51 that engage with the end edges of the portions 4a, 4a are formed, and a male screw 5 is formed on the outer peripheral surface of the one end portion 5a.
2 is formed.

The flange member 6 includes a truncated cone-shaped cone portion 61 having the same taper as the expanded diameter portion 21 of the expansion pipe 2, and a ring portion 62 having a female thread 62a that screws into the male thread 52 of the support tube 5. an annular joint 63 into which the drive shaft l is fitted;
are integrally formed.

Next, a case will be described in which the joint 3 is used to join the expansion pipe 2 and the drive shaft 1.

First, the half spacers 4a, 4a are placed on the outer peripheral surface of the enlarged diameter portion 21 of the expanded pipe 2, and the support tube 5 supports these half spacers 4a, 4a. By tightening the flange member 6 to the support tube 5, the half spacers 4a, 4a and the cone portion 61 of the flange member 6 firmly clamp the enlarged diameter portion 21 due to the taper action of the enlarged diameter portion 21. It is tightened and integrally connected to the expansion pipe 2. Then, by fitting the joint end of the drive shaft 1 into the joint part 63 of the flange member 6 and joining the drive shaft l and the flange member 6 with the pin 11, the flange member 6 and the drive shaft 1 are connected to each other as the drive shaft. Connect integrally in one direction of rotation.

In addition, as a locking mechanism between the support tube 5 and the flange member 6,
If necessary, apply adhesive and screw in, or
A detent pin 7 may be driven into the support tube 5.

In the joint 3 configured in this way, the split spacer 4 and the cone portion 61 of the flange member 6 firmly clamp the expanded diameter portion 21 using the taper of the expanded diameter portion 21, so that the expanded pipe 2 can be attached to the expanded pipe 2. Since it can be joined without creating holes or other damage, the load during rotation transmission is not concentrated in one part, so it can withstand high torque transmission and is resistant to fatigue.

Therefore, even the expanded pipe 2 made of FRP as in this example can sufficiently withstand high torque transmission. Therefore, by using this joint 3, it becomes possible to use the expanded pipe 2 made of FRP as a propeller shaft of an automobile.

Note that the expanding pipe 2 is not limited to one made of FRP as in this example, but may be made of metal.

In addition, in this example, the joint 3 was used for rotation transmission, but
The purpose of use, such as for fixing, is not limited.

(Effects of the Invention) As described above, according to the expanding pipe joint of the present invention, the split spacer and the cone portion of the flange member firmly clamp the expanded diameter portion by utilizing the taper of the expanded diameter portion. With this, it is possible to join the expanded pipe without creating holes or other damage, and it is possible to prevent the occurrence of cracks due to fatigue. In particular, when the joint of the present invention is used for rotation transmission, the load during rotation transmission is not concentrated in one part, it can withstand high torque transmission, and it is resistant to fatigue. In addition, it has a simple structure and easy processing,
Since the taper of the enlarged diameter portion is used for joining, centering during joining can be easily performed.

[Brief explanation of drawings]

The figure is a sectional view showing a joint for an expansion pipe according to the present invention. 1... Drive shaft (shaft member) 3... Joint 5... Support pipe 21... Expanded diameter section 2... Expanded pipe 4... Divided spacer 6... Flange member 61... cone part

Claims (1)

[Scope of Claims] 1) A joint for an expansion pipe that joins an expansion pipe having a diameter expansion portion whose end portion is formed to gradually increase in diameter and an appropriate shaft member, wherein the joint is configured to expand the diameter of the expansion pipe. an annular divided spacer which is dividedly arranged on the outer circumferential surface of the part and whose abutting surface that contacts the outer peripheral surface of the enlarged diameter part is tapered similarly to the enlarged diameter part, and a support tube that supports the divided spacer; A joint for an expanding pipe, characterized in that it is comprised of a flange member having a cone portion that holds the enlarged diameter portion between the split spacer and the flange member that is screwed onto the support tube.