JPH03223520A - Fiber reinforced shaft with flange and manufacture thereof - Google Patents

Abstract

PURPOSE:To surely constitute a joint only with a bolt and dispense with secondary machining by separating a main body part core after winding FRP fiber on the outer circumference of the main body part core and an end part core, and fitting a flange member to the end part core made of metal. CONSTITUTION:An end part core 11 made of metal is fixedly secured on the inner circumference of the end part of a FRP shaft 10. A flange member 13 is fixedly secured to the end part core 11 of the FRP shaft. A core shaft 14 concentrically formed in one body with the flange member 13 and having an elliptical section is fitted into the hole 12 of the end part core. A main body core 17 and the end part core 11 are previously connected to each other, and FRP fiber 20 is wound on the outer circumference, hereafter the main body part core 17 is separated, and the flange member 13 is fitted into the end part core 11 made of metal. Thus, the joint is surely constituted only with a bolt, dispensing with secondary machining.

Description

[Detailed Description of the Invention] (Industrial Application Field) When fiber-reinforced shafts (hereinafter referred to as FRP shafts) are formed using a filament winder and then connected to each other, bolt connections or frictional force are often relied upon. However, both require secondary processing.

The present invention relates to a flanged FRP shaft that does not require secondary processing and a method for manufacturing the same.

(Prior art) Figures 9 and 10 show a known joint structure for an FRP shaft (N
AVAL ENGINEER5JOURNAL, JUL
1986), FIG. 9, steel flanges 2a and 2b are fitted inside and out to the end of the FRP shaft 1, bolt insertion holes are made by machining, and bolts 3 are passed through and fixed.

This structure has a problem in that the FRP shaft must be mechanically drilled, a process that is most avoided when using this type of material.

Also, Fig. 10 shows another joint structure for the FRP shaft (utility development 6
1-184121), this relates to the coupling structure between the hollow FRP shaft 4 and the metal yoke 5. One end of the metal yoke 5 forms a cylindrical portion 6, into which the FRP shaft 4 is inserted. The end of the FRP shaft 4 is the outer cylindrical part 6
and the inner cylindrical wedge 7, and a core bar 8 having the same tapered surface as the cylindrical wedge 7 is inserted inside the cylindrical wedge 7, and the core bar 8 is inserted into the cylindrical part 6 of the metal yoke 5. A bolt 9 attached to the bottom of the housing is pulled in and frictionally connected. In this structure, the FRP shaft 4 and the metal yoke 5 are coupled by friction between the cylindrical wedge 7 and the FRP shaft 4, and between the cylindrical portion 6 and the FRP shaft 4, thereby making it possible to transmit torque.

However, with this structure, the condition is that the end of the FRP shaft 4 does not move from the bottom of the metal yoke, but since the connection is only based on frictional force, the adhesion between the FRP shaft 4 and yoke 5 deteriorates with use, and finally Otherwise, the joint structure may be completely destroyed.

(Problem to be solved by the invention) To eliminate secondary machining such as cutting the FRP shaft and drilling holes in the FRP shaft when joining, and to create a highly reliable FRP shaft that can reliably construct a joint using only bolts. The purpose is to provide.

(Means for solving the problem) A hollow FRP shaft, an end core that is integrally fixed to the shaft end of the FRP shaft and has a hole with an oval cross section in the center, and a core that fits into the hole with an oval cross section. A flange member with an elliptical cross section was fitted into a hole in the end core, and the flange member was fixed to the end core with threaded bolts to form a flanged FRP shaft.

Also, a core material consisting of a main body core and an end core that is fixed to the main body core from the side with screw bolts, has a plurality of radial winding pins at the end, and has a hole with an oval cross section in the center. The FRP fiber was wound around the core until it reached a predetermined thickness, and then the screw bolts were removed to separate the core from the main body, and the elliptical cross section provided at the center of the flange member was inserted into the oval hole in the end core. Later, by fixing the flange member to the end core from the side with threaded bolts, it became possible to manufacture a flanged FRP shaft.

(Implementation N) The FRP shaft according to the present invention will be explained based on FIGS. 1 to 3. FIG. 1 is a detailed view of the end of the FRP shaft. 10
1 is an FRP shaft, and 11 is a metal end core fixed to the inner periphery of the 1° end of the FRP shaft, which has a hole 12 having an oval cross section as shown in FIG. 13 is a flange member fixed to the end core 11 of the FRP shaft. Reference numeral 14 is a support having an oval cross section that is integrally concentric with the flange member 13 and is fitted into the oval hole 12 of the end core.

The flange member 13 is attached to the end core 11 with threaded bolts 15.
is combined with Also, a bolt insertion hole 1 that is connected to other shafts, etc.
It also has 6. Reference numeral 15' designates a screw hole in the end core 11 that corresponds to the threaded bolt 15.

(Manufacturing method of FRP shaft) This will be explained based on FIGS. 4 to 8. In FIG. 4, reference numeral 17 is a main body core around which FRP fibers are wound. Reference numeral 11 denotes an end core fixed to the end of the main body core 17 with a plurality of threaded bolts 18 (four in the figure), and an oval hole 12 is provided in the center. Winding pins 19 are installed in the radial direction around the end of the end core 11, and have a length corresponding to the amount of winding of the FRP fiber.

The end core 11 is removably fixed to the main body core 17 from the side with threaded bolts 18.

The FRP fiber 20 is wound around the cores 17 and 11 having such a structure, and is again folded in the opposite direction at the winding pin 19 and wound repeatedly to a predetermined thickness (FIG. 5).

Once it has been wound to a predetermined thickness, the winding stops there. Next, the threaded bolt 18 is removed and the main body core 17 is removed, leaving the end core 11 and the FRP fiber 20 wound thereon (FIG. 6).

The core 14 of the flange member 13 is inserted into the oval hole 12 of the end core 11 that remains after the main body core 17 is pulled out. As a matter of course, the cross section of Shinyori 14 is elliptical. Note that the FRP wound around the end core 11 of the flange member 13
Since the side end surface, which is the folded portion of the fiber 20, bulges out laterally, an annular recess 21 is provided for escaping this bulge (FIG. 7(b)). 22 is a screw hole for fixing the flange member 13 to the end core 11.

After fitting each shaft 14 of the flange member 13 into the hole 12,
Attach the flange member 13 to the end core 11 with screw bolts 23
It will stick.

In this way, the FRP shaft as shown in FIG. 1 is completed.

(Effects) The main body core and end core were connected in advance, FRP fiber was wrapped around the outer periphery of the core, the main body core was separated, and the flange member was attached to the metal end core. Since no mechanical processing is applied to FRP fibers,
The problem of strength loss has completely disappeared.

Furthermore, since the end core and the flange member are a combination of an elliptical hole and an elliptical center shaft, the problem of slippage during torque transmission is eliminated.

Furthermore, since the flange member is connected with threaded bolts using the attachment hole between the end core and the main body core on top of the fit between the elliptical hole and the elliptical center shaft, torque transmission is performed efficiently.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flanged FRP shaft according to the present invention. FIG. 2 is a sectional view taken along line nn in FIG. 1. Figure 3 is a right side view of Figure 1. Figures 4 to 8 are diagrams showing the method for manufacturing a flanged FRP shaft, and Figure 4 (a) shows the state before winding the FRP fibers;
FIG. 4(b) is a right side view of FIG. 4(a). FIG. 5(a) is a sectional view of the wound FRP fiber, and FIG. 5(b) is a right side view of FIG. 5(a). Fig. 6(a) is a diagram showing the state in which the main body core is pulled out;
FIG. 6(b) is a right side view of FIG. 6(a). FIG. 7(a) shows a state in which the flange member is about to be attached. FIG. 7(b) is a sectional view of the flange member. Figure 8 shows the completed state of the flanged FRP shaft. 9 and 10 are cross-sectional views showing a known FRP shaft joint. In the figure; l FRP shaft 2a, 2b steel flange 3
Bolt 4 FRP shaft 5 Metal yoke 6 Cylindrical portion 7 Cylindrical wedge 8 Core metal 9 Bolt 10 FRP shaft 11 End core 12 Hole 13 Flange member 14 Each shaft 15 Bolt 15' Screw hole 16 Bolt insertion hole
17 Main body core 18 Bolt 19
Winding pin 20 FRP fiber 21 Annular recess 22
Screw hole 23 Screw bolt or more

Claims (2)

[Claims] (1) a hollow fiber-reinforced shaft; an end core that is integrally fixed to the shaft end of the fiber-reinforced shaft and has a hole with an oval cross section in the center;
a flange member having a core shaft in the center that fits into the hole having an oval cross section; the core shaft having an oval cross section is fitted into the hole in the end core, and the flange member is attached to the end core with a threaded bolt. A flanged fiber-reinforced shaft that is fixed to the core. (2) From a main body core and an end core that is fixed to the main body core from the side with threaded bolts, has a plurality of radial winding pins at the end, and has a hole with an oval cross section in the center. The fiber-reinforced shaft is wound around the core material until it reaches a predetermined thickness, and then the screw bolts are removed to separate the main body core, and the elliptical cross section provided at the center of the flange member is inserted into the oval hole of the end core. 1. A method for manufacturing a fiber-reinforced shaft with a flange, which comprises fitting a shaped center shaft into the shaft and then fixing a flange member to the end core from the side with threaded bolts.