JP5419132B2 - Handheld power working machine and power transmission joint - Google Patents

Description

Detailed Description of the Invention

  The present invention provides power transmission in which a tip end of a drive shaft provided in an operating rod and a power input portion on the work device side are engaged with and connected to each other even if they have different shapes that do not engage with each other. The present invention relates to a hand-held power working machine equipped with a joint for power and a joint for power transmission.

Conventional technology

For example, hand-held power work machines such as brush cutters, mowers, hedge trimmers, and high branch cutters are usually sold with one of these working devices attached to the tip of the operating rod with a motor. is there.
In many cases, as shown in FIG. 6 of Patent Document 1, this mounting is performed by fitting and holding the front end portion of the operating rod 7 made of metal pipe into the rear end portion of the short cylindrical portion provided in the working device. It is done by a method of fastening and fastening with bolts. Then, along with this insertion / holding, the tip of the drive shaft 11 was plunged / engaged into the power input part on the working device side (the hollow shaft part of the bevel gear 27 corresponds to this) and output from the prime mover. Rotational power is transmitted to the power input unit on the working device side through the drive shaft 11, and the engagement performed between the tip portion and the power input unit includes spline engagement, serration engagement, or the like. There is. And the number of teeth for spline engagement and serration engagement varies depending on the manufacturer and model, such as 6-13.

By the way, recently, if either a motorized operation rod or a work device of a hand-held power work machine breaks down, these can be purchased individually so that only a motorized operation rod or a work device can be purchased. May have been sold to. Further, in order to reduce the equipment purchase cost, it is possible to attach a work device suitable for the work contents to one operation pole with a motor.
Conventionally, in order to cope with such a case, it is necessary to make the shape of the tip end portion of the drive shaft coincide with the shape of the inner wall of the power input portion on the working device side.

FIG. 6 of Japanese Patent Application Laid-Open No. 64-30510

Problems to be solved by the invention

However, as described above, confirmation of matching the shape of the tip end portion of the drive shaft with the shape of the power input portion on the working device side is troublesome and easy to make a mistake.
In addition, many consumers do not know that a motorized control rod and a different type of work device are combined, so even if the engine breaks down, it is necessary to replace the entire handheld power work machine, etc. Was high. In addition, having multiple kitchens with hand-held power work machines that match the work content was a heavy burden on storage space.

  The problem to be solved by the present invention is to provide a hand-held power working machine capable of reducing the cost of purchasing and replacing equipment and improving the storage space, and this power transmission joint.

Means for solving the problem

A hand-held power work machine according to claim 1 is:
A hollow pipe structure with a prime mover consisting of an engine or electric motor mounted at the rear, and a work device that inputs rotational power from the drive shaft and drives it at the tip of an operating rod equipped with a drive shaft inside Has a basic structure,
The working device can be replaced with a working device selected in accordance with the work purpose in addition to the brush cutter device,
Even if the tip portion of the drive shaft and the power input portion of the selected working device do not correspond,
On the rear side, it has a cylindrical fitting part consisting of any of spline inner wall, serration inner wall, square inner wall, and two-sided inner wall, and on the front side, spline shaft, serration shaft, square axis, two-chamfered shaft Among the plurality of types of power transmission joints having a shaft-like fitting portion, or a spline inner wall, a serration inner wall, a square inner wall, or a cylindrical fitting portion made of two chamfered inner walls, the rear side is the aforementioned A power transmission joint is selected in which the front end of the drive shaft is plunged and engaged so as to be able to rotate, and the front side is engaged so as to be able to rotate along with the power input portion of the selected working device.
It is characterized in that the tip end portion of the drive shaft and the power input portion of the selected work device are connected via the selected power transmission joint.

In this hand-held power work machine, the rotational power output from the prime mover is transmitted from the drive shaft to the power input unit on the work device side through the power transmission joint.
Even when the tip of the drive shaft and the power input portion on the work device side are different, the rear side engages with the tip of the drive shaft so as to be able to rotate, and the front side engages with the power input portion so as to be able to rotate. When the power transmission joint to be combined is used, the tip end portion of the drive shaft and the power input portion on the working device side are connected to each other so as to be able to rotate.
In this regard, the joint that connects the intermediate length portions of the drive shaft shown in FIGS. 2 and 3 of the Japanese Utility Model Publication No. 62-7857, FIGS. 3 to 8 of the Japanese Utility Model No. 3119138, etc. Not only the structure but also the action and effect are completely different.
There are a plurality of types of power transmission joints having different shapes and sizes, and a power transmission joint suitable for the shape of the power input portion or the tip of the drive shaft is selectively used.
Engagement makes it possible turns with is a spline engagement, serration engagement, engagement by square shaft and a square hole, engagement due and secondary chamfered square shaft and the secondary chamfered square hole.

Claim 2 is an invention of a power transmission joint equipped in the hand-held power working machine according to claim 1,
The power transmission joint consists of a main joint and a nest.
The nesting has a fitting portion that engages the tip of the drive shaft at the center thereof so that the tip of the nesting can enter and rotate.
The main joint has a shaft portion or a cylindrical fitting portion that engages with a power input portion of the selected working device on the front side, and is immersed in a state in which the insert is in close contact with the rear side. It has a feature in that it has a cylindrical fitting part that can be rotated together .

The power transmission joint according to a second aspect includes, in addition to the main joint, a nest that is inserted into the rear portion of the main joint so as to be able to rotate and engages so that the front end portion of the drive shaft is inserted and can be rotated. A plurality of types of nestings are prepared in accordance with the shape of the tip of the drive shaft, and those that match the shape of the tip of the drive shaft to be connected are selected and used. If it does in this way, the rotational drive force added to a drive shaft will be transmitted to the said power input part via this power transmission joint.

The power transmission joint according to claim 3 is:
A longitudinal groove is formed on the inner circumferential surface of the fitting portion on the rear side of the main joint, and a convex groove that engages with the groove is formed on the outer circumferential surface of the insert.
The main joint and the nest inserted into the fitting portion on the rear side of the main joint are configured to be rotated together by engagement between the groove and the protrusion .

In the power transmission joint according to claim 3, the cylindrical fitting portion formed on the rear side of the main joint and the nest inserted into the fitting portion are rotated together. This is made possible by engaging the groove formed on the inner peripheral surface with the convex strip formed on the outer peripheral surface of the insert.

A power transmission joint according to a fourth aspect of the present invention is the power transmission joint according to the second or third aspect, wherein the nesting is formed by overlapping a plurality of ring plates.

  The nesting made by stacking multiple ring plates is more difficult to manufacture by nesting a ring plate formed by pressing a metal plate than by forming a single nesting with a complicated structure. This is because it can be performed easily and at low cost.

Effect of the invention

According to the hand-held work machine according to claim 1,
Even if the tip of the drive shaft provided in the operating rod does not correspond to the power input part of the working device, the power that engages both the tip and the power input part so as to be able to rotate. As a result of selecting the transmission joint and connecting the distal end portion and the power input portion via the selected power transmission joint, the operating rod with the motor and the working device of different manufacturers and models Can be installed in any combination.
As a result, it has become possible to replace only the operating rod with a prime mover or a working device of a desired model according to the work purpose.
As a result, the economy and convenience can be improved, and the storage space can be reduced.
Moreover, when combining the motor- operated operating rod and the working device , it is no longer necessary to confirm the shape of the tip end portion of the drive shaft and the shape of the power input portion, which has been troublesome and easy to make mistakes.

According to the power transmission joint according to claim 2,
Even when the shape of the tip end portion of the drive shaft are different, simply by replacing the nested, simply and economically, and to be able to take Mawari connected the distal end of the drive shaft and the power input unit became.

The power transmission joint according to the third aspect has the same effect as the power transmission joint according to the second aspect.

According to the power transmission joint according to claim 4,
As a result of constituting the nesting by superimposing a plurality of ring plates, the nesting can be performed using an inexpensive ring plate made by press working.

  The best mode for carrying out the present invention is that of the following embodiment.

FIG. 1 is a perspective view illustrating one example of a hand-held power working machine according to the present invention and a work device that can be replaced.
A hand-held power work machine 1 shown in FIG. 1 is a brush cutter in which a working device (a brush cutter device) 10 is attached to the tip of an operating rod 2 with a motor. The motor-operated operation rod 2 has an engine 4 mounted on the rear portion of the operation rod 3 and a handle 5 with both hands attached to a portion of the length of the operation rod 3. A shoulder belt is attached to 3. In addition, instead of the brush cutter 10, for example, a nylon cord mowing device 11, a clipper type brush cutter 12 or 13, and a rotary soil can be used in the operating rod 2 with a prime mover of the handheld power working machine (brusher) 1. It is possible to attach working devices such as the tilling device 14, the blower 15, and the rotating brush 16.

2A is a side cross-sectional view illustrating the brush cutter and the tip of the operating rod, FIG. 2B is a partial plan sectional view of the inside of the brush cutter, and FIG. 3 is the tip of the operating rod and the brush cutter side. It is side surface sectional drawing which connected and showed the motive power input part.
According to the brush cutter 10 shown in FIG. 2A, an upper blade 21 and a lower blade 22 that are rotary blades are provided below the main gear case 23. A main shaft 24 is rotatably supported at a substantially central portion of the main gear case 23, a large-diameter spur gear 32 is loosely supported on the lower portion of the main shaft 24, and a large-diameter spur gear 31 is associated with the upper portion of the main shaft 24. It is engaged and supported so that it can rotate. A rear gear case 25 is attached to the rear upper surface of the main gear case 23, and a short cylindrical portion 26 is formed to project obliquely upward and rearward from the center of the rear end of the rear gear case 25. The rear portion of the short cylindrical portion 26 is a portion into which the distal end portion 3a of the operating rod 3 is inserted, and the shaft 27a of the small-diameter bevel gear 27 is rotatably held at the front portion in the cylinder of the short cylindrical portion 26. . The small-diameter bevel gear 27 meshes with a large-diameter bevel gear 29 supported so as to be able to rotate with the second shaft 28 in the rear gear case 25.
As shown in FIGS. 2 (a) and 2 (b), a small-diameter spur gear 30 interlocking with the large-diameter bevel gear 29 is located in the rear part of the main gear case 23, and the small-diameter spur gear 30 and the upper large-diameter spur gear 31 are located. And the lower blade 22 is driven to rotate. Further, at the rear part in the main gear case 23, the small-diameter spur gear 30 and the intermediate spur gear 33 mesh with each other, and further, the intermediate spur gear 33 and the lower large-diameter spur gear 32 mesh with each other so that the upper blade 21 becomes the lower blade 22. Reversely rotate.

As shown in FIG. 3 with reference to FIG. 2 (a), when the tip of the operating rod 3 is inserted into the short cylindrical portion 26 on the working device side and is fastened and fixed, the work is applied to the tip of the operating rod 3. Device 10 is installed. Along with this mounting, the power input portion 27b forming the rear end portion of the shaft 27a of the small-diameter bevel gear 27 and the tip portion 50a of the drive shaft 50 provided in the operating rod 3 are used for power transmission. The joint 40 is connected to be able to rotate.
A plurality of types of power transmission joints 40 are prepared in accordance with the various shapes of the power input portion 27b and the various shapes of the distal end portion 50a of the drive shaft 50. From these, the optimum power transmission joint 40 is selected and used.
The power input unit 27b shown in FIG. 3 is a hexagonal shaft, the tip 50a of the drive shaft 50 is a spline shaft, and detailed embodiments of the power transmission joint 40 for connecting them are shown in FIGS. d).

[Power Transmission Joint of First Embodiment]
4A is a perspective view of the power transmission joint according to the first embodiment as viewed obliquely from the front, FIG. 4B is a perspective view of the power transmission joint as viewed obliquely from the rear, FIG. 4C is a side sectional view, and FIG. FIG. 5A is a view illustrating the end face shape of the front side of the drive shaft, FIG. 5B is a view illustrating the end face shape of the rear side, and FIG. 6 illustrates the end face shape of the nesting. FIG.

  A power transmission joint 40 </ b> A according to the first embodiment shown in FIGS. 4A to 4C is a power transmission joint in which a main joint 41 and a nest 42 are combined. The nest 42 is disposed on the rear side of the main joint 41. It is immersed in the one side and turns with the main joint 41.

As shown in FIGS. 4A, 4B, and 4D, the main joint 41 has a hexagonal hole fitting portion 41a on one side located on the front side (output side) and the rear side (input). A fitting portion 41b in which a groove 41d in the vertical direction is formed, respectively, at a portion that divides the inner circumference of the other side of the other side into six equal parts. Both fitting parts 41a and 41b have substantially the same depth, and may be bottomed holes.
The nest 42 has a diameter that is substantially tightly immersed in the fitting portion 41b of the main joint 41, and a convex strip 42a that engages with the strip groove 41d is formed on the outer peripheral surface thereof, and the inside of the cylinder has a spline inner wall. The fitting hole 42b is used.
The end surface shape of the front end portion of the main joint 41 includes various end surface shapes illustrated in FIG. 5A, and the end surface shape of the rear end portion includes an end surface shape illustrated in FIG. 5B. is there. The nesting 42 also has an end face shape illustrated in FIG. That is, the main joint 41 is prepared in a shape combining the shape shown in FIG. 5A and the shape shown in FIG. 5B, and from these, the one suitable for the connection is selected and used.

The power transmission joint 40A is attached by selecting the main joint 41 that matches the shape of the power input portion 27b shown in FIG. 3, and replacing the front fitting portion 41a with the power input portion 27b shown in FIG. Start by inserting. Subsequently, a nest 42 having an inner wall shape that matches the shape of the tip 50a of the drive shaft 50 shown in FIG. 3 is selected from a plurality of types of nests, and this is used as a fitting portion on the rear side of the main joint 41. Immerse in 41b. Further, when the tip 50a of the drive shaft 50 is inserted into the insert 42, the power input portion 27b and the tip 50a of the drive shaft 50 can be connected via the power transmission joint 40A.

[Power Transmission Joint of Second Embodiment]
FIG. 7A is a perspective view of the power transmission joint according to the second embodiment as viewed obliquely from the front, and FIG. 7B is a perspective view of the power transmission joint as viewed obliquely from the rear.
The power transmission joint 40B of the second embodiment shown in FIGS. 7A and 7B is a power transmission joint in which a main joint 41 and a nest 42 are combined, and the nest 42 is a ring plate having the same end face shape. A plurality of 42n sheets are overlapped. The main joint 41 is the same as the main joint 41 shown in FIGS. The insert 42 on which the ring plates 42n are overlapped has the same shape as the insert 42 shown in FIGS. 4 (a), 4 (b), and 4 (c). There are a plurality of combinations of the shapes of the main joint 41 and the insert 42 as in the case of the power transmission joint of the first embodiment, and the insert 42 on which the ring plates 42n are stacked can be easily and inexpensively manufactured by press molding.

[Power Transmission Joint of Third Embodiment]
FIG. 8A is a side sectional view showing a state in which the distal end portion of the operating rod is connected to the power input portion on the working device side using the power transmission joint of the third embodiment, and FIG. FIG. 9 is an exploded perspective view of the power transmission joint according to the third embodiment, FIG. 10A is a side sectional view of the power transmission joint according to the third embodiment, and FIG. (C) is a right side view, (d) is a side sectional view of a main joint constituting a part of a power transmission joint according to the third embodiment, (e) is a left side view, and (f) is a right side view. FIG. 11 and FIG. 11 are views illustrating the end face shape of the shaft member.

The power transmission joint 40C according to the third embodiment shown in FIGS. 8A, 8B, 9 and 10A, 10B, and 10C has a power input portion 27b shown in FIG. It is a joint for power transmission corresponding to the case, and is constituted by a combination product of a main joint 41, two inserts 42 and 43, and a shaft member 44.
As shown in FIGS. 9 and 10 (e) to 10 (f), the main joint 41 is formed from a through hole in which a longitudinal groove 41d is respectively provided at a portion that divides the inner circumference of the cylinder into six equal parts. It has the fitting part 41b which becomes.
Each of the two inserts 42 and 43 has a diameter large enough to be immersed in the main joint 41, and on the outer peripheral surface thereof, convex strips 42a and 43a that engage with the strip groove 41d are formed. In addition, those provided with fitting holes 42b and 43b on the inner side are used, both of which are approximately half the length of the main joint 41, and all have various end face shapes shown in FIG. The The shaft member 44 is prepared in various shapes as shown in FIG.

The power transmission joint 40C according to this embodiment connects the power input portion 27b and the tip end portion 50a of the drive shaft 50 through the following procedure.
That is, as shown in FIG. 8B, the shaft member 44 that matches the shape of the power input portion 27b is selected, and the tip end portion of the shaft member 44 enters the power input portion 27b. Subsequently, the insert 43 having a fitting hole 43 b that matches the shape of the shaft member 44 is selected, and the insert 43 is inserted into the rear portion of the shaft member 44. Thereafter, when the front portion of the main joint is fitted into the insert 43, the power input portion 27b and the front portion of the main joint 41 are connected to be able to rotate.
Subsequently, the insert 42 having a fitting hole 42b that matches the shape of the tip 50a of the drive shaft 50 is selected, and the insert 42 is immersed in the rear part of the main joint 41. Finally, the tip of the drive shaft 50 When 50a is inserted into the insert 42, the connection operation is completed.

  According to the power transmission joint 40C according to this embodiment, when the main joint 41 is first attached to the power input portion 27b using the shaft member 44 and the front insert 43, the tip of the drive shaft 50 is thereafter used. It is only necessary to selectively use the rear nesting 42 that matches the shape of the portion 50a. For this reason, there exists an advantage which can perform the said connection simply and at low cost.

[Power Transmission Joint of Fourth Embodiment]
FIG. 12 is a side sectional view showing a state in which the distal end portion of the operating rod is connected to the power input portion on the working device side using the power transmission joint according to the fourth embodiment, and FIG. 13A is the fourth embodiment. The disassembled perspective view which looked at the joint for power transmission by a form from diagonally forward, (b) is the disassembled perspective view which looked from diagonally back.

Similar to the power transmission joint according to the third embodiment, the power transmission joint 40D according to the fourth embodiment shown in FIGS. 12 and 13 (a) (b) corresponds to the case where the power input portion 27b is a fitting hole. The power transmission joint is composed of a main joint 45 and a nest 42.
The main joint 45 has a front portion formed by a shaft portion 45a and a rear portion formed by a thick cylindrical portion 45b having a bottom, and a rear end face of the thick cylindrical portion 45b has a shape shown in FIG. .
A plurality of types of main joints 45 are prepared in which a shaft portion 45a having a shape shown in FIG. 11 and a fitting portion 45c having an end surface shape shown in FIG. 5 are combined. Further, the shaft portion 45a in addition to those formed integrally with the thick cylindrical portion 45b, (not shown) holes or blind hole the rear end portion was formed at the front end portion of the thick cylindrical portion 45b of the shaft portion 45a It is assumed that it is fixed inside.
The insert 42 is the same as the insert 42 shown in FIGS. 4 (a) and 4 (b) or the insert 42 shown in FIG. 7, and the end face shape shown in FIG. 6 is also prepared.

When the power input portion 27b shown in FIG. 12 and the tip end portion of the drive shaft 50 are connected by the power transmission joint 40D of this embodiment, the main joint 45 having the optimally shaped shaft portion 45a is selected. Then, the insert 42 that matches the shape of the distal end portion 50a of the drive shaft 50 is selected, and the shaft portion 45a of the selected main joint 45 is inserted into the power input portion 27b. Subsequently, when the selected insert 42 is immersed in the thick cylindrical portion 45b of the main joint 45, and finally the tip portion 50a of the drive shaft 50 is inserted into the insert 42, the power input portion 27b and the drive drive shaft 50 are inserted. Are connected by a power transmission joint 40D.

  In the power transmission joint 40D of this embodiment, if the shaft portion 45a of the main joint 45 is inserted into the power input portion 27b shown in FIG. 12 and the main joint 45 is attached to the power input portion 27b, the drive shaft The power input portion 27b and the tip portion 50a of the drive shaft 50 can be easily and inexpensively adapted to the shape of the tip portion 50a simply by selecting and using the insert 42 that matches the shape of the tip portion 50a. Connection with is possible.

  The power transmission joint of each of the embodiments described above is configured with a nesting, but the configuration in which the tip of the drive shaft is directly inserted into the main joint so as to be able to rotate and engage is not provided. It is also possible to do. According to this configuration, the main joint is provided with a fitting portion having various shapes corresponding to the shape type of the tip portion of the drive shaft.

It is the perspective view which illustrated one example of the hand-held power working machine by this invention, and the work apparatus replaceable. FIG. 2A is a side cross-sectional view illustrating the brush cutter and the operating rod tip, and FIG. 2B is a partial plan cross-sectional view inside the brush cutter. FIG. 3 is a side cross-sectional view showing the distal end portion of the operating rod connected to the power input portion on the working device side. (A) is a perspective view of the power transmission joint according to the first embodiment as viewed obliquely from the front, (b) is a perspective view as viewed from the oblique rear, (c) is a side sectional view, and (d) is a part thereof. It is side surface sectional drawing of the main joint which comprises. (A) is the figure which illustrated the end surface shape of the front part side of a drive shaft, (b) is the figure which illustrated the end surface shape of the rear part side. FIG. 6 is a diagram illustrating an end face shape of the insert. (A) is the perspective view which looked at the joint for power transmission of 2nd Embodiment from diagonally forward, (b) is the perspective view seen from diagonally back. (A) is side surface sectional drawing which showed the state which connected the front-end | tip part of the operating rod, and the power input part by the side of a working machine using the power transmission joint of 3rd Embodiment, (b) is this connection method. It is side surface sectional drawing shown. It is a disassembled perspective view of the joint for power transmission by 3rd Embodiment. (A) is side sectional drawing of the power transmission joint by 3rd Embodiment, (b) is a left view, (c) is a right view, (d) is a part of power transmission joint by 3rd Embodiment. The side sectional view of the main joint which constitutes, (e) is a left side view, (f) is a right side view. It is the figure which illustrated the end face shape of the shaft member. It is side surface sectional drawing which showed the state which connected the front-end | tip part of the operating rod, and the power input part by the side of a working device using the power transmission joint of 4th Embodiment. (A) is the disassembled perspective view which looked at the joint for power transmission of 4th Embodiment from diagonally forward, (b) is the disassembled perspective view which looked from diagonally back.

DESCRIPTION OF SYMBOLS 1 Hand-held power working machine 2 Operating rod with motor 3 Operating rod 10 Brush cutter 21 Upper blade 22 Lower blade 23 Main gear case 24 Main shaft 25 Rear gear case 26 Short cylindrical portion 27 Small diameter bevel gear 27b Power input portion 40 Power transmission joint 40A Power transmission joint 40B of the first embodiment Power transmission joint 40C of the second embodiment Power transmission joint 40D of the third embodiment Power transmission joint 41 of the fourth embodiment Main joint 41a Fitting portion 41b Fitting portion 41c fitting part 41d groove 42 nest 42a protrusion 42b spline fitting hole 42n ring plate 43 nest 43a protrusion 43b fitting hole 44 shaft member 45 main joint 45a shaft part 45b thick cylindrical part 45c fitting part 50 drive shaft 50a Tip

Claims (4)

A hollow pipe structure with a prime mover consisting of an engine or electric motor mounted at the rear, and a work device that inputs rotational power from the drive shaft and drives it at the tip of an operating rod equipped with a drive shaft inside Has a basic structure,
The working device can be replaced with a working device selected in accordance with the work purpose in addition to the brush cutter device,
Even if the tip portion of the drive shaft and the power input portion of the selected working device do not correspond,
On the rear side, it has a cylindrical fitting part consisting of any of spline inner wall, serration inner wall, square inner wall, and two-sided inner wall, and on the front side, spline shaft, serration shaft, square axis, two-chamfered shaft Among the plurality of types of power transmission joints having a shaft-like fitting portion, or a spline inner wall, a serration inner wall, a square inner wall, or a cylindrical fitting portion made of two chamfered inner walls, the rear side is the aforementioned to plunge the tip of the dry Bushafuto engaged to turns with it, and a power transmission joint front side is engagable turns with the power input of the selected working device is selected,
Through the selected power transmission joint, hand held power working machine, characterized in that the power input of the selected working device and distal portion of the drive shaft is configured to be coupled. A power transmission joint equipped in the hand-held power working machine according to claim 1,
It consists of a main joint and nesting,
The nesting has a fitting portion that engages the tip of the drive shaft at the center thereof so that the tip of the nesting can enter and rotate.
The main joint has a shaft portion or a cylindrical fitting portion that engages with a power input portion of the selected working device on the front side, and is immersed in a state in which the insert is in close contact with the rear side. A power transmission joint having a cylindrical fitting portion that can be rotated together . A longitudinal groove is formed on the inner circumferential surface of the fitting portion on the rear side of the main joint, and a convex groove that engages with the groove is formed on the outer circumferential surface of the insert.
The said main joint and the said nest | insert nested in the said fitting part of this main joint rear part side are comprised so that it may rotate with the engagement by the said groove and the said protruding item | line. The power transmission joint described. 4. The power transmission joint according to claim 2 , wherein the nest is configured by overlapping a plurality of ring plates. 5.

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