JPH0620907Y2 - Universal shaft coupling - Google Patents

Description

[Detailed Description of the Invention] [Field of Use and Outline of the Invention] The present invention relates to a universal shaft joint, in particular, a structure in which an input side joint portion and an output side joint portion are connected by an intermediate body made of a plate-like elastic material. The present invention relates to a universal shaft joint, and by improving the coupling structure between the intermediate body and the input / output side joint portion, it is possible to prevent the transmission accuracy from deteriorating even when transmitting with a torque larger than the conventional one. is there.

[Prior Art and its Problems] A so-called leaf spring type coupling of a type in which an input side joint portion and an output side joint portion are connected by an intermediate body made of a plate-like elastic material forms an angle between an input shaft and an output shaft. It is used when there is a gap.

This type of leaf spring type coupling is simplified and the input shaft and the output shaft, which are eccentric to each other in a staggered manner, can be transmitted. It has been known. In this conventional one, the input side joint main body (1a) and the output side joint main body (1b) configured in a tubular shape are provided with a pair of extension pieces (21) (21) from the end edge of the rectangular plate-like portion (20). )
And extension pieces (22) (22) are projected in mutually opposite directions, and the pair of extension pieces (21) (21) and the pair of extension pieces (22) (22) are mutually
Connected by the intermediate body (2) arranged in a staggered manner,
For this connection, the extension piece (21) (21) is one input side joint main body (1a), the other extension piece (22) (22) end edge is the other output side joint main body (1b) , Which are fixed to each other.

In this conventional one, while exhibiting sufficient rigidity for an acting force parallel to the plane of each part of the intermediate body (2), each extension piece can be bent in a direction perpendicular to the plane. The torque can be transmitted even when there is a step between the input side joint main body (1a) and the output side joint main body (1b). Further, due to the bending performance and the bending performance of the plate-shaped portion (20), even when the input side joint main body (1a) and the output side joint main body (1b) are in a crossing state at a slight angle, the torque is Can communicate.

However, this conventional device has a problem that high torque-high accuracy transmission cannot be performed.

This causes rattling at the joint between the extension piece (21) (21) and the input side joint main body (1a) and at the joint between the extension piece (22) (22) and the output side joint main body (1b). This is because it is easy, and the relative swing between the extension piece (21) or the extension piece (22) and each joint main body is likely to occur slightly.

The cause of this is in the joint structure mainly composed of the joints of the extension pieces (21) and (22), and in the conventional one, the bending tongue pieces (23) formed at the tips of the extension pieces (21) and (22) are used. (23) is clamped to the end face of each joint main body by a press plate (3) having a U-shaped cross section formed separately, and the outer surface of the press plate (3) is formed on the outer end face of the joint main body. This is because the caulking is stopped by (R) and (R). In other words, when crimping with ribs (R) (R),
A slight gap often occurs between the tip of the extension piece (21) (22) and the end face of each joint due to the springback of the holding plate (3), etc. A mismatch easily occurs between the rotation angle of the side joint main body (1a) and the rotation angle of the output side joint main body (1b). And, this is more remarkable in the high torque transmission state.

According to the present invention, the plate-shaped portion (20) is provided from the periphery of the plate-shaped portion (20) between the ring-shaped or tubular input-side joint main body (1a) and the output-side joint main body (1b). Through the intermediate body (2) consisting of a pair of extension pieces (21) (21) extending in the direction perpendicular to the plane of and a pair of extension pieces (22) (22) extending in the opposite direction. The end of the extension piece (21) (21) to the input side joint main body (1
a) near the outer end face of the outer joint, the tip of the extension piece (22) (22) is mounted near the outer end face of the output side joint main body (1b), and the intermediate body (2) is made of an elastic material, Extension piece (21)
It is an object of the present invention to enable high torque-high accuracy transmission in a universal shaft joint of a type in which (21) and extension pieces (22) and (22) are mutually offset by 90 degrees.

* Concerning the invention of claim 1 [Technical means] The technical means of the present invention taken to solve the above-mentioned problem is "to insert the edge (E) of each plate-shaped extension piece (21) (22). The end of the joint on the output side (1a) (1b) should be perpendicular to the axis, and the extension piece (2) should be placed inside the outer end face of the joint on the input / output side (1a) (1b).
1) While forming a contact surface (11) that contacts the edge of (22),
Inside the abutting surface (11), a mounting plane (12) with a constant width is formed parallel to the rotation axis, and the inner surface of the tip of each extension piece (21) (22) is in close contact with the mounting plane (12). Each extension piece (21) (2
Weld these extension pieces (21) (22) so that the edge (E) of the tip of 2) is in contact with the contact surface (11), and the tip of each extension piece (21) (22) and its vicinity A constant clearance between the inner surface and the body of the input / output side joint main body (1a) (1b) and between the plate-like part (20) and the inner end surface of the input / output side joint main body (1a) (1b) Has been established ”.

[Operation] The technical means of the present invention operates as follows.

The end edge (E) of the extension piece (21) (22) on the tip side is provided at a predetermined position of the input / output side joint main body (1a) (1b) and is formed at right angles to the axis line of the shaft joint. The contact surface (11).
In addition, the inner surface in the vicinity thereof is attached by welding to the attachment plane (12) following the contact surface (11) in the input / output side joint main body (1a) (1b) in a close contact state. Therefore, each extension piece
(21) (22) The input / output side joint main body (1a) (1b) is installed at an accurate angle, and the edge (E) and its vicinity are located on the input / output side in this accurate installation state. Mainly fitting (1
a) It is directly fixed to (1b) by welding.

As a result, the rotational torque from the input side joint main body (1a) is surely transmitted from the extension pieces (21) (21) to the plate-like portion (20) via this coupling portion, and from this, the extension piece (22) ( It is surely transmitted to the output side joint main body (1b) from the tip joint portion thereof via 22).

Here, the tip of the extension piece (21) (21) and the input side joint main body (1a)
The end portion (E) is connected to the abutting surface (11) of the input-side joint main body (1a) so as to be in contact with each other, and the other extension piece (22) (2)
Similarly, at the joint between the tip of (2) and the output side joint main body (1b), each edge (E) is connected in such a manner that it is in contact with each contact surface (11) of the output side joint main body (1b). ing. Therefore, swinging of the extension pieces (21) and (22) parallel to the mounting plane (12) causes the edge (E) and the contact surface (1).
It was blocked by contact with 1) and the extension piece (21)
It is possible to prevent the rotational angle misalignment between the input / output side joint main bodies (1a) and (1b) due to the swing of (22). Also, with the edge (E) and the contact surface (11) in contact with each other, the tips of the extension pieces (21) and (22) are welded or screwed and fixed in close contact with the mounting plane (12). Therefore, the bonding strength of this portion is also sufficient.

[Effects] The present invention having the above-described configuration has the following unique effects.

The torque is transmitted while the swinging parallel to the mounting plane (12) of each extension piece (21) (22) is reliably prevented, and moreover,
Since the tip ends of the extension pieces (21) and (22) are firmly fixed by welding or screwing in a state where they are in close contact with the mounting plane (12), high torque-high accuracy torque transmission is possible.

Further, since the presser plate (3) configured separately is not attached unlike the conventional case, the configuration of the entire shaft coupling is simplified.

* Concerning the invention of claim 2 The invention of claim 2 solves the same problem as the invention of claim 1 described above, and the tip of the intermediate body (2) (2) is fixed without welding. This is to ensure that they can be firmly fixed to the outer peripheral surface of the input / output side joint main body (1a) (1b).

Technical means for solving this problem, "a plurality of through holes at the tip of each plate-shaped extension piece (21) (22) to form through holes (24) (24) at regular intervals, The backing plate (4) having the tubular portions (41) and (41) densely inserted in the through holes (24) and (24) is contacted from the outside of the distal end portion of each extension piece, and the tubular portion ( 41) (41) is a concave part (25) formed on the flat surface of the outer periphery of the input / output side joint main body (1a) (1b)
Insert it tightly into (25) and insert the tip of each extension piece (21) (22) with the mounting screws (5) (5) that insert the cylindrical parts (41) (41).
It is screwed to the mounting part of the output side joint main body (1a) (1b) ”.

According to this technical means, the tubular portion (41) (41) and the through hole (24) (24)
Are closely fitted to each other, while the cylindrical portions (41) and (41) and the recessed portions (25) and (25) of the input / output side joint main bodies (1a) and (1b) are also closely fitted. Therefore, each extension piece (21) (22) and the input / output side joint main
(1a) (1b) There is no concern that the fixed part will move relative to each other, and the same action and effect as the means of the above-mentioned claim 1 can be exerted.

* Concerning the invention of claim 3 The invention of claim 3 solves the same problems as those of the inventions of claims 1 and 2, and further improves the torque transmission performance of the intermediate body (2) itself, thereby further increasing the torque. It is also an issue to make it possible to transmit the power transmission, and the technical means for this is to say, "In the universal joint of claim (1), input / output by plural intermediate bodies (2) (2) Main side fittings (1a) (1b)
The plate-shaped part (20) of these intermediates (2) (2)
Center the overlapping part (C) of (20) with the plate-shaped part (2
A pair of intermediates (2) (2) symmetrically arranged with respect to the center (C) of the overlapping part, with the center of the wall thickness of (0) or the center between the plate-like parts (20) (20) facing each other. The plate-shaped intermediate bodies (2), which are set to have the same shape, are inverted and overlapped, and the extension pieces (21) (21) and the extension pieces (22) (22) are placed in the plate thickness direction. They are laminated in close contact with each other so that the edges (E) and (E) coincide with each other. ”

[Operation] According to the above technical means, torque is transmitted from the input-side joint main body (1a) to the output-side joint main body (1b) through the plurality of intermediate bodies (2) and (2). Even if the plate thickness of the intermediate body (2) is set thin, sufficient torque can be transmitted. In other words, the intermediate
The transmission torque can be increased while improving the bending performance in the direction perpendicular to the plane of each part of (2).

Further, the intermediate bodies (2) and (2) having the plate-like portion (20) which is located at one side with respect to the center (C) of the overlapping portion are the length of the extension piece (21) and the extension piece (22). Is different from the length of. Therefore, in the torque transmission state, the extension pieces (21) (21) of each of these intermediate bodies (2)
And, the plate-shaped part (20) will have an asymmetrical bending or stress, but the intermediate body (2) (2) (where the plate-shaped part (20) is located biased with respect to the center (C) of the overlapping part. Since 2) are attached symmetrically to each other with respect to the center (C) of the overlapping portion in an inverted state, the asymmetrical deflection or stress as described above is canceled as a whole.

[Effect] Since the present invention has the above-mentioned structure, it has the following unique effect in addition to the effect of the first invention.

Since the transmission torque can be increased while improving the bending performance in the direction perpendicular to the plane of each part of the intermediate body (2), smooth transmission can be achieved when the transmission two shafts are in a stepped state or in a crossed state. And the transmission torque can be increased.

Since the imbalance of stress and strain generated in the multiple intermediate bodies (2) (2) in the superposed state is canceled, even if the intermediate bodies (2) (2) are superposed, The imbalance of stress and strain generated in the intermediate body (2) does not hinder the torque transmission.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The input / output side joint main bodies (1a) and (1b) of this embodiment both have the same configuration, and are configured as an annular body having a shaft insertion hole (10), and a certain range from the outer end surface thereof to the inner portion. The large diameter portion (13) has a larger diameter than that of the above, and a pair of parallel mounting planes (12) (12) are arranged around the large diameter portion (13).
Are formed. A collar portion (14) is projected to the outer edge of the mounting plane (12), and the inner surface of the collar portion (14) serves as the abutting surface (11) described above. Further, the mounting plane (12) is formed at a position recessed one step from the surface of the large diameter portion (13), and the shape of this recessed portion is the contour of the tip of the extension pieces (21) (22). Matched.

Incidentally, a screw hole penetrating in the radial direction is formed in the body portion of the input / output side joint main body (1a) (1b) of this embodiment, and the fixing bolts (16) (16) screwed into this are used for the above-mentioned. Shaft insertion hole (1
The axis (J) inserted in (0) is fixed.

Next, the intermediate body (2) is, as shown in FIG. 2, extended pieces (21) (21) and extended pieces (22) from the pair of opposite sides of the plate-shaped portion (20) having a substantially octagonal shape in the center. This is a configuration in which (22) are projected in mutually opposite directions. Mutual spacing between the extension pieces (21) (21) and extension pieces (22) (2)
The mutual spacing of 2) corresponds to the mutual spacing of the mounting plane (12) and the mounting plane (12) of the input / output side joint main body (1a) (1b). As shown in the figure, the planar shape of each extension piece (21) (22) is wider on the tip side, and the planar shape of this wide portion (23) is the planar shape of the above-mentioned mounting plane (12). Match the shape and the edge of the tip
(E) is configured parallel to the plane of the plate-like portion (20), that is, at a right angle to the axis of the input / output side joint main body (1a) (1b).

In this embodiment, the end (E) of the tip of the wide portion (23) is attached to the mounting plane (12) so as to be in contact with the contact surface (11), and the end (E) The contact surface (11) is joined by TIG welding or welding using a laser, and the whole is integrated.

Particularly, in this embodiment, the wide portions (23) (23) are extended pieces (21) (2).
Since the width is set to be wider than the other parts in 2), the bonding strength in this part will be high and each extension in the state where the edge (E) and the contact surface (11) are in contact with each other. The mounting accuracy of the pieces (21) (22) is improved.

When fixing the wide portions (23) and (23), fixing by screwing or caulking may be used together. In some cases, the fixing force by the screwing or crimping can be used as the main fixing force of this portion.

In this embodiment, when there is a step on the transmission two shafts,
As shown in FIG. 3, the extension pieces (21) (21) and the extension pieces (22) (2)
2) can be transmitted by curving at the part other than the mounting and fixing part with the input / output side joint main body (1a) (1b).

Next, when superimposing the intermediate bodies (2) and (2), they are made as shown in FIGS.

FIG. 4 shows a case where an odd number of intermediate bodies (2) and (2) are superposed, and in this case, the plate-like portions (20) (20) (20) ) Is located at the center of the plate thickness of the plate-like portion (20). Further, as shown in FIG. 5, when an even number of sheets are superposed, the center (C) of the superposed portion is the plate-shaped portion (2) at the central portion.
0) Located between the facing surfaces of (20).

In any of the above, the pair of intermediate bodies (2) and (2) having the plate-like portions (20) symmetrically positioned with respect to the center (C) of the overlapping portion are configured in the same shape as a whole. For example, the dimensions of each part of the intermediate body (2) in FIG. 6 are set as follows.

． One of the extension pieces (21) or one of the extension pieces (22)
(2a) The distance (W ₂ ) between the outer surfaces of (2a) is the same as the other second
Match the distance (W ₁ ) between the inner surfaces of the extension pieces (2b) (2b).

． The distance (L ₁ ) from the plane of the plate-like portion (20) on the first extension piece (2a) side to the edge (E) of the first extension piece (2a) is set to the distance of the second extension piece (2b) from the plane. Either match the distance (L ₂ ) to the edge (E) or set the distance (L ₁ ) slightly larger than the distance (L ₂ ).

As shown in FIG. 5, the first extension pieces (2a) (2a) of one of the intermediate bodies (2) are replaced by the other of the intermediate bodies (2) and (2) constructed as described above by reversing each other. When they are superposed so as to be positioned inside the second extension pieces (2b) (2b), a pair of intermediate bodies (2) and (2) are symmetrically arranged around the center (C) of the superposed portion. Edge (E)
(E) Mutual agreement.

When the distances (L ₁ ) and (L ₂ ) are matched, the plate portions (20) and (20) match each other in the case of FIG. 5, and the distance (L ₁ ) (L
₂ ) When a certain difference is given to each other, an interval twice as large as the above difference occurs.

When an odd number (three) of the intermediate bodies (2) and (2) are superposed as shown in FIG. 4, the shape of the central intermediate body (2) is such that the center of the plate thickness is the center of the superposed portion ( Form to match C).
The outer intermediate bodies (2) and (2) are inverted and overlapped with each other, and the plate-like portions (20) and (20) of the central intermediate body (2) are interposed between the plate-like portions (20) and (20). The distances (L ₁ ) and (L ₂ ) are set so that a gap corresponding to the thickness of) is generated. In addition, the interval (W ₁ ) (W
_{As for 2} ), the extension piece of the intermediate body (2) in the middle between the first extension piece (2a) and the second extension piece (2b) of these intermediate bodies (2) and (2) in a state of being inverted and superposed. (21) Set to a value that creates a gap corresponding to (22).

As a result, the edges (E) and (E) are aligned with each other, and the first and second extension pieces (2a) and (2b) are laminated in close contact to form extension pieces (21) and (22).

Even when the number of stacked layers is four or more, the dimensions of each part may be set in the same manner as in each of the above cases.

Incidentally, in the type in which the intermediate bodies (2) and (2) are simply laminated as described above, the first edge is formed in the state where the edges (E) and (E) are welded to each other.
Similar to the embodiment, the tip of each extension piece is fixed to a predetermined portion mainly composed of the joint by means such as welding.

Next, the second embodiment shown in FIGS. 7 and 8 corresponds to the invention of claim 2 described above, in which the distal end portions of the extension pieces (21) (22) are screwed to the input side joint. It is designed to be attached to the main body (1a) and the output side joint main body (1b). Then, in order to prevent relative movement between the joint main body of the screwed portion and the extension piece, a pair of through holes (24) and (24) are formed at the tip of the extension pieces (21) and (22). A pair of cylinders (4
A backing plate (4) equipped with (1) and (41) is attached to the tips of the extension pieces (21) and (22) from the outer surface thereof. The mounting portion of this extension piece is a mounting plane (12) as in the first embodiment, and the cylindrical portions (41) (41) are closely fitted into this mounting plane (12). A pair of recesses (25) (25) are formed.

Female screw portions (26) and (26) are formed in the center of the concave portion (25), and as shown in FIG. 7, the tubular portions (41) and (41) of the contact plate (4) and the extension piece ( 21) Fit the through holes (24) and (24) of (22) into the recess (2
When the through holes (24) and (24) are tightly fitted in the inside of 5) and then the mounting screws (5) are screwed into the female screw parts (26) and (26), the extension pieces (21) (22) ) Is fixed to the input / output side joint main body (1a) (1b).

In this fixed state, the pair of tubular portions (41) (41) are closely fitted in the through holes (24) (24) and the recessed portions (25) (25), so that the extension piece (21) ( 22) does not move relative to the joint body in this plane.

In this embodiment, the input side joint main body (1a) and the output side joint main body (1b) are projected from the inner side surface of the flange plate (F) and provided with the slit (S). And a tightening ring (18) that is fitted in a taper with this, and as shown in the figure, the tapered cylindrical portion (17) and the tightening ring
(18) is built in a space surrounded by a pair of extension pieces (21) (21). Then, a plurality of tightening bolts (6) (6) penetrating the flange plate (F) are screwed into the tightening ring (18).

Therefore, the length of the entire shaft joint in the axial direction does not become longer than necessary, and the universal joint function is provided.

[Brief description of drawings]

FIG. 1 is a sectional view of the first embodiment of the present invention, FIG. 2 is a perspective view of an intermediate body (2) used therein, FIG. 3 is an explanatory view of a stepped transmission state, and FIGS. 4 and 5 are Explanatory drawing of the main part of the second embodiment,
FIG. 6 is an explanatory view of an intermediate (2) used for this, FIGS. 7 and 8 are explanatory views of a second embodiment, and FIGS. 9 to 11 are explanatory views of a conventional example. , (1a) …… Mainly on the input side joint (1b) …… Mainly on the output side joint (20) …… Plate shaped part (21) (22) …… Extended piece (E) …… End edge (11) …… This Contact surface (12) …… Mounting plane (C) …… Center of overlapping part (24) …… Through hole (41) …… Cylinder part (25) …… Concave part (4) …… Abutting plate

Claims (1)

[Scope of utility model registration request] 1. Extends from the periphery of the plate-shaped part (20) at a right angle to the plane of the plate-shaped part (20) between the annular or cylindrical input-side joint main body (1a) and output-side joint main body (1b). The extension piece (21) (21) and the pair of extension pieces (22) (22) extended in the opposite direction to the intermediate piece (2) are interposed, and the extension piece (21 ) Attach the tip of (21) near the outer end surface of the input side joint main body (1a), and attach the tip of the extension pieces (22) and (22) near the outer end surface of the output side joint main body (1b). , The intermediate body (2) is made of an elastic material, and the extension piece (2
1) (21) and extension pieces (22) (22) are 90 degrees offset from each other, in a universal joint, the edge of each plate-shaped extension piece (21) (22)
(E) is an edge perpendicular to the axis of the input / output side joint main body (1a) (1b), and the extension piece ( 21) Abutment surface (1
1) and at the same time inside the abutting surface (11), a mounting plane (12) with a constant width parallel to the axis of rotation is formed.
1) The inner surface of the tip of (22) is in close contact with the mounting plane (12), and the edge (E) of the tip of each extension piece (21) (22) is the contact surface.
Weld these extension pieces (21) and (22) so that they are in contact with (11), and the tip of each extension piece (21) and (22) and the inner surface in the vicinity thereof and the input / output side joint main body (1a) (1b) A universal joint in which a fixed gap is provided between the body portion and between the plate-like portion (20) and the inner end faces of the input / output side joint main bodies (1a) (1b). ． Between the ring-shaped or tubular input-side joint main body (1a) and the output-side joint main body (1b), from the periphery of the plate-like portion (20) to this plate-like portion (20).
A pair of extension pieces (21) extending at right angles to the plane of
(21) and a pair of extension pieces (22) extended in the opposite direction
(22) via the intermediate (2) consisting of the extension piece (21)
Attach the tip of (21) near the outer end face of the input side joint main body (1a), and attach the tip of the extension pieces (22) (22) near the outer end face of the output side joint main body (1b). Said intermediate (2)
Is made of an elastic material, and the extension pieces (21) (21) and the extension pieces (22) (22) are offset by 90 degrees from each other, the plate-shaped extension pieces (21) A plurality of through holes (24) and (24) are formed at regular intervals at the tip of the (22), and the through holes (24) and (24) are provided with cylindrical portions (41) and (41) that are closely inserted. The abutting plate (4) is contacted from the outside of the tip of each extension piece, and the tube (41) (4
1) is closely fitted into the recessed portions (25) (25) formed in the flat surface of the outer periphery of the input / output side joint main body (1a) (1b), and the cylindrical portion (41) (4)
Each extension piece (21) (22) by the mounting screw (5) (5) which inserts 1)
Universal shaft joint in which the tip of is screwed to the input / output side joint (1a) (1b) mounting part. ． A structure in which the input / output side joint main bodies (1a) (1b) are connected by a plurality of intermediate bodies (2) (2), and these intermediate bodies (2) (2)
The center (C) of the overlapping part of the plate-like parts (20) (20) of the plate-like part (20) is located at the center of the thickness of the plate-like part (20) or the center between the facing surfaces And a pair of intermediate bodies (2) and (2) symmetrically arranged with respect to the center (C) of the overlapping portion are set to have the same shape. The extension pieces (21) and (21) and the extension pieces (22) and (22) are laminated in close contact with each other in the plate thickness direction so that the respective edges (E) and (E) are aligned with each other. The universal joint according to Item 1 or 2.