JPH0379815A - Constant velocity universal coupling - Google Patents

Abstract

PURPOSE:To make a coupling smaller by making a section polygonal, which is at right angles to the rotating shaft of a spherical part where the section passing a rotating shaft is approximately circular, and inserting the shaft provided with the spherical part into an output part and the spherical part into the recess part of a receiving body connected to an input shaft respectively to connect the input shaft and the output shaft with free angle of deflection. CONSTITUTION:The one end of a hexagonal shaft-shaped body 1 is made as a spherical part 3, and in the spherical part 3, the section which is at right angles to a rotating shaft is formed into a hexagon and the section in the direction of the rotating shaft is made approximately circular. The spherical part 3 is fitted into a recess part 6 where the inside of a cylindrical body 4 is formed into a hexagonal cylinder, and the cylindrical body 4 is fixed on an input shaft S1 to make it a coupling A. At an output shaft S2, a coupling B constructed in the same way as the above is provided, and the shaft-shaped bodies 1, 8 from both the couplings A, B are connected to a connecting member R with one side slidable. It is thus possible to provide transmission at a constant speed even if the input shaft S1 and the output shaft S2 are kept in the condition of free angle of deflection, making the outside diameter of the coupling smaller for reduction in size.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a constant velocity universal joint that connects an output shaft and an input shaft in a freely deflectable manner and transmits the rotation of the output shaft to the input shaft at a constant velocity. in between.

<Prior art> As a prior art of constant velocity universal joints, Japanese Patent Application Laid-Open No. 63-23
There is one described in Japanese Patent No. 027, that is, one shown in FIG.

This shaft joint is a constant-velocity rotatable shaft that transmits rotational torque by balls (52) held in a cage (5o) distributed around the periphery and guided in the same number of grooves in an inner joint member and an outer joint member (51). It is a joint.

In detail, the inner joint member (53) and the outer joint member (51
) are inclined parallel to and opposite to the axial direction by the same amount, and the cage (50) is axially inclined relative to both coupling members (51) (53). It can be slid in any direction. And Cage (50)
It is supported in the axial direction by one joint member via a spring (55), and can move in the axial direction within a sliding range with respect to the joint members (51) and (53), and the spring (55) is compressed. As a spring, it is preloaded over the entire sliding range.

<Problem to be solved by the invention> However, as shown in the figure, the above-mentioned universal joint has a complicated structure and a large number of parts, which leads to a large cost increase. . Moreover, it also has the disadvantage that the joint becomes larger, such as the shaft diameter becoming thicker.

The present invention has been made in view of the above problems, and aims to provide a constant velocity universal joint that has a simple structure, has a small number of parts, is inexpensive, and is compact.

<Means for Solving the Problems> The constant velocity universal joint of the present invention has a ring-shaped body connected to either the rotating member on the output shaft side or the rotating member on the input shaft side, and the rotating member on the output shaft side or and a receiver connected to the other rotating member on the input shaft side.

The annular body is provided with a spherical part, at the end on the receiver side, whose cross section perpendicular to the rotation axis is polygonal and whose cross section passing through the rotation axis is approximately circular.

On the other hand, the receiver has a recess at the end on the shaft-like body side, into which the spherical part is inserted, and this recess fits with the polygon of the spherical part, so that the rotation of the receiver and the shaft-like body is unified. The spherical part is supported rotatably in a direction in which the shaft-like body deviates from the receiving body.

Note that the shaft-like body and the receiver may be connected directly to the output shaft or the input shaft.

Function> A spherical portion having a polygonal cross section orthogonal to the rotation axis can transmit rotation to a recess provided to fit into the polygon. As a result, the rotation of the output shaft is transmitted to the input shaft.

On the other hand, when the output shaft and the input shaft are at an angle of deviation, the spherical part whose cross section passing through the rotating shaft is approximately circular can rotate in the direction of the deviation angle within the recess, so the output and input shafts can be freely moved. can be declinationed to.

In other words, even if the input shaft is deflected, the equidistant shaft joint can transmit the rotation of the output shaft to the input shaft at a constant speed.

<Embodiments> Preferred embodiments of the present invention will be described in detail below by way of example with reference to the drawings. However, the dimensions, shapes, materials, relative arrangements, etc. of the component parts described in this example are not intended to limit the scope of the invention to these unless specifically stated. , is merely an illustrative example.

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, FIG. 3 is a sectional view taken along YY in FIG. It is a ZZ sectional view of. In this embodiment, constant velocity universal joints (A) and (B) are arranged on the right and left halves of the figure, respectively, and are connected to each other via a connecting member (R).

Starting from the right hand side, the constant velocity universal joint (A) is a shaft-like body connected to the input shaft (S2) via another constant velocity universal joint (B) and a connecting member (R). (1) and a receiver (2) connected to an output shaft (Sl).

The annular body (1) is the axis of a regular hexagonal prism, and the spherical part (3), which has a spherical part (3) on the side of the receiver (2), is connected to the rotation axis as shown in FIG. The orthogonal cross section is hexagonal, and as shown in FIG. 1, the cross section passing through the rotation axis is approximately circular.

The receiver (2) consists of a cylindrical body (4) and a shaft fixing member (5). The shaft fixing member (5) has a spherical part (3
) is press-fitted into the cylindrical body (4). The cylindrical body (4) has a recess (6) formed into a hexagonal cylinder on the inside, and the spherical part (3) of the shaft-like body (1) is inserted into this recess (6). The spherical part (3) is fitted into the recess (6) to the point where the open end (6a) of the recess (6) exceeds the maximum diameter of the spherical part with a substantially circular cross section, and the four open ends (6a) ) has a slightly smaller inner diameter to prevent the spherical part (3) from being pulled out. Moreover, a coil spring (7) is arranged between the spherical part (3) and the shaft fixing member (5) in this recessed part (6), and the spherical part (3) is placed on the annular body (1) side. is energized. And spring (7)
This space where the oil is placed is a pool of oil.

The shaft fixing member (5) includes a press-fitting part (5a) formed into a hexagonal prism and press-fitted into the cylindrical body (4) in a non-rotatable manner, and a cylindrical part (4).
) and a head (5b) whose surface matches the circumferential surface of the output shaft (31).
) is provided with an insertion hole (5C) into which it is inserted. This insertion hole (5C) is provided with a vertical groove, and a rotation preventing member (5d) is fitted into this vertical groove. This rotation preventing member (5d) is a set screw (5e) that passes through the head (5b).
is pressed downward as shown in the figure. On the other hand, the output shaft (S
l) has a vertical groove into which the rotation prevention member (5d) is fitted.

That is, the output shaft (Sl) inserted into the insertion hole (5C)
This rotation prevention member (5d) prevents rotation and removal.

On the other hand, as described above, another constant velocity universal joint (B) is arranged on the left half of FIG. 1, and is connected to the shaft joint (A) by a connecting member (R).

The configuration of this shaft joint (B) is the same as the right-hand shaft joint (A).

The connecting member (R) has hexagonal insertion tube portions (R1
) (R2), and the shaft-shaped body (8) of the shaft coupling (B) is inserted into the insertion cylinder part (R1) and fixed with a pin (R3). The insertion cylinder part (R2) is the insertion cylinder part (R1)
It is formed longer, and the shaft-like part (] of the shaft joint (A)
) is slidably but non-rotatably inserted.

The constant velocity universal joint of this embodiment having the above configuration can be used even when the input shaft and the output shaft are deviated, eccentric, or both deviated and eccentric.

Furthermore, since the annular body (1) is slidably inserted into the connecting member (R), adjustment can be made even if the distance between the output shaft and the input shaft is far apart.

In this example, two shaft joints are connected, but if the output shaft and input shaft are only deviated, one of the constant velocity universal shaft joints (A) and (B) can be used. When used and connected to an output shaft and an input shaft, the output and input shafts are connected to rotate at a constant speed.

FIG. 4 is a sectional view showing the second embodiment.

This constant velocity universal joint consists of a ring-shaped body (0), which has spherical parts (9) GO) of the same shape as those in the previous embodiment at both ends, and a receiver 03, into which the spherical bodies (9) 00) are respectively inserted. ) 04).

The shaft-like body Q2) consists of a hexagonal column, and has a spherical part (9
) is integrally provided, and a spherical body (9)0ω is attached to the other end by press-fitting.The spherical body (9)0ω has a hexagonal cross section perpendicular to the rotation axis, and a cross section passing through the rotation axis. It is approximately circular.

The same receptor 03) 041 is used, and the description will be given by taking the right receptor t]3) as an example. 0 receptors are
The shaft fixing member 0 press-fitted into the cylindrical body 09 and the cylindrical body 05)
Consists of 0.

The cylindrical body 05) has a recess 117) formed into a hexagonal cylinder on the inside.
This recess 07) has a spherical part (9) of the annular body 021.
) into which the spherical part (9) is inserted is fitted into the recess 0'' 71 to the point where the open end (17a) of the recess exceeds the maximum diameter of the spherical part having a substantially circular cross section. The inner diameter of the portion (17a) is slightly smaller in order to prevent the spherical portion (9) from being pulled out.Also, the spherical portion (9) and the shaft fixing member 06) within this recess have zero force. A coil spring side is placed between them, and urges the spherical part (9) in the direction of the shaft-like body (121).The space where this spring 08 is placed is an oil pool. Even if the distance between the input and output shafts changes somewhat, the spring 08) can accommodate this by moving the spherical portion (9).It enables length correction.

The shaft fixing member 06) includes an insertion member (191) provided with an insertion hole (19e) in the center of which the output shaft (S3) is inserted;
It consists of detachable collars Q and I fitted into the insertion member 09 and a fixed ball Qυ21) that fixes the output shaft.

The insertion member Q9) has a hexagonal press-fitting part (19) on the left half.
a), and has a head (19b) at the right end.

The press-fitting portion (19a) is press-fitted into zero cylindrical bodies. In addition, the press-fit part (19a) has through holes (19C) in two places, upper and lower.
(19c), and this through hole (19c) (19c
) has a concave groove (I,
) Fixed ball C that fits! DOυ is fitted.

The bottom of the through hole (19c) is formed to be slightly narrow,
The fixed ball Qυ is designed so that it does not fall into the insertion hole (19e).

The detachable collar I2I is attached to the press-fitting part (19a) of the insertion member 09).
) and the head (19b), and is biased toward the head (19b) by a coil spring (to). That is, the detachable collar 120 is normally inserted into the insertion member 0.
9 is located toward the head (19b), but the press-fitting part (19a
) (to the left in the drawing).The inner circumferential surface of the detachable collar 12I is provided with a circumferential groove (20a).
is provided, and the detachable collar 121 is inserted into a press-fitting part (19a
), the through hole (19) of the insertion member 09)
c) It is now consistent with (19c).

That is, due to this coincidence, the fixed ball QυQυ is in the circumferential groove (20
In this state, the output shaft (
S3) can be removed. In addition, output and input shaft (53)
(34) has a rotation prevention groove (M) in the axial direction as shown in FIG. 5, and the rotation prevention member (19d) shown in FIG.
) is fitted to prevent rotation.

The second embodiment having the above configuration can deal with the declination and eccentricity of the output shaft and the input shaft, and can transmit rotation at a constant speed.

Fig. 7 is a cross-sectional view of the main part showing the third embodiment, and Fig. 8 is a cross-sectional view of the main part showing the third embodiment.
It is a sectional view taken along line XX in the figure.

This constant velocity universal joint consists of a shaft-like body (121) provided with a spherical part (9) 0ω at both ends, and a receiver (to) into which a spherical part (9) 00) is inserted, respectively. . The shaft-like body zero force is the same as in the second embodiment, so its explanation will be omitted.

On the other hand, the receptors (to) and (to) are also the same, and will be explained using the left receptor as an example. The receiver (2) includes a shaft fixing member (S3) that fixes the output shaft (S3) having the same shape as the second embodiment;
It consists of a removable collar 〇 fitted into the shaft fixing member (S3) and a fixed ball at+ (2υ) that fixes the output shaft (S3).

The shaft fixing member (24a) has an insertion hole (24a) in the left half into which the output shaft (S3) is inserted, and two through holes (24b) are provided on the peripheral wall of this insertion hole (24a). It is perforated. This through hole (24b) (24b) has a second
A fixed ball anaυ is arranged as in the embodiment shown in the figure.

And, on the right hand side of the shaft fixing member, there is a shaft-shaped body (+21
A recess into which the spherical part (9) is inserted is provided.

This concave portion is formed in a dome shape along the outer shape of the spherical portion (9). Inside the recess, there is a bearing ball (
5)...(5) is arranged.

The bearing ball (5)...or a part of the outside is fitted into the groove (25a)...(25a) provided on the inner circumferential surface of the recess, so that it rotates integrally with the recess. It is supposed to be done. In this embodiment, as shown in FIG.
a)...(9a) is brought into contact with it. Moreover, as shown in FIG. 7, the spherical part (9) is prevented from being pulled out by being arranged so as to sandwich the maximum diameter part of the spherical part (9).

That is, this bearing ball (5)...knot supports the spherical part (9) against the receiver (rotation) so that it cannot rotate in the direction of rotation of the receiver, but the rotation axis of the receiver This bearing ball □□□ (5) serves to smoothly rotate the ring-shaped body in the direction in which the zero force is deflected.
■ is pressed by the fitting member (to),
It is fixed in the recessed container. Since the bearing ball and retainer can slightly move the spherical portion in the axial direction, the length correction described in the second embodiment is possible.

On the other hand, detachable color 〇! Φ is fitted into the shaft fixing member (S3) and slides to fix and attach/detach the output shaft (S3), but its configuration is the same as that of the second embodiment, so it will not be described here. A detailed explanation will be omitted.

More than! A third embodiment with an input/output shaft (S
3) It can be used when (S4) is deviated or eccentric, and rotation can be transmitted at a constant speed. Since the spherical part is inserted into the receiver via the bearing ball, there is less friction and the above-mentioned constant velocity transmission motion becomes even smoother.

That is, this embodiment is more suitable for shafts rotating at high speed than the first to third embodiments.

FIG. 9 is a sectional view of the fourth embodiment, and FIG. 10 is a cross-sectional view of the fourth embodiment.
-X sectional view and FIG. 11 are right side views of the same embodiment.

This constant velocity universal joint has a shaft-like body a' with spherical parts (91Go) at both ends! J and spherical part (9) (till)
are inserted into the receptor (1)-, the receptor (2) and the receptor (
It consists of a coil spring (b) that connects the (to). The annular body 02) used is almost the same as in the second and third embodiments, but the spherical part (9) 0ω has a circular cross section passing through the axis up to its tip. It is provided.

The receiver (1) consists of a cylindrical body (2) and a shaft fixing member (1) press-fitted into the cylindrical body (2). The cylindrical body Oυ has a recess (33a) formed into a hexagonal cylinder on the inside, and the four parts (33a)
3a), a shaft-shaped body (+21 spherical part (9)) is inserted about three-fifths of the way in each. Also, an oil-impregnated felt (G) is inserted into this recess (33a).

The shaft fixing member (to) consists of a press-fitting part (to) shaped like a hexagonal prism and press-fitted into the cylindrical body clD, and a head (b) shaped like a cylinder. ) is a hexagonal cylinder-shaped insertion hole (to) into which an input/output shaft (not shown) is inserted.
The shaft inserted into this insertion hole (end) is fixed with a set screw (end) passing through the head (b).

On the other hand, the coil spring (b) is connected to the cylindrical body (2) of the receiver.
(Company) It is fixed by screwing into a screw provided on the circumferential surface, and connects the receiver (to) and the receiver (to) so as to freely deviate. The elasticity of the coil spring (9) biases the receivers in a direction that attracts them to each other. That is, due to this bias, the spherical part (9) αω is attached to the receptor cIla
The state of insertion into a is maintained.

This coil spring (A) also serves as a length correction.

This embodiment having the above-described configuration can also deal with the declination and eccentricity of the output and input shafts, and can transmit the rotation of the shaft at a constant speed.

Moreover, since oil-impregnated felt is used, there is no need for oiling.

In the embodiment, the cross section of the spherical portion perpendicular to the axis of rotation is hexagonal, but it may also be hexagonal or a gear-shaped polygon.

Further, if the annular bodies of the third and fourth embodiments are made short enough to join the spherical parts, the shaft joint can be made more compact. Then, make this ring shaped into a thin shape,
If it is designed so that it will break when more rotational torque than necessary is applied, the above-mentioned shaft joint can also serve as a torque limiter.

<Effects of the Invention> As described above, the constant velocity universal joint of the present invention includes a spherical portion whose cross section perpendicular to the rotating shaft is polygonal and whose cross section passing through the rotating shaft is approximately circular, and a recessed portion that receives the spherical portion. succeeded in inventing a constant velocity universal shaft joint using

This shaft joint has significantly fewer parts than conventional joints, and can significantly reduce manufacturing costs. Since this shaft joint has a small maximum outer diameter, is compact, and is lightweight, it has a wide range of uses as a shaft joint for various machines, and has extremely great practical value.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first embodiment of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, FIG. 3 is a sectional view taken along YY in FIG. 5 is a front view of the input shaft of the same embodiment, FIG. 6 is a view taken along the line X-X in FIG. 4, and FIG. 7 is a sectional view showing the third embodiment. 8 is a cross-sectional view taken along line XX in FIG. 7, FIG. 9 is a cross-sectional view of the fourth embodiment, FIG. 10 is a cross-sectional view taken along line X-X in FIG. 9, and FIG. 12 is a sectional view showing a conventional constant velocity universal joint, and FIG. 13 is a sectional view taken along line 2-2 in FIG. 1.

Claims (1)

[Claims] In a constant velocity universal joint that connects an output shaft and an input shaft in a freely deflectable manner and transmits the rotation of the output shaft to the input shaft at a constant velocity, the rotating member on the output shaft side or the rotating member on the input shaft side It consists of a shaft-like body connected to one end, and a receiver connected to the other of the rotating member on the output shaft side or the rotating member on the input shaft side. Orthogonal cross sections are polygons,
The receiver includes a spherical portion whose cross section passing through the rotational axis is approximately circular, and the receiver includes a recess into which the spherical portion is inserted at the end on the shaft-like body side, and the recess fits into the polygon of the spherical portion. This means that the receiving body and the shaft-like body are provided so that they can rotate together, and that the shaft-like body supports this spherical part so as to be rotatable in the direction in which the shaft-like body is deflected with respect to the receiving body. Unique constant velocity universal joint.