JPH01320323A - Constant velocity universal shaft coupling - Google Patents

Abstract

PURPOSE:To make possible of lowering cost and to make good of constancy in speed by making a power transmitting position from a drive shaft to a driven shaft always exist on a plane of symmetry for a rotation center of the drive shaft and a rotation center of the driven shaft. CONSTITUTION:A power transmitting position from a drive shaft 2 to a driven shaft 4 always exists on a plane of symmetry for a rotation center 2' of a drive shaft and a rotation center 4' of a driven shaft. A first arm 10a and a second arm 12a are arranged respectively along cylindrical faces making rotation centers 2', 4' of the drive shaft 2 and the driven shaft 4 as the centers respectively. A stopper 10a' for keeping said arrangement against centrifugal force following to rotation of the drive shaft 2 and the driven shaft 4, is provided. In such way, few portions need high accuracy processing, therefore lowerizing cost becomes possible and constancy in speed can be made in good.

Description

[Detailed description of the invention] [Industrial use! ? ] The present invention relates to constant velocity universal shaft joints, and particularly reduces costs.
'T tF constant velocity universal joint.

[Prior art and problems to be solved by the invention] Conventionally,
For free shaft rotation, the driving shaft and driven shaft are at an angle (Jt1 hand angle)
It is widely used in various rotary drive power transmission lfS mechanisms. A typical example of such a joint is a so-called hook-type flexible shaft assembly.

However, with the hook-type JtIF, as the joint angle increases, the inconsistency of rotational force transmission gradually increases, the rotational force transmission becomes less smooth, and as the rotational speed increases, it generates vibration and noise. There is.

Therefore, a constant velocity universal joint is used, which does not exhibit inconsistency even when the joint angle becomes large.

The so-called Parfield type is a typical example of the constant velocity adjustable shaft assembly. There is a 1st floor. This af- is.

To attach a member having a plurality of three-dimensionally curved grooves to the tips of the driving shaft and driven shaft, a pole is interposed between the groove of the driving shaft side member and the groove of the driven shaft side member, and the pole is attached to the cage. It is used to place it in a predetermined position.

However, this constant velocity freely adjustable shaft! IF has the disadvantage that the pole groove is complicated and requires high-precision machining, resulting in high cost.

Therefore, in view of the problems of the prior art described in L, the object of the present invention is to provide a constant-velocity universal shaft joint that can be cost-reduced and has good constant-velocity properties.

[L stage for solving the problem] According to the present invention, the following object is to enable relative movement between the driving shaft end and the driven shaft end so that the rotation center of each shaft always intersects at one point. One end of the first arm is connected to the outer periphery of the driving shaft end by a spherical joint, and the other end of the first arm is connected to the outer periphery of the driven shaft end by a spherical joint. At least one coupling unit is provided in which the second arm is coupled at one end to the XA section, and in each unit, the first arm and the second arm are mirror-symmetric. A constant velocity universal joint, characterized in that the first arms of all units are identical and the second arms of all units are identical.

In the constant velocity universal joint of the present invention, the first arm and the second arm are arranged along a cylindrical surface centered on the rotation center of the driving shaft and the driven shaft, respectively, and Means may be provided for maintaining said configuration against the attendant centrifugal forces.

In addition, in the constant velocity universal joint of the present invention, a four-spherical joint is used for the universal joints i- and p whose rotating parts are relative motions in which the center of rotation of the driving shaft and the center of rotation of the driven shaft always intersect at one point. It is also possible to use a joint p consisting of an inconstant velocity universal joint and a radial dovetail knob between the mf and the end of the driving shaft and/or the end of the driven shaft.

[Embodiments] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic partial sectional view showing an embodiment of a constant velocity universal joint according to the present invention, and FIG. 2 is a sectional view taken along line H-II.

In these figures, 2 is the driving shaft and 2' is its center of rotation. Further, 4 is a driven shaft, and 4' is its rotation center. The driving shaft 2 and the driven shaft 4 are arranged such that one end thereof faces each other and their angular rotation centers 2' and 4' coincide with each other.

The end of the driving shaft 2 and the end of the driven shaft 4 are spherical i, :r-
6. That is, 6-1 is a pole constituting the spherical joint, and this pole is attached to the end of the driven shaft 4 with a screw 6-2 and a spacer 6-3.

The center of the pole is located at the driven shaft rotation center 4'-L. - The force test pole 6-1 is attached to the end of the driving shaft 2 by a holder 6-4 and a spacer 6-5. As a result, the driving shaft rotation center 2' and the driven shaft rotation center 4' are set so as to always intersect at one point, and the distance between the driving shaft 2 and the driven shaft 4 is set.

FIG. 3 is a view of IE with the L spherical joint L6 removed, looking at the driving shaft side in the direction of the driving shaft rotation center.

As shown in FIG. 3, the end of the driving shaft 2 has spherical surfaces J1f=8a, 8b, respectively, at positions dividing the driving shaft circumferential direction into three equal parts.
, 8c via the first arm 10a.

One end of job 10c is connected. That is, 8a
-1 is a pole constituting the spherical joint 8a, and this pole is attached to the rear arm 10a by a pin 8a-2. On the other hand, a pole holder 8a-3 is formed on the outer periphery of the end of the driving shaft 2 and has a cylindrical shape in the direction of the driving shaft rotation center 2' and is moderately open on the outside. 8a-1 is accommodated. In addition, the pole holder 8a
-3 is regulated on both sides by the above-mentioned pole holder 6-4 and holding member 11, and thereby the pole 8a-1 is held in a predetermined position.0 Spherical joints 8b and 8c are also similar to spherical joint p8a. .

As shown in FIGS. 1 and 3, the arm loa extends along a cylindrical surface centered on the driving shaft rotation center 2'. The same applies to arms 10b and foe. The first arm of these three is the gyrus.

Also, a second arm 12 on the driven shaft side that is equivalent to the driving shaft side is provided.
a, 12b, and 12c (not shown) are arranged at positions corresponding to the first arms loa, fob, and 10c, respectively. These corresponding first and second arms are coupled by hinges 14a, 14b, 14c (not shown) to form a coupling unit. As shown in FIG. 1, the first arm loa and the second arm 12a are arranged mirror-symmetrically, and the same holds true for the other coupling units.

Note that the second arms 12a, 12b, 12 on the driven shaft side
c are connected to the ends of the driven shaft 4 by spherical joints 16a, 16b (not shown) and 1ee (not shown), respectively.

As shown in No. 314, spherical joint r' of arm loa,
The end on the side 8a is bent inward and opposed to the outer peripheral surface of the end of the driving shaft 2 to form a stopper 10a'. The same applies to the other first arms, and the second arm also has the same configuration. The stopper is connected to the driving shaft 2.
As the driven shaft 4 rotates, each arm is moved to the driving shaft rotation center 2 against the centrifugal force acting on the hinge joint side of each arm.
' or a cylindrical surface centered on the driven shaft rotation center 4'.

Note that 18 is a cover attached to the end of the driven shaft 4.

Next, in this embodiment as described above, the driving shaft rotation center 2
A case where the rotation center 4' and the driven shaft rotation center 4' are tilted will be explained.

FIG. 4 is a schematic diagram for explaining the operation of this embodiment in this case.

In Figure 0'S4, the center of the spherical joints 8a to 8c (one of these spherical joints f- is indicated by 8 in Figure 4) is perpendicular to the rotation center 2' of the driving shaft 2. The center of two spherical joints 16a-16c (one of these spherical joints is shown at 16 in FIG. 4) is located at the center of rotation 4' of the driven shaft 4. 7 planes 22 including the plane are tilted by an angle of 0. As the driving shaft 2 rotates, its rotational force is applied to the spherical joints 8a to 8c, respectively.

Arms loa-10c (one of these arms is designated 10 in FIG. 4).

Arms 12a-12c (one arm of these is designated 12 in FIG. 4), and spherical joint tea-16c (in FIG. 4).

A spherical joint for one of these is shown at 16)
is transmitted to the driven shaft 4 via the
rotate around. With this rotation, the 1-th spherical joint 16 rotates within the t-thread surface 22 around the rotation center 4'.

In FIG. 4, A shows the state where the distance between the spherical joint lO on the driving shaft side and the spherical joint j12 on the driven shaft side is at the farthest position, and B shows the state where the distance between the spherical joint 10 on the driving shaft side and the spherical joint j12 on the driven shaft side is the farthest position. Joint 12 indicates which distance is the closest position, C,
As can be seen from Figure 1, which shows the state in which the distance between the spherical surface JItf-10 on the driving shaft side and the spherical joint 12 on the driven shaft side is at an intermediate position, D indicates that the paired arms 10 and 12 are equivalent. , In each state, due to symmetry, the hinge 14 always exists in the f-plane 24 l2, which is intermediate between the above-mentioned 20 and the L-plane 22.

Although four representative states have been described in FIG. 4, the same applies to other states.

Furthermore, even when the joint angle 0 changes continuously, the above explanation holds true at each instant.

In this way, according to this embodiment, p! X driving axis 2 and driven axis 4
The condition of an equi-coupled joint is satisfied that the power transmission position between the two is always on the plane of symmetry between the driving shaft rotation center 2' and the driven shaft rotation center 4' (ie, the plane 24).

Further, according to one embodiment, the first arms 10a to lOC
and second arms 12a to 12c are arranged along cylindrical surfaces centered on the rotation centers 2' and 4' of the driving shaft and driven shaft, respectively, and the eleven arms rotate as the driving shaft 2 and the driven shaft 4 rotate. Since it has a stopper (such as loa') for maintaining the arrangement against centrifugal force, the device can be made more compact.

■- In the embodiment described above, an example is shown in which there are three coupling units each including a first arm and a second arm. However, in the present invention, the number of the coupling units may be one or two, and of course, there may be four or more. When using a plurality of coupling units, the number of coupling units may be equal to each other in the circumferential direction. It is preferable to place the

FIG. 5 is a schematic partial sectional view showing an embodiment of the constant velocity universal joint according to the present invention, and shows a portion corresponding to FIG. In FIG. 5, the same members as in FIGS. 1-2 are given the same reference numerals.

In this embodiment, the driving shaft rotation center 2' and the driven shaft rotation center 4 are
′ and 11 points, and instead of the spherical surface jlP6 in the embodiment shown in FIG. In other words, a rod 30 is attached to the end of the driving shaft 2, and a rod 32 is attached to the end of the driven shaft 4.

Here, while the rod 30 is fixed, the rod 32 is attached to the driven shaft rotation center 4 by a radial bearing 34.
It is said that it can be rotated freely around '.

The distal end of the rod 30 and the distal end of the rod 32 are connected by a universal joint 36. A hook type universal joint can be used as the joint 36.

This embodiment also provides the same effects as the embodiments shown in FIGS. 1 to 4 above.

The constant velocity universal joint of the present invention as described above can be used, for example, in a driving force transmission system of an automobile.

[Effects of the Invention] The constant velocity universal joint of the present invention as described above has fewer parts that require high-precision machining, so it is possible to reduce costs by i'+7.
It also has good uniform velocity.

[Brief explanation of the drawing]

Fig. 1 is a schematic partial cross-sectional view showing a constant velocity universal joint according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■, and Fig. 3 is a side view of the driving shaft in the direction of the rotation center of the driving shaft. This is a diagram showing the. FIG. 4 is a schematic diagram for explaining the operation of the constant velocity universal joint according to the present invention. FIG. 5 is a schematic partial sectional view showing a constant velocity universal joint according to the present invention. 2: Driving shaft, 2': Driving shaft rotation center, 4: Driven shaft,
4': Driven shaft rotation center, 6: Spherical surface [. 8.8a to 8C: Spherical joint, 10, loa to loc: Arm. 12.12a-12c: Arm. 14.14a to 14c: elbow 7, 16, lea N16c: spherical joint f. 34: Bearing. 36: Free axis ar=. Figure 2 Figure 4 Figure 5

Claims (4)

[Claims] (1) The end of the driving shaft and the end of the driven shaft are connected by a universal joint that allows relative movement in which the rotation centers of each shaft always intersect at one point, and a spherical joint is attached to the outer periphery of the end of the driving shaft. A coupling unit is provided in which the other end of a first arm whose one end is connected to the outer periphery of the driven shaft end is coupled to the other end of a second arm whose one end is connected to the outer periphery of the driven shaft end by a spherical joint. At least one arm is provided in each unit, and the first arm and the second arm in each unit are arranged mirror-symmetrically, and furthermore, the first arm of all units is equal, and the second arm of all units is A constant velocity universal joint, characterized in that the arms are the same. (2) The first arm and the second arm are arranged along a cylindrical surface centered on the rotation center of the driving shaft and the driven shaft, respectively, and resist centrifugal force caused by the rotation of the driving shaft and the driven shaft. 2. A constant velocity universal joint according to claim 1, further comprising means for maintaining said position. (3) The center of rotation of the driving shaft and the center of rotation of the driven shaft are always 1
3. The constant velocity universal joint according to claim 1, wherein the universal joint that enables relative motions that intersect at a point is a spherical joint. (4) The center of rotation of the driving shaft and the center of rotation of the driven shaft are always set at 1
Claim 1 or 2, wherein the universal joint that allows relative motion to intersect at a point comprises an inconstant velocity universal joint and a radial bearing between the joint and the end of the driving shaft and/or the end of the driven shaft. constant velocity universal joint.