JPH0134979Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a constant velocity joint, and is particularly characterized by having two or more connecting pieces.

(Prior Art) Where there is a misalignment between the input shaft and the output shaft, that portion of the input shaft and output shaft is connected by a joint.

In this case, the joint is required to always accurately transmit the rotation of the input shaft to the output shaft at a constant speed even if the amount of misalignment between the input shaft and the output shaft changes. As such a joint, the present inventor invented a constant velocity joint and has already filed an application (Japanese Patent Laid-Open No. 116923/1983). This device consists of a pair of rotating wheels (driving wheel and driven wheel) and a connecting piece narrowed between them.The rotating center of the connecting piece is always located in the center of the rotation centers of both rotating shafts, and the rotation of the driving wheel is controlled by the connecting piece. The rotation of the connecting piece is transmitted to the driven wheel. To explain this more specifically, numeral 1 is a driving wheel, 2 is a linking piece, and 3 is a driven wheel.

Engagement grooves 4 and 5 are formed on the linking piece 2 on a line passing through its center of rotation, while an input pin 6 is provided protruding from the driving wheel 1, and an output pin is provided on the driven wheel 2. 7 is provided protrudingly. The linking piece 2 is supported such that its center of rotation is always located in the center between the center of rotation of the drive wheel 1 and the center of rotation of the driven wheel 3, and the input pin 6 is fitted into the engagement groove 4. The rotational force of the drive wheel 1 is transmitted to the connecting piece 2 via the input pin 6, and the output pin 7 is fitted into the engaging groove 5, so that the rotation of the connecting piece 2 is transmitted through the engaging groove 5. and is transmitted to the driven wheels 3. Figure 6 shows the above-mentioned drive wheel 1 and linkage piece 2.
and the positional relationship with the driven wheels 3 is schematically shown. That is, in the figure, the driving wheel 1 rotates around point a, the driven wheel 3 rotates around point c, and the linking piece 2 rotates around the center of both (point b).
Now, the drive wheel 1 rotates by α degrees, and the input pin 6
If it turns from 6P to 6Q, the engagement groove 4 is pushed by the input pin 6 from 4P to 4Q, and the connecting piece 2 rotates by β degrees. Then, the other engagement groove 4 of the linking piece 2 moves by β degrees from 5P to 5Q, which pushes the output pin 7 and eventually rotates the driven wheel 3 by γ degrees around point c. Become.

Here, the rotation radius (a-6Q) of the drive wheel 1 and the rotation radius (c-7Q) of the output pin 7 are set to be the same, and the rotation center b of the connecting piece 2 is the rotation center a of the drive wheel 1 and the rotation radius of the output pin 7 (c-7Q). Since it is set at the center of the rotation center c of the driving wheel 3, Δab6Q and Δcb7Q are congruent in the figure. Therefore, ∠α=∠γ. That is, the driving wheel 1 and the driven wheel 3 always rotate at the same speed.

As mentioned above, the conventional constant velocity joint can transmit the rotation of the driving wheel 1 to the driven wheel 3 at a constant speed, and its function can change depending on the size of the deviation between the rotation centers of the two. Therefore, it is extremely useful because it can be used in areas where the amount of misalignment constantly changes. However, on the other hand, since the rotational force transmission point (input pin) is at one point, the rotational torque of the drive wheels may be biased. Because of this, it was not possible to transmit strong rotational force or high-speed rotation.

The present invention solves the above-mentioned problems of the conventional constant velocity joint, and has two or more transmission points for the rotational force of the driving wheel and the driven wheel, and also connects these points to the respective centers of rotation. They are arranged at equal radial intervals around the center, thereby reducing the transmission force at each transmission point and making it possible to smoothly transmit the rotational force by converting the rotational torque into a corner force.

Hereinafter, the present invention will be specifically explained based on the illustrated embodiments.

In FIG. 1, reference numeral 11 is a driving wheel; 12 is a driving wheel;
is a driven wheel, and 13 and 14 are connecting pieces. These are basically the same as the conventional ones described above except that there are two linked pieces, and the linked pieces 13 and 1.
4 are arranged so that their rotation centers are located between the rotation centers of the driving wheel 11 and the driven wheel 12, and the rotational force of the driving wheel 11 is transferred to the driven wheel 12.
Acts as an intermediary to convey information.

That is, one point on the center line of the driving wheel 11 and the driven wheel 1
A freely rotating engagement rod 16 is attached between this and a corresponding point of 2, and the engagement rod 1
A pivot 17 is attached to the center of 6,
A tubular support shaft 18 is fitted into this, and the connecting pieces 13 and 14 are further fitted into the support shaft 18. Two input pins 19a and 19b are protruded from the driving wheel 11, and two output pins 20a and 20b are protruded from the driven wheel 12 symmetrically across the center line. On the other hand, a pair of engagement grooves 21 and 22 are formed in a straight line on both sides of the center line in the connecting piece 13, and the input pin 19a is fitted into the engagement groove 21, and the engagement groove 22 is inserted into the engagement groove 21.
The output pin 20a is fitted into the connecting piece 14, and engagement grooves 23 and 24 are formed in the connecting piece 14. Similarly to the above, the input pin 19b is fitted into the engagement groove 23, and the output pin 20a is fitted into the engagement groove 24. The pin 20b is fitted. By the way, the connecting piece 13 and the connecting piece 14 rotate independently of each other, but in the figure, the connecting piece 13 has the engaging groove 21 side fixed to one end of the support shaft 18, and the engaging groove 22 side to the other end. An example is shown in which the connecting piece 14 is fixed to the end and fitted onto the support shaft 18. Forming in this way does not make any difference in terms of the function of the constant velocity joint, but the connecting pieces are connected to the driving wheel 11 and the driven wheel.
By fixing the support shaft 18 to the connecting piece 13, the posture of the support shaft 18 itself is kept constant since the support shaft 18 is sandwiched between the two and its posture is restricted.

Embodiment FIG. 3 shows an example in which three connecting pieces are used, in which reference numeral 11 is a driving wheel, 12 is a driven wheel, and 1
3, 14 and 15 are connecting pieces, 16 is an engaging rod, 17
is a pivot, and 18 is a support shaft. The drive wheel 11 has three input pins 19a, 19b, 19.
c are protruded at radially evenly spaced positions across the center line, and are connected to the input side engagement grooves 21 and 2 of the connecting pieces, respectively.
Similarly, the driven wheel 12 has three output pins 20a, 20b, 20c protruding from the output side engagement grooves 22, 2 of the connecting pieces, respectively.
4,26 is inserted.

(Function) Since the connecting pieces 13, 14, and 15 are each attached independently, the rotational force transmission action is also performed independently.
The rotation of
can be conveyed to. Similarly, the rotation of the driving wheel 11 is transmitted to the driven wheel 12 via the connecting pieces 14 and 15, respectively.

(Effects) As detailed above, in the present invention, the rotational force of the driving wheel 11 is transmitted to the driven wheel 12 via a plurality of input pins, so the rotational force of the driving wheel 11 is distributed to each input pin 19. The Rukoto. Therefore, the force transmitted by each input pin becomes smaller, and as a result, a larger rotational force can be transmitted with a smaller device. In particular, since each of the input pins 19 is protruded at radially equidistant positions centering on the rotation center of the drive wheel 11, the rotational stress on the drive wheel 11 is balanced, and from this point as well, a larger force can be transmitted. It also enables high-speed rotation.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is an exploded perspective view showing the main parts of the same, Fig. 3 is a longitudinal sectional view showing another embodiment, and Fig. 4 is the main parts of the same. FIG. 5 is a vertical sectional view showing a conventional constant velocity joint, and FIG. 6 is a schematic diagram showing an operating state. 11... Drive wheel, 12... Driven wheel, 13, 14, 1
5... Connecting piece, 16... Engaging rod, 17... Pivot, 1
8...Support shaft, 19...Input pin, 20...Output pin,
21-26...Engagement groove.

Claims (1)

[Scope of utility model registration request] An engaging rod is installed between a point on the center line of the driving wheel and a corresponding point on the driven wheel, and a pivot is installed in the center of the engaging rod, and a support shaft is fitted to this. A pair of engagement grooves are formed symmetrically across the rotation center on a straight line passing through the rotation center, and the drive wheel has two or more coupling pieces fitted together. The same number of input pins are provided protruding at equal intervals radially around the center of rotation, and these are fitted into the engagement grooves of each linking piece, and output pins are similarly provided protruding from the driven wheel. A constant velocity joint characterized in that this is fitted into the other engagement groove of each connecting piece.