JPS608377B2 - Elastic belt locking toothed V pulley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a V pulley having belt locking teeth within the V groove.

The V-pulley and the V-belt that connects them are often used as a rotation transmission mechanism between shafts to which the V-pulley is fixed.

Such a rotational transmission mechanism has the advantage of being able to withstand high-speed rotation, making no noise, and being inexpensive, but it transmits rotational force through the frictional force between the V-groove provided on the outer peripheral surface of the V-pulley and the V-belt. Therefore, the transmission torque is lower than that of transmission mechanisms such as chains and gears, and the diameter of the V-pulley is restricted to a certain value. For this reason, especially when a V-pulley is used as a transmission mechanism to obtain a predetermined rotational speed from the output shaft of a motor, etc., the device becomes large, and when the rotational speed of the output shaft is variable, the speed is low. The transmission horsepower in the castle is limited to an extremely small amount that is practically impractical. On the other hand, there is a belt-type rotation transmission mechanism with a large transmission torque, which consists of a timing pulley having a plurality of locking teeth on its circumference and a timing belt continuous between the pulleys.

However, such timing belts are easily damaged by belt teeth jumping due to shock loads or belt slack, and the timing pulleys have a complicated shape and are therefore expensive. As a result of intensive research against the background of the above circumstances, the inventor of the present invention has discovered that the V-groove of the V-pulley connected to the uneven belt having wavy unevenness on the inner surface.
By providing locking teeth that lock onto the unevenness and are elastically deformable in the circumferential direction, it is possible to transmit torque without losing the advantages of the rotation transmission mechanism using the V-belt and without damaging the uneven belt. We discovered that it was possible to significantly increase the diameter of the V-boule and to reduce its diameter.

The present invention has been made based on the above findings. That is, the present invention provides a V groove IJ' in which an uneven belt having an uneven inner surface is hung on a V groove provided on the outer circumferential surface to transmit rotation, and a groove on the inner surface of the uneven belt. The cross-sectional shape of the grooves is C-shaped or U-shaped at equal intervals on one circumference across the V-groove so as to engage with the C-shaped or U-shaped groove.
The belt locking mouth is located toward the center of the V-pulley and includes belt-locking teeth that can be elastically deformed in the circumferential direction of the V-pulley.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below based on the drawings.

In Figures 1 and 2, reference numeral 2 denotes a V-pulley having a V-groove 4 with a V-shaped cross section on its outer peripheral surface. Eight through holes 6 are bored at equal intervals on one circumference.

In the opening □ part of the through hole 6 to the front and rear surfaces of the V pulley 2,
A chamfered portion 8 formed in a tapered shape is provided, and a flange portion 11 provided by widening both ends of the spring pin 10 inserted through the through hole 61 is latched at the chamfered portion 8. This prevents the spring pin 10 from coming off the V-pulley 2 while crossing the V-groove 4. The spring pin io has a length approximately equal to the thickness of the V-pulley 2, and has a length that is approximately equal to the thickness of the V-pulley 2. It is composed of a cylindrical spring material in which a slit 12 parallel to the center of the ball is formed in the circumferential wall facing the axis along the longitudinal direction.In other words, the spring pin 1 has a C-shaped cross section, Its entrance faces the axial direction of the V-pulley 2. Therefore, when a force is applied in the circumferential direction of the V-pulley 2, the circumferential surface that receives the force is mainly the width of the slit i2. It can be elastically deformed in the circumferential direction within the range allowed by K (circumferential gap of the spring pin).In addition, 14 is a V from above the flange portion il to prevent the rotation of the spring pin turtle Q. This is a dowel pin driven into the pulley 2, and 16 is a keyway with a semicircular cross section formed on the inner surface of the rattan hole 15.The V pulley 2 having the above configuration is manufactured as follows. be done.

Using a V-pulley having a normal external shape, a through-hole 6 is bored at a predetermined position of the V-pulley, and a chamfered part 8 is formed by cutting the closed part. Next, the spring pin turtle 0 is driven into the through hole 6 whose diameter is smaller than that of the spring pin 10 (approximately 10.5 ribs) with its slit 12 facing the center of the V-pulley 2, and then the spring pin 10 is pressed by pressing. A flange portion 11 is formed by expanding both ends. Furthermore, a small diameter hole is bored from above this flange portion 11 toward the V-pulley 2 to prevent rotation of the spring pin 10 in which the knock pin 14 is driven into the hole. In this way, V
Since the pulley 2 is constructed by simple machining, it has the advantage of being inexpensive compared to gears and timing pulleys used in other rotational transmission mechanisms. The above V pulley 2 is
As shown in FIG. 3, the output shaft 18 is iron-coupled with the key groove 16 so that the key groove 20 with a semicircular cross section and the key groove 16 are aligned with each other. Groove 20
and are fixed to the output shaft 18 by an elastic key 22 shaped like a coil spring driven into a circular key hole formed by the two.

An uneven belt 28 having an uneven inner peripheral surface is hung between the V pulley 2 and a normal V pulley 26 with a large diameter fixed to the input shaft 24, so that the rotational force between the two pulleys 26 and 2 is applied. is now being transmitted. In addition, the elastic key 22
Even if shock loads or slight vibrations are applied over a long period of time, it will elastically absorb them and there will be no permanent deformation of the key, resulting in an output of 1.
8 and the V-branch 2 to prevent wear between them. Also, spring pin IP'
A recess 301 formed on the inner surface of the textured belt 28 is engaged to form a belt engagement tooth. The operation of this embodiment will be explained below.

As shown in FIG. 1, when the uneven belt 28 rotates in the direction of arrow M, a gap K exists in the notch 2 of the spring pin before the spring pin 10 is locked in the recess 38'. The opposing left and right side wall surfaces 32 of the concave portion 30 of the uneven belt 28 which is in a straight line form an opening angle of about 30 degrees with respect to each other.

A shows the spring pin 10 and the recess 30 in this state. As the belt 28 is moved, the recess 30
When the single spring pin blade 0 is locked, the uneven belt 28 is curved along the V groove 4 on the outer periphery of the V pulley 2, so that the left and right side wall surfaces 32 of the recess 30 are approximately parallel to each other. At the same time, the spring pin 10 is deformed in a direction in which the gap K of the slit 12 is reduced according to the pressing force of the side wall surface 32. B shows the spring pin 10 and the recess 38 in this state. When the uneven belt 28 is further moved, the uneven belt 2
8' is further curved, so that the side wall surface 32 further presses against the spring pin 10. As a result, the spring pin 1Q' is deformed to such an extent that the gap K between the slit 12 disappears, and the side wall surfaces 32 form a closing angle of about -20 degrees with each other. 10, and the uneven belt 28 receives a force in a direction approaching the axis of the V-pulley 2.
It shows. When the uneven belt 28 is further moved, the uneven belt 28 returns to the above-mentioned state from B to A, and the spring pin 1 is easily removed from the concave portion 30, and the uneven belt 28 returns to the straight state. Become.

The above-mentioned actions are performed by each spring pin 10 and recess 3.
Q: It is done continuously and persistently. in this way"
According to the rotation transmission mechanism of this embodiment, the uneven belt 28 is prevented from biting in the center direction of the V pulley 2 by the spring pin 10', so that the lateral pressure of the uneven belt 28 is reduced by 4. Deterioration is prevented, and since the concave portion 301 of the uneven belt 28 has the effect of gripping the spring pin 10, tooth jumping is prevented even in a slack state, and damage to the uneven belt 28 is prevented.

In addition, since the spring pin 1 can be elastically deformed in the circumferential direction, the plurality of spring pins always lock the recess 30 without wobbling and receive the load, so even if a shock load is applied, a specific part The load is not concentrated on the uneven belt 28, and at the same time, harmful micro-vibrations of the uneven belt 28 itself are not generated, and the durability of the uneven belt 28 is improved. Therefore, it is possible to provide a V-pulley that dramatically improves the transmission torque and has a significantly smaller diameter without impairing the characteristics of the rotational transmission mechanism based on the V-pulley core, which is high-speed and inexpensive. . According to the inventor's experiments, when using the uneven belt 28 made of willow with a thickness of 8, an elastic belt locking toothed V pulley 2 with a diameter of 30 sails (approximately 1'2 compared to a conventional V pulley) is used.
It has been found that the method can be put to practical use. The above-mentioned embodiments are merely examples of the present invention, and the present invention can be modified in various ways without departing from its spirit.

For example, in the above-mentioned embodiment, a normal V-pulley 26 with a large diameter is used because the transmission torque is large, but unlike the V-pulley 2, a spring pin 10 that is a belt locking tooth is used. It is okay to do so.

In this case, it is ensured that the input track 24 and the output calibrator 8 rotate in synchrony. Since the spring pin 10' may have a tubular shape and be biased in the direction of expanding its diameter, the holes provided on the side wall of the spring pin 10' are not only straight, but also wave-shaped as shown in FIG. It is also possible to use a spring pin 36 in which an opening 34 is formed.

In order to form flange parts il at both ends of the spring pin 1-Q, a plurality of shallow notches parallel to the axial direction are provided on the end surface,
The end face may be expanded easily. In addition, the number of spring pins provided on the V pulley 2 is
It can be changed variously depending on the diameter of the grooved belt 28 and the interval between the recesses provided on the inner surface of the uneven belt 28 to be used. V grooves may be formed in parallel.

Further, since the spring pin 106 or the concave portion 39' may be gripped and elastically deformed in the circumferential direction of the V pulley 2, as shown in FIG. 48 may be a spring pin 42 having a U-shaped cross section inserted into a hole 41 having a semicylindrical cross section formed in the V pulley 2 so as to face the center of the V pulley 2.

In this case, there is an advantage that the knock pin 14 that prevents the rotation of the spring pin 42 is not required. In addition, 44
is a stopper bent at both ends to prevent the spring pin 42 from coming off;
This corresponds to As detailed above, the elastic belt locking toothed V-pulley of the present invention can be made small in diameter without damaging or adversely affecting the durability of the uneven belt hooked to the V-pulley, and can be used at low speeds. Since it is also capable of transmitting high torque, it can be put to practical use even in the low-speed rotation range, and has the effect of providing a significantly smaller and cheaper V-pulley type transmission mechanism.

[Brief explanation of the drawing]

FIG. 1 is a front view including a partial cross section of an embodiment of the present invention, and is a diagram for explaining its operation. FIG. 2 is a side view, partially in section, of the embodiment of FIG. 1. FIG. 3 is a diagram showing a rotation transmission mechanism in which the embodiment of FIG. 1 is used. FIG. 4 is a perspective view showing another embodiment of the spring pin. FIG. 5 is a partially sectional front view showing the main parts of another embodiment of the present invention. 2: V pulley
4: V groove, 10: Spring pin (belt locking tooth), 1
2: Slit (Sekiguchi) 28: Belt with unevenness, 30:
recess. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a V pulley that transmits rotation by a V-groove provided on the outer circumferential surface of the V-groove and a concave-convex belt with concave and convex grooves on the inner surface thereof being hung, the V-groove with concave and convex grooves is arranged so as to engage with the concave portion of the inner circumferential surface of the V-groove belt. The cross-sectional shape is C at equal intervals on one circumference across the V groove.
It forms a letter or a U-shape, and the opening of the C- or U-shape is the V-shape.
A V-pulley with elastic belt-locking teeth, comprising belt-locking teeth positioned toward the axis of the pulley and elastically deformable in the circumferential direction of the V-pulley.