JPS6364667B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a pulley with multiple V grooves made of sheet metal (hereinafter referred to as a poly V pulley) used for driving a poly V belt.
This is related to the improvement of

The poly V pulley has a structure in which a V-shaped groove is formed in the pulley peripheral wall, and the pulley peripheral wall is thick in order to achieve dynamic balance and transmit large rotational torque.

In this regard, the inventor filed a patent application filed in 1983.
In the specification of No. 094353 "V-ribbed pulley manufacturing method", it is stated that the bottom wall part is made thinner than the metal material by press working from the metal material, and the peripheral wall part is plastically worked while maintaining the thickness of the metal material. The inner and outer circumferential surfaces of the peripheral wall are formed correctly parallel to the axial direction.
At the same time, after forming the flange part, it is described that a precise poly V groove is formed using a rolling roller, but as a result of further various studies, it was found that when used for driving a vehicle engine, Due to the increase in humidity in the engine room and the driving of the poly V belt, the humidity of the poly V pulley increases significantly, resulting in the disadvantage that the poly V belt ages and breaks.

In order to eliminate the above-mentioned drawbacks, the present invention provides polyV
In addition to increasing the surface area of the pulley to dissipate heat, air turbulence is generated near the inner peripheral surface of the poly-V pulley to actively dissipate heat generated in the poly-V pulley from its surface. Reduces the frictional heat generated by the pulley rotation torque with the poly V belt,
The purpose is to prevent aging of the poly V pulley, and specifically, a large number of uneven grooves are provided on the entire inner peripheral surface of the peripheral wall of the poly V pulley in order to increase the surface area. The uneven grooves on the entire inner peripheral surface increase the surface area for heat dissipation, and the uneven grooves generate air turbulence around the poly-V pulley.
It actively dissipates heat.

This will be specifically explained below using examples.

In Fig. 1, 1 is a metal material with a thickness of t ₁ , and punches 22 and 23 are used to punch the material to a thickness thinner than t _1.
A hemispherical bottom wall portion 2 of t ₂ is formed, and then a peripheral wall portion 3 of the correct shape is formed by press working. Next, by press working, the peripheral wall portion 4 is bent while maintaining the plate thickness of _t1 , and then the flange 5a is formed,
Next, the flange 5b is formed by press working and the rotating roller 35, and the pulley material 7 shown in FIG.
form. The peripheral wall portion 5 of the pulley material 7 has flanges 5a and 5b, and has an outer peripheral surface 5c and an inner peripheral surface 5.
d and is composed of a bottom wall portion 3. 36 is a rotating roller, 39a and 39b are rollers for the inner circumferential surface, and the roller 39 fits on the inner circumferential surface 5d.
The outer peripheral surface 37 of a has a trapezoidal uneven groove 38. Next, to explain the process of plastically forming uneven grooves on the inner peripheral surface 5d, as shown in FIG.
An inner peripheral surface roller 39 is attached to the inner peripheral surface 5d of the pulley material 7.
a, 39b are inserted and rotated while pressing the rotary roller 36 with a force of several tons, a trapezoidal uneven groove 4 is formed on the inner peripheral surface 5c of the peripheral wall portion 5, as shown in FIG. 4B.
0 will be formed all around the circumference.

Next, as shown in FIG.
In order to form a poly V
This is to form the groove 6.

FIGS. 6 and 7 show a poly V pulley according to the present invention manufactured by the method described above, in which the inner peripheral surface 5d of the peripheral wall is provided with uneven grooves 40 in the trapezoidal shape shown in FIG. 6A.
is formed parallel to the axis over the entire inner circumferential surface, and furthermore, as shown in Fig. 6 C and D,
Instead of the trapezoidal uneven groove shape, it may be wavy or semicircular.

Furthermore, as shown in FIG. 7, the uneven grooves provided on the inner circumferential surface of the peripheral wall portion can be formed into a threaded shape with a certain lead angle θ such that the inner circumferential surface roller can be removed. However, θ in this case is
Appropriately, the angle is about 15 degrees or less from the insertion and removal of the inner roller, and since the uneven grooves are provided diagonally, air can be sent toward the bottom wall, further improving the heat dissipation effect.

As described above, the present invention actively increases the surface area of the inner circumferential surface of the poly V pulley by forming a large number of uneven grooves on the entire inner circumferential surface of the poly V pulley to improve heat dissipation. Furthermore, air turbulence is generated around the inner periphery of the poly V pulley to improve heat dissipation and to prevent deterioration of the poly V belt due to heat as much as possible. Incidentally, the uneven grooves on the inner circumferential surface can also be formed at the same time as rolling the poly-V pulley grooves.

[Brief explanation of drawings]

Figure 1 shows the forming process of a poly V pulley. A is a cross-sectional view of the metal material, B is a bottom wall forming process diagram, C is a cross-sectional view of the material after the step B has been completed, and D is the final bottom wall part. Figure 5 shows a diagram of the forming process, E is a diagram of the bending process of the peripheral wall, F is the first process diagram of flange forming, and G is the final process diagram of flange forming. FIG. 2A is a diagram of the state immediately before forming a large number of uneven grooves parallel to the axis on the inner circumferential surface of the present invention, and FIG. 2B is a cross-sectional view taken from A to A in FIG. FIG. 3 is a diagram showing the state in which uneven grooves are being formed on the inner circumferential surface, A in FIG. 4 is a diagram showing the situation after forming the uneven grooves on the inner circumferential surface, and B is a sectional view taken along line B-B. A in Fig. 5 is a process diagram immediately before V-groove forming using a rolling roller.
B is a diagram showing the situation after V-groove forming is completed. A in FIG. 6 is a partially omitted plan view of this embodiment, and b is a partially omitted plan view of this embodiment.
~e sectional view. Further, C is a cross-sectional view showing partially enlarged semicircular grooves on the inner circumferential surface, and D is a cross-sectional view showing wave-shaped grooves. FIG. 7 is a partially enlarged sectional view of another embodiment in which uneven grooves having a lead angle of θ° with respect to the axis are provided on the inner circumferential surface. 1... Metal material, 5... Peripheral wall portion, 5a and 5b
... Flange, 5c ... Inner peripheral surface, 7 ... Pulley material, 38, 38a, 38b ... Uneven groove, 39a,
39b... roller for inner peripheral surface, 46... uneven groove having a lead angle.

Claims (1)

[Claims] 1 Metal material is pressed to create multiple Vs on the peripheral wall.
In a poly V pulley provided with a groove, over the entire inner peripheral surface of the peripheral wall portion provided with the poly V groove,
Poly V is characterized by having many uneven grooves.
Pulley.