JPS62127544A - Chain belt for v-pulley - Google Patents

Abstract

PURPOSE:To improve resistance to wear as power transmission efficiency is maintained, by a method wherein, in a block pressed against the power transmis sion surface of a V-pulley, a noncontact part away from the power transmission surface is mounted to the end surface on the side positioned facing the power transmission surface. CONSTITUTION:In a chain belt 7, a power is transmitted in a way that a block 9 is pressed against a V-pulley. Although lubricating oil is fed through a contact surface 9b and the V-pulley, since a contact surface 9b has a narrow width, a contact pressure between the V-pulley and the contact surface is increased, and the thickness of an oil film is suppressed to a minimum limit. Meanwhile, although the flow of lubricating oil on the power transmission surface of the V-pulley under rotation is deviated backward thanks to a centrifugal force and adhesion, since the contact surface 9b is present in front in the direction of rotation, the thickness of an oil film is excellently controlled. Further, the contact surface is sloped and has a narrow width, and this constitution decreases stagger between the contact timing and the separating timing of the block 9, and enables prevention of decrease of a contact area between a chain belt 8 and the V-pulley.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to (1) a chain belt that is wound around a pulley and transmits power by the friction generated between it and the power transmission surface of the V-pulley; It is related to.

``Prior Art'' In general, for example, in a transmission of a motor, a pulley (1) and a chain belt wound around the pulley (2) are used to transmit power.

As an example of the conventional structure of the chain belt,
The structures shown in FIGS. 1 and 2 are known.

The chain belt l includes a main link plate 2 formed in a hollow Y shape and having a through hole 2a formed in each of two protrusions, and a root blade shape formed in the through hole 2a of the main link plate 2. a sub-link plate 3 having two through holes 3a formed at the same pitch;
A joint pin 4 having a fan-shaped cross section rotatably connects these main link plates 2 and sub link plates 3, a rocker pin 5 formed shorter than the joint pin 4, and a pair of main link plates 2. A rectangular columnar block 6 is provided that penetrates through the remaining protrusion and integrally connects both main link plates 2 at intervals in the thickness direction.

Then, between the pair of main link plates 2, a plurality of sub-link plates 3 are inserted into respective through holes 3a.
are arranged at equal intervals so as to be located on the same center line as the through hole 2a of the main link plate 20, forming the first unit A, and each link plate 2 of the first unit A is
The second unit B is constructed by omitting one of the sub-link plates 3 while maintaining the interval of 3, and the first unit A
and the second unit B alternately, and the through hole 2a.
・The rocker pins 5 are overlapped so as to mesh with each other by the pitch of 3a, and the fan-shaped outer surface of the rocker pin 5 is inserted into the through holes 2a and 3a of each of the overlapped link plates 2 and 3. Insert the joint pin 4 between the through holes 2a of A with the joint pin 4 facing inward.
is inserted in the opposite direction to the locker bin 5, and then the joint pin 4 to the adjacent first unit is connected by the sub-link plate 3 provided across the plan 1 unit A, and in this way, the first unit A By sequentially connecting a large number of second units B, an endless chain heald 1 is constructed as shown in FIG.

On the other hand, the chain heald 1 configured as described above is
As shown in FIG. 2, the longitudinal end face of the block 6 is brought into pressure contact with the power transmission surface of the V pulley P, and the frictional force generated at this time transfers the power from the V pulley to the other V pulley.
The signal is transmitted to a driven member such as a pulley.

"Problems to be Solved by the Invention" The present invention aims to solve the following problems in the conventional technology described above.

That is, the chain belt l, which transmits power through friction as described above, applies overcurrent lubrication to the contact surfaces between the block 6 and the V-pulley P in order to suppress wear caused by frictional force and frictional heat. Although it is used with oil supplied, the problem is that the lubricating oil tends to be trapped between the V-pulley P and the block 6 and form a thick oil film F, as shown in FIG. be.

There is a need for countermeasures against such problems because (1) there is a risk that the coefficient of friction between the pulley P and the block 6 will be reduced and the power transmission efficiency of the chain belt l will be reduced.

"Means for Solving the Problems" The present invention provides a V
Since the intention is to provide a chain belt for a pulley, the chain held has a non-contact member spaced apart from the power transmission surface on the end surface of the block that is brought into pressure contact with the power transmission surface of the V-pulley, on the side facing the power transmission surface. A narrow contact surface is provided by forming the contact portion, and the end of the contact surface on the center side of the V-pulley is located further forward in the rotational direction of the V-pulley than the outer end. .

"Function" By having the above-described structure, the chain belt according to the present invention increases the contact surface pressure between the block and the V-boot, and also allows lubricating oil to enter between the contact surface and the V-pulley through the non-contact portion. This is to push back the lubricating oil between the block and the pulley.

"Embodiment" The present invention will be described in detail below based on a preferred embodiment shown in FIGS. 4 to 9.

Reference numeral 7 in FIG. 4 indicates a chain belt according to this embodiment, which includes a plurality of link plates 8 rotatably connected to each other, and a V-pulley P provided integrally with each of the link plates 8. block 9 which is brought into pressure contact with the power transmission surface of
and a joint pin 10 and a rocker pin 11 for rotatably connecting the link plate 8,
In addition, the block 9 has a schematic structure in which a narrow contact surface 9b is provided by forming a non-contact portion 9a spaced apart from the power transmission surface on the end face of the block 9 on the side opposite to the power transmission surface. ing.

As shown in FIGS. 4 to 6, the block 9 has ni
It is formed into a bar shape with a rectangular cross section so that when it is inserted into the mounting hole 14 of the main link play (j) 8a, it comes into contact with the inner circumferential surface of the main link play over the entire circumference. As shown in FIGS. 5 and 6, each end face in the length direction is formed in a V shape so as to match the slope of the power transmission surface of the pulley P, and the diagonal line of the end face is
The contact surface 9b is provided by forming a non-contact portion 9a at each corner. As shown in FIG. 4, the contact surface 9b is formed to have a width approximately half the width of the short side of the block 9, and is formed to be inclined along a diagonal line of the rectangle. Therefore, as shown in FIG. 8, the inclination of the contact surface 9b is such that when it is in contact with the V-pulley P, the center end of the V-pulley P is 2. The direction is such that the pulley P is located forward in the rotational direction of the pulley P.

The joint pin 10 and the rocker pin U are the fourth
As shown in the figure, the joint pin 10 is formed into a rod shape with a fan-shaped cross section, and as shown in FIGS. It is formed to be longer than twice the length. Then, both pins 10 and 11 are connected to the fourth
As shown in the figure, it is inserted into the through holes 12 and 15 of the main link plate 8a and sub link plate 8b with their outer surfaces in contact with each other, and one of the pins (11) is inserted into the locking protrusion. 13 (16) and the other pin 11 is engaged with the one pin to (11).
(10) are relatively rotated within the through holes 12 and 15, thereby rotatably connecting the link plates 8a and 8b.

These component keys constitute a first unit C and a second unit D, as shown in FIGS. 5 to 7, similar to the first unit Δ and second unit B shown in the conventional example, By sequentially connecting both units CD, an endless chain belt 7 is assembled.

Chain belt 7 of this embodiment formed in this way
is wound around the V-pulley P, and the contact surface 9b of the block 9 is brought into pressure contact with the power transmission surface of the V-pulley P, thereby transmitting the power accompanying the rotation of the V-pulley P to the driven part of the pond. do.

Lubricating oil is supplied between the contact surface 9b of the block 9 and the power transmission surface of the pulley P, but the contact surface 9b of the block 9 is formed narrowly;
The contact pressure between b and the power transmission surface of the V pulley P is increased and excess lubricant is discharged, and some of the lubricant that enters between the contact surface 9b and the power transmission surface is removed as shown in FIG. As shown by the arrow A, the non-contact portion 9a pushes the oil film back outward from between and between the facing surfaces of the block 9 and the pulley P, so the thickness of the oil film formed between them is minimized. .

On the other hand, the flow of the lubricant on the power transmission surface of the rotating pulley P is as follows: ■If the rotation direction of the pulley P is the direction shown by the arrow in Fig.
Due to the adhesive force of + itself, V
The pulley P draws a trajectory that deviates backward in the direction of rotation as it approaches the outer periphery, but in this embodiment, the contact surface 9
Since b is oriented such that the center end/portion of the pulley P is located in the rotational direction nQ of the V pulley P from the outer end, the lubricating oil flows smoothly. As a result, the lubricating oil is prevented from entering between the power transmission surface and the block 9, and from this point of view as well, the thickness of the oil film described above is well controlled.

Furthermore, by making the contact surface sloped and narrow,
Since the contact surface can be made as long as possible while maintaining the above-mentioned effect, ■ the gap between the contact timing of the knock on the winding side of the boob and the separation timing of the J block on the feeding side can be minimized. Thus, it is possible to prevent an instantaneous decrease in the contact area between the chain belt and the V-boot.

It should be noted that the various shapes and dimensions of each component shown in the above embodiments are merely examples, and can be variously changed based on the type of power transmission system to be applied, design requirements, etc.

For example, an example is shown in which the width of the contact surface seal is approximately half the width of the block 9, but the invention is not limited to this. It is set in consideration of the rotational speed of P and the activity of the lubricating oil used.

"Effects of the Invention" As explained above, the chain belt for V pulleys according to the present invention includes a plurality of link plates rotatably connected to each other, and the V pulley chain belt provided integrally with each of the link plates. a block that is brought into pressure contact with the power transmission surface of the pulley, and a non-contact portion spaced apart from the power transmission surface is formed on an end surface of the block on the side facing the power transmission surface. A narrow contact surface is provided, and the end of the contact surface on the center side of the pulley is located forward in the rotational direction of the V-boot from the outer end, and the contact surface of the block is is formed narrowly to increase the contact pressure between the contact surface and the power transmission surface of the V-boo, thereby minimizing excess lubricating oil between the contact surface of the block and the power transmission surface of the V-boo. A part of the lubricating oil that is discharged and enters between the contact surface and the power transmission surface is pushed back outward from between the facing surfaces of the block and the boob by the non-contact part, thereby forming a lubricating oil between the two. (7) of the filter oil film can be kept to a minimum. Therefore, it is possible to improve wear resistance while maintaining power transmission efficiency as much as possible by controlling the frictional force generated between the pulley and the block within a positive range of Ia. In addition, by slanting the contact surface, ■ the difference between the contact timing of the block on the winding side of the pulley and the separation timing of the block on the sending side can be minimized, and while maintaining the above-mentioned effect, the chain belt and V It has excellent effects such as being able to prevent an instantaneous decrease in the contact area with the pulley.

[Brief explanation of drawings]

In the figure, Figures 1 to 3 show an example of the structure of a conventional chain belt.
A sectional view along the line ■-■ in the figure, Figure 3 shows the block and V
The enlarged schematic diagrams of the main parts of the noni-like part, FIGS. 4 to 9, which illustrate the state of contact with the pulley, show one embodiment of the present invention.
4 is a view similar to FIG. 1, FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. 6 is a sectional view taken along the line VI-VI in FIG. Figure 7 omits part of Figure 4■-■
Fig. 8 is a schematic diagram showing the chain belt wound around the pulley, Fig. 9 is a cross-sectional view taken along the line,
FIG. 3 is an enlarged schematic view of the main part showing the state of contact with the boob. 7...Chain belt, 8...Link plate, 8a...Main link plate, 8b
...Sub link plate, 8c...Pin link plate, 9...Block, 9a...
...Non-contact part, 9b/9c...Contact surface, 1
0...Joint pin 11...Rocker pin, 12/15...Through hole, 13/16...
・Latching protrusion, 14...Mounting hole, 17...
・Mating hole.

Claims (1)

[Claims] A chain belt that is wound around a V-pulley to transmit power, and includes a plurality of link plates rotatably connected to each other, and a chain belt that is integrally provided on each of the link plates to transmit power to the V-pulley. a block that is brought into pressure contact with the surface, and a narrow contact surface is formed by forming a non-contact portion spaced apart from the power transmission surface on an end surface of the block that faces the power transmission surface. A chain belt for a V-pulley, characterized in that the contact surface is provided such that the end of the contact surface on the center side of the V-pulley is positioned forward in the rotational direction of the V-pulley from the outer end.