JPH0745895B2 - Transmission belt - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transmission belt that is used by being stretched between V-groove pulleys.

(Prior Art) Various types of transmission belts of this type have been known in the past.
There is one as shown in Japanese Patent No. 42345.

This transmission belt has a link connecting body in which a large number of pins are connected to each other by a link plate, and a series of V-shaped blocks are provided on the link connecting body so as to be slidable in the longitudinal direction. In practical use, the V-shaped block is wound around the V groove of the pulley so that power can be transferred between the V groove pulleys.

However, in this configuration, there is only one link connecting body,
If a series of V-shaped blocks are assembled to this, the distance between the ends of the link plate and the center of rotation of the pulley will be different in the pulley winding area, and the V-shaped blocks at both ends of the link plate will be located in the pulley V groove. Because of the floating, the pitch of the V-shaped blocks that frictionally engages with the pulley V groove was substantially the same as the pin arrangement pitch. For this reason, the linear portions of the transmission belt between the V-groove pulleys repeatedly generate string vibrations that move toward and away from each other, which not only causes abnormal noise and noise, but also causes a load to be applied to a specific V-shaped block. Concentration was also disadvantageous in terms of durability.

In order to solve the problem, it is effective to reduce the pin arrangement pitch, but there is a limit to the size reduction due to the requirement on the pin and link strength, and the problem can be solved. The reality was that I didn't get it.

As another method of reducing the pin arrangement pitch, a plurality of link connecting bodies are juxtaposed so that the positions of the pins are displaced, and a common V-shaped block is assembled to the juxtaposed link connecting bodies. It is conceivable to reduce the arrangement pitch of the upper pins by the above deviation.

(Problems to be Solved by the Invention) However, in this measure, as shown in FIG. 3, at a pulley winding portion of a V belt, a link plate 10 of a certain link connecting body and an adjacent link plate 11 of another link connecting body are provided. Will stick out like a ΔL at the pin joint.
Therefore, the hole of the V-shaped block to be fitted to the link connection body arranged side by side must be increased by the amount of overhang ΔL,
The V-shaped block tilts due to rattling with respect to the link connecting body, which causes increased wear of the V-shaped block and increased pulley collision noise due to abnormal contact.

This tendency becomes more remarkable as the overhang amount ΔL becomes larger. As shown in FIG. 3, the overhang amount ΔL is defined by R for the V belt winding arc diameter and L for the pin arrangement pitch in each endless link connecting body.
Let _{P be} the phase shift angle between the endless link concatenations juxtaposed, and However: It is represented by.

Here, as described in the above-mentioned document, although the inner edge of each link plate forming the inner circumference of the endless link connection body is formed in an arc shape along the V belt winding arc, each link forming the outer circumference of the endless link connection body. Considering the case of following the conventional link plate shape in which the outer edge of the plate is a straight line or a reverse arc shape, the above-mentioned protrusion amount ΔL becomes extremely large as shown by the solid line a in FIG. Cannot be denied.

An object of the present invention is to solve the above-mentioned problems by providing a transmission belt in which the amount of overhang is the smallest within the practical range of the V-belt winding arc diameter.

(Means for Solving the Problem) To this end, the present invention provides a plurality of endless link connecting bodies in which a large number of pins are connected to each other by a link plate, and the positions of the pins are the endless link connecting bodies. A large number of V-shapes that are displaced in the longitudinal direction of the link connecting body and are juxtaposed so as not to be relatively displaceable in the longitudinal direction so as to collectively enclose these endless link connecting bodies in the lateral direction and frictionally engage with the pulley V groove. In a transmission belt in which blocks are sequentially provided in the longitudinal direction of the juxtaposed endless link connecting bodies, the inner and outer edges of each link plate forming the inner and outer peripheries of the endless link connecting body are respectively along V-belt winding arcs. The arc shape is the arc shape at the inner and outer edges of each of these link plates.
A common center that coincides with the V-belt winding arc center in the V-belt winding state near the gear ratio 1 or in the V-belt winding state when the V-belt winding arc diameter is twice the practical minimum diameter. It is an arc having points.

(Operation) During the practical use of the transmission belt hung between the V-groove pulleys, the power of the drive-side pulley reaches from the V-shaped block frictionally engaged with the V-grooves to all the endless link joints, and then the driven side. It reaches the pulley through a V-shaped block frictionally engaged with the V groove of the pulley, and enables transfer of power between the two pulleys.

During this period, the transmission belt wound around the pulley has a plurality of link connecting bodies arranged in parallel so that the positions of the pins are displaced, so that the pin arrangement pitch is substantially reduced. As a result, the polygonal winding shape of the transmission belt around the pulley is close to a circle, which not only reduces the string vibration and suppresses the generation of abnormal noise, but also improves the durability by avoiding the load concentration on a specific V-shaped block. Can be made.

In addition, if a plurality of endless link connecting bodies are juxtaposed so that the positions of the pins are displaced, the inner and outer edges of each link plate also have an arc shape along the transmission belt winding arc, and The arc shape on the outer edge is the V-belt winding arc when the V-belt is wound around a gear ratio of 1 or when the V-belt winding arc diameter is twice the practical minimum diameter. Since the arc shape has a common center point that coincides with the center,
The diameter of the belt winding arc can be minimized in the practical range, and the rattling of the V-shaped block can be reduced accordingly, and the wear of the V-shaped block due to abnormal contact and the pulley collision noise can be reduced.

(Example) Hereinafter, the present invention will be described in detail based on an illustrated example.

FIG. 1 shows an embodiment of a power transmission belt of the present invention. FIG. 1 (a) is a cutaway plan view of a main part, FIG. 1 (b) is a vertical sectional view, and FIG.

Reference numeral 1 in these figures denotes a large number of pins, and these pins are mutually connected by a link plate 2 to form endless link coupling bodies 3 and 4. Each pin 1 is 2 in the radial direction.
It is well known as a silent pin composed of divided parts 1a and 1b, and by making the divided surfaces mutually opposite cylindrical surfaces, the link plates 2 mutually make rolling contact of the opposite cylindrical divided surfaces as shown in FIG. 1 (c). So that it can rotate.

In this example, the two endless link connecting bodies 3 and 4 are connected to the pin 1
Side-by-side so that the positions of
Is inserted between the pins 1 of the other link connecting body. At this time, if there is a gap between the ends of the pins 1 that have entered each other, the gap 5 is filled with the bush 5 (only one is shown in the drawing for convenience) so that the relative positions in the longitudinal direction of the link coupling bodies 3 and 4 do not change. To be kept at.

V which encloses these link connecting bodies 3 and 4 together in the lateral direction
The shaped blocks 6 are sequentially provided slidably in the longitudinal direction of the link connecting bodies 3, 4. Therefore, the windows formed in each V-shaped block 6
Protrusions 6b are provided between 6a to keep the relative positions of the link connectors 3 and 4 in the axial direction of the pin (1) unchanged.

In assembling the above-mentioned transmission belt, the link connecting bodies 3 and 4 are assembled until just before the endless shape, and the link connecting bodies 3 and 4 are juxtaposed. The window 6a of the V-shaped block 6 is fitted into the link connection bodies 3 and 4 arranged side by side in this way, and the V-shaped block 6 is assembled in sequence. Then, when the final V-shaped block is fitted, the link connectors 3, 4 are inserted while inserting the final pin 1 through the pin insertion hole 6c shown in FIG. 2B provided in the final V-shaped block. The assembly of the transmission belt is completed by forming the endless shape. If you do not want to thicken the final V-shaped block with the pin insertion hole 6c, see Fig. 2 (b).
As shown by a two-dot chain line, a semicircular cutout 6d may be formed so as to face the mating surfaces of a pair of adjacent V-shaped blocks, thereby forming a pin insertion hole.

In practical use, as shown in FIG. 1 (b), the V-shaped block 6 is wound around the pulley V groove 7 and the transmission belt is stretched between the V groove pulleys. At this time, the power of the driving pulley is changed from the V-shaped block 6 frictionally engaged with the V groove to the link connecting body.
After reaching 3 and 4, after reaching the pulley through the V-shaped block 6 frictionally engaged with the V groove of the driven side pulley, power can be transferred between both pulleys.

In this example, the link connecting bodies 3 and 4 are set as a pair of two,
By arranging each pin 1 side by side,
The arrangement pitch of the pins 1 is 1 / L as shown in FIG. 1 (b).
It can be halved to 2L, and the bending pitch of the transmission belt wound in the pulley V groove 7 can be halved. As a result, the polygonal shape of the transmission belt with respect to the pulley becomes closer to a circle, and when the V-shaped block 6 is wound into the pulley V groove 7 or when it is paid out, the contact position with the pulley V groove is only slightly in the pulley radial direction. It is not displaced and the string vibration can be reduced.

Also, when each V-shaped block 6 is positioned at both ends of the link plate (2) of a certain link connecting body 3 (4), the V-shaped blocks 6 of the other link connecting bodies 4 (3) are centered in the same manner. Will be located in the department. Therefore, the pulley V
Even if the V-shaped block 6 is not frictionally engaged with the groove 7 by the former link plate, it is not frictionally engaged with the V groove 7 by the latter link plate.
The shape block 6 can be eliminated. Therefore, the pulley V
The load can be shared by all the V-shaped blocks in the groove 7, and the load can be prevented from being applied to a specific V-shaped block.

By the way, in the present invention, as shown in FIG.
The inner and outer edges 2a, 2b of each link plate 2 forming the inner and outer peripheries of the endless link coupling bodies 3, 4 are arcuate along the transmission belt winding arc, and the respective radii of curvature R ₁ , R ₂ are as follows. decide. That is, FIG. 2 (a) is a schematic diagram in the case where the pulley winding arc diameter of the transmission belt is the maximum such as R ₁ , and FIG. 2 (b) is an intermediate value like R _m (gear ratio 1: 1) or a schematic diagram in the case of a doubled value of the minimum diameter, and FIG. 7C shows a schematic diagram in the case of the minimum value such as R _s .

The radii of curvature R ₁ and R ₂ are assumed to have a center of curvature on the pulley rotation center in the wound state shown in FIG. 2 (b), respectively, and therefore, from the transmission belt winding arc to the inner and outer edges of the link plate 2. The radii of curvature R ₁ and R ₂ are determined so that R ₁ = R _m −H ₁ R ₂ = R _m + H ₂ when the widths reaching 2a and 2b are H ₁ and H ₂ , respectively.

In such a configuration, the transmission belt winding arc diameter is set to the gear ratio 1
Alternatively, in the state of FIG. 2 (b) where R _m is set to be twice the minimum diameter, the endless link connecting bodies 3 and 4 are projected from the other endless link connecting bodies 4 and 3, respectively. Absent.

Then, as the diameter of the circular arc around the transmission belt is increased toward R ₁ in FIG. 2 (a), the end of the link plate 2 moves from the adjacent endless link connecting body to the inner circumference as shown by 2c in FIG. Stick to the side.

As the diameter of the circular arc around which the transmission belt is wound becomes smaller toward R _s in FIG. 2 (c), the end of the link plate 2 is stretched from the adjacent endless link connecting body to the outer peripheral side as shown by 2d in the same figure. put out.

The amount of protrusion is shown by the dotted line b in FIG. 4, but this amount of protrusion is halved due to the arc shape of the inner and outer edges of the link plate. Therefore, it is not necessary to make the window shown by 6a in FIG. 1 (b) larger in consideration of the amount of overhang than in the conventional case, and the V-shaped block 6 can be used for the transmission belt winding arc diameter R _m in which the overhang is eliminated. The inclination due to the backlash can be reduced. Therefore, it is possible to prevent an increase in wear amount and pulley collision noise due to abnormal contact of the V-shaped block 6.

In addition, the pin arrangement pitch reduced by arranging a plurality of endless link connecting bodies 3 and 4 side by side so that the pin positions are displaced,
The collision primary frequency of the transmission belt is increased to shift the primary frequency from the pulsation frequency of the gear for power transmission in the transmission using the transmission belt or the pulsation frequency of the pump as the hydraulic power source for shift control, thereby eliminating the resonance point. This also helps reduce noise, which is also convenient in this respect.

(Effects of the Invention) As described above, in the transmission belt of the present invention, the inner and outer edges of each link plate are arcuate along the arcs around which the transmission belt is wound, and the arcuate shape of the inner and outer edges of each link plate has a gear ratio of 1 In the vicinity of the V-belt wound state, or in the V-belt wound state when the V-belt winding arc diameter is twice the practical minimum diameter, a common center point coincides with the V-belt winding arc center. Since it has an arcuate shape, the amount of protrusion between the endless link connecting bodies at the pulley winding portion of the transmission belt can be minimized in the practical range of the V-belt winding arc diameter. Therefore, it is possible to reduce the backlash of the V-shaped block with respect to these endless link connecting bodies, and to reduce the abnormal contact due to the inclination thereof, thereby reducing the wear of the V-shaped block and the pulley collision noise. .

[Brief description of drawings]

FIG. 1 shows an embodiment of a power transmission belt of the present invention. FIG. 1A is a cutaway plan view of relevant parts, FIG. 1B is a vertical sectional front view thereof, and FIG. Figures 2, (a), (b), and (c) are schematic views showing the spiral wrapping portion of the belt for each wrapping arc diameter, and FIG. FIG. 4 is an explanatory diagram showing the change characteristic of the amount of protrusion in comparison between the conventional belt and the belt of the present invention. 1 ...... pin, 2 ... link plate 2a ... same inner edge, 2b ... same outer edge 2c, 2d ... same overhanging part 3,4 ... endless link connection body 6 ... V-shaped block, 7 ...... Pulley V groove

Claims (1)

[Claims] 1. A plurality of endless link connecting bodies in which a large number of pins are connected to each other by a link plate.
The pins are arranged side by side such that the positions of the pins deviate in the longitudinal direction of the endless link connecting body and cannot be relatively displaced in the longitudinal direction, and these endless link connecting bodies are collectively laterally surrounded by the pulley V groove. A number of V-shaped blocks frictionally engaged,
In the transmission belt sequentially provided in the longitudinal direction of the side-by-side endless link connecting bodies, the inner and outer edges of each link plate forming the inner and outer peripheries of the endless link connecting body are arcuate along a V-belt winding arc. , The arc shape at the inner and outer edges of each of these link plates is
A common center that coincides with the V-belt winding arc center in the V-belt winding state near the gear ratio 1 or in the V-belt winding state when the V-belt winding arc diameter is twice the practical minimum diameter. A transmission belt having an arc shape having points.