JPS62151648A - Chain - Google Patents

Abstract

PURPOSE:To enable reverse warp of a chain, to prevent the generation of excessive stress in spite of reverse warp and to increase durability by making the radium of a large circular arc of the back of a locker pin shorter than the distance from the center to the center of an installation hole for the locker pin, and reducing the difference between the radium of the large circular arc and the radium of a small circular arc forming the thickness of the locker pin that much. CONSTITUTION:The center c1 of a large circular arc 2 and a small circular arc 5 forming the back and thickness of locker pins 1, 1 is placed on the substantially same line as a pitch line 7 of a chain, and the radium R1 of the large circular arc 2 is made shorter than the distance from the center O of a locker pin installation hole 4 of a link plate 3 to the center c1 of the large circular arc 2 by DELTAR. Accordingly, when the chain is curved in the reverse direction, the center c1 of the circular arc can be moved to c1', and the chain can be curved at an angle of theta1 with respect to a pitch line 7, so that the relative angle of bend to the adjacent link plate is 2theta1. Thus, the chain can be warped reversely, so that even if reverse warp is caused, the generation of excessive stress can be prevented to increase the durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting arrangement for a rocker pin of a silent chain or chain belt.

[Conventional technology]

Arc-shaped rocker pins are placed back to back and installed in the rocker pin mounting holes of the link plate, and as the rocker pins installed back to back are brought into contact and the link plate wraps around the subroket or boob, it engages with the link plate respectively. In a silent chain or chain belt configured so that the rocker pin rolls while contacting the back thereof, the rocker pin 1 has conventionally been used as shown in FIG.

The center C of the arc 2 forming the back surface of the losocapine 1.
The chain is offset inwardly from the pitch line Pl) passing through the center O of the hole 4 of the link plate 3 to which the link plate 1 is attached by an angle θ and a distance 1ilIIe in the same direction. When the chain is bent in the direction of wrapping around the sprocket or pulley, the center C of the circular arc (hereinafter simply referred to as the large arc) 2 forming the mouth and the back of the cabinet 1□ 1 passes through the center of the hole 4. It moves upward in the figure along the line a-a parallel to the line Since the hole 4 of the link plate 3 rotates around the center 0 of the hole 4 of the plate 3, the center C of the small circular arc 5 is also an arc bb45 centered on the center 0 of the hole 4. ° moving upwards along.

That is, the center C of the small arc is the rocker pin 1. which is attached back to back in the hole 4. A line O connecting the contact part T on the back of I
The rocker pin moves in a direction away from T, and the large arc 2 of the rocker pin touches the T, then moves on the X-X line, and the large arc 2
The center C of moves along the a-a line described above while maintaining a constant distance from the OT. 9 In this way, when bending in the direction of wrapping around the sprocket 71 or the boot, the center C of the plate 3 moves along the a-a line described above. The rocker pins 1, 1 move in the direction where the gap opens and can be bent. Then, the center C of the arc moves as described above, and the above-mentioned relationship continues until it reaches the position C' of the pair of lines where the a-a line intersects bb''!fA, and after that it cannot bend. become.

Next, when the link plate 3 bends in the opposite direction to the direction in which it wraps around the sprocket or pulley, contrary to the above,
The center C of the large arc 2 of the rocker pin 1 moves downward along the a-a line, and the center C of the small arc 5 tries to move downward along the bb line. The center C tends to move in a direction approaching the OT described above. On the other hand, since Rofukabin 1 can only move parallel to OT along the a-a line, link plate 3
Even if the link tries to bend in the opposite direction to the direction in which the link wraps around the sprocket or the boot, the rocker pin 1゜1 collides with the hole 4 of the link plate 3, making it impossible to move and bending. .

[Problem that the invention seeks to solve]

As mentioned above, conventional chains can be bent in the forward direction when the chain wraps around a sprocket or pulley, but cannot be bent in the opposite direction, which causes various problems. .

One of these is when a chain with very large torque fluctuations, i.e., rotational fluctuations, has a long center distance and requires slack, for example, the winding direction may be opposite to that of the force of a four-stroke engine. 6), in such a case, as mentioned above, the rocker pin 1 and link plate 3
A four-handed situation occurs between 0 and link plays 1 and 3 at this time.
The stress generated in the rocker pins 1 and 1 becomes extremely high.

The reason for this is explained with reference to Figure 12.The force F exerted on the back of the mouth/7 chain is expressed as FoCO5θ with respect to the resultant force F of the two forces F, and the chain bends. The moment is the force F acting on the back of the rocker pin.
It is expressed as the product of the amount of eccentricity e and the bending moment -Fe. This is because the amount of eccentricity e is extremely small, so F becomes large. This often results in damage.

If the tensioner 6 with a large radius R is used to press a chain with a large amount of slack, the radius R will become smaller at the end of the tensioner 6, as shown in FIG. That is, if the slack of a chain that cannot be reversed is increased, the radius R for reverse reversal becomes smaller, and only a very small amount of slack can be provided, reducing the degree of freedom in terms of layout. Also, when the chain stretches from the initial state II to state G as it is used, the tensioner 6 must be inserted all the way into the chain as shown in FIG. It is necessary to make the chain small, and a chain that cannot be reversed has a disadvantage in that the limit [11] for elongation is narrow and the service life is accordingly shortened.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a highly durable chain that allows bending of the chain in the rearward direction and avoids an unnecessary increase in chain tension.

In a silent chain or chain heald in which arc-shaped rocker pins are installed back-to-back in the rocker pin mounting holes of link plates, and the link plates are made freely bendable via the rocker pins, a large circular arc forming the back surface of the rocker pins. is smaller than the distance from the center of the large arc to the center of the rocker pin attachment hole, and the radius of the large arc that forms the back surface of the rocker pin and the radius of the small arc that forms the thickness of the rocker pin. The difference between
...The difference between the distance from the center of the large arc to the center of the rocker pin mounting hole and the radius of the large arc is made smaller, and the centers of both arcs are positioned almost on the same line as the pitch line of the chain. That is.

[Effect]

The present invention makes the radius of the large arc forming the back surface of the rocker pin smaller by ΔR than the distance from the center of the large arc to the center of the rocker pin mounting hole, and the large arc forming the back surface of the rocker pin. The difference between the radius of the circular arc and the radius of the small circular arc for forming the thickness of the rocker pin is also determined by the above Δ
Since R is made small and the centers of both arcs are located almost on the same line as the pinch line of the chain, the chain can be bent in the forward direction or in the reverse direction. If one of the bends in the opposite direction is larger, bending is possible by shifting the center of both arcs toward the one with the larger bend, and even if the swing is large in the opposite direction, the rocker pin and link plate This prevents collision with the formed rocker pin mounting hole (allows bending and prevents generation of excessive stress).

[Example] The present invention will be described based on an example shown in the drawings, and the same or equivalent members as those of the conventional device described above will be described using the same reference numerals.

In FIG. 1, rocker pin 1. 1, and the center CI of the small arc 5 that forms the thickness of the 07 cabin 1, 1 are placed almost on the same line as the pitch line 7 of the chain, and the radius R of the large arc 2 is , are made smaller than the distance between the center 0 of the rocker pin mounting hole 4 of the link plate 3 and the center of the large arc 2 by ΔR. Therefore, R and ΔR are the radii of the conventional large arc.

The difference is also smaller by ΔR.

The size of ΔR mentioned above is determined by calculating the bending angle as follows using the minimum radius required to bend in the reverse direction and the pitch radius of the minimum number of sprocket threads required to bend in the forward direction. , determined by the larger value.

In the forward direction, in the reverse direction, θ+'-5 inches p = Chain pitch r r: Minimum reverse warpage radius Use the larger value of θ9, 01' calculated as above (R, +ΔR) cosθ1yuR.

Find ΔR.

With the above configuration, when bent in the opposite direction, the center C1 of the arc can move along the m-n line up to CI', as shown in Fig. It becomes possible to bend by θ1, and the adjacent link play 1-
The relative bending angle is 2θ.

becomes.

Also, when wrapped around the sprocket or boob, the third
As shown in the figure, in the opposite direction to the above-mentioned case of the opposite direction, the center C, can be moved along the mn line up to C6'', and can be bent by θ1, so that the relative bending angle is 2θ1.

As mentioned above, when the center C1 of both circular arcs is located almost on the same line as the pitch line of the chain, the backward bending and the forward bending are almost the same degree, but if one of them is smaller , if the other is larger, the centers C2 of the two arcs are shifted by θ toward the larger bending, and for bending in the opposite direction, the radius R8 of the larger arc 2 is shifted toward the larger bending.
By making the distance between the center C2 of the link plate and the center IO:0 of the rocker pin mounting hole 4 of the link plate smaller by ΔR, bending is made possible, and this state is shown in FIG. Δ at this time
R is 2r from the minimum radius of curvature of the smaller bend
OCz cos θ1cos(θ1 +θ2).

θI: Off-cent angle θ2: Reverse bending angle, forward bending angle=2 (θ1 +θ2).

In addition, the chain line Y in FIG. 4 shows the state after bending in the opposite direction.

It does not lock even when exposed to high pressure and does not generate excessive stress, increasing durability.Also, since the back side can be bent freely, it is possible to operate other equipment on the back side. For example, as shown in FIG. 9, relatively light-load equipment such as an oil pump or a water pump 9 can be driven.

Furthermore, Fig. 10 shows an example in which the above-mentioned reverse warping chain of the present embodiment is applied to a chain belt used by being wrapped around a type pulley. The chain belt 10 has link play 1-11.11.11. A protrusion 12 is formed on the inner side when wrapped around the ■-shaped pulley of..., and the protrusion 1
A V block mounting hole is bored in 2, and a V block 13 that makes frictional contact with the ■-shaped pulley is mounted in the hole, and the link play 1-IL Ll, 11. A large number of .
■ Power is transmitted through frictional contact between the block 13 and the V-shaped boob IJ 9, but in the case of a chain belt, ■ the V-block 13 of the chain bell i.
It is necessary to reduce the amount of sulin 1 between the pulley and the pulley.

In other words, in order to increase the above-mentioned wrap angle, the chain belt has to be given an appropriate amount of slack. As a result, the slack generated on the non-drive side causes the chain belt 10 to automatically continue to wrap around the ■-shaped pulley, increasing the wrapping angle and making it difficult to slip. In FIG. 1O, 14 indicates the original wrap angle, and 15 indicates the increased wrap angle.

Also, depending on how the V-shaped pulley is controlled, the chain belt may become slack, and in this case, it may warp in the opposite direction as well, but the chain belt in this example does not lock even if it warps in the opposite direction, and is It is possible to improve the durability of the chain belt without generating excessive stress.

FIG. 11 shows another embodiment in which the rocker pins 16 and 17 each have an arc-shaped cross section in the longitudinal direction, with the small arcs 16' and 17' in the longitudinal direction being inside, and the large arc 1G
", 17" are installed in the pin hole 18 in a back-to-back configuration, and when the back-to-back configuration is established, each rocker pin 16.
A gap ΔR is provided between the rocker pins 16 and 17.
Depending on the height of the arc in the longitudinal direction, part or all of it is filled.

In this embodiment, even if the chain is bent or loosened, the gap between the rocker pins only increases or decreases, making it difficult to generate noise and to reduce the possibility of accelerating wear.

Furthermore, even when tension is suddenly applied to the chain, if the rocker pin is shaped in an arc in the longitudinal direction, the elasticity of the rocker pin acts to cushion the impact, increasing durability.

(Effects of the Invention) The chain according to the present invention has the advantage that if the radius of the large arc forming the back surface of the rocker pin having an arcuate cross section is smaller than the distance from the center of the large arc to the center of the rocker pin mounting hole. At the same time, calculate the difference between the radius of the large arc forming the back surface of the rocker pin and the radius of the small arc forming the thickness of the rocker pin as the distance from the center of the large arc to the center of the rocker pin mounting hole. Since the difference in the large arc was made small,
Since the chain can be warped backwards, it prevents excessive stress from occurring even if there is a reverse warp, increasing durability.Also, since the back side of the chain can be freely bent, it is lighter. It is possible to drive load equipment from the back.

Furthermore, when applied to a chain heddle, by giving the chain heald an appropriate amount of slack, the winding surface around the pulley can be made thicker, thereby reducing slip between the boot and the chain.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Figure 1 is an explanatory diagram of the case where a force is applied to the rocker pin of the chain, and Figure 2 is an illustration of the force applied to the rocker pin when the chain is bent in the opposite direction. FIG. 3 is an explanatory diagram of the state of the rocker pin when the chain of the present invention is wound around a sprocket, and FIG. 4 is an explanatory diagram of the state of the rocker pin when the magnitude of bending in the forward and reverse directions is different. FIG. 5 is an explanatory diagram of the state when tension is applied to the rocker pin mounted according to the present invention, and FIG. 7, 3, and 8 are explanatory diagrams of when a tensioner is applied to the chain, respectively. FIG. 9 is an explanatory diagram of driving other equipment using the back side of the chain. FIG. 11 shows another embodiment of the present invention; FIG. 11 is a cross-sectional view thereof, and FIG. 11 is a front view thereof. FIG. 12 is an explanatory diagram of a state in which a conventional rocker pin is attached. 1.1; 117 Capin 2: Arc forming the back surface of the rocker pin 3: Link plate 4: Link plate hole 5: Small arc Patent applicant Honda Motor Co., Ltd. Daido Kogyo Co., Ltd. 7.

Claims (3)

[Claims] (1) In a chain in which the convex back surfaces of a pair of rocker pins having an arcuate cross section are attached to rocker pin mounting holes of a link plate with the back surfaces in contact with each other, and the link plate is made freely bendable via the rocker pins. , the radius of the large arc forming the back surface of the rocker pin is smaller than the distance from the center of the large arc to the center of the rocker pin mounting hole, and the back surface of the rocker pin forming the wall thickness of the rocker pin is The difference between the radius of the large arc and the radius of the small arc to be formed is made smaller by the difference between the distance from the center of the large arc to the center of the rocker pin mounting hole and the radius of the large arc. A chain characterized in that it is positioned almost on the same line as a pitch line. (2) The chain according to claim 1, wherein the centers of both of the circular arcs are biased inside or outside the pitch line of the chain. (3) The chain according to claim 1 or 2, wherein the rocker pin has an arc shape in the longitudinal direction.