JPH03255247A - Belt for high load transmission - Google Patents

Abstract

PURPOSE:To reduce vertical and lateral movements and oscillation of block bodies by providing an upper protruding part on a head of the block body and a lower protruding part on the side lower than a taper beginning line of the body respectively, forming upper and lower shelf parts respectively in each position corresponding to the upper and lower protruding parts and engaging each block body together. CONSTITUTION:In the case of block bodies 20 overlapped each other, the engaging condition between an upper protruding part 40 and an upper shelf part 50 is made to set the bottom face 42 of the upper protruding part on the shelf face 52 of the upper shelf part. An interval (a) between the bottom faces of the upper and lower protruding parts is larger than an interval (b) between the upper and lower shelf faces to facilitate tilting of the block bodies 20. A clearance is provided between the side face 43 of the upper protruding part and a shelf face 52 and the upper protruding part 40 is housed in the upper shelf part 50 to restrict lateral movement of the block bodies 20. A lower protruding part 41 is positioned apart from the upper protruding part 40, and even though a clearance is provided between the lower protruding part 41 and a lower shelf part 51, oscillation of the block bodies 20 is kept small. Although large compressive force is imposed on a taper beginning line 1 of the rear block bodies, the line 1 bears the force at whole length to hardly generate wear.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-load power transmission belt, particularly to a high-load power transmission belt used in vehicles such as automobiles and various mechanical transmission devices.

(Prior Art) Conventionally, power transmission systems for high-load transmission belts are generally classified into two types: push transmission and tension transmission.

Among them, the push transmission type has a structure in which a plurality of block bodies are attached to an endless multilayer steel band in contact with each other, and these block bodies can be slid, for example, as disclosed in U.S. Patent No. 3,720,113. It is disclosed in the specification etc. This transmission system generally has a structure in which the blocks are not fixed to the band, but are arranged so that they can slide on the band. When the blocks are applied to both the driving and driven pulleys, the blocks gather on the loose side. The driven pulley is rotated by pushing the blocks that are gathered on the loose side of the blocks hanging on the drive pulley.

However, in conventional belts using a push-transmission method, multiple block bodies are not connected to each other, but are individually attached to be able to slide on the band. When introducing the blocks separately, a means to regulate and align the positions of each block was required. A belt that satisfies this requirement is disclosed in Japanese Patent Publication No. 57-5854.3.
Alternatively, as disclosed in Japanese Patent Publication No. 55-100443, the protrusions provided on the surface of each block body are accommodated in guide grooves provided on the back surface of the adjacent block bodies, thereby performing self-alignment. Ta.

(Problem to be Solved by the Invention) However, when the block body used in such a belt rotates on the boot, it inclines in a direction in which it separates from the rear block body according to its curvature.

At this time, interference between the protrusion provided on the block body and the guide groove is unavoidable, and the protrusion is accommodated in the guide groove with a clearance between the protrusion and the guide groove. Therefore, there was a problem in that adjacent block bodies were loose and difficult to align correctly.

Furthermore, when the block body is wound around the boot, the protrusion may come off the guide groove due to a slight inclination of the block body. The block body that rotates on the boot in such a state will detach from the boot and overlap the block body in front, but at this time, the protrusion may not be accommodated in the guide groove, and there is a risk that the block body will not be aligned. there were.

Furthermore, a major problem was that the block objects could swing. That is, even if one protrusion of the block body is accommodated in a groove located at a corresponding position, the block body swings around this protrusion as an axis.

As an improvement to this, the first protrusion is provided on the head of the block body, and the second protrusion is provided on the taper start line, which is the pitch line when the block body rotates on the boot, and on the other side. proposed a block body having grooves at positions corresponding to such protrusions. For example, JP-A-6
This is the block body disclosed in Japanese Patent No. 4-15554.

This block body has the feature that the two protrusions are accommodated in the groove, and the deflection of the protrusions is reduced.

However, the two protrusions are located at the center of the head and on the taper start line, respectively, and the distance between them is relatively small.

Therefore, in order to reduce the runout of the block body, it is necessary to reduce the clearance between the protrusion and the groove, but in reality, in order to fit the protrusion into the groove without interference, the clearance between the protrusion and the groove must be reduced. Large clearance must be provided.

That is, when the distance between the two protrusions becomes smaller, the block body swings by the clearance Δl between the protrusion and the groove located on the taper start line, using the protrusion located in the center of the head as the rotation axis. The deflection angle of the block body is determined by the distance between the two protrusions and the clearance l.

Also, when these block bodies enter the boori,
The taper start line of the rear block body was inclined while applying a large compressive force, and the taper start line having the protrusion carried this compressive force in the area excluding the protrusion. Localized fatigue and wear occurred in this area.

The present invention addresses and improves the above-mentioned problems by reducing the vertical and horizontal movements and rocking of the block body, ensuring the self-alignment function of the block body, and preventing localization of the block body. The purpose is to prevent physical fatigue and wear.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that a head is formed on the block main body via a pillar,
A high-load power transmission belt including a plurality of block bodies each having a slot portion between the main body and the head, and an endless band hung through the slot portion, wherein an upper protrusion is provided on the head of each block body; , upper and lower protrusions are also provided at positions spaced downward from the taper start line provided on the main body, step-like upper and lower shelves are formed at positions corresponding to the upper and lower protrusions, and the upper and lower protrusions are arranged as shelves. Each block body is engaged with each other so that it can be installed on the upper and lower shelf surfaces of the section.

Further, the upper and lower protrusions can be provided on one side of the block body, and the stepped upper and lower shelves can be provided on the other side, and the upper protrusion and the stepped lower shelf can be provided on one side of the block body. Additionally, a stepped upper shelf and lower protrusion may be provided on the other surface. The stepped shelf portion may have a shape with one side open, and the stepped shelf portion may also be curved or straight M-shaped.

(Function) An upper protrusion and a step-like upper shelf are provided on the front and back surfaces of the block head, and a lower protrusion and a lower protrusion are also provided at a position downwardly away from the taper start line provided on the main body. A step-like lower shelf is provided, and the block bodies engage with each other such that the upper and lower protrusions can be installed on the upper and lower shelves. Therefore, even if each block body attempts to move in the vertical direction, the two protrusions provided on the block body interfere with the shelf, and this movement is restricted.

Furthermore, the swinging of each block body is reliably regulated since the upper and lower protrusions are in contact with the upper and lower shelves.

In particular, in the present invention, the two protrusions are provided at positions spaced apart below the top of the block head and the taper start line of the main body, and the distance between them is larger than in the prior art. Therefore, if the upper protrusion is in reliable contact with the upper shelf and the lower protrusion is engaged with the lower shelf with a clearance Δl, the block body will be centered around the upper protrusion, Although the lower protrusion swings until it touches the shelf surface, the swing angle of the block body is smaller than when the lower protrusion is on the taper start line and there is the same amount of clearance between the protrusion and the shelf. becomes smaller. In the case of the present invention, even if there is a clearance between the lower protrusion and the lower shelf,
To reduce the deflection angle of a block body, to reduce rattling, and to install the block body without interfering with a shelf part.

Furthermore, especially when a block body enters into a corner and tilts, the taper start line of the block body will receive a large compressive force, but the taper start line without a protrusion will receive a large compressive force from other block bodies. It supports sufficient compressive force and is less likely to cause local fatigue or wear.

In addition, even if the upper protrusion comes off the upper shelf when the block body enters the boob and is tilted in the direction of separating from the rear block body, the lower protrusion is always installed on the lower shelf and is free from the booze. The alignment of the blocks when leaving is ensured.

Furthermore, when the shelf provided on the block body is shaped with one side open, lubricating oil can freely enter and exit the shelf, reducing wear on the part.

(Examples) Examples of the present invention will be further described below with reference to the accompanying drawings.

The high-load transmission belt 1 shown here is constructed by arranging a plurality of block bodies 20 so as to be slidable on an endless test band 30, for example, a multilayer steel band.

Each block body 20 used here includes a main body 22 having an inclined end surface 21 that comes into contact with the V-pulley wall surface, a pillar 23 located at the center of the shaft, and a pair of endless bands 30 that hang around a chevron-shaped head 24. A slot portion 25,
In addition, the main body 22 has a tapered surface 26f downward from the taper start line l on the front side! : The block body rotating on the boob can tilt in the direction of travel according to its curvature.

Incidentally, the pitch line P is a line along which the block body 20 rotates on the pulley, and becomes a taper start line 1 where the thickness of the body starts to decrease.

A U-shaped block-shaped upper protrusion 40 is provided at the top of the block head 24, protruding from the surface.
Further, an upper protrusion 41 having the same shape as the upper protrusion 40 is formed at a position further down and away from the taper start line 1 of the block main body 26. The upper and lower projections 40
．． 41 is located on the center line of the block body, and the bottom surface 42
consists of a part of a circular arc surface with a radius of curvature r.

On the other hand, on the back side, stepped upper and lower shelves 50.51 are provided at positions corresponding to the upper and lower projections 40.41, and the shelf surface 52 is U
It is curved in the shape of a letter and one side is open.

Upper protrusion 40 when each block body 20.20 overlaps
When engaged with the upper shelf 50, the bottom surface 42 of the upper protrusion is installed on the shelf surface 52 of the upper shelf, as shown in FIG. In this case, the distance a between the bottom surfaces of the upper and lower protrusions is slightly larger than the distance between the upper and lower shelf surfaces, making it easier for the block body 20 to tilt. There is a slight clearance between the side surface 43 of the upper protrusion and the shelf surface 52, and the upper protrusion 40
is accommodated in the upper shelf part 50 with a margin, and the block body 20
The left and right movement of is also regulated. Further, the upper protrusion 41 is located away from the protrusion 40, and the upper protrusion 41 is located at a distance from the protrusion 40.
Even if there is a clearance between 1 and the lower shelf part 51,
The swing of the block body 20 becomes smaller.

Moreover, when the block body 20 enters the pulley, the block body 20 engaged with the boolean is tilted away from the rear block body head 24, and the front block body 20 is aligned with the taper start line of the rear block body. It tilts while coming into pressure contact with the surrounding area. The taper start line I of the rear block body receives a larger compressive force than the front block body 20. In the block body of the present invention which does not have the lower protrusion 41 on the taper start line 1, the taper start line 1 carries compressive force over its entire width, and local fatigue or wear that occurs conventionally is less likely to occur.

Further, even if the upper protrusion 40 comes off the upper shelf 50 when the block body 20 enters the boob and tends to separate from the rear block body 20, the upper protrusion 41 is always attached to the lower shelf. 51, the alignment of the block body 20 will not be disturbed when it is removed from the bobbin.

In addition, the lubricating oil can easily enter and exit from the open areas of the upper and lower shelves 50, 51, thereby reducing wear on these parts.

Furthermore, by making both the shelf surfaces 52 of the upper and lower shelves and the bottom surfaces 42 of the upper and lower protrusions tapered, the upper and lower protrusions 4
0.41 can be easily installed on the upper and lower shelves 50.51.

Note that the upper and lower projections 40 provided on the block body 20.
The amount of protrusion 41 is smaller than the depth of the upper and lower shelves 50.51. This is because when the respective block bodies 20 overlap, the block body head 24 and the pillar 23 come into surface contact and enable effective pushing transmission.

5 to 7 show a block body according to a second embodiment of the present invention, and according to the block body 20, the top of the block body head 24 and the main body 22 have U as in FIG. Although upper and lower projections 40, 41 in the shape of a letter are provided, the intervals between them are large. On the other hand, stepped upper and lower shelves 50.51 are provided on the back surface at positions corresponding to the upper and lower protrusions 40.41, and the shelf surface 52 is approximately triangular and one side is open.

In this block body 20, when the upper and lower protrusions 40.41 and the upper and lower shelves 50.51 are engaged, the block body 20 is moved so that the upper protrusion 40 is connected to the upper shelf 50 of the adjacent block body, as shown in FIG. On the other hand, due to the clearance generated between the lower protrusion 41 and the lower shelf 51, the upper protrusion 41 is installed without interfering with the lower shelf 51. Furthermore, the distance d between the upper and lower protrusions 40 and 41 is designed to be large, and even if there is a clearance between the upper protrusion 41 and the lower shelf 51, the block body 20 with the upper protrusion 40 as an axis is The runout is small and within the permissible range. Therefore,
If the clearance between the upper projection 41 and the lower shelf 51 becomes smaller, the swing of the block body 20 will be further reduced, and the swing accuracy can be improved. In the present invention, the allowable range of the deflection angle θ of the block body 20 is 16 at maximum.

Furthermore, FIGS. 8 to 10 show a third embodiment of the present invention, and in the block body 20 of this embodiment, an upper protrusion 40 is formed on one surface of the block body head 24.
A thick, plate-like base portion conforming to the shape of 4 is formed, and the bottom surface 42 of this base portion is a straight plane and extends to both side surfaces 28 of the head.

Note that the plate-shaped platform does not need to match the shape of the head 24, and the platform bottom surface 42 does not need to reach both side surfaces 28 of the head.

Further, at a position away from the taper start hole of the block main body 22, that is, near the bottom surface of the main body 22, a 0-shaped upper protrusion 41 is provided that protrudes from the surface.

On the other hand, the other surface of the block head 24 is provided such that a stepped upper shelf 50 is located at approximately the same height as the bottom surface 42 of the projection 40, and the shelf surface 52 reaches both side surfaces 28 of the head. ing. Furthermore, the block main body 22 has a lower shelf portion 51.
is provided at a position corresponding to the upper protrusion 41.

When such block bodies 20 overlap each other, the upper and lower protrusions 40.41 of one block body can be installed on the upper and lower shelves 50.51 of the rear block body. In the high-load power transmission belt of this embodiment, the block bodies 20 are in full contact with the adjacent block bodies 20 in the entire area above the taper start line l, and sufficient pushing and transmission is performed.

Furthermore, the block body 20 shown in FIGS. 11 and 12 is
This is a fourth embodiment of the present invention, and the block head 24 is
The main body 22 has a pair of left and right upper protrusions 40, 40, and one upper protrusion 41. On the other hand, on the back side, a pair of left and right stepped upper shelves 50, 50 and a lower shelf 51 are provided.
are provided at positions corresponding to the upper and lower protrusions 40.41. Other than that, the configuration is similar to that of the first embodiment, and the same effects as those of the first embodiment can be obtained.

(Effects) According to the present invention, the upper protrusions provided on the front and back surfaces of the block head can be installed on the upper shelf, and the upper protrusions can be installed on the part located below the taper start line 1 of the main body. Since the upper protrusion is in a state where it can be installed on the lower shelf, the movement of each block body in the vertical and horizontal directions is restricted, and since the upper protrusion is located away from the upper protrusion, In addition, swinging of the block body, that is, rocking of the block body about the upper protrusion is also restricted. In particular, the present invention is designed so that the distance between the upper and lower protrusions is large, and even if there is a slight clearance between the upper protrusion and the lower shelf, it is effective in reducing the deflection of the block body.

Furthermore, there is no upper protrusion on the taper start line 1, and the vicinity of the taper start inn i, which is subjected to the greatest compressive force, has a structure that can cope with this, and has the effect that local fatigue or wear is less likely to occur.

Moreover, even if the block body enters the boob and tilts in the direction of separation from the rear block body and the upper protrusion comes off from the upper shelf, the engagement between the upper protrusion and the upper shelf is maintained. This ensures that the block bodies overlap each other when they are separated from the pulley.

When one of the shelves provided on the block body is formed to be open, lubricating oil can freely enter and exit therein, reducing wear on that part.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a high-load transmission belt according to the present invention;
2 is a perspective view of the block body used in the high-load power transmission belt shown in FIG. 1, FIG. 3 is a perspective view of the block body shown in FIG. 2 seen from another side, and 4. The figure is a partially enlarged plan view of the block body showing the state in which the upper protrusion is installed on the upper shelf, FIG. 5 is a perspective view of another block body used in the high-load transmission belt of the present invention, and FIG. 6 is a perspective view of the block body shown in FIG. 5 viewed from another side, and FIG. 7 is a plan view of the block body when the block bodies shown in FIGS. 5 and 6 are stacked in the longitudinal direction of the belt. , FIG. 8 is a perspective view of another block body used in the high-load transmission belt of the present invention, FIG. 9 is a perspective view of the block body shown in FIG. 8 viewed from another side, and FIG. FIG. 10 is a partially cutaway side view of a high-load transmission belt using the block body shown in FIGS. 8 and 9, FIG. 11 is a perspective view of another block body according to the present invention, and FIG. 12 is a FIG. 12 is a perspective view of the block shown in FIG. 11 when viewed from another side. 1...High load transmission belt 20...Block body 22...Main body 23...Pillar 24...Head 30...Endless band 40.41...Upper and lower projections 42... Bottom surface 50.51... Upper and lower shelves 52... Shelf surface

Claims (1)

[Claims] 1. A head is formed on the block body via a pillar,
A high-load power transmission belt including a plurality of block bodies each having a slot portion between the main body and the head, and an endless band hung through the slot portion, wherein an upper protrusion is provided on the head of the block body; A lower protrusion is also provided at a position farther downward than the taper start line provided on the main body, and stepped upper and lower shelves are formed at positions corresponding to the upper and lower protrusions, and the upper and lower protrusions are connected to the upper and lower shelves. A high-load power transmission belt characterized by engaging each block body in a state where it can be installed on a shelf surface of a section. 2. The high-load power transmission belt according to claim 1, wherein the block body has upper and lower protrusions on one side, and has stepped upper and lower shelves on the other side at positions corresponding to the upper and lower protrusions. . 3. One side of the block body has an upper protrusion and a stepped lower shelf, and the other side has a stepped upper shelf and lower protrusion at positions corresponding to the upper protrusion and lower shelf, respectively. The high-load transmission belt according to claim 1, comprising: 4. The high-load power transmission belt according to claim 1, wherein the step-like shelf portions provided on the block head and the main body have one side open. 5. Claim 1, wherein the stepped shelf has a curved shelf surface.
Or the high load transmission belt according to 4. 6. Claim 1, wherein the stepped shelf has a linear shelf surface.
High load transmission belt as described.