JPS6367443A - Assembling of transmission v-belt - Google Patents

Abstract

PURPOSE:To improve the yield of blocks by making a V-type block, which conforms to a reference length of an arbitrary section of an endless belt, as a reference rank, and then combining it with auxiliary ranks which are a pair of tolerences corresponding to it so that the total number of blocks become the required number of them. CONSTITUTION:A V-type block, which conforms to a reference length (Lb+alpha)/T, the sum of the perimeter Lb of an endless belt and its proper pre-load is divided by the required number T of the V-type block, is considered a reference rank Rv. In addition, a pair of ranks R(v+b) and R(v-b), which correspond to a pair of tolerances having a relation offsetting each other centering around the tolerance corresponding to the reference rank, are considered auxiliary ranks, and the goods in a large stock are selected. And further, the employment of the V-type blocks of each rank is prevented from concentrating in a specific rank, and a certain number N1 of the V-type blocks are taken out from the reference rank, and at the same time, each equivalent number of the V-type blocks are taken out from the auxiliary ranks which have the relation of a pair with each other so that the total number of blocks become the required number of them, and then, they are assembled. Thereby, the yield of V-type blocks as a whole can be improved.

Description

Detailed description of the invention A1 Objective of the invention The present invention relates to a method of assembling a transmission V-belt constructed by assembling blocks in tandem.

(2) Conventional technology Japanese Unexamined Patent Publication No. 58-24640 discloses that in order to adjust the tightening to the optimum value by subtracting the circumferential length of the endless band, that is, the endless belt member from the total plate thickness of the ■-shaped block, one A transmission V-belt is shown in which a V-shaped block is formed for adjusting the tightness margin, and the V-shaped block for adjusting the tightness margin can be removed from the transmission V-belt even if the transmission V-belt is in an assembled state.

(3) Problems to be solved by the invention When assembling the transmission V-belt, ■-shaped blocks are sequentially assembled onto the endless belt, and finally one V-shaped block for adjusting the tightness is used to adjust the tightness. In the conventional method of performing this, in order to deal with variations in the total thickness of the ■-shaped blocks other than the V-shaped blocks for tightness adjustment, V-shaped blocks for tightness adjustment of various thicknesses are used. It has to be prepared in advance, has a strong manual element, and the adjustment work is complex and requires a large number of man-hours, making it difficult to automate and improve productivity.

The relationship between the length of the endless belt member and the thickness of the V-shaped block will be explained below. In Fig. 1+11, if the circumferential length of the endless belt member 1 is Ll, and the preload tolerance when the endless belt member 1 is preloaded is d, then on the endless belt member 1 with this preload applied, When trying to assemble V-shaped blocks in a vertical arrangement, the V
There is no problem if the total length of the shaped block portion falls within the preload tolerance d1.

However, in general, as shown in Figure 2 (al), even if an endless belt member is manufactured so that the length of the endless belt member is Lo, dimensional errors occur during manufacturing, and a large number of samples are randomly selected. When extracted, the variation in the circumferential length of the endless belt member is within the design value.

The distribution is a normal distribution centered on . Similarly, as shown in Figure 2 (bl), even if the V-shaped block is manufactured so that the effective thickness in the front and back direction of the V-shaped block, that is, the plate thickness of the so-called ■-shaped block, is lO, the manufacturing When a large number of samples are randomly sampled due to the dimensional error, the variation in the effective thickness of the V-shaped block in the front-rear direction becomes a normal distribution centered on the design value I!0.

Therefore, as shown in FIG. 1 (2), the required number of endless belt members 1 is determined from the length of the endless belt member 1, which is preloaded within the preload tolerance d, on the endless belt member 1. When a block is selected at random from a large number of V-shaped blocks manufactured under the same design values and attempted to be assembled, the total length of the ■-shaped block portion 2 is the shortest L.
2 to the longest Lo+d2, and the magnitude of the variation d2 at that time becomes extremely large, exceeding the preload tolerance d1.

Therefore, for example, a ■ shape that fits an arbitrary section on an endless belt member whose circumferential length, especially the inner circumferential length, is divided by the number of required V-shaped blocks of an endless belt member that has been appropriately preloaded. Only the blocks are selected and assembled on the endless belt, and as a result, as shown in Fig. 1 (3), the overall length of the V-shaped block portion 2 varies within the range from the shortest length to the longest length Ls + ds. The size d is the preload tolerance d.

However, in this case, only square blocks with specific dimensional tolerances would be used, resulting in an inconvenience in that the yield of V-shaped blocks would be extremely poor.

In view of the above-mentioned circumstances, the present invention provides a high yield of ■-shaped blocks, easy adjustment in selection of V-shaped blocks with various dimensional errors, and automation of assembly work, thereby further improving productivity. The main purpose of this invention is to provide a method for assembling a power transmission belt that enables the following.

B0 Structure of the Invention (Means for Solving 11 Problems) According to the present invention, a certain number of V-shaped parts are formed on the endless belt member along the longitudinal direction of the endless belt member in accordance with the circumferential length of the endless belt member. A method for assembling a transmission V-belt configured by assembling blocks in tandem, wherein the V-shaped blocks are ranked according to the tolerance of their effective thickness in the front and back direction, and the circumferential length of the endless belt member is The rank to which a ■-shaped block that fits an arbitrary section on the endless belt member of the standard length obtained by dividing the sum of the sum of Paired ranks that are different from the standard rank and respectively correspond to pairs of tolerances that are in a mutually canceling relationship centering on the tolerance corresponding to the standard rank are used as auxiliary ranks,
A certain number of V-shaped blocks were taken out from the standard rank, and an equal number of ■-shaped blocks were taken out from the auxiliary ranks that were in a pairwise relationship so that the total number was equal to the required number. A method for assembling a transmission V-belt is obtained, which comprises assembling each V-shaped block onto the endless belt member.

(2) Function When assembling the transmission V-belt, first, the V-shaped blocks are ranked in advance according to the tolerance of their effective thickness in the longitudinal direction. Further, the reference length is obtained by adding the circumferential length of the endless belt member and the appropriate preload of the endless belt member and dividing it by the required number of V-shaped blocks, and any section on the endless belt member of this reference length is The rank to which the V-shaped block that conforms to belongs is defined as the reference rank. Furthermore, pairs of ranks that are different from the standard rank and correspond to pairs of tolerances that cancel each other around the tolerance corresponding to the standard rank are selected as auxiliary ranks. A rank with a relatively large amount of stock is selected as an auxiliary rank considering the stock status of shape blocks. Then, taking out a certain number of V-shaped blocks from the standard rank, taking into account the stock status of V-shaped blocks of each rank and taking care not to concentrate the use of V-shaped blocks only on the ■-shaped blocks of a specific rank. At the same time, equal numbers of V-shaped blocks are created from the auxiliary ranks that are in a pair relationship with each other.
The V-shaped blocks are taken out so that the total number is equal to the required number, and each of the taken out V-shaped blocks is assembled on the endless belt member to complete the assembly of the transmission belt.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

First, in Fig. 2 18), the circumferential length of the endless belt member is L.
If a large number of endless belt members are manufactured so that the number of belts is O, dimensional errors occur during manufacturing, and the variations in the circumferential length of these many endless belt members are normally distributed around the design value Lo. distribution. In the distribution curve of FIG. 2 fat, the height in the vertical axis direction indicates the number of endless belt members corresponding to the circumferential length of each endless belt member. Now, if one endless belt member is selected arbitrarily from among the many manufactured endless belt members and its circumference is Lb, then the length of the endless belt member with the circumference Lb is the design value. It is shorter than the reference value LO by Lo−Lb.

In the second opening), if a large number of V-shaped blocks are manufactured so that the effective thickness in the front-rear direction of the ■-shaped block, that is, the plate thickness of the so-called V-shaped block, is io, dimensional errors will occur during manufacturing. The effective thickness of these many V-shaped blocks in the front-rear direction, that is, the variation in the plate thickness of the so-called V-shaped blocks, has a normal distribution centered on the design value io. In the distribution curve of FIG. 2(b), the height in the vertical axis direction indicates the number of V-shaped blocks relative to the effective thickness of each V-shaped block in the front-rear direction. Therefore,
A large number of manufactured V-shaped blocks are ranked according to the dimensional tolerance of effective thickness in the front-rear direction.

Assuming that the appropriate preload of the endless belt member with a circumferential length of Lb is α, the V-shaped blocks are assembled and arranged in columns on the endless belt member with a total length of [, b+α. If the required number of V-shaped blocks at this time is T, then the length of the section on the endless belt member required for one V-shaped block is (Lb+α)/T. The length of this section is Lb+α
)/T is the reference length, and the reference length is (Lb+α)/
The effective thickness in the front and back direction of the V-shaped block that fits T is lv
shall be.

If the effective thickness in the front-back direction is 7! When the required number T of each V-shaped block is assembled onto the endless belt member using only v V-shaped blocks, the T V-shaped blocks are arranged on the endless belt member to which a preload is applied in just the right amount. but,
On the other hand, since only the ■-shaped block with an effective thickness lv in the front-rear direction is used, V with an effective thickness lv in the front-rear direction is used.
V-shaped blocks other than the V-shaped blocks remain as inventory, resulting in extremely poor yield.

Therefore, as shown in Fig. 2cb>, the rank to which the V-shaped block with the effective thickness lv in the front-rear direction belongs is set as the reference rank Rv, and the inventory of the V-shaped blocks in each rank is relatively large. Among the ranks, there is a rank different from the standard rank RV, and the tolerance j of the V-shaped block! o-j!
The tolerance 1o-(
j! A pair of ranks R(v+b) and R(v-b) corresponding to v+a) and 1o-(lv-a), respectively, are selected as auxiliary ranks, and a V-shaped block is selected based on the inventory status of the ■-shaped block of each rank. Taking out N6 V-shaped blocks from the standard rank Rv while taking into account that block usage is not concentrated only in the V-shaped blocks of a specific rank, we also take out N6 V-shaped blocks from the standard rank Rv and )from(
T-Nl)/2 pieces, that is, when Nl+N, = T, take out N2/2 blocks each and calculate these standard rank RV and auxiliary ranks R(v+b), R(v-b
) The V-shaped blocks taken out from ) are assembled onto an endless belt member whose circumferential length is Lb + α due to the addition of a preload with circumferential lengths l and b, thereby assembling a power transmission V-belt.

When assembling a transmission V-belt, if the V-shaped blocks are closely arranged adjacent to each other on the endless belt member, the above relationship according to the present invention can be summarized as follows: )/2 ・・・・・・・・・・・・・・・
......................................fl), and the transmission V-belt can be assembled by determining the optimum N1 so that equation (1) is satisfied.

Further, as shown in FIG. 3, each V-shaped block 49, 41
... have recesses 5, 6, 7.8, etc. on the front and rear surfaces, and using these recesses 5, 6, 7.8, etc., an intermediate member is inserted between each V-shaped block 4+, 4i... , for example, when a needle roller 9 is interposed, the V-shaped block 48.-i is produced with higher precision than the ■-shaped block 41.4- because the intermediate member such as the needle roller 9 is produced with higher precision than the ■-i-shaped block 41.4-. 42
The tolerance of the effective thickness l in the longitudinal direction of the intermediate member, that is, the tolerance of the diameter d of the needle roller 9 can be practically ignored. Therefore, in this case, the above formula (instead of 11, formula % formula %) can be applied.

Furthermore, in the present invention, a pair of auxiliary ranks R(v +
b), it is possible to assemble a power transmission belt by taking out the same number of ■-shaped blocks for each pair of auxiliary ranks from a plurality of pairs of auxiliary ranks, without worrying only about R (sea a).

C9 Effects of the Invention As described above, according to the present invention, the ■-shaped blocks are ranked according to the tolerance of their effective thickness in the front-rear direction, so it is easy to identify the V-shaped blocks of each tolerance level, and the endless The standard rank is the rank to which a V-shaped block that fits an arbitrary section on the endless belt member of the standard length obtained by dividing the value obtained by adding the circumference of the belt member and the appropriate preload by the required number of ■-shaped blocks belongs. The ranks that are different from this standard rank and that correspond to pairs of tolerances that cancel each other around the tolerance that corresponds to the standard rank are used as auxiliary ranks, so the ranks used can be rationalized. 8, a certain number of V-shaped blocks are taken out from the standard rank, and an equal number of V-shaped blocks are taken out from the auxiliary ranks that are in a pair relationship, so that the total number of blocks reaches the required number. Since the V-shaped blocks are taken out so that they are equal and assembled on the endless belt member, it is avoided to use only blocks with a specific tolerance, and the yield of V-shaped blocks is high. It is also easy to adjust the selection of V-shaped protrusions that have dimensional errors, and it is possible to automate the assembly work of the transmission V-belt, thereby further improving productivity.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the relationship between the circumferential length of the endless belt member and the circumferential length of the ■-shaped block part. (1) is a developed view of the endless belt member with respect to preload tolerance, and (2) is a variation in the overall length. Developed view of the ■-shaped block with large , (3)
Figure 2 is a developed view of a V-shaped block part with small variations in overall length and is within the preload tolerance range (al is a number distribution diagram centered on the reference value Lo of the circumference of the endless belt member, Figure 2) tb) is a number distribution diagram centered on the reference value 11o of the thickness in the front and back direction of V-shaped blocks corresponding to each rank, and Fig. 3 is a side view of the main parts of V-shaped blocks arranged with needle rollers as intermediate members. It is. 1...Endless belt member, 3.41-42...V-shaped block, 9...Intermediate member, Lb...Endless bell!・Perimeter of member, α...Appropriate preload, T...Required number of ■-shaped blocks

Claims (1)

[Claims] [1] This endless belt member (1) is placed on the endless belt member (1).
1) A certain number of V-shaped blocks (3, 4_1 to 4_2) according to the circumferential length of the endless belt member (1) are arranged along the longitudinal direction.
) are assembled in tandem to form a transmission V-belt, the V-shaped blocks (3, 4_1 to 4
The V
The standard rank is the rank to which a V-shaped block that fits an arbitrary section on the endless belt member (1) of the standard length obtained by dividing by the required number (T) of shaped blocks (3, 4_1 to 4_2) belongs. , Paired ranks that are different from this standard rank and correspond to pairs of tolerances that cancel each other around the tolerance corresponding to the standard rank are used as auxiliary ranks, and a certain number of items from the standard rank are While taking out the V-shaped blocks, take out an equal number of V-shaped blocks from the auxiliary ranks that are in a pairwise relationship so that the total number is equal to the required number,
A method for assembling a transmission V-belt, comprising assembling each of the V-shaped blocks (3, 4_1 to 4_2) taken out onto the endless belt member (1). [2] The section of the standard length on the endless belt member (1) includes one V-shaped block belonging to the standard rank and one intermediate member (9) interposed between each V-shaped block. The method for assembling a power transmission V-belt according to claim 1, wherein the sections are combined with each other and have matching lengths.