JPH0821488A - Assembly type transmission v-belt - Google Patents

Abstract

PURPOSE:To keep the clearance between a neck part and an endless band approach side edge to at least the demanded min. clearance without increasing a V-shaped block. CONSTITUTION:A V-belt 13 consisting of the endlessly connected arrangement bodies of a V-shaped block 14 and the bands 15 and 16 laid on the shoulder part 14b of the V-shaped block 14 is used by being laid between the pulleys. In the state shown on the figure where the center deflection quantity accompanied with the displacement of each movable flange of both the pulleys becomes zero. the initial clearance delta1 which is reduced because of the plus center deflection among the initial clearances delta1 and delta2 ranging from a neck part 14c to the band approach side edges 15a and 16a is determined to the sum 0.7mm of the plus center deflection max. value 0.2mm and the demanded min. clearance 0.5mm, and the other initial clearance delta2 is determined to the sum 1.3mm of the minus center deflection max. value 0.8mm and the demanded min. clearance 0.5mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled transmission V-belt used in a V-belt type continuously variable transmission.

[0002]

2. Description of the Related Art A V-belt type continuously variable transmission is generally disclosed in, for example, Japanese Utility Model Laid-Open No. 62-54343, and FIG.
The main parts are configured as outlined in. To be described on the basis of a main portion of the V-belt type continuously variable transmission in FIG. 6, the axis O _i
Pulley V groove 11 of input pulley 11 that is driven to rotate around
between the a and the pulley V groove 12a of the output pulley 12 rotated about the axis O _o parallel to the axis O _i.
A belt 13 is stretched around to configure. In such a configuration, the rotation of the input pulley 11 is transmitted to the output pulley 12 through the assembly type transmission V belt 13, and during this transmission, the movable flanges 11b and 12b of both pulleys 11 and 12 are axially moved as indicated by arrows A and B. In the same direction, the movable flange 11b is moved closer to the fixed flange 11c, and the movable flange 12b is moved away from the fixed flange 12c. Changes continuously, and continuously variable transmission can be performed.

Here, the assembly type transmission V-belt 13 will be described. Although it is conventionally described in the above-mentioned document, it is constructed as shown in FIG. 7, for example. That is, the pulley V groove 11
A large number of V-shaped blocks 14 each having an inclined end surface 14a that makes frictional contact with the side walls of a and 12a are provided, and these V-shaped blocks 14 are continuously arranged endlessly so as to form a V-belt. A pair of endless bands 15 and 16 are wound around the shoulders 14b at both ends of the V-shaped block 14, respectively. In addition, each endless band 15, 16
Is composed of a laminate of endless band elements. The V-shaped block 14 is further provided with a neck portion 14c arranged between the shoulder portions 14b on both sides, and an arm portion 14d extending from the neck portion 14c so as to face the shoulder portion 14b. V-shaped block 14 is an endless band 1
Try to prevent it from coming off from 5,16. In this assembly type transmission V-belt 13, the endless array of V-shaped blocks 14 is wound between the pulley V-grooves 11a and 12a of the input / output pulleys 11 and 12, as shown in FIG.

By the way, in the V-belt type continuously variable transmission, as described in Japanese Patent Application Laid-Open No. 61-65952, during shift control by the above-mentioned displacement in the same axial direction of the movable flanges 11b and 12b, The amount of movement of the center surface C _i of the pulley V groove 11a due to the axial displacement of the movable flange 11b and the amount of movement of the center surface C _o of the pulley V groove 12a due to the axial displacement of the movable flange 12b do not match, in some pulley between transmission ratio is aligned with the central plane C _i and the center plane C _o, these center plane C _i and C at the other pulley between transmission ratio
The position of _o shifts in the axial direction as shown by α in FIG. In this case, the V-shaped block 14 wound around the input pulley 11 and whose position in the groove width direction is determined by the pulley V groove 11a and the output pulley 12 are wound around the V-shaped block 14 and moved in the groove width direction by the pulley V groove 12a. The determined V-shaped blocks 14 also perform transmission operations in a state of being misaligned with each other.

An example of the relationship between the above-described misalignment amount α and the transmission ratio between pulleys is shown in FIG. This misalignment characteristic depends on the circumference of the V-belt, the axial distance between the input / output pulleys, the transmission ratio width between pulleys, and the transmission ratio between pulleys where the misalignment amount α becomes 0. Depends on. In FIG. 3, when the transmission ratio between pulleys is 0.7, the V-belt peripheral speed becomes the highest and durability is required. Therefore, when the transmission ratio is set, the misalignment amount α becomes 0. The characteristics are shown. Incidentally, the maximum speed transmission ratio is set to 0.4 and the minimum speed transmission ratio is set to 2.4.

[0006] In this case, when the transmission ratio between pulleys is changed at the transmission ratio between pulleys where the amount of misalignment α becomes 0, the misalignment in one direction is defined as a positive misalignment, and the misalignment in the other direction is reversed. If the misalignment is minus misalignment, the maximum plus misalignment amount is 0.2 mm, while the maximum minus misalignment amount is as large as 0.8 mm. The values are different from each other.

However, as shown in FIG. 7, the conventional assembly type transmission V-belt, including the case where the maximum values of the two-way center deviations are different from each other, as shown in FIG. The initial clearances δ ₁ , δ ₂ between the adjacent side edges 15a, 16a of the bands 15, 16 are the same (for example, 1 m
It was set to m).

[0008]

However, as described above, the neck portion 14c and the adjacent side edges 15a of the both endless bands 15 and 16,
The conventional configuration in which the initial clearances δ ₁ and δ ₂ with 16a are the same causes the following problems. This problem
A case where δ ₁ = δ ₂ = 1 mm and the misalignment characteristic is as shown in FIG. 3 will be described. 8 (a) is an initial clearance [delta] _1, of [delta] _2, the clearance changed status of initial clearance [delta] ₁ of smaller side by positive misalignment, when the positive misalignment becomes maximum 0.2mm In this case, the clearance is δ ₁ −0.2 mm = 0.
It drops to 8 mm. Further, FIG. 8B shows a clearance change state of the other initial clearance δ _{2 which} becomes smaller due to the negative misalignment, which is 0.
It is shown in the state when it becomes 8 mm, and the clearance at this time is δ
It drops to _{2 -0.8mm} = 0.2mm.

By the way, the neck portion 14c and both endless bands 1
As the clearance between the adjacent side edges 15a, 16a of the belts 5, 16 decreases, the neck portion 14c and the both endless bands 1
Contact with the adjacent side edges 15a, 16a of 5, 16 may damage the endless bands 15, 16 and may cause problems with the lack of durability and reliability of the V-belt. Incidentally, in the existing assembly type transmission V-belt, a clearance of at least 0.5 mm is secured, and this value is considered to be an index for the durability and reliability of the belt.

For the purpose of solving only this problem, at any transmission ratio between the pulleys that causes the maximum plus misalignment and the maximum minus misalignment, the gap between the neck portion 14c and the endless band adjacent side edges 15a, 16a is reduced. It is conceivable to reduce the width of the neck portion 14c or increase the size of the V-shaped block in order to increase the initial clearances δ ₁ and δ ₂ so that the clearance is less than the required minimum clearance. However, the former measure causes the strength of the neck part 14c to be reduced and the arm part 14d to be missing, resulting in a decrease in the durability of the transmission V-belt, and the latter measure actually increases the size of the transmission V-belt. It's not a drastic solution, such as unattractive.

The present invention provides a countermeasure different from the above.
Even at the transmission ratio between pulleys where the amount of misalignment is maximized, the clearance between the neck portion and the side edge near the endless band does not become less than the required minimum clearance, and the transmission V-belt does not cause the above-mentioned problems. The purpose is to improve the durability and reliability of the.

[0012]

To this end, a prefabricated transmission V-belt according to the first aspect of the present invention comprises a large number of V-shaped blocks each having an inclined end surface which makes frictional contact with the side wall of a pulley V groove.
The V-shaped blocks are continuously arranged in an endless manner so as to form a belt, and a pair of endless bands are provided around shoulders at both ends of these V-shaped blocks, and a neck portion between these shoulder portions faces the shoulder portion. Is an assembly type transmission V-belt, in which the V-shaped block is prevented from coming off from the endless band by the arm portion extended so as to be a pair of pulleys. The pulley V of these pulleys is wound around by using the assembly type transmission V belt.
It is possible to change the transmission ratio between the pulleys by displacing one of the flanges defining the groove in the same axial direction, and between the pulley V groove centers of the two pulleys caused by the displacement of the flange. In a V-belt type continuously variable transmission in which the amount of misalignment in one direction and the amount of misalignment in the other direction are different, between the neck portion and the adjacent side edges of both endless bands when the amount of misalignment is 0. Among the initial clearances between the two, the initial clearance that becomes smaller due to the misalignment in the one direction is determined to be the sum of the maximum value of the misalignment amount in the one direction and the required minimum clearance, and The initial clearance that becomes smaller due to the misalignment in one direction is determined to be the sum of the maximum value of the misalignment amount in the other direction and the required minimum clearance, and the initial clearances are made different from each other. To It is an butterfly.

The assembly type transmission V-belt according to the second aspect of the present invention has different initial clearances as described above.
The neck portion is offset.

[0014]

The assembled transmission V-belt according to the first aspect of the present invention has a large number of V-shaped members each having an inclined end surface that makes frictional contact with the side wall of the pulley V groove.
An endless array of mold blocks is wound around a pair of pulleys and used in a V-belt type continuously variable transmission. Here, the V-belt type continuously variable transmission is a continuously variable transmission in which one of the flanges defining the pulley V groove of the pulley is displaced in the same axial direction to change the transmission ratio between the pulleys. It can be performed.

During the axial displacement of the flange to be carried out during this gear shifting, the amount of misalignment in one direction between the centers of the pulley V grooves of both pulleys and the amount of misalignment in the other direction are different from each other. The V-shaped block whose width direction position is determined by the V groove also performs transmission operation in a misaligned state except for a specific transmission ratio between pulleys where the misalignment amount is zero. By the way, of the initial clearances between the neck portion and the adjacent side edges of both endless bands when the amount of misalignment is 0, the one that is reduced by the misalignment in the one direction is the one in the one direction. The maximum deviation is determined to be the sum of the required minimum clearance, and the initial clearance that is smaller due to the misalignment in the other direction is set to the maximum value of the misalignment in the other direction and the required minimum clearance. Since the initial clearance was determined to be the sum of the clearances and the initial clearances were different from each other, even in the transmission ratio between pulleys where the amount of misalignment in both directions becomes maximum, there is a difference between the neck and the end edge of the endless band. The clearance will not become less than the required minimum clearance, and the durability and reliability of the transmission V-belt will be reduced as the side edge near the endless band contacts the neck and is damaged. It is possible to eliminate that problem.

To solve this problem, as described above, the initial clearances between the neck portion and the adjacent side edges of both endless bands when the amount of misalignment is 0 are different from each other. It is possible to achieve the above-described effect of improving the durability and reliability of the transmission V-belt without enlarging the block.

Further, according to the second aspect of the invention, when the initial clearances are made different from each other as described above, the neck portion is offset, so that the action and effect described above can be obtained without reducing the width of the neck portion at all. Decrease in neck strength,
Therefore, it is possible to prevent the arm portion provided for preventing the V-shaped block from falling off from falling off.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an embodiment of an assembled transmission V-belt suitable for use in a V-belt type continuously variable transmission designed so that the misalignment characteristic is as shown in FIG. The same parts as are indicated by the same reference numerals.

The assembled transmission V-belt 13 has a pulley V-groove 1
A large number of V-shaped blocks 14 having inclined end faces 14a that frictionally contact the side walls of 1a, 12a (see FIG. 6), that is, the pulley flanges 11b, 11c, 12b, 12c, are continuously connected to form a V-belt. Arrange and prepare. Then, the shoulder portions 14 at both ends of these V-shaped blocks 14
A pair of endless bands 15 and 16 each of which is a stack of endless band elements is wound around b. Each V-shaped block 14 is further provided with a neck portion 14c arranged between the shoulder portions 14b on both sides, and an arm portion 14d extending from the neck portion 14c so as to face the shoulder portion 14b. Allows the V-shaped block 14 to be an endless band 1
The configuration is such that it is prevented from coming off from Nos. 5 and 16.

As shown in FIG. 6, the assembly type transmission V-belt 13 has an endless array of V-shaped blocks 14 and pulleys V of the input / output pulleys 11 and 12 in the V-belt type continuously variable transmission.
It is put between the grooves 11a and 12a for practical use. Here, the rotation of the input pulley 11 is transmitted to the output pulley 12 through the assembly type transmission V belt 13, and during this transmission, the movable flanges 11b and 12b of both pulleys 11 and 12 are axially moved as indicated by arrows A and B. By displacing the movable flange 11b toward the fixed flange 11c and moving the movable flange 12b away from the fixed flange 12c by displacing the movable flange 11b in the same direction, the winding arc diameter of the transmission V-belt 13 with respect to the input / output pulleys 11 and 12 can be reduced. It is possible to continuously change the speed by continuously changing the speed.

During the shift control by the above-mentioned displacement in the same axial direction of the movable flanges 11b and 12b, as described above,
The center plane C _i of the pulley V groove 11a and the center plane C _o of the pulley V groove 12a are aligned at a certain transmission ratio between pulleys, but at other transmission ratios between pulleys, they are misaligned as indicated by α. At this time, the pulley V is wound around the input pulley 11 and
The V-shaped block 14 whose position is determined in the groove width direction by the groove 11a and the V-shaped block 14 which is wound around the output pulley 12 and whose position is determined in the groove width direction by the pulley V groove 12a are also decentered from each other. It will be used for transmission in the state.

The relationship between the above-mentioned misalignment amount α and the inter-pulley transmission ratio is as shown in FIG. 3, that is, when the inter-pulley transmission ratio is 0.7, the misalignment amount α becomes 0. , The highest speed transmission ratio was set to 0.4, and the lowest speed transmission ratio was set to 2.4. Assuming that the maximum value of the positive misalignment is 0.2 mm and the maximum value of the negative misalignment is 0.8 mm when the ratio is changed, in this example, the transmission V-belt 13 is particularly configured as follows.

That is, as is apparent from FIG. 1 showing the state when the amount of misalignment α is 0, the side edges 15a, 16a of the endless bands 15, 16 which are close to the neck portion 14c in this state are close to each other. Initial clearance δ ₁ and δ ₂
Of the above, the initial clearance δ ₁ which becomes smaller due to the positive misalignment is the maximum value of the positive misalignment of 0.2 mm.
(See FIG. 3) and the required minimum clearance, for example, the sum of 0.5 mm and the above-mentioned 0.5 mm is determined, and the initial clearance δ ₂ which is smaller due to the above-mentioned negative misalignment is the maximum of the minus misalignment. Value 0.8 mm (See Fig. 3)
And the required minimum clearance of 0.5 mm, the sum is 1.3 mm, and the initial clearances δ ₁ and δ _{2 of} both are determined.
Different from each other. Then, in making the initial clearances δ ₁ and δ ₂ different from each other, the neck portion 14c is set to V
The special initial clearances δ ₁ and δ ₂ are set by offsetting the mold block 14 in the width direction (left and right direction in FIG. 1).

In this case, the width of the neck portion 14c is not reduced, and the above-mentioned structure is realized without lowering the strength. Therefore, the arm portion 14d is missing and the V-shaped block 1
It is possible to prevent the V-belt from being damaged such that 4 is dropped from the endless bands 15 and 16.

By setting the initial clearances δ ₁ and δ ₂ as described above, the following operational effects can be obtained. FIG. 2 (a) shows the state of the clearance change of the initial clearance δ _{1 which} becomes smaller due to the above-mentioned plus misalignment in the state when the plus misalignment reaches the maximum of 0.2 mm. δ ₁ −0.2 mm = 0.
It drops to 5 mm. Further, FIG. 2B shows a clearance change state of the initial clearance δ _{2 which} becomes small due to the above-mentioned negative misalignment, which is 0.
It is shown in the state when it becomes 8 mm, and the clearance at this time is δ
It drops to _{2 -0.8mm} = 0.5mm.

By the way, the neck portion 14c and both endless bands 1
The clearance between the adjacent side edges 15a, 16a of the Nos. 5, 16 does not become smaller than the required minimum clearance of 0.5 mm, and the neck portion 14c contacts the adjacent side edges 15a, 16a of the both endless bands 15, 16 with each other. By endless band 1
Problems related to lack of durability and reliability of the V-belt, such as breakage of the parts 5 and 16, can be solved.

In solving this problem, as described above, the initial clearances δ ₁ and δ ₂ between the neck portion 14c and the adjacent side edges 15a, 16a of both endless bands 15, 16 when the amount of misalignment is 0 are set. Since the V-shaped blocks 14 are made different from each other, it is possible to achieve the above-described effect of improving the durability and reliability of the transmission V-belt without increasing the size of the V-shaped block 14.

FIG. 4 shows an example of an assembled transmission V-belt suitable for use in a V-belt type continuously variable transmission having the misalignment characteristics set as shown in FIG. FIG. 5 is based on the idea that the V-belt traveling radius is the smallest and the large torque is transmitted when the transmission ratio between pulleys is 2.4, which is the minimum transmission ratio, and therefore the durability is to be maximized. Since the misalignment amount α is set to 0 at the transmission ratio, the plus maximum misalignment amount is 0.9 mm and the minus misalignment maximum amount is 0.
It became 1 mm.

In this example, as is clear from FIG. 4 showing the state when the amount of misalignment α is 0, the neck side 14c in this state is moved from the neck portion 14c to the near side edges 15a of the endless bands 15 and 16. , 16a initial clearance δ ₁ and δ ₂
Among them, the initial clearance δ ₁ which becomes smaller due to the positive misalignment is the sum of the maximum value of the positive misalignment of 0.9 mm (see FIG. 5) and the required minimum clearance, for example, 0.5 mm described above. Determined to be 4 mm, the initial clearance δ ₂ which becomes smaller due to the negative misalignment is the sum of the maximum value of the negative misalignment of 0.1 mm (see FIG. 3) and the required minimum clearance of 0.5 mm, 0.6 mm. The initial clearances δ ₁ and δ ₂ of the _two are made different from each other. And thus, the initial clearance δ ₁ ,
In making δ ₂ different, the neck 14c is also offset in the width direction of the V-shaped block 14 (left-right direction in FIG. 4) to set the special initial clearances δ ₁ and δ ₂ in this example as well.

Thus, the initial clearances δ ₁ and δ ₂
Even when the transmission V-belt set with is used in the V-belt type continuously variable transmission having the misalignment characteristic shown in FIG. 5, the initial clearance δ ₁ which becomes smaller due to the plus misalignment is 0 when the plus misalignment is maximum. The initial clearance δ ₂ which decreases to 0.5 mm and decreases due to the negative misalignment decreases to 0.5 mm at the time of the maximum negative misalignment, but neither clearance is less than 0.5 mm. The same operational effect as can be obtained.

[0031]

As described above, the assembly type transmission V-belt according to the first aspect of the present invention, as described in claim 1, has a gap between the neck portion and both endless band proximity side edges when the amount of misalignment between the pulley V-grooves is zero. Of the initial clearances, the one that becomes smaller due to misalignment in one direction is determined to be the sum of the maximum value of the misalignment in one direction and the required minimum clearance, and the other direction The initial clearance that is smaller due to the misalignment is determined to be the sum of the maximum value of the misalignment amount in the other direction and the required minimum clearance, and the above initial clearances are made different from each other. Even at the transmission ratio between pulleys where the misalignment is maximized, the clearance between the neck and the end edge of the endless band does not become less than the required minimum clearance. Durability of the transmission V-belt, such as damaged in contact with the neck and can be solved reliability problems decrease.

In solving this problem, as described above, the initial clearance between the neck portion and the side edges adjacent to both endless bands when the amount of misalignment is 0 is made different from each other. It is possible to achieve the above-mentioned effect of improving the durability and reliability of the transmission V-belt without causing any change.

In the assembly type transmission V-belt according to the second aspect of the present invention, as described in claim 2, when the initial clearances are made different from each other as described above, the neck portion is offset to obtain a desired structure. Therefore, the above-described effects can be obtained without reducing the width of the neck portion, and the strength of the neck portion can be prevented from being lowered, and thus the arm portion provided for preventing the V-shaped block from falling can be prevented from falling off.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an assembled transmission V-belt according to the present invention.

FIG. 2A is a half cross-sectional view showing a state of the V belt of the same example at the time of maximum plus misalignment, and FIG. 2B is a half cross section showing a state of the V belt of the same example at the time of maximum minus misalignment. It is a figure.

FIG. 3 is a diagram showing misalignment characteristics between input and output pulleys of a V-belt type continuously variable transmission suitable for using the V-belt having the configuration of FIG. 1.

FIG. 4 is a cross-sectional view showing another embodiment of the assembled transmission V-belt according to the present invention.

5 is a diagram showing a misalignment characteristic between the input and output pulleys of a V-belt type continuously variable transmission suitable for using the V-belt having the configuration of FIG. 4. FIG.

FIG. 6 is an explanatory diagram illustrating a main part of a V-belt type continuously variable transmission.

FIG. 7 is a cross-sectional view illustrating a conventional assembled transmission V-belt.

FIG. 8 (a) is a half sectional view showing a state of the V-belt at the time of maximum plus misalignment, and FIG. 8 (b) shows the same V-belt.
It is a half section view showing a state at the time of maximum minus core misalignment.

[Explanation of symbols]

11 Input pulley 12 Output pulley 13 Assembly type transmission V-belt 14 V-shaped block 14a Inclined end face 14b Shoulder 14c Neck 14d Arm 15 Endless band 15a Proximity side edge 16 Endless band 16a Proximity side edge δ ₁ Initial clearance δ ₂ Initial clearance

Claims (2)

[Claims] 1. A plurality of V-shaped blocks each having an inclined end surface that makes frictional contact with a side wall of a pulley V groove are continuously arranged in an endless manner so as to form a V-belt, and both ends of these V-shaped blocks are provided. A pair of endless bands are wound around the shoulders of the section, and the V-shaped block is detached from the endless bands by the arms extending from the neck between the shoulders so as to face the shoulders. And a pulley V groove of these pulleys, in which an endless array of V-shaped blocks is wound around a pair of pulleys and the assembly type transmission V belt is used. It is possible to change the transmission ratio between the pulleys by displacing one of the flanges defining the above in the same direction in the axial direction, and one between the pulley V-groove centers of both pulleys caused by the displacement of the flange. direction In a V-belt type continuously variable transmission in which the amount of misalignment and the amount of misalignment in other directions are different, an initial stage between the neck and the adjacent side edges of both endless bands when the amount of misalignment is zero. Of the clearances, the initial clearance that is smaller due to the misalignment in the one direction is determined to be the sum of the maximum value of the misalignment amount in the one direction and the required minimum clearance, and the clearance in the other direction is determined. The initial clearance, which is smaller due to the misalignment, is determined to be the sum of the maximum value of the misalignment amount in the other direction and the required minimum clearance, and the initial clearances are made different from each other. Assembled transmission V belt. 2. The assembled transmission V-belt according to claim 2, wherein the neck portion is offset when the initial clearances are made different from each other.