JPS5833425B2 - Transmission V-belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission belt used in a V-belt continuously variable transmission.

Examples of conventional power transmission V-belts include those shown in FIGS. 1 to 6.

FIG. 1 shows a generally known V-belt continuously variable transmission. In the figure, 1 is an input shaft, and 2 is a transmission V
The output shaft is transmitted via a belt 3, and a primary fixed pulley 4 is fixed to the input shaft 1. A pulley case 9 is attached to the input shaft 1 by a spline T so as to be slidable in the axial direction on the extension part 6, and whose outer periphery is slidably in contact with the inner surface 5a of the primary movable pulley 5 via a seal 8 in a fluid-tight manner. is tightened and fixed to the shaft end of the extension part 6 by a nut 10,
It is configured such that hydraulic pressure is introduced into the oil chamber 12 through an oil passage 11 formed in the extension part 6.

Further, a secondary fixed pulley 13 is fixed to the output shaft 2, and a secondary movable pulley 14, which works together with the secondary fixed pulley to constitute a secondary pulley on the driven side, is attached to the extension shaft 15 of the output shaft 2 by a spline 16 in the axial direction. A spring seat plate 17 is fixed to the shaft end of the extension shaft 15 with a nut 18, and a return spring 19 is interposed between the spring seat plate 17 and the secondary movable pulley 13, so that the secondary Movable pulley 1
8 is pressed toward the secondary fixed pulley 13.

Therefore, the V-belt 3 is the drive side primary boot IJ4
, 5 and driven-side secondary pulleys 13 and 14, and power is transmitted by the frictional force of the V-shaped side surfaces of the V-belt 3.

The gear ratio is such that when the thrust due to the hydraulic pressure of the primary pulleys 4 and 5 is greater than the thrust due to the spring force of the return spring 19 of the secondary pulleys 13 and 14 (V-belt clamping force), the V-belt 3 is balanced on the primary pulley side. On the other hand, the secondary pulleys 13 and 14 are pushed toward the inner circumference, decreasing the rotation radius and increasing the rotation radius by the primary pulleys 4 and 5. The speed of the output shaft 2 is increased, and the gear ratio is thus changed steplessly.

Figures 2 to 6 show -f11 of the conventional V-belt used in the above-mentioned continuously variable transmission, Figure 2 is a partial side view of the V-belt, and Figure 3 is a partial side view of the V-belt. The relationship with the V-shaped pulley is shown as a cross section on the -■ line, and FIGS. 4 to 6 show side views and sectional views of three types of flock plates.

As shown in FIG. 2, the V-belt has a plurality of belt blocks 20 a t 20 b .
1, and each belt block 2
As shown in FIG. 3, 0 a + 20 b... is composed of three types of block plates: a V-shaped block plate 22, 23 and a plurality of block plates 24, and the belt blocks 20 a are sequentially , 20b are mounted with the right and left sides reversed, and are connected by a roller pin 21.

Furthermore, as shown in FIGS. 4 to 6, each block play) 22, 23, 24 has connecting arms 25 protruding from both sides, each connecting arm is provided with a pin hole 26, and each belt As shown in FIGS. 4 and 5, the V-shaped block plates 22 and 23 located on both sides of the blocks 20a, 20b, . It is configured to come into contact with the pulley groove surfaces 29 and 30 at.

,. However, since such conventional power transmission V belts have a combination structure of V-shaped block plates 22, 23, a plurality of block plates 24, and roller pins 21, it is difficult to reduce the pin diameter and link shape. However, there is a limit, and the pitch interval of the roller pins cannot be made small, and the belt blocks 20a, 20b...
・Because there is a roller pin in between, the pulley groove surface 29.3
When the number of contacts with 0, that is, the contact area between the pulley and the V block is small as shown in the contact area G (see Figure 3) and large power is transmitted, the surface pressure becomes too high, resulting in poor durability. The problem is that the power transmission capacity is small, and in order to ensure durability, it is necessary to increase the diameter of the pulley.
The problem was that it was difficult to make a continuously variable transmission high-capacity, compact, and lightweight.

The present invention was made by focusing on the problems of conventional power transmission V-belts, and eliminates the link connection between pins and pin holes, and provides irregularities in the direction perpendicular to the shaped surface of the block. The purpose of this invention is to solve the above problems by making the pins function as pins and pin holes.

Hereinafter, the present invention will be explained based on the drawings.

7 to 13 show a first embodiment of the present invention, which is composed of two types of V-blocks 31 and 32 as shown in the drawings.

As shown in FIGS. 8, 10, and 11, the block 31 is a V-shaped block having an end face with an inclination angle that is the same or approximately equal to the V-groove angle θ formed by the groove surfaces 29 and 30 of the ■-shaped pulley. Two protrusions 3 have a shape that is divided into halves by a plane A perpendicular to the axis, and protrude on a pitch line P passing through the center of the height L of the V-shaped block and in a direction perpendicular to the plane A.
3 and 34, and ■block 32 is shown in FIG.
As shown in Figure 3, the V formed by the V-shaped pulley groove surfaces 29 and 30
A V-shaped block with both end faces inclined at the same taper angle as the groove angle θ has a hole 35 penetrating on the pitch line P and perpendicular to the orthogonal plane A, and the hole 35 of the ■block 32 is inserted into the hole 31 of the ■block 31.
Insert one protrusion 33 of another V-flock 31, then insert the other protrusion 34 of another V-flock 31 into the same hole 35, and connect sequential ■ blocks 31 and 32 in the same way until the predetermined length is reached. In this case, by combining the protrusions and holes at the end of the belt, an endless belt having one end face with an inclination angle corresponding to the V-groove angle θ can be obtained.

Furthermore, by inserting the protrusions 33 and 34 of the V block 31 into the holes 35 of the block 32 in the same manner as described above from the side opposite to the side where the protrusions 33 and 34 of the V block 31 are inserted, A V-belt with an end face having an inclination angle corresponding to the V-groove is completed.

■Protrusions 33 and 34 of block 31 are shown in Figures 7 and 10.
As shown in the figure, it has a cylindrical or semi-cylindrical shape, and on the other hand, the hole 35 of the block 32 has an elongated shape as shown in FIGS. 7 and 12.
are connected by rotating links.

In addition, the adjacent V-blocks 31 and 32 can be cut out on the pulley by cutting out the parts below the pitch line P, and in the case of the flock 31, including the back surfaces of the protrusions 33 and 34, for example, as shown at 36 in FIG. It is preferable to configure the V block so that it can rotate without interference even with a smaller turning radius than the minimum running radius of the V block.

On the other hand, the portion located above the pitch line 4 is made perpendicular to the pitch line P as shown by 37 to prevent the V-belt from warping to the opposite side. This prevents the strings from vibrating and making noise.

Also, the depth of the hole 35 of the block 32 is
■ Protrusions 33, 3 of block 31 inserted from both sides of
The length of V from the pulley is smaller than twice the length of 4.
When lateral pressure is applied to the belt, the protrusions 33 and 34 are brought into contact with each other as shown in FIG. 9, so that (1) the blocks 31 and 32 are prevented from coming into contact with each other on the sides.

In addition, each V block is provided with protrusions 36 and 37 on the non-interfering part with the adjacent block on a plane perpendicular to the center pitch line of the two rotating ring parts, to receive the lateral pressure of the pulley and to prevent contact with the goo. The area is increased, the contact pressure of the V-belt is reduced, the durable transmission capacity and transmission efficiency are improved, and noise is reduced.

Furthermore, in order to prevent the V-belt from disassembling, ■Block 3
Braze the abutting ends of the protrusions 36 and 37 of the non-interference part of the V block 31 inserted into the hole 35 of No. 2 from both sides,
It is preferable to join them together by fixing such as welding or gluing.

Next, the operation of the conductive V-belt having the above-described structure will be explained.

In the primary pulleys 4 and 5 shown in FIG. 1, the power input to the primary pulley due to the side pressure on the V-belt due to the pulley thrust is transmitted to the V-belt 3 as a frictional force, and furthermore, the power input to the primary pulley is transmitted to the V-belt 3 as a frictional force. ) and the side where the belt is pushed out (loose side) is transmitted to the secondary pulley side, and the power is transmitted to the pulley by the frictional force of the contact portion with the V-belt.

The transmission torque ratio or reduction ratio at this time can be changed steplessly by the V-belt running radius ratio of both pulleys.

For this reason, the V-belt is required to withstand large lateral pressure and large tension, and also to be flexible enough to accommodate a small V-belt scanning radius on the pulley.

The flexibility of the V-belt according to the present invention is obtained by connecting a fixed ring with a hole provided as a pin hole in the V-flock 32 and a protrusion provided integrally as a pin in the V-block 31. By providing one pin hole bulge instead of the conventional two pin holes, the V block rotating link spacing and pitch spacing can be reduced without compromising tensile strength, and even with a small running radius, more V The block makes contact with the boot, reducing the surface pressure caused by large lateral pressure, improving durability, transmission capacity,
Efficiency can be improved and noise reduced.

(2) Inside the block, lateral pressure is received by a protrusion provided at a portion that does not interfere with the adjacent V block, eliminating the influence of lateral pressure on the rotating link.

In addition, the pitch line connecting the rotating links should be set at 1/2 of the V-belt contact height, that is, at the center, and be aligned with the direction of the resultant force of the frictional force with the pulley to prevent unnecessary circuit moment from occurring in the flock. This improves the strength of the link and prevents belt vibration.

Also, if the hole of ■ block 32 is circular, V block 3
Since it is not possible to regulate 20 rotations, the hole is long and oval in shape.

14 to 20 show a second embodiment of the invention.

In the first embodiment described above, since the V-block has two integrated pin holes and a V-block integrated with a pin, the pin part of the block is cantilevered, which limits the improvement of tensile strength. Therefore, in the second embodiment, two types of V-blocks 41 and 42 are provided in which a pin hole is integrally provided and a protrusion is attached to the block as a pin part.
Holes 43 and 44 and protrusions 45 and 46 are provided in the blocks 41 and 42, respectively, and by fitting these together, a rotating link is formed between the pin and the pin hole, and the length of the cantilevered portion of the pin portion is shortened. and improves tensile strength.

In addition, in this second embodiment, the known silent pin link connection is applied, and the shapes of the pin and the pin hole are formed as shown in the drawings to prevent slippage during rotation of the link connection.
Changed to 6-speed rolling, reduced noise, increased durability of pinot part,
Transmission capacity, efficiency, etc. have been improved.

It goes without saying that the link connection using such silent pins and pin holes can be applied to the first embodiment described above at the same time.

As explained above, according to the present invention, the conventional two link holes are combined into one, and the link pin is integrally provided in the V block, thereby making it possible to reduce the rotational link spacing, that is, the pitch. Even with a small V-belt running radius, contact is made between the V-groove pulley and many blocks, increasing the power transmission capacity, lowering the contact surface pressure of the blocks, improving durability, and reducing the width of each individual block. This has the effect of reducing the impact sound and noise caused by the pulley.

[Brief explanation of the drawing]

Figure 1 is a diagrammatic longitudinal cross-sectional view of a conventional V-belt continuously variable transmission.
Fig. 2 is a partial side view of a conventional V-belt, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4a is a side view of the V-shaped block plate 22 shown in Fig. 3, Fig. 4b is I in Figure 4a.
5a is a side view of the other V-shaped block plate 23 shown in FIG. 3, and FIG. 5b is a sectional view taken along line V-IV.
6a is a side view of the block plate 24 shown in FIG.
7 is a partial side view of the power transmission V-belt according to the present invention; FIG. 8 is a sectional view taken along line 7 -
9 is a sectional view taken along the line IX-IX in FIG. 7, FIG. 10 is a side view of the V block 31 with a pin, and FIG.
A front view of the block 31, FIG. 12 is a side view of the V block 32 with pin holes, FIG. 13 is a sectional view taken along the xm-xm line in FIG. 12, and FIG. 14 is a transmission V block according to the second embodiment of the present invention. A partial side view of the belt, FIG. 15 is a sectional view taken along the line Xv-XV in FIG. 14, FIG. 16 is a sectional view taken along the line XVI-XVI in FIG. 14, and FIG. 17 is a side view of the V block 41 with pin. ,
Figure 18 is a sectional view taken along the line X--X in Figure 17, and Figure 19 is
The figure is a side view of the V block 42 with pin holes, and FIG.
9 is a sectional view taken along line XX→■ in FIG. 9. FIG. 1...Input shaft, 2...Output shaft, 3...
...Transmission V-belt, 4...Primary fixed pulley, 5°°°゛°"Primary movable pulley, 13.
....°Secondary fixed pulley, 14...Secondary movable pulley, 20a. 20b...Belt block, 21...
Roller pin, 22.23... ■ type block plate, 24... Block plate, 25...
... Connecting arm, 26 ... Pin hole, 29, 30.
... Pulley groove surface, 31 ... V block with pin, 32 ... V block with pin hole, 33.3
4... Protrusion, 35... Hole, 36, 37
...Protrusion, 41, 42...V flock, 43,44...hole, 45,46...
·protrusion.

Claims (1)

[Claims] 1. A drive and driven pulley having a V-groove shape, and a transmission V-belt that transmits transmission between these pulleys, so that the pulleys mutually automatically and steplessly change the groove spacing to steplessly change the reduction ratio. There are two types of transmission V-belts used in continuously variable transmissions: a pin-equipped V-block having two protrusions spaced apart in the front and rear of the V-groove direction, and a pin-hole V-block having one pin hole. V-blocks are arranged alternately, and the rear protrusions and front protrusions of the V-blocks with pins located before and after this V-block with pin holes are inserted into the pin holes of the V-block with pin holes, and are linked together. A transmission V-belt characterized by: