JPH02163544A - Endless transmission belt - Google Patents

Abstract

PURPOSE:To prevent the slip-off of a pin by providing the pin for connecting a number of link pieces in the belt lengthwise direction and arranging a pair of pin retainers which contact the right and left edges and nipping the pair of retainers from inside a belt by a clip and engaging the both edges of the clip onto the outside part of the link piece. CONSTITUTION:When a belt is revolved, a centrifugal force is applied onto a pin retainer 8, which is positioned in the radial direction by the insertion part 8b, and positioned in the peripheral direction by the step difference between the pin contact part 8a and the insertion part 8b. Therefore, even if the above- described centrifugal force is applied, the slip-off of the retainer 8 is prevented, and the slip-off of the pins 5 and 5 is prevented. Further, since a clip 9 is inserted from inside, the direction of the centrifugal force applied onto the clip 9 becomes opposite to the direction of slip-off of the clip 9, and the slip-off of the clip 9 by the centrifugal force is prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in vehicles such as automobiles. This invention relates to an endless belt for transmission of a continuously variable transmission that performs continuously variable speed by changing the radius of the frictional engagement position of the transmission.

[Background Art] Continuously variable transmissions have been developed for automobiles in order to facilitate driving and provide a comfortable driving feeling.

As one such continuously variable transmission, a belt type continuously variable transmission using an endless belt is considered. This belt-type continuously variable transmission is constructed by connecting an input pulley disposed on the output shaft side of a starting device and an output pulley disposed on the output shaft side of the transmission by an endless belt. Continuously variable speed is achieved by appropriately controlling the frictional engagement position between each pulley and the endless belt to continuously change the gear ratio.

As one type of endless belt used in such a belt-type continuously variable transmission, for example, as shown in JP-A-63-115939, a large number of flat plate-like belts that frictionally engage with a person and an output pulley are used. It consists of a block, a large number of link pieces that pass through holes in the block and are connected endlessly by pins, and a removal prevention member that prevents the pins from being pulled out from these link pieces. be.

In such an endless belt consisting of a large number of blocks, power is transmitted from the input pulley to the block piece that frictionally engages with the input pulley during power transmission, and the power transmitted to the block piece is transferred to the pin, link piece, and output pulley. The signal is transmitted to the output pulley via a frictionally engaged block. In that case, continuously variable speed can be achieved by appropriately controlling the rotation radius of the engagement position of the input pulley and block and the rotation radius of the engagement position of the output pulley and block. It has become.

By the way, in one of the endless belts shown in this publication, a large number of link pieces are sequentially connected with pins to form a belt shape, and both ends of this belt shape are connected with specially shaped link pieces. and pins are used to connect them. In this case, after the pin is press-fitted into the hole of this link piece, the end of the pin is caulked to prevent the pin from being removed.

Further, in another example of the above-mentioned publication, the pin is prevented from being pulled out by using a pin fall prevention member consisting of an arm plate and a holding plate. That is, after the left and right ends of the pin are locked in recesses temporarily formed in the pair of arms, the arm plates are held in the width direction by inserting the holding member from the outside of the endless belt. Therefore, the arm plates position the pins and link pieces in the radial and circumferential directions of the belt, and the holding plates position the pins and the link pieces in the belt width direction.

[Problems to be Solved by the Invention] However, such a structure for preventing pin removal has the following problems.

In the former example, the pin is usually hardened by heat treatment such as carburizing, quenching, and tempering, but in order to caulk the pin, both ends of the pin are hardened by applying a carburizing inhibitor. I'm trying to avoid that. For this reason,
Both ends of the pin tended to lack strength and were not sufficiently durable.

Further, when press-fitting and caulking the pin, it is necessary to maintain extremely high dimensional accuracy of the pin and the dimensional accuracy of the hole in the link piece. For this reason, productivity could not be said to be good.

On the other hand, in the latter example, the ends of the pins cannot be made to protrude sufficiently beyond the link rows due to constraints between the belt width and the width of the link rows. Therefore, the engagement between the pin and the recess in the arm plate becomes insufficient, and there is a risk that the arm plate may fall off due to centrifugal force when the belt rotates. In particular, since the retaining plate is designed to hold the arm plate from the outside of the link row, the direction of the centrifugal force applied to the retaining plate coincides with the direction in which the retaining plate falls off, so there is a risk of the arm plate falling off. It is even higher.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an endless belt for power transmission that can reliably prevent pins from falling off.

Another object of the present invention is to provide an endless belt for power transmission that can improve the durability of the pins.

[Means for Solving the Problem] In order to solve this problem, the invention of claim 1, for example, as shown with reference to FIG. 1, an endless belt (1) has multiple link pieces (4) Pin (5) that connects the belt in the longitudinal direction
A pair of pin retainers (8) are arranged so as to abut on both the left and right ends of this pin (5), respectively, and these pair of pin retainers (8) are connected to an endless belt (
1) Almost U-shaped clip (9) attached from the inside
It is characterized in that both sides of the clip (9) are held by the outer portions of the link piece (4).

Further, in the invention of claim 2, for example, as shown with reference to FIG. An insertion part (8b) inserted into the hole (4C1) of the link piece (4C) between the pair of pin contact parts (8a, 8a)
), and furthermore, the insertion portions (8b) of the left and right pin retainers (8) are held between the clips (9).

Furthermore, the invention according to claim 3, as shown with reference to FIG. 8, for example, the input/output pulley is supported by a link piece (4C) to which the pin (5), which is prevented from falling off by the pin retainer (8), is connected. block (2) that frictionally engages with the block (2);
Vibration absorbing member (6) that suppresses vibration of this block (2)
-) is attached.

[Operation and effects of the invention] The endless belt (1
), a pair of pin retainers (8, 8) that are locked to both ends of the pin (5) are held by a U-shaped clip (9) inserted from inside the endless belt (1). Therefore, even if centrifugal force is applied to the clip (9), the direction of the centrifugal force is opposite to the direction in which the clip (9) falls off, so the clip (9) does not fall off and the pin (5) will be securely locked.

Further, according to the invention of claim 2, the insertion portion (8b) of the pin retainer (8) is inserted into the hole (4c +) of the link piece (4c), so that it is reliably positioned in the radial direction. Become. Further, since a step is formed between the pin contact portion 8a and the insertion portion 8b, the pin retainer (8) can be reliably positioned in the circumferential direction by this step. Therefore, even if centrifugal force is applied to the pin retainer (8) during rotation of the endless belt (1), the pin retainer (8) can be reliably prevented from falling off.

Furthermore, according to the invention of claim 3, since the vibration absorbing member (6') is attached to the block (2) that frictionally engages with the pulley, it is possible to effectively suppress vibrations generated in the block (2) itself. It becomes like this.

In any of the above-mentioned inventions, the pin (5)
Since the pin (5) is not caulked, there is no need to reduce the hardness of both ends of the pin (5). Therefore, the strength of the pin (5) does not decrease, so the durability of the pin (5) is improved.
2.

Note that the symbols in parentheses are for contrast with the drawings and do not limit the configuration in any way.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial view partially showing an embodiment of the endless belt for power transmission according to the present invention, FIG. 2 is an enlarged view of part A in FIG. 1, and FIG.
Figure 4 shows the ■-■ line and I in Figure 1, respectively.
It is a sectional view along the V-4V line.

As shown in FIG. 1, the endless belt 1 consists of a large number of first and second blocks 2.2. ...
; 3. 3. It is equipped with... The first block 2 has a recessed fitting portion 2a formed approximately at the center of one side, and a protrusion 2b formed at the center of the other side.

As is clear from FIG. 2, the edge 2C of the protrusion 2b is a slightly bent surface. In that case, the bent surface 2c has a smoothly continuous shape. As is clear from FIG. 3, this first block 2 consists of an outer portion 2d and an inner portion 2e extending in the width direction of the endless belt 1.
and a pair of connecting portions 2f, 2f that connect these. In FIG. 3, the left and right edges 2e7, 2e2; 2dl, 2d2 of the inner and outer portions 2e, 2d are set to be in a straight line, respectively.

In addition, these left and right edges are formed so as to draw a figure 7, that is, the width becomes narrower toward the inside (downward in FIG. 3). These left and right edges serve as friction retaining portions with the pulley.

On the other hand, as is clear from FIGS. 1.2 and 4, the second block 3 is formed approximately in the same shape as the first block 2. That is, the only difference is that the edge 2c of the protrusion 2b of the first block 2 is a bent surface, whereas the edge 3c of the protrusion 3b of the second block 3 is a flat surface. Recessed fitting portion 3a, outer portion 3d, inner portion 3e, pair of connecting portions 3f, 3f, and left and right edges 3 of inner and outer portions 3e, 3d
e, , 3e2; 3d, , 3d2 are formed exactly the same as those of the first block 2.

The first and second blocks 2 and 3 each have a protrusion 2
b and 3b are arranged so as to be in contact with each other.

Therefore, the first block 2 and the second block 3 are
The bending surfaces 2c of the blocks 2 allow them to rotate relative to each other.

As shown in Figures 1.3 and 4, each node 1, 2 block 2
, 3, the outer parts 2e, 2d; 3e, 3c
t and the connecting portions 2f, 2f; 3f, 3f have a large number of link pieces 4.4.・
... are arranged along the length direction of the endless belt 1. In this case, the front ends of the link pieces 4a and the rear ends of the adjacent link pieces 4b are arranged so as to alternately overlap. As shown in FIG. 5, this link piece 4 is formed into a substantially oval ring-shaped flat plate. The outermost link piece 4a1.4a is thinner than the other link pieces 4a and 4b. That is, link piece 41)
Although the number of link pieces on the side is one less than the number of link pieces on the link piece 4a side, the total strength on the link piece 4b side is large enough to resist the force applied to the link piece. Thus, each link piece 4a, 4. b
Since the dimensions are set, the strength on the link piece 4a side increases by one more link piece. Therefore, in order to make the strength of the 1-tal on the link piece 4a side almost the same as the total strength on the link piece 4b side, 2.
The thickness of the link pieces 4al and 4a1 is made thin in this way. These thin link pieces 4a+, 4a+ do not necessarily need to be provided at both outer ends, and may be provided at any position inside. Furthermore, the number of thin link pieces is not limited to two, but one or more may be used.

A hole is formed at the overlap between the front end of the set of link pieces 4a and the rear end of the set of link pieces 4b, and a pair of pins 5.5 are provided to pass through this hole. It is being Both ends of the pair of pins 5, 5 pass through the space formed by the recessed fitting parts 2a, 3a of the first and second blocks 2, 3. The pin 5 has a flat surface on one side and a cylindrical surface on the other side, and a cylindrical surface on the other side, and these two surfaces are smoothly connected by another plurality of cylindrical surfaces.
5 are provided so that the cylindrical surfaces thereof are in contact with each other. On the other hand, the flat side of the pin 5 is the recessed part 2 of the block 2.3.
a, is in contact with the bottom surface of 3a. Therefore, the first and second blocks 2 and 3 are configured to rotate relative to each other within a predetermined range along the cylindrical surface of the pin 5.

As is clear from FIGS. 1 and 3, the first block 2 is provided with a first retainer 6. As shown in FIG. 6(A), this first retainer 6 is formed into an approximately inverted U-shape when viewed from the front, consisting of a second portion 6a and left and right side portions 6b, 6c. As is clear from the upper part 6a
are a pair of first upper portions 6a that protrude upward substantially parallel;
and a second upper portion 6a2. These first and second upper portions 6a, 6a2 are shown in FIG.
As is clear from the figure, it is formed to be slightly curved in one direction (upward in the figure). The first block 6 is formed by injection molding of synthetic resin. Further, instead of resin, it may be formed from another material that is elastic and easily absorbs vibrations.

The first retainer 6 includes first and second upper portions 6a.
The outer portion 2d of the first block 2 is press-fitted into the first block 2 so that the outer portion 2d of the first block 2 is located between + and 6a2. In that case,
As shown in FIG. 6(B), the first and second upper portions 6aI
, 6a2 are curved, so that they reliably abut on the outer portion 2d of the first block 2 at at least three points and elastically clamp the outer portion 2d. Therefore, it is not necessary to make the dimensional accuracy of the first block 2 so high.

Further, as shown in FIG. 3, the left and right side portions 6b and 6c of the first retainer 6 are disposed to cover the left and right ends of the pair of pins 5, 5. Therefore, these left and right sides 6b
, 6c are designed to prevent the pin 5 from being pulled out from each block and link piece. That is, the left and right side portions 6b and 6c serve as a stop for the pin 5 to be removed.

Furthermore, as is clear from FIGS. 1 and 4, the second block 3
A second retainer 7 is provided.

As shown in FIGS. 7(A) and 7(C), the second retainer 7 consists of a single part 7a and left and right side parts 7b, 7c, and has an approximately inverted U shape when viewed from the front, and an inverted U shape when viewed from the side. is formed. As is clear from the same figure (B), the upper part 7a
has recessed fitting portions 7d on the left and right sides.

7d is formed, and the side portions 7b, 7c are slightly curved toward the recessed fitting portions 7d, 7d (downward in the figure). This second retainer 7 is also formed from the same material and by the same manufacturing method as the first retainer.

As shown in the same figure (B), the left and right recessed fitting parts 7d,
The second retainer 7 is press-fitted into the second block 3 so that the blocks 3 fit together. and the side portions 7b, 7c and the left and right protruding portions 7e of the upper portion 7a.

7f elastically clamp the second block 3, respectively. In that case, since the side portions 7b and 7c are slightly curved toward the recessed fitting portion 7d, the side portion 7b.

7C and the protrusions 7e and 7f come into contact with the second block 3 reliably. Therefore, the dimensional accuracy of the second block 2 does not need to be so high.

The next link piece 4. is attached to the front end of the link pieces 4b, 4b, . The rear end portions of a, 4a, . And these pins 5, 5 are also the recessed fitting parts 2a of the next first and second blocks 2, 3,
It passes through the space formed by 3a. In this way, there are two sets of link pieces 4a.

4a, ...; 4b, 4b, ... are a pair of pins 5
, 5, and the pins 5, 5 are supported by the first and second blocks 2.3, so that these first and second blocks 2, 3, link pieces 4a, 4
b. The pins 5, 5, and the first and second retainers 6.7 are assembled to form a belt shape.

As shown in FIGS. 1 and 8, pins 5. 5; 5. Attach link pieces 4c, 4c, ... to 5, and
A pair of pin retainers 8.8 are installed at both left and right ends of these pins.
guess.

As is clear from FIG. 8, the pin retainer 8 has a pair of pin abutting portions 8a, 8 in which the end surfaces of the pins 5 abut in the longitudinal direction.
a is formed, and these pair of pin contact portions 8
An insertion portion 8b is formed between a and 8a to be inserted into the hole 4c of the link piece 4C. Therefore, a step is formed between the pin contact portion 8a and the insertion portion 8b.

The left and right pin retainers 8, 8 are held by a substantially U-shaped clip 9 in the insertion portion 8b. In that case, the clip 9 is inserted into the endless belt 1 from inside. Also, as is clear from Figure 9,
The upper end of the pin contact portion 8a of the pin retainer 8 mounted in this manner comes into contact with the lower end of the first block 2.

Furthermore, a third retainer 6- is attached to the first block 2 located at the last endless portion.

As is clear from FIG. 10(A), this third retainer 6' is formed into an inverted U-shape when viewed from the front from an upper portion 6=a and left and right side portions 6=b and 6-c. Also, Figure 10 (
C), the upper part 6' is the first upper part 6'
It is formed into a substantially U-shape having aI and a second upper portion 6'a2. Therefore, a recessed fitting portion 6=d is formed between these first and second upper portions. Also, the same figure (
As is clear from B), the first upper portion 6a1 is formed relatively long so that its width is approximately the same as the width of the upper portions 2d and 3d of the blocks 2 and 3, and the recessed fitting portion 6
It is slightly curved toward =d. On the other hand, the second
The width of the upper portion 6=a2 is relatively short.

The third retainer 6- formed in this way has a recessed fitting portion 6.
The upper part 2d of the first block 2 is press-fitted into the third retainer 6-d. In this case, since the first upper portion 6'a1 is curved, the third retainer 6' can be reliably attached to the first block 2 in abutment. Also, between the second blocks 2 and 3, the first and second '' double portions 6'a1.6 of the third retainer 6-
'4a2 comes to intervene.

In this way, the endless belt 1 is formed.

In the endless bell l-1 formed in this way, the first
From the central part between the block 2 and the second block 3 to the outer part, the first retainer 6.6' of the first and third retainers 6.6'
and second upper portion 6al, 6a2.6-al, 6-a2
There will always be some intervention.

Moreover, no retainer is interposed between the blocks 2 and 3 inside the endless belt l-1 so that the endless belt 1 can be bent at a predetermined radius. However, at the minimum rotation radius of the endless belt 1, a slight gap is maintained so that the adjacent blocks 2 and 3 do not come into contact with each other.

An endless belt 1 is stretched between an input pulley and an output pulley in a belt-type continuously variable transmission.

As the input pulley rotates, the endless belt 1
rotates, and the rotation is transmitted to the output pulley, causing the output pulley to rotate.

At this time, centrifugal force is applied to the pin retainer 8, but the pin retainer 8 is positioned in the radial direction by the insertion part 8b, and the position in the circumferential direction is determined by the step between the pin contact part 8a and the insertion part 8b. Since the pin retainer 8 is positioned, the pin retainer 8 will not fall off even if such centrifugal force is applied. Particularly in the case of this embodiment, since the upper end of the pin contact portion 8a of the pin retainer 8 is in contact with the lower end of the upper part 2d of the first block 2, the positioning in the radial direction becomes more reliable.

Moreover, since the clip 9 is inserted from the inside of the endless belt 1, the direction of the centrifugal force applied to the clip 9 is opposite to the direction in which the clip 9 falls off.
There is almost no possibility that the clip 9 will fall off due to centrifugal force.

On the other hand, the first and second blocks 2 and 3 are relative to each other around the abutting portion of the pin 5 or the protrusions 2b and 3b from when they are about to frictionally engage with each pulley until when this engagement is released. Rotate. When the endless belt 1 frictionally engages or disengages from each pulley, the first or second blocks 2, 3 try to come into contact with the adjacent block 3.2, but these blocks 2 ,3
In between, the first upper member 6a+, 6-al or the second upper member 6a2゜6'a2 of the first and third retainers 6.6'
is present, so the first block 2 and the second block 3 do not come into direct contact.

Therefore, it is almost impossible for the blocks 2 and 3 to collide with each other, causing vibrations or noise. Moreover, since these first and second two-part members 6a7, 6a2 are curved, when pressed by the block 2.3, the first and second upper members 6a, 6
a2 becomes elastically deformed, and the impact is absorbed and alleviated. The same applies to the third retainer 6'.

Further, since the 1.3rd retainer 6.6' is in contact with the second block 2, and the second retainer 7 is in contact with the third block 3, the vibrations generated in the blocks 2 and 3 themselves are suppressed by these retainers 6.7. be able to absorb it effectively.

That is, the third retainer 6' constitutes a vibration absorbing member of the present invention.

Note that the present invention is not limited to the above-described embodiments, and various design changes are possible.

For example, in the above embodiment, the pin retainer 8, the clip 9, and the third retainer 6- are used at the last endlessly connected portion, but they can be used in place of the first retainer 6 at other locations as well. .

As is clear from the above description, according to the endless belt of the present invention, the pin retainer has a pin contact portion where the pin contacts and an insertion portion that is inserted into the hole of the link piece. Radial and circumferential positioning is ensured. Therefore, even if centrifugal force is applied to the pin retainer, it is unlikely to fall off. In particular, since the clip is inserted from the inside of the endless belt, it is even less likely to fall off.

In addition, since the pins are not caulked, the strength of the pins is prevented from decreasing, and the durability of the dowel pins is improved.

[Brief explanation of the drawing]

Fig. 1 is a partial view partially showing the endless belt for power transmission according to the present invention, Fig. 2 is an enlarged view of section A in Fig. 1, Fig. 3 is a sectional view taken along the line ■-■ in Fig. Figure 4 is a sectional view taken along line IV-IV in Figure 1, Figure 5 is a front view of the link piece, Figure 6 is the first retainer, (A) is its front view, and (B) is its plan view. , (C) is a side view, 7th
The figure shows the second retainer, (A) is its front view, (
B) is a plan view, and (C) is ■C-■C in the same figure (A).
8 is a sectional view taken along the line ■-■ in FIG. 1, FIG. 9 is a sectional view taken along the line IX-IX in FIG. 1, and FIG. 10 shows the third retainer. (A) is a front view thereof, (B) is a plan view thereof, and (C) is a sectional view taken along the xc-xc line in the same figure (A). 1...Endless transmission belt, 2...1st block 3
°°.

Claims (1)

[Claims] (1) For transmission of torque between an input pulley disposed on the output shaft side of a starting device and an output pulley disposed on the output shaft side of a continuously variable transmission. In the endless belt, the endless belt is connected to one or more link rows, and includes a large number of plate-shaped blocks each having an inclined contact surface that frictionally engages with the input and output pulleys, and a large number of plate-like blocks that make up the link row. A pair of pin retainers are provided so as to be in contact with both the left and right ends of the pin, respectively, and the pair of pin retainers are connected to a nearly universal belt that is attached from the inside of the endless belt. 1. An endless belt for power transmission, characterized in that the endless belt is held by a letter-shaped clip, and both ends of the clip are locked to the outer part of the link piece. (2) The pin retainer includes a pair of pin abutting portions that abut against the end surfaces of the pins, and an insertion portion that is inserted into the hole of the link between the pair of pin abutting portions, and further includes the left and right pin retainers. The endless belt for power transmission according to claim 1, wherein the insertion portion is held between the clips. (3) The endless transmission belt according to claim 2, further comprising a vibration absorbing member attached to the block supported by the retainer and frictionally engaged with the input/output pulley to suppress vibration of the block.