WO2005068874A1

WO2005068874A1 - Transmission endless belt

Info

Publication number: WO2005068874A1
Application number: PCT/JP2005/000818
Authority: WO
Inventors: Masahiro Hasebe; Hisanori Shirai; Kenichi Shimakawa
Original assignee: Kabushiki Kaisha Equos Research
Priority date: 2004-01-19
Filing date: 2005-01-18
Publication date: 2005-07-28
Also published as: JP2010139075A; JPWO2005068874A1

Abstract

Coming off of connection pins and displacement in arrangement of ring plates are prevented with the minimum number of retainers without interrupting operation of the connection pins relatively rotating. To achieve this, an endless belt has a large number of ring plates (1), pairs of segment pins (2, 3), and retainers (4). The segment pins (2, 3) are fitted in the ring plates adjacent to each other in the width direction of the belt and connect the ring plates to each other to form the endless belt, the segment pins being arranged so as to be relatively rotatable with their peripheral surfaces in contact to each other. The retainers (4) are fixed at end sections of the segment pins, preventing the segment pins from coming off. A segment pin is constructed from a long pin (2) whose both end surfaces (21) are surfaces in contact with pulley wall surfaces and from a short pin (3) whose both end surfaces (31) are separated from the pulley wall surfaces. A retainer has a fixing section (41) at which the retainer is fixed to the peripheral surface of an end section of the long pin and has a contact section (42) at which the retainer is in contact with an end surface of the short pin.

Description

Specification Endless belt for transmission

The present invention relates to an endless belt for transmission of a belt-type continuously variable transmission, and more particularly, to use a plurality of link plates with pins to wind around two pulleys arranged in parallel shaft to transmit torque between the two pulleys. The present invention relates to an endless transmission belt of a type connected in an endless chain. Background art

One type of continuously variable transmission (CVT) is a belt-type continuously variable transmission that transmits torque by winding an endless belt between two pulleys arranged in parallel shafts. In a continuously variable transmission that uses an endless belt, the endless belt is wound around the wall of the pulley from the center of the rotating shaft by changing the distance between the pair of burries (primary bullies and secondary bullies) on the parallel rotating shaft. The speed change (change in the rotation ratio between the primary pulley and the secondary pulley) is realized by changing the distance to the next position (that is, the radius of rotation when the endless belt winds around the pulley, hereafter referred to as the pitch circle radius). For example, if the pitch circle radius on the primary side is small and the pitch circle radius on the secondary side is large, the gear ratio will be on the reduction side, and conversely, if the pitch circle radius on the primary side is large and the pitch circle radius on the secondary side is small, the gear ratio will be changed. The ratio is on the speed increasing side. As a result, torque is transmitted from the primary pulley to the endless belt on the driving side and from the endless belt to the secondary pulley on the driven side at a position where the endless belt winds around the pulley wall.

There are various types of endless transmission belts for this type of belt-type continuously variable transmission. One of them is a large number of link plates formed into endless chains by connecting pins. Some are linked. In this type, some type of retaining means is required to keep the connecting pin from coming out of the link plate. A method of press-fitting the connecting pin into the plate to prevent it from coming off is also conceivable, but press-fitting causes residual stress in the link plate and reduces the durability of the link plate. The connecting pins are paired with each other so that the link plate can rotate without friction. Normally, the link plate does not rotate with respect to the link plate, but instead bends the link plate by rolling between the link pins.However, when two link pins form a pair, the No stops can be fitted around the edges. This is because the stoppers hinder each other's rolling. Therefore, conventional techniques as disclosed in Patent Literature 1 and Patent Literature 2 have been conventionally proposed.

(Patent Document 1) Japanese Patent Application Laid-Open No. 62-49042

(Patent Document 2) Japanese Patent Application Laid-Open No. H11-124

However, the prior art has the following problems.

In the technique described in Patent Document 1, the pin is prevented from coming off by spot welding to the connecting pin.However, spot welding easily breaks the welded part, which may cause the retaining pin fixing the retainer to come off. is there. In addition, the number of parts increases because a stop pin for fixing the retainer is required for each connection pin.

On the other hand, in the technique described in Patent Document 2, the clip is used to prevent the connecting pin and the link from coming off. However, since the connecting pins that move relative to each other are clipped, the clip is likely to come off.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a mechanism for preventing the connecting pins from falling out and arranging the link plates without interfering with the operation of the divided connecting pins, which roll with each other, using as few retainers as possible. The purpose is to prevent displacement. Disclosure of the invention

The present invention relates to a transmission endless belt that is wound around two pulleys to transmit torque between the pulleys. The transmission endless belt includes a plurality of link plates (1), which are rotatable relative to each other with their peripheral surfaces in contact with each other. A pair of split pins (2, 3) that are fitted into link plates that are adjacent to each other in the direction and link the link plates to each other to make them endless. The split pins are fixed to the ends of the split pins to prevent the split pins from coming off. In the transmission endless belt provided with a retainer (4), the split pin includes a long pin (2) having both end surfaces (2 1) as a contact surfaces with a pulley wall surface (S); 31) is composed of a short pin (3) separated from the pulley wall surface, and the retainer includes a fixing part (41) fixed to an end peripheral surface of the long pin and an end face of the short pin. The main feature is that it has an abutting part (4 2). The said structure WHEREIN: The said retainer is comprised by an annular member, The inner diameter part is being fixed to the end part of a long pin by press-fitting in the peripheral surface of the said long pin as a fixed part, The said contact part is the said It is effective to cover the end surface of the short pin. Further, the retainer is formed of a snap ring capable of elastic deformation in a radially expanding direction, and the long pin has a groove (22) for fitting the snap ring at an end thereof, and is fitted into the groove. Thereby, the retainer may be fixed to the end of the long pin, and the contact portion may cover the end surface of the short pin. Alternatively, the retainer includes a pair of side plate portions (40) having, as fixing portions, fitting holes that fit into end peripheral surfaces of the long pins, and side plates at both ends of the long pins across a belt in the width direction. And a flexible connecting portion (43) for connecting the connecting portions to each other. The connecting portion is bent and the fitting holes of the side plate portions are fitted into both ends of the long pin, thereby being fixed to the long pin. Thus, a configuration in which the contact portion covers the end surface of the short pin can be adopted. In this case, it is effective that the connecting portion of the retainer straddles the belt in the width direction at a position in contact with the peripheral surface of the link plate and connects the side plate portions at both ends of the long pin to each other. is there. It is also effective that the contact portion of the retainer has a contact surface that covers the entire end surface of the short pin. Further, the thickness of the retainer along the longitudinal direction of the long pin is at least partially equal to the distance between the wall surface of the pulley and the outermost surface in the belt width direction of the link plate. Is also effective. Brief Description of Drawings

FIG. 1 is a partial side view of an endless transmission belt according to Embodiment 1 of the present invention.

FIG. 2 is a partial plan view of the belt.

FIG. 3 is a cross-sectional view of the belt at a portion where the belt is wound.

FIG. 4 is a cross-sectional view of a part where a belt is wrapped around a pulley showing a partially modified example of the first embodiment.

FIG. 5 is a partial side view of the transmission endless belt according to the second embodiment.

FIG. 6 is a cross-sectional view of a pulley winding portion of the belt.

FIG. 7 is a partial side view of an endless belt for transmission according to the third embodiment.

FIG. 8 is a cross-sectional view of a pulley winding portion of the belt.

FIG. 9 is a partial side view of the transmission endless belt according to the fourth embodiment. FIG. 10 is a cross-sectional view of a pulley winding portion of the belt. BEST MODE FOR CARRYING OUT THE INVENTION

It is desirable that the fixing portion of the retainer in the present invention is fixed to the end of the long pin by press-fitting the pin into the peripheral surface. As a result, the desired effect of the present invention can be achieved with an annular retainer having a simple configuration and a minimum number of processing steps.

(1) Example 1

1 to 3 show an endless belt for transmission according to the first embodiment. As shown in the partial side view of FIG. 1, the endless belt is composed of a number of flat plate-like link plates 1, split pins 2 and 3 for connecting the link plates 1 to each other, and a retainer 4. In FIG. 1, some components that are originally arranged in all positions are partially omitted in order to clarify the individual shapes of components that do not appear in the drawing by overlapping each other. By the way, one division at the part of the link plate la (the letter of the alphabet and the dash in the code indicating the link plate is added only for distinguishing the arrangement position, and does not indicate the difference in the configuration of the members) The illustration of the pin 3 and the retainer 4 is omitted, the illustration of the two retainers 4 at the link plate 1b is omitted, and the illustration of one of the split pins 2 and the retainer 4 at the link plate 1e is omitted. I have.

Each link plate 1 is made of the same shape as a common part, and four corners are rounded by punching a thin steel plate, etc., as can be seen from the arrangement position 1b in Fig. 1. It is composed of a substantially rectangular plate. Each link plate 1 is rotatably connected to adjacent link plates in the belt longitudinal direction by split pins 2 and 3. The rotation of the adjacent link plates by the dividing pins 2 and 3 causes the belt to be wound around the pulley with a predetermined radius of rotation as indicated by the symbol P in FIG. The dashed line indicated by the symbol P is a line that connects the portion of each bin 2 that contacts the wall surface of the pulley that contacts the wall surface of the pulley, and a line that extends that line to a portion where the endless belt is straight. This is called a pitch line.

Furthermore, each link plate 1 is provided with a pair of pin through holes 11 penetrating in the plate thickness direction near both ends in the longitudinal direction. These holes may be two independent holes for each of the split pins 2 and 3 inserted into the link plate 1, but in this embodiment, both pin through holes 11 are These holes are connected to each other by another hole 12 that straddles both holes, and the weight of each link plate 1 is reduced. As a result, each link plate 1 has a substantially oval ring shape in a side view. Present. In detail, the two pin through holes 11 are slightly smaller in diameter than the outer diameter when the split pins 2 and 3 are combined, except for the peripheral surface cut out by the lightening holes 1 2. By passing through the split pins 2 and 3 having the corresponding large-diameter and small-diameter locking peripheral surface shapes, the split pins 2 and 3 are stopped and locked at the step of the diameter difference. It is shaped. Each of the link plates 1 having such a structure is alternately arranged in the thickness direction by aligning the positions of the one pin hole 11 and the other pin hole 11 (in the vertical direction in FIG. 2) to form a link plate group that is shifted in the longitudinal direction of the link plate by the pitch of the pins, and these link plate groups are divided into the pins 1 through holes 11 by the divided pins 2, 3. Through the endless connection.

Each of the split pins 2 and 3 for connecting the link plate group is configured such that the long pin 2 and the short pin 3 form a pair. Such splitting of the pins is intended to eliminate relative sliding between the split pins 2 and 3 and the link plate 1, and the long pin 2 or the long pin 2 locked to one of the adjacent link plates 1. The short pin 3 and the short pin 3 or the long pin 2 locked on the other link plate 1 ′ roll relative to each other with the relative rotation of both link plates 1, 1 ′, and relative sliding occurs. Is avoided. The term “split pin” means that one linking member (connecting pin) that connects adjacent link plates in the belt longitudinal direction so as to be rotatable with each other is divided into a pair of two pins. It is named because of its structure.

In order to realize such rolling rotation, as shown in Fig. 1, the long pin 2 has a cylindrical rolling surface on the split surface side opposite to the locking peripheral surface with the link plate 1 described above. Similarly, the short pin 3 also has a similar rolling surface. As a result, when the endless belt is wound around the pulley, when the adjacent link plates rotate around the dividing pins 2 and 3, these rolling surfaces roll while abutting on each other, so that the pins 2 and 3 are rotated. The adjacent link plates 1 and 1 'can rotate relative to each other without sliding between the link plate 1 and the split pins 2 and 3. With this configuration, energy loss due to sliding can be prevented.

In the present embodiment, the retainer 4 has an inner hole shape substantially matching the cross-sectional shape of the long pin 2. Is an elliptical ring-shaped plate member having a flat hole as a fixing portion 4 1 to the long pin 2, and the width of the ring portion (distance between the inner hole and the outer peripheral surface) is approximately the minor axis of the short pin 3. The width is the same as the thickness in the direction.

As shown in a plan view in FIG. 2, each link plate 1 is overlapped in the plate thickness direction by a distance corresponding to the pin arrangement pitch, and is adjacent to the link plate 1 'in the plate thickness direction. The endless connection is made by inserting a pair of split pins 2 and 3 which are individually flat and combined to form a substantially circular shape, into the generally circular hole formed by the overlapping of the two. Retainers 4 are fixed to both ends of each long pin 2 by press fitting. The retainer 4 is fixed to both ends of the long pin 2 in the direction of the pin axis by being pressed into the peripheral surface of the long pin 2 in this manner. Therefore, the long pin does not fall off the link plate. The annular portion of the retainer 4 has such a size that a part thereof covers the end surface of the short pin 3. That is, of the annular portion of the retainer 4, the portion covering the end face of the short pin 3 serves as the contact portion 42 and regulates the movement of the short pin 3 in the axial direction with respect to the long pin 2. That is, although the retainer 4 is not fixed to the short bin 3, the short bin 3 is prevented from falling off from the link plate by the contact portion 42 of the retainer 4. The press-fit position of the retainer 4 to the long pin 2 is set according to the length of the short pin 3, but a predetermined play space is left between both end surfaces of the short pin 3 and the inner surface of the retainer 4. It is desirable to set it to prevent wear. In this embodiment, the contact portion 42 is configured to cover the entire end face of the short pin 3. However, even if the contact portion 42 is configured to cover a part of the end face of the short bin, the effect of preventing the short pin from coming off the link plate can be obtained.

As shown in the cross section in Fig. 3, the endless belt for transmission having such a configuration has both ends of the long pin 2 in contact with the pulley wall S at the position where the belt is wound around the pulley, and a retainer is provided on the inside away from the contact surface. 4 will be located. In FIG. 3, the left retainer is shown in cross section, and the right retainer is shown in side view. Therefore, in the transmission state, only the long pin 2 of the endless belt comes into contact with the burry wall S to transmit the driving force, and the power transmitted from the bury wall S to the long pin 2 is linked via the short pin 3 to the link. The power is transmitted to the plate 1 and the power is repeatedly transmitted to the next split pins 2 and 3 and the link plate 1 connected by the split pins. Become. According to the configuration of the first embodiment, the retainer 4 fixed to the end of the long pin 2 while allowing the relative rotation of the divided pins 2 and 3 with the number of retainers corresponding to the number of the long pins 2. Accordingly, the split pins 2 and 3 can be prevented from coming off and the alignment of the link plate 1 can be prevented from being misaligned. In this embodiment, the fixing portion 41 of the retainer 4 is fixed to the end of the long pin 2 by press-fitting the peripheral surface of the long pin 2. The above effect can be achieved with 4 and the minimum number of processing steps.

In the first embodiment, the retainer 4 is not in contact with the pulley wall S. However, in order to more reliably prevent the retainer 4 fixed to the long pin 2 by press-fitting, the retainer 4 is also a bulge. It is also possible to adopt a configuration in which at least a part thereof is in contact with the wall S. FIG. 4 shown below shows a modified example adopting such a configuration in a sectional view. In this case, the retainer 4 is made thicker than that of the previous embodiment, and the thickness of the long pin 2 of the retainer 4 along the longitudinal direction is at least partly set to the pulley wall S and the link plate. It is almost the same as the distance between the outermost surface in the belt width direction of No. 1.

In the case of this modification, it is inevitable that the retainer 4 comes into contact with the wall surface S of the pulley to increase the abrasion with respect to the previous embodiment, but the retainer 4 is displaced from the long pin 2 in a direction in which the retainer 4 comes off. However, since the push-back force acts upon the contact with the pulley wall S, the advantage that the retainer 4 is always returned to the normal position is obtained.

(2) Example 2

5 and 6 show an endless belt according to a second embodiment of the present invention. This embodiment is different from the first embodiment in that the method of fixing the retainer 4 to the long pin 2 is changed. In this example, retainer 4 comprises a snap ring. Hereinafter, only the changes to the above embodiment will be described. In the present embodiment, grooves 22 are formed at both ends of the long pin 2, and the retainer 4 fitted and fixed in the groove 22 is formed of a snap ring that can be elastically deformed in the radially increasing direction. The snap ring that constitutes the retainer 4 is in the form of a so-called E-ring, which is provided with a claw portion extending an arc portion from both ends of a semicircular plate member 42 as a fixing portion 41. Is fitted in the groove 22, and the semicircular plate surface 42 is shaped to function as a contact portion that covers the end surface of the short pin 3. Also in this example, the semicircular plate surface 42 as the contact portion of the retainer 4 is configured to substantially completely cover the end surface of the short pin 3. In addition, the plate surface 4 2 (contact part) should almost completely cover the end face of the short pin. Thus, the short pin can be completely and stably prevented from falling off the link plate. However, the plate surface 42 does not necessarily have to be semicircular, and if the plate material 42 does not completely cover the end surface of the short pin 3, if it is configured to cover a part of the end surface of the short pin 3, The effect of preventing the end pin 3 from coming off can be obtained.

According to this embodiment, the same effect as that of the first embodiment can be obtained. In the case of this example, the processing man-hour required for the processing of the groove 22 on the long pin 2 is different from that of the first embodiment, but the fixing of the retainer 4 to the long pin 2 becomes the groove fitting. Therefore, there is an advantage that the displacement of the retainer 4 is more reliably prevented.

(3) Example 3

7 and 8 show an endless belt according to a third embodiment of the present invention. In this embodiment, the method of fixing the retainer to the long pin is further changed from the first and second embodiments. In this example, a configuration is adopted in which the retainer 4 is prevented from coming off from the long pin 2 by interconnection. Hereinafter, only the changes from the previous embodiment will be described. In the present embodiment, as shown in the cross-sectional shape in FIG. 8, a retainer fitting portion 23 in which the pin cross section is partially reduced is formed at both ends of the long pin 2, and the reduced cross section and other cross sections are formed. The step between them constitutes a position restricting portion. In this example, the retainer 4 includes a pair of side plate portions 40 having a fitting hole 41 fitted on the peripheral surface of the end of the long pin 2 and the side plate portions 40 across the belt in the width direction. A flexible connecting portion 43 for connecting the connecting portion 43 and bending the connecting portion 43 so as to fit the fitting pin 41 of the side plate portion 40 as a fixing portion into both ends of the long pin 2 to be long. The contact portion 42 fixed to the pin 2 and formed as a part of the side plate portion 40 covers the end surface 31 of the short pin 3.

Specifically, the retainer 4 has a configuration in which a thin plate material having a predetermined width is bent in a U-shape, and a rectangular hole 4 is formed in one corner of the rectangular side plate portion 40 in a side view as shown in FIG. 1 is formed. The rectangular hole 41 does not necessarily have to match the cross-sectional shape of the retainer fitting portion of the long pin 2, for example, it contacts the peripheral surface of the long pin 2 at two points, thereby What is necessary is just to be fixed without rattling. And, since the looseness of the retainer 4 with respect to the long pin 2 is prevented by this fixing, the connecting portion 43 holds the belt in the width direction at a position where a predetermined gap is maintained with respect to the outer peripheral surface of the link plate 1. It is straddling. This prevents wear due to unnecessary contact between the retainer 4 and the link plate 1. It is.

With the configuration of the third embodiment, the same effects as those of the previous embodiments can be obtained. And especially in this case. Since the retainers on both sides are integrated, there is an advantage that the number of parts can be reduced.

(4) Example 4

Finally, FIGS. 9 and 10 show an endless belt according to Embodiment 4 of the present invention. This embodiment is essentially the same as the third embodiment, except that the method of fixing the retainer to the pins is different from the third embodiment. In the case of this example, the fixing of the retainer 4 to the long pin 2 is looser than that of the third embodiment. In other words, the rectangular hole 41 of the retainer 4 is fitted to the peripheral surface of the long pin 2 to such an extent that there may be backlash. Then, since it is assumed that the retainer 4 rattles against the long pin 2 due to this fixing, the connecting portion 43 is positioned on the outer peripheral surface of the link plate 1 as seen in a sectional view in FIG. The belt is straddling in the width direction at the contact position. This straddling position is assumed to pass through the central part of the link plate 1 in the row direction and the adjacent part of the link plate 1 ′, so as not to hinder the relative rotation of the link plate 1 around the dividing pins 2 and 3. Have been. Therefore, in a side view with reference to FIG. 9, the connecting portion 43 is located at a position shifted by substantially a half pitch with respect to the fitting portion with the split pins 2 and 3.

According to the configuration of the fourth embodiment, the same effect as that of the third embodiment can be obtained. And especially in this case. The hole 4 1 constituting the fixing portion 4 1 of the retainer 4 to the long pin 2 can be fitted to the long pin 2 with a large tolerance. can get.

Note that the present invention can also be expressed as follows. That is, an endless chain belt for a pulley type CVT, a number of link plates, a connecting member connecting the link plates to form an endless chain belt, and the connecting member falling off the link plate. The connecting member is composed of a long bottle and a short bottle, and both end surfaces of the long bottle are formed when the long pin is wound around the pulley. The short pin is in contact with the wall surface of the pulley, the length of the short pin is shorter than the length of the long pin, the retainer is fixed to an end of the long bin around the end, and the retainer is connected to an end of the short pin. It is characterized by having a facing portion that faces. Here, the connection member It is equivalent to the split pin (2, 3), and the stopper part is equivalent to the contact part (42). Further, the present invention is applicable even if the shape and arrangement of the link plate described in the above embodiment and the sectional shape of the divided pin are changed. Industrial applicability

According to the transmission endless belt of the present invention, of the pair of divided pins consisting of the long pin and the short pin, a part (contact portion) of the retainer fixed to the long pin faces the end face of the short pin. Therefore, the short pin is prevented from coming off the link plate by the retainer. Therefore, it is possible to prevent the divided pins (long and short pins) from coming off and prevent the link plate from being displaced by allowing the relative rotation of the divided pins by the minimum number of retainers.

Claims

The scope of the claims

1. A transmission endless belt that is wound around two pulleys to transmit torque between the pulleys, and has a number of link plates and links adjacent to each other in the width direction of each belt so that their peripheral surfaces are in contact with each other and are relatively rotatable. A transmission endless belt comprising: a pair of split pins that are fitted into a plate and connect the link plates to each other to form an endless link; and a retainer that is fixed to an end of the split pin and prevents the split pin from coming off.

The split pin is composed of a long pin having both end faces abutting against the pulley wall, and a short pin having both end faces separated from the bully wall, and the retainer is provided on an end peripheral surface of the long pin. An endless transmission belt having a contact portion between a fixed portion and an end surface of the short pin.

2. The retainer is formed of an annular member, and is fixed to an end of the elongate pin by press-fitting the inner surface of the elongate pin into a peripheral surface of the elongate pin with the inner diameter part as a fixing part. The endless belt for transmission according to claim 1, which covers an end surface of the short pin.

3. The retainer is formed of a snap ring that can be elastically deformed in a radially expanding direction, and the long pin has a groove at an end thereof for fitting the snap ring. 2. The endless transmission belt according to claim 1, wherein the retainer is fixed to an end of the long pin, and the contact portion covers an end surface of the short pin.

4. The retainer has a pair of side plate portions having, as fixing portions, fitting holes to be fitted into end peripheral surfaces of the long pins, and side plate portions at both ends of the long pins across a belt in the width direction. And a flexible connecting portion for connecting the two to each other. The connecting portion is bent and the fitting holes of the side plate portions are fitted into both ends of the long pin, thereby being fixed to the long pin. 2. The endless belt for conduction according to claim 1, wherein a contact portion covers an end surface of the short pin.

5.The transmission device according to claim 4, wherein the connecting portion of the retainer connects the side plate portions at both ends of the long pin to each other by straddling a belt in a width direction at a position in contact with a peripheral surface of the link plate. Edge belt

6. The endless belt for transmission according to claim 1, wherein the contact portion of the retainer has a contact surface that covers the entire end surface of the short pin.

7. The thickness of the retainer along the longitudinal direction of the long pin is at least partly substantially the same as the interval between the pulley wall surface and the outermost surface in the belt width direction of the link plate. The endless transmission belt according to claim 1.