JP2011144841A - Transmission belt for vehicular belt type continuously variable transmission - Google Patents

Abstract

A transmission belt for a belt type continuously variable transmission for a vehicle with improved durability is provided.
A pair of endless annular buffer members 32 interposed between one and the other of a pair of engaging protrusions 18c and a first ring 14 and a second ring 16 located on the inner peripheral side thereof are provided. Therefore, even if the first ring 14 and the second ring 16 are pulled outward with respect to the element 18 when the transmission belt 10 is pulled away from the pulley during its longitudinal rotation, the first ring 14 and the first ring 14 Since the buffer member 32 is interposed between the outer peripheral surface 24 of the two ring 16 and the engaging protrusion 18c of the element 18, it is possible to suppress the outer peripheral surface 24 from being damaged. Therefore, it can suppress that durability of the 1st ring 14 and the 2nd ring 16 resulting from the damage | wound can be suppressed, and durability of the transmission belt 10 is improved.
[Selection] Figure 2

Description

  The present invention relates to a transmission belt for a belt type continuously variable transmission for a vehicle, and more particularly to a technique for increasing the durability of the transmission belt.

  A plurality of endless annular belt-like members are stacked, and each includes a pair of rings arranged in parallel to each other, and a plate-like member connected in a ring shape in the thickness direction along the longitudinal direction of the pair of rings. A pair of guide protrusions that project from the both ends in the width direction of the pair of bases to the outer peripheral side of the pair of rings and face each other across the pair of rings. And a plurality of engaging protrusions that protrude from the distal ends of the pair of guide protrusions and that prevent the relative movement of the pair of rings toward the outer peripheral side. There is known a transmission belt for a vehicular belt type continuously variable transmission including the above element. For example, it is described in Patent Document 1. This Patent Document 1 discloses a technique for reducing the wear of an element due to contact between elements by coating a fluororesin on the surface where the elements arranged in the longitudinal direction of the ring contact each other. Has been.

  The transmission belt is wound around a V-groove of a drive side pulley and a driven pulley of variable groove width provided on an input shaft and an output shaft of a belt type continuously variable transmission for a vehicle, and the drive side pulley and the driven side pulley Used to transmit power to and from. The belt-type continuously variable transmission for a vehicle has a relative rotation between the input shaft and the output shaft by changing the winding width of the transmission belt by changing the groove width of the driving pulley and the driven pulley. Shifting is performed by continuously changing the speed ratio.

JP 2000-249195 A

  By the way, the conventional transmission belt is rotated in the longitudinal direction by rotating the driving pulley while being wound around the pulleys and being pressed in the width direction. At that time, among the plurality of elements, the element located at the circumferential position where the transmission belt is separated from the pulley is held by being pressed by the pulley, so that it tries to rotate with the pulley as it is around the axis of the pulley. . However, the element is separated from the V-groove of the pulley by a pair of rings that support the element, and rotates in the longitudinal direction together with the ring. Here, when the element is pulled away from the V groove of the pulley, the outer peripheral surfaces of the pair of rings are brought into contact with the base side corners of the engagement protrusions of the element. As a result, the outer peripheral surface of the ring may be damaged, and the durability of the ring may be reduced.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a transmission belt for a belt type continuously variable transmission for a vehicle with improved durability.

  To achieve this object, the gist of the invention according to claim 1 is that: (a-1) a plurality of endless annular strip members are laminated, and a pair of rings arranged in parallel with each other; (A-2) a base portion located on the inner peripheral side of the pair of rings formed of a plurality of plate-like members connected in a ring shape in the thickness direction along the longitudinal direction of the pair of rings, and the width direction of the base portion A pair of guide projections projecting from the both ends of the pair of rings and facing each other across the pair of rings, and on the side approaching each other from the tip ends of the pair of guide projections A transmission belt for a belt-type continuously variable transmission for a vehicle, comprising a plurality of elements each projecting and having a pair of engaging projections for preventing relative movement of the pair of rings toward the outer peripheral side. (B) one of the pair of engaging protrusions And providing a pair of endless annular cushioning members interposed between the other and one and the other of the pair of rings located on the inner peripheral side thereof.

  The gist of the invention according to claim 2 is that, in the invention according to claim 1, (a) the endless annular buffer member is a flat portion adjacent to the base side surface of the engagement protrusion. And an L-shaped flexible resin member integrally having a rising portion that rises from one side edge of the flat portion and is adjacent to the opposing surfaces of the pair of engaging protrusions, b) The flat portion is to be inserted between the base-side surface of the engaging protrusion and the ring.

  Further, the gist of the invention according to claim 3 is that, in the invention according to claim 2, (a) the surface on the base side of the engagement protrusion is closer to the side away from the guide protrusion. (B) the flat portion of the buffer member has a thickness dimension that decreases toward the side away from the guide protrusion, and one end on the guide protrusion side. The thickness dimension of the portion is formed so as to be larger than the distance between the corner on the base portion side of the engaging protrusion and the ring on the inner peripheral side thereof.

  According to the transmission belt for a vehicular belt type continuously variable transmission according to claim 1, one and the other of the pair of engaging projections and one and the other of the pair of rings positioned on the inner peripheral side thereof The ring is pulled to the outer peripheral side with respect to the element when the transmission belt is pulled away from the V groove of the pulley during its longitudinal rotation. In addition, since the buffer member is interposed between the outer peripheral surface of the ring and the engagement protrusion of the element, it is possible to suppress the outer peripheral surface of the ring from being damaged. Therefore, it can suppress that the durability of a ring falls by the damage | wound, and durability of a transmission belt is improved.

  According to the transmission belt for the belt type continuously variable transmission for a vehicle according to the second aspect of the present invention, the buffer member includes a flat portion adjacent to the base side surface of the engaging protrusion, and one of the flat portions. A flexible resin member having an L-shaped cross section integrally having a rising portion that rises from a side edge and is adjacent to the opposing surfaces of the pair of engaging protrusions, the flat portion being an engaging protrusion Since the ring is inserted between the base side surface and the ring, even after the ring and the element are assembled to each other, it is possible to engage the ring and the element by utilizing the flexibility of the buffer member. It is possible to fit and assemble between the protrusions.

  According to the transmission belt for a vehicle belt type continuously variable transmission of the invention according to claim 3, the surface on the base side of the engaging protrusion is inclined closer to the base as it goes away from the guide protrusion. The flat portion of the cushioning member is formed to be a surface, and the thickness dimension of the one end portion on the guide projection side is such that the thickness dimension decreases toward the side away from the guide projection, and the base of the engagement projection Since it is formed so as to be larger than the interval between the side corner and the inner ring, it is possible to operate the vehicle belt type continuously variable transmission without fixing the buffer member. Further, it is possible to prevent the element from coming out from between the engagement protrusion of the element and the ring. Therefore, it is possible to reliably prevent the outer peripheral surface of the ring from being damaged.

It is a perspective view which shows a part of the circumferential direction of the transmission belt of the belt type continuously variable transmission for vehicles which concerns on this invention. It is a figure which shows the cross section of the direction orthogonal to the longitudinal direction of the 1st ring and 2nd ring which are shown in FIG. 1, and the element and buffer member which were assembled | attached to it. It is an enlarged view which expands and shows the III arrow part of FIG. When the element shown in FIG. 1 is wound around a pulley and rotated in the longitudinal direction, the first ring and the second ring are positioned on the outer peripheral side with respect to the element when being pulled away from the pulley. FIG. It is a figure which shows the conventional power transmission belt, Comprising: It is a figure corresponding to FIG. 4 of a present Example.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified for ease of explanation, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a perspective view showing a part in the circumferential direction of a transmission belt 10 of a belt type continuously variable transmission for a vehicle according to the present invention. As is well known, the belt-type continuously variable transmission includes a driving pulley and a driven pulley (not shown) whose groove widths provided on the input shaft and the output shaft are variable, and the driving pulley and the driven pulley. A transmission belt 10 wound around the V-groove of the pulley and transmitting power between the driving pulley and the driven pulley, and the transmission belt 10 by changing the V-groove width of the driving pulley and the driven pulley. By changing the wrapping diameter, the relative rotation speed ratio between the input shaft and the output shaft is continuously changed to change the speed.

  In FIG. 1, the transmission belt 10 is formed by laminating a plurality of endless annular metal strip members 12 having flexibility, and a first ring 14 and a second ring 16 disposed in parallel to each other. And a plurality of elements 18 made of a plate-like metal connected in a ring shape in the thickness direction along the longitudinal direction of the first ring 14 and the second ring 16. In the first ring 14 and the second ring 16, for example, nine strip-shaped metal members 12 that are adjusted so that the circumferential length sequentially increases from the inner peripheral side toward the outer peripheral side are stacked in order from the inner peripheral side. Become. In FIG. 1, for convenience, the first ring 14 and the second ring 16 are not necessarily shown in nine layers. The same applies to FIGS. 2 to 5 below.

  FIG. 2 is a view showing a cross section in a direction orthogonal to the longitudinal direction (circumferential direction) of the first ring 14 and the second ring 16 shown in FIG. 1 and the elements 18 and the like assembled thereto. 1 and 2, the first ring 14 and the second ring 16 are also referred to as, for example, hoops or bands. For example, a high-tensile steel plate having a thickness of about 0.2 mm is formed into a ring shape, and the arrows in FIGS. The layers are stacked in the thickness direction indicated by a. Further, the first ring 14 and the second ring 16 are formed so that the width dimension in the width direction indicated by the arrow b in FIGS. 1 and 2, the thickness dimension in the thickness direction, and the circumferential length are equal to each other. . The first ring 14 and the second ring 16 are connected to each pulley when the transmission belt 10 is rotated in the circumferential rotation direction indicated by an arrow c in FIG. 1 in a state where the transmission belt 10 is wound around the driving pulley and the driven pulley. The portion spanned between the pulleys can be elastically deformed in a straight line, and the portion wound around each pulley can be elastically deformed into a curved surface having a winding diameter corresponding to the width of the V groove of each pulley.

  The element 18 is also referred to as a block, for example, and is a base portion 18a located on the inner peripheral side of the first ring 14 and the second ring 16, and both end portions in the width direction indicated by arrows b in FIGS. 1 and 2 of the base portion 18a. A pair of guide protrusions 18b that protrude from the outer periphery of the first ring 14 and the second ring 16, that is, opposite to the base 18a, and face each other with the first ring 14 and the second ring 16 in between. The first rings 14 are provided so as to protrude from the tip portions of the pair of guide protrusions 18b toward each other, and the spacing in the width direction between the opposing surfaces 20 is arranged in parallel in the width direction. And a pair of engaging protrusions 18 c provided so as to be smaller than the overall width dimension of the second ring 16.

  The pair of engaging protrusions 18c are for preventing relative movement of the first ring 14 and the second ring 16 to the outer peripheral side with respect to the element 18, that is, the element 18 is the first ring 14 and the second ring 16. The ring is engaged with the ring so as not to come off. Each of the engaging protrusions 18c is formed with an inclined surface 22 which is a surface on the base 18a side and approaches the base 18a as it goes away from the guide protrusion 18b. The intervals between the inclined surfaces 22 and the outer peripheral surfaces 24 of the first ring 14 and the second ring 16 located on the inner peripheral side thereof are made smaller toward the side away from the guide projection 18b.

  An inclined surface 26 is formed on the front side of the base portion 18a of the element 18 in the circumferential rotation direction so as to decrease the thickness of the base portion 18a toward the inner peripheral side, that is, the side opposite to the guide protrusion 18b of the base portion 18a. An angle between the front surface of the element 18 in the circumferential rotation direction and the inclined surface 26 is a well-known so-called rocking edge 28. The locking edge 28 functions as a fulcrum when the element 18 swings relative to the element 18 disposed adjacent to the front of the element 18 in the circumferential rotation direction. That is, of the elements 18 arranged adjacent to each other in the circumferential direction in the circumferential rotation direction, the rear element 18 swings around the fulcrum while the locking edge 28 is in line contact with the back surface of the front element 18. It has become. The elements 18 that are arranged adjacent to each other in the circumferential direction in the circumferential rotation direction include the back surface and the rear surface of the front element 18 in accordance with the shapes of the first ring 14 and the second ring 16 that support them, that is, the degree of bending. The relative positional relationship changes from the state in which the front surface of the element 18 abuts to the state in which the back surface of the front element 18 and the inclined surface 26 of the rear element 18 abut.

  A frustoconical protrusion 30 protruding toward the front side in the circumferential rotation direction is formed in the intermediate portion of the inclined surface 26 in the width direction. The projection 30 is fitted in a fitting hole (not shown) formed on the back surface of the element 18 in front of the projection 30. Thereby, the elements 18 arranged at the front and rear in the circumferential rotation direction are engaged with each other so as to be relatively rotatable around the protrusion 30 and not to be relatively movable in a direction perpendicular to the axis of the protrusion 30. Such an element 18 is made, for example, by being punched from a steel plate of about 1.8 mm and subjected to press working or the like.

  FIG. 3 is an enlarged view showing an enlarged view taken along the line III in FIG. As shown in FIGS. 2 and 3, the transmission belt 10 includes one and the other of the pair of engaging protrusions 18c and the first ring 14 and the second ring 16 (one of the pair of rings) positioned on the inner peripheral side thereof. And a pair of endless buffer members 32 interposed between the other end).

  The buffer member 32 rises from one side edge of the flat portion 32a adjacent to the inclined surface (base side surface) 22 of the engaging protrusion 18c and faces the opposing surface 20 of the engaging protrusion 18c. It is a flexible resin member having an L-shaped cross section integrally having an adjacent rising portion 32b. The flat portion 32a is interposed between the inclined surface 22 of the engaging protrusion 18c and the outer peripheral surface 24 of the ring located on the inner peripheral side thereof. Further, the flat portion 32a has a thickness dimension t at one end portion on the guide protrusion 18b side so that the thickness in the thickness direction indicated by the arrow a in FIGS. 2 and 3 decreases toward the side away from the guide protrusion 18b. Is formed to be larger than the interval s between the corner 34 of the engaging protrusion 18c on the base 18a side and the outer peripheral surface 24 of the ring on the inner peripheral side thereof. As shown in FIG. 3, even if the buffer member 32 moves to the side away from the guide projection 18b in a state where the first ring 14 is in contact with the base 18a, When the surface opposite to the inclined surface 22 of the engaging protrusion 18c comes into contact with the inclined surface 22, further movement to the side away from the guide protrusion 18b is prevented. Thereby, the buffer member 32 is prevented from coming out between the inclined surface 22 of the engaging protrusion 18c and the outer peripheral surface 24 of the ring located on the inner peripheral side thereof. In such a buffer member 32, for example, a flat portion 32a is connected to the inclined surface 22 of the engaging protrusion 18c of the element 18 with respect to the first ring 14 and the second ring 16 in which a plurality of elements 18 are assembled. It is assembled by being fitted between the outer peripheral surface 24 of the ring located on the inner peripheral side using the flexibility of the flat portion 32a.

  The transmission belt 10 configured as described above is rotated in the state in which the drive-side pulley is wound around the drive-side pulley and the driven-side pulley in the vehicle belt-type continuously variable transmission and clamped in the width direction. Therefore, it is rotated in the longitudinal direction. At that time, among the plurality of elements 18, the element 18 positioned at the circumferential position where the transmission belt 10 is separated from the pulley is held by being pressed by the pulley, and thus rotates around the axis of the pulley as it is. try to. However, the element 18 is pulled away from the pulley by the first ring 14 and the second ring 16 that support it, and rotates in the longitudinal direction together with the first ring 14 and the second ring 16. . Here, when the element 18 is pulled away from the pulley, the first ring 14 and the second ring 16 are pulled outward with respect to the element 18. FIG. 4 shows the state. The first ring 14 and the second ring 16 positioned on the outer peripheral side with respect to the element 18 have the outer peripheral surface 24 brought into contact with the corner 36 on the base 18c side of the buffer member 32. The buffer member 32 is made of resin. Therefore, the outer peripheral surface 24 is not damaged.

  Incidentally, FIG. 5 is a view showing a conventional transmission belt 40 in which the buffer member 32 as in the present embodiment is not provided. In the conventional transmission belt 40 without the buffer member 32, the outer peripheral surfaces 24 of the first ring 14 and the second ring 16 positioned on the outer peripheral side with respect to the element 42 are the base portions of the engaging protrusions 42 c of the element 42. 42a is brought into contact with the corner 44 on the side. Therefore, the outer peripheral surface 24 of the first ring 14 and the second ring 16 may be damaged, and the durability of the first ring 14 and the second ring 16 may be reduced.

  As described above, according to the transmission belt 10 of the vehicle belt-type continuously variable transmission of the present embodiment, one and the other of the pair of engaging protrusions 18c and the first ring 14 positioned on the inner peripheral side thereof and Since a pair of endless annular cushioning members 32 interposed between the second ring 16 and the second ring 16 are provided, the first belt 14 and the transmission belt 10 are separated from the V groove of the pulley during rotation in the longitudinal direction. Even if the second ring 16 is pulled toward the outer peripheral side with respect to the element 18, the buffer member 32 is interposed between the outer peripheral surface 24 of the first ring 14 and the second ring 16 and the engaging protrusion 18 c of the element 18. Therefore, the outer peripheral surface 24 can be prevented from being damaged. Therefore, it can suppress that durability of the 1st ring 14 and the 2nd ring 16 resulting from the damage | wound can be suppressed, and durability of the transmission belt 10 is improved.

  Moreover, according to the transmission belt 10 of the present embodiment, the buffer member 32 is positioned adjacent to the inclined surface 22 (surface on the base side) 22 of the engaging protrusion 18c and the inner peripheral side thereof. An L-shaped cross section integrally including a flat portion 32a inserted between the ring and a rising portion 32b that rises from one side edge of the flat portion 32a and is adjacent to the facing surface 20 of the engaging protrusion 18c. Since the member is made of a flexible resin, even after the first ring 14 and the second ring 16 and the element 18 are assembled to each other, the first ring 14 is used by utilizing the flexibility of the buffer member 32. The ring 14 and the second ring 16 and the engaging protrusion 18c of the element 18 can be fitted and assembled.

  Further, according to the transmission belt 10 of the present embodiment, the inclined surface 22 of the engaging protrusion 18c is formed so as to approach the base 18a toward the side away from the guide protrusion 18b, and the flat portion of the buffer member 32. 32a has a thickness dimension t at one end on the guide projection 18b side and a corner 34 on the base 18a side of the engagement projection 18c and its inner circumference so that the thickness decreases toward the side away from the guide projection 18b. Since it is formed so as to be larger than the distance s from the outer peripheral surface 24 of the ring on the side, even if the belt-type continuously variable transmission for a vehicle is operating without fixing the buffer member 32, for example. It is possible to prevent the element 18 from slipping out from between the engagement protrusion 18 c and the first ring 14 and the second ring 16. Therefore, the outer peripheral surface 24 of the first ring 14 and the second ring 16 can be reliably prevented from being damaged.

  As mentioned above, although one Example of this invention was described in detail with reference to drawings, this invention is not limited to this Example, It can implement in another aspect.

  For example, in the above-described embodiment, the buffer member 32 is made of resin, but is not limited thereto, and may be made of, for example, synthetic rubber or a relatively soft metal. In short, any material that is soft enough not to damage the outer peripheral surface 24 even if it contacts the outer peripheral surface 24 of the first ring 14 and the second ring 16 may be used.

  Further, in the above-described embodiment, the first ring 14 and the second ring 16 are formed by laminating the belt-shaped member 12 in which a high-strength steel plate having a thickness of about 0.2 mm is formed into a ring shape. The thickness of the member 12 is not limited to the above, and the material may be other metals such as steel plates or resins.

  Moreover, in the above-mentioned Example, the inclined surface 22 formed in the engagement protrusion 18c of the element 18 does not necessarily need to be provided. Moreover, although the thickness of the flat part 32a of the buffer member 32 was formed so small that it separated from the guide protrusion 18b, it does not necessarily need to be formed in that way. The shape of the inclined surface 22 and the flat portion 32a is to prevent the buffer member 32 from slipping out between the engagement protrusion 18c and the ring without fixing the buffer member 32. May be secured to one of the element 18 or the ring to prevent it from slipping out between the engagement protrusion 18c and the ring.

  Further, in the cross section of the buffer member 32 of the above-described embodiment, the length in the longitudinal direction of the flat portion 32a and the length in the longitudinal direction of the rising portion 32b may be changed from those in FIG.

  In the above-described embodiment, the rising portions 32b of the pair of buffer members 32 may be connected to each other by a connecting member that can be elastically deformed.

  In the above-described embodiment, the buffer member 32 is assembled to the assembly of the first ring 14 and the second ring 16 and the plurality of elements 18. For example, the first ring 14 and the second ring When the element 18 is assembled to the ring 16, it may be assembled together therewith. In this way, at the time of assembling the element 18, the engaging projection 18 c prevents the outer peripheral surface 24 from being in contact with the outer peripheral surface 24 of the first ring 14 and the second ring 16. be able to. Therefore, it can prevent that the durability of the 1st ring 14 and the 2nd ring 16 falls due to the crack of the outer peripheral surface at the time of the above-mentioned attachment.

  It should be noted that the above description is merely an embodiment, and other examples are not illustrated. However, the present invention is implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the gist of the present invention. Can do.

10: Transmission belt 12: Band member 14: First ring (ring)
16: Second ring (ring)
18: Element 18a: Base 18b: Guide projection 18c: Engagement projection 20: Opposing surface 22: Inclined surface (surface on the base side)
32: Buffer member 32a: Flat part 32b: Rising part 34: Angle s: Interval t: Thickness dimension

Claims (3)

A plurality of endless annular belt-like members are laminated, and a pair of rings arranged in parallel with each other;
A plurality of plate-like members that are connected in a ring shape in the thickness direction along the longitudinal direction of the pair of rings, and a base portion located on the inner peripheral side of the pair of rings, and both ends of the base portion in the width direction A pair of guide protrusions that protrude from the outer peripheral sides of the pair of rings and that face each other across the pair of rings, and that protrude from the distal ends of the pair of guide protrusions, respectively, on the side approaching each other A plurality of elements each having a pair of engaging protrusions for preventing relative movement of the pair of rings to the outer peripheral side, a transmission belt of a vehicular belt type continuously variable transmission,
A vehicle comprising: a pair of endless annular cushioning members interposed between one and the other of the pair of engaging protrusions and one and the other of the pair of rings positioned on the inner peripheral side thereof Transmission belt for belt type continuously variable transmission. The endless annular cushioning member is a flat portion adjacent to the base-side surface of the engaging protrusion, and is adjacent to the opposing surfaces of the pair of engaging protrusions rising from one side edge of the flat portion. A flexible resin member having an L-shaped cross section integrally having a rising portion that
2. The transmission belt of a belt type continuously variable transmission for a vehicle according to claim 1, wherein the flat portion is interposed between the base-side surface of the engaging protrusion and the ring. The surface on the base side of the engaging protrusion is formed to be an inclined surface that approaches the base as it goes away from the guide protrusion,
The flat portion of the buffer member has a thickness dimension that decreases toward the side away from the guide projection, and the thickness dimension of one end portion on the guide projection side is a corner on the base side of the engagement projection. The transmission belt for a vehicular belt type continuously variable transmission according to claim 2, wherein the transmission belt is formed so as to be larger than a distance between the ring and the ring on the inner peripheral side.

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