JP6221045B2 - Metal belt for continuously variable transmission - Google Patents

Description

  The present invention relates to a metal belt for a continuously variable transmission used in a state of being wound around a pair of pulleys, and in particular, for a continuously variable transmission formed by arranging a plurality of elements along an endless annular body. It relates to a metal belt.

  At present, a push type belt, which is mainly used as a CVT (Continuously Variable Transmission) belt, is composed of a metal frame called an element and a metal ring called a ring for bundling it. Specifically, a metal V-belt as disclosed in Patent Document 1 below is provided. This prior art is intended to rationally reduce the weight of the metal V-belt element while maintaining the necessary and sufficient strength.

  The metal V-belt element disclosed in the following Patent Document 1 is provided with a protrusion on the surface for engaging adjacently arranged elements, and a recess for receiving the protrusion is provided on the back surface. It has been. The protrusions and the recesses are engaged to form a plurality of elements. Further, the metal V-belt disclosed in Patent Document 1 below is used by applying a thrust (clamping pressure) from the V-groove surface of the pulley to the V-surface of the element in order to prevent belt slip.

JP 2000-55136 A

  By the way, the present inventor examined the durability of the element with respect to the metal V belt of the prior art disclosed in the above-mentioned Patent Document 1, and provided the above-described protrusions and recesses on the front and back surfaces of the element, respectively. In some cases, the inventors obtained technical knowledge that the element bends in one direction when a thrust (clamping pressure) is applied to the element from the pulley. More specifically, it was found that the element bends in a convex shape from the back surface to the front surface.

  In addition, further bending occurs in the element due to the torque load, but the direction of the generated bending coincides with the direction of bending generated by the thrust load, and an excessive input other than normal is applied to the element from the pulley, It was found that the element could reach the plastic zone and cause plastic deformation. When the element is plastically deformed, there is a problem that the durability of the element is reduced.

  Accordingly, an object of the present invention is to provide a metal belt for a continuously variable transmission that can suppress the occurrence of bending due to a thrust load and prevent a decrease in durability of an element due to an excessive input load.

The metal belt for continuously variable transmission according to the present invention provided to solve the above-described problem includes a plurality of elements each having a protrusion formed on one surface and a recess formed on the other surface along the endless annular body. A metal belt for a continuously variable transmission that is formed in an annular shape by being disposed and used in a state of being wound between a pair of pulleys, wherein the plurality of elements are adjacent to one another in the circumferential direction of the pulleys The protrusions of the other elements are stacked in a state of being fitted in the recesses of the other element, and the contact portions of the side surfaces of the respective elements that come into contact with the pulley grooves are tapered in the circumferential direction of the pulley. It has a shape.

In the metal belt for continuously variable transmission according to the present invention, the contact portion on which the pinching pressure is applied by contact with the pulley has a tapered shape whose diameter is increased in the circumferential direction of the pulley . More this tapered element can be subjected to when being loaded thrust from the pulley (clamping pressure) to the contact portion, a bending load in the circumferential direction in a convex shape of the pulley. Therefore, unlike the conventional, even took the load in the opposite direction, "circumferential direction of the pulley" to the element, the bending load, to offset the bending load of the "circumferential direction of the pulley" according to the tapered shape (Balance). As a result, it is possible to suppress the occurrence of bending of the element due to the thrust load, and to prevent a decrease in the durability of the element due to an excessive input load.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the bending by the element by thrust load can be suppressed, and the metal belt for continuously variable transmissions which can prevent the durability fall of the element by excessive input load can be provided.

(A) is a front view which shows the state which mounted | wore the continuously variable transmission type pulley with the metal belt for continuously variable transmission which concerns on one Embodiment of this invention, (b) is the metal belt for continuously variable transmission of (a). (C) is explanatory drawing which shows the state which wound the metal belt for continuously variable transmission around the pulley. (A) Top view of a conventional element, which is a schematic view for explaining various forces acting on the conventional element, (b) A top view of the element of the present invention, and the element of the present invention It is a schematic diagram for demonstrating the various force which acts on.

  Hereinafter, a continuously variable transmission metal belt 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1A, the continuously variable transmission metal belt 10 is used in a state of being wound around a pair of pulleys P1 and P2 constituting the continuously variable transmission. As shown in FIG. 1 (b), the continuously variable transmission metal belt 10 includes a plurality of elements 20 with respect to a hoop 12 (endless annular body) formed by laminating a plurality of metal plates into an annular shape. It is formed by mounting in a state of being connected.

  The number of the elements 20 constituting the continuously variable transmission metal belt 10 may be any number, but in the present embodiment, about 400 elements 20 constitute the continuously variable transmission metal belt 10.

  The element 20 is composed of a steel plate. As shown in FIGS. 1B and 1C, the element 20 has a side portion 22a that can be brought into contact with the grooves D of the pulleys P1 and P2 so as to be sandwiched between the pulleys P1 and P2 of the continuously variable transmission. , 22b (contact part), and a head part 26 connected to the body part 22 via a pillar part 24. Saddle portions 28 for receiving the hoops 12 are formed on both sides of the pillar portion 24 and between the body portion 22 and the head portion 26.

  FIG. 2B is a top view of the element 20 of the present embodiment. As shown in FIG. 2B, the head portion 26 has a protrusion 26b formed on one surface 26a and a recess 26d formed on the other surface 26c.

  Each element 20 can be aligned by inserting a projection 26b into the recess 26d. In addition, the side portions 22a and 22b have a tapered shape whose diameter is increased from one surface 26a toward the other surface 26c.

  Next, the result of a comparison between the element 20 of this embodiment (see FIG. 2B) and the conventional element 120 (see FIG. 2A) is shown. Hereinafter, the pulleys P1 and P2 may be simply abbreviated as pulleys.

  FIG. 2A is a top view of the conventional element 120 and is a schematic diagram for explaining various forces acting on the conventional element 120. In addition, the arrow in Fig.2 (a) shows the direction where thrust (clamping pressure) is loaded by pulleys P1 and P2, and the white arrow in Fig.2 (a) shows the direction where the bending load L1 is applied. . Moreover, the dashed-dotted line in Fig.2 (a) shows the external line of the element 120 of the bent state.

  First, in the conventional element 120 shown in FIG. 2A, the inventor provided the protrusion 126b and the recess 126d on the one surface 126a and the other surface 126c, respectively, from the pulley to the side portions 122a and 122b. When a thrust is applied, a bending load L1 from one surface 126a toward the other surface 126c is applied, and the technical knowledge that the element 120 bends in a convex shape has been obtained.

  From the knowledge here, the present inventor has found that the direction of further bending generated in the element 120 due to the torque load coincides with the direction of bending generated due to the thrust load, and an excessive input other than normal is input from the pulley to the element 120. It has been found that when loaded, the element 120 can reach the plastic zone and cause plastic deformation.

  Next, FIG. 2B shows a state in which the clamping force (thrust) is applied to the side portions 22a and 22b from the pulleys P1 and P2 in the element 20 of the present embodiment. In addition, the arrow in FIG.2 (b) shows the direction where thrust (clamping pressure) is loaded, and the white arrow in FIG.2 (b) shows the direction where the bending load L2 is applied. Moreover, the dashed-dotted line in FIG.2 (b) shows the external line of the element 20 in the state bent virtually.

  Here, it has been found that the element 20 of the present embodiment is kept stationary without being bent like the conventional element 120. From this result, the present inventor adds a shape in which the bending load L2 is applied in the direction opposite to the direction in which the bending load L1 is applied to the element 20 of the present embodiment, more specifically, the side portions 22a and 22b. Because of the tapered shape, when a thrust (clamping pressure) is applied to the side portions 22a and 22b from the pulley, the bending load L2 is directed from the other surface 26c toward the one surface 26a (opposite to the direction in which the bending load L1 is applied). This bending load L2 is offset (balanced) with the bending load L1, and it is considered that the stationary state is maintained.

  As described above, in the continuously variable transmission metal belt 10 of the present embodiment, the side portions 22a and 22b that can come into contact with the grooves D of the pulleys P1 and P2 are formed from the one surface 26a of the head portion 26 to the other. It has a tapered shape whose diameter is increased toward the surface 26c. Thereby, when the thrust from the pulleys P1 and P2 is loaded on the side portions 22a and 22b of the element 20, the bending load L2 that is convex in the direction from the one surface 26a of the head portion 26 to the other surface 26c is applied. Can be hung.

  Therefore, even if a convex bending load is applied in the direction from the other surface 26c to the one surface 26a as in the prior art, this bending load can be offset (balanced) with the bending load L2. As a result, it is possible to suppress the occurrence of bending in the element 20 due to a thrust load, and to prevent a decrease in durability of the element 20 due to an excessive input load.

  Further, in the continuously variable transmission metal belt 10 of the present embodiment, by adding a shape in which the bending load L2 is applied in the direction opposite to the direction in which the bending load L1 is applied to the element 20, the maximum bending amplitude and the pulley One-side wear on the contact surface can be suppressed, and the durability of the element 20 can be improved.

  As mentioned above, although embodiment of this invention was described based on drawing, a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  The metal belt for continuously variable transmission of the present invention can be suitably used in a vehicle equipped with a CVT.

10 Metal belt for continuously variable transmission 12 Hoop (endless ring)
20 Element 22a, 22b Side (contact part)
26a, 26c surface 26b protrusion 26d recess P1, P2 pulley

Claims (1)

A plurality of elements having protrusions formed on one surface and recesses formed on the other surface are arranged in an annular shape along an endless annular body, and are used in a state of being hung between a pair of pulleys. A metal belt for a continuously variable transmission,
The plurality of elements are stacked in a state in which the protrusions of one element adjacent in the circumferential direction of the pulley are fitted in the recesses of the other element,
A metal belt for a continuously variable transmission, wherein a contact portion on a side surface of each element that contacts a groove of the pulley has a tapered shape whose diameter is increased in a circumferential direction of the pulley .

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