JP2011185304A - Transmission belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission belt excelling in cooling performance by heat radiation even when applied to a dry type belt transmission device not cooled by lubricating oil. <P>SOLUTION: The transmission belt B includes a large number of blocks 1 abutting on belt winding grooves Pv of pulleys P when wound on the pulleys P, and opposing pressure received from the groove surfaces of the belt winding grooves Pv, and bands 2, 3 binding the large number of blocks 1 in the annularly arranged state. The block 1 includes heat radiating fins 8, 9 increasing the surface area of the block 1 to accelerate heat radiation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transmission belt that is wound around two pulleys and transmits power between the pulleys, and more particularly to a dry transmission belt that does not use lubricating oil.

  Of belt transmission devices that transmit power by winding a transmission belt (V-belt) between two pulleys, for example, a transmission belt used in a belt type continuously variable transmission for a vehicle is mainly an element or a block It is classified into a metal belt that is formed by binding a large number of metal plate pieces called steel bands in a ring shape with a steel band, etc., and a non-metal belt that is mainly made of an elastic material such as rubber or resin. Can do.

  When using a metal belt among the above-mentioned various belts, since the pulley is usually made of a metal such as steel, cast iron or aluminum alloy, wear on the friction surface of the metal between the metal belt and the pulley. Lubricating oil is used to prevent burn-in and the like. Therefore, the metal belt in this case is a so-called wet transmission belt used in lubricating oil. On the other hand, in the case of using a non-metallic belt, for example, a rubber belt, it is not necessary to use a lubricating oil such as the above-described wet transmission belt. Therefore, the rubber belt in this case is a so-called dry type transmission belt that transmits power by utilizing frictional force between the belt and the pulley without lubrication with oil.

  During the operation of the belt transmission device using the transmission belt as described above, the temperature of the transmission belt and the pulley rises due to the friction surface between the transmission belt and the pulley and the frictional heat generated inside the belt. Therefore, it is necessary to perform cooling to prevent overheating of the heat generating portions of the transmission belt and the pulley. In the case of a wet transmission belt that uses lubricating oil, the belt and the pulley are lubricated with lubricating oil, and the heat generating portion can be simultaneously cooled with the lubricating oil. On the other hand, in the case of a dry type transmission belt that does not use lubricating oil, for example, the surface area of the part that radiates the heat of the heat generation part into the air is increased, or a cooling structure that efficiently radiates the heat of the heat generation part is provided. There is a need.

  An example of a configuration in which such a cooling structure is provided for a belt-type continuously variable transmission is described in Patent Document 1. The cooling structure of the V-belt type continuously variable transmission described in Patent Document 1 includes a drive pulley mounted on a drive shaft located on the engine side in a case and a driven drive mounted on a driven shaft located on the rear wheel side. A structure in which a V-belt is wound around a pulley so that cooling air introduced into the case flows from the driving pulley side to the driven pulley side, and a plurality of outer surfaces on the opposite side of the driven pulley from the belt-wrapping surface are arranged. The heat radiation fins are formed substantially concentrically.

  Patent Document 2 discloses a continuously variable transmission in which a dry belt is wound between a driving pulley and a driven pulley, and a gear ratio is continuously changed by changing pulley groove widths of both pulleys in opposite directions. A first intake port provided on a side wall of the housing facing the outer surface of the drive pulley, an exhaust port provided on a wall surface of the housing facing the tangential direction of the driven pulley, a drive pulley, Corresponding to the intermediate part between the drive pulley and the driven pulley, which is provided on the outer surface of the driven pulley and generates airflow that discharges the air flowing from the first intake port to the exhaust port by the rotation of the drive pulley and driven pulley An invention relating to a cooling structure for a continuously variable transmission including a second air inlet provided on a side wall of a housing is described.

  In Patent Document 3, a dry belt is wound between a driving pulley and a driven pulley, and the gear ratio variable mechanism that makes the pulley groove widths of both pulleys variable in opposite directions, and the above dry belt are pressed. A continuously variable transmission provided with a tensioner device for obtaining belt tension, and an air intake is provided in a portion of the transmission case corresponding to the outside of the tensioner device, and a hole for passing cooling air is provided in the tensioner arm. An air exhaust port is provided on the outer side of the driven pulley in the radial direction and on the opposite side of the transmission case across the air intake port and the driven pulley, and further from the air intake port to the air exhaust port on the rear surface of the driven pulley. A configuration in which fins for generating a flowing airflow are provided is described.

Japanese Patent Laid-Open No. 2004-232805 Japanese Patent Laid-Open No. 2004-286047 JP 2003-74655 A

  In the belt-type continuously variable transmission and its cooling structure described in each of the above patent documents, a pulley or belt is provided by providing fins for heat dissipation or airflow generation on the rear surface of the pulley (the outer surface opposite to the pulley groove). The cooling is done. Therefore, by increasing the surface area of the heat radiation portion of the pulley with the heat radiation fin, the pulley can be efficiently radiated and cooled from the heat radiation fin. Alternatively, by causing the air in the transmission case to flow with the fins for generating airflow, the heat radiation of the pulleys and the belt can be promoted, and the pulleys and the belt can be effectively radiated and cooled.

  When the pulley and belt are cooled as described above, the surface area of the pulley is larger than that of the belt. Also, as in the configuration described in Patent Document 1, a fin for heat radiation is directly provided on the pulley. Thus, the pulley can be cooled by heat radiation relatively easily. On the other hand, since the belt has a smaller surface area than the pulley, the cooling effect due to heat radiation is reduced accordingly. For this reason, the conventional technology relating to the cooling of the belt type continuously variable transmission as described in each of the above patent documents can be expected to have a cooling effect due to heat radiation to the pulley, but a sufficient cooling effect can be obtained for the belt. It may not be possible. As described above, there is still room for improvement in order to effectively cool the pulley and the transmission belt constituting the belt transmission device, particularly for the dry transmission belt that does not use the lubricating oil.

  The present invention has been made paying attention to the above technical problem, and provides a transmission belt having excellent cooling performance by heat dissipation even when applied to a dry belt transmission device that does not perform cooling by lubricating oil. It is intended to do.

  In order to achieve the above object, the invention of claim 1 is directed to a plurality of blocks that abut against the belt winding groove of the pulley and wind against the pressure received from the groove surface of the belt winding groove. And a transmission belt comprising a band that holds the multiple blocks in an annular arrangement, wherein the blocks are formed with radiating fins that increase the surface area of the blocks and promote heat dissipation. It is a transmission belt.

  According to a second aspect of the present invention, in the first aspect of the present invention, the heat radiating fins may include an upper surface of the block constituting the outer peripheral surface of the transmission belt and / or an inner peripheral surface of the transmission belt. A power transmission belt formed on a lower surface.

  According to the first aspect of the present invention, the heat dissipating fins are provided in the block that constitutes the transmission belt together with the band, so that the surface area of the block is increased, and the heat of the block is easily radiated to the outside. Therefore, the frictional heat generated at the contact surface between the block and pulley and the frictional heat generated inside the band when the band is bent and stretched during running of the transmission belt are effectively radiated to the outside through the heat dissipation fins of the block. Can be made. Therefore, the cooling performance by heat dissipation of the transmission belt can be improved, and as a result, the temperature increase of the transmission belt during traveling can be prevented or suppressed.

  According to the second aspect of the present invention, the radiating fin is formed on the upper surface and / or the lower surface of the block, that is, on the outer peripheral surface and / or the inner peripheral surface of the transmission belt. Therefore, when the transmission belt is wound around the pulley, it is possible to avoid the radiation fins from interfering with the pulley and other members, and to improve the cooling performance by the heat radiation of the transmission belt.

It is a schematic diagram which shows the structural example of the power transmission belt which concerns on this invention, Comprising: It is the front view which shows the structure of a block, and sectional drawing which shows the structure of a band. It is a schematic diagram which shows the structural example of the power transmission belt which concerns on this invention, Comprising: It is a side view which shows the structure of a block especially. It is a schematic diagram which shows the structural example of the power transmission belt which concerns on this invention, Comprising: It is a perspective view which shows the structure of a block and a band.

  Next, the present invention will be specifically described with reference to the drawings. The power transmission belt of the present invention is used in, for example, a belt-type continuously variable transmission, and is sandwiched in a winding groove having a V-shaped cross section formed on the outer peripheral portion of the pulley. Torque is transmitted by friction force generated between the two. An example of this is schematically shown in FIGS. 1 and 2, the transmission belt B is wound around pulleys (a driving pulley and a driven pulley) constituting a belt type continuously variable transmission. These pulleys P are arranged so that a fixed sheave and a movable sheave each having a tapered surface face each other, so that a belt winding groove (V-shaped groove) Pv having a V-shaped cross section is formed between these sheaves. The movable sheave is formed and moved back and forth with respect to the fixed sheave by an actuator (not shown) such as a hydraulic cylinder, thereby changing the width of the belt winding groove Pv.

  When the transmission belt B is wound around the pulley P, the transmission belt B abuts against the belt winding groove Pv of the pulley P, and a plurality of blocks 1 that counteract the pressure received from the groove surface of the belt winding groove Pv, and the plurality of blocks 1 It is comprised from the two bands 2 and 3 for hold | maintaining cyclic | annular form.

  The block 1 is formed by coating a resin or the like on a plate-shaped member made of metal such as steel or aluminum alloy. Alternatively, a high-strength synthetic resin or the like can be integrally formed as a material. The left and right side surfaces 4 and 5 in the belt width direction (left and right direction in FIG. 1) of the block 1 are formed as tapered inclined surfaces so as to come into contact with the belt winding groove Pv of the pulley P. It has become.

  As described above, the block 1 is formed of a member having a predetermined rigidity made of metal, resin, or the like. Therefore, when the transmission belt B is wound around the pulley P, the left and right side surfaces 4 and 5 of the block 1 come into contact with the belt winding groove Pv of the pulley P, and the block 1 extends from the groove surface of the belt winding groove Pv. It is designed to resist the pressure it receives. If the base material of the block 1 is made of metal, the surface is coated with the resin as described above, so that even if the pulley P is made of metal such as steel or cast metal, the transmission belt is connected to the pulley P. When B is wound around, contact between metals is avoided. Therefore, wear or seizure at the contact portion between the pulley P and the transmission belt B can be prevented or suppressed.

  On the left and right sides of the central portion in the height direction of the block 1 (vertical direction in FIG. 1), opening grooves 6 and 7 are formed that open at both side surfaces 4 and 5, respectively. The bands 2 and 3 are accommodated in the opening grooves 6 and 7, respectively. Therefore, when the bands 2 and 3 are inserted into the opening grooves 6 and 7 of the block 1 in the belt width direction, a large number of the blocks 1 are held in an annularly aligned state, and the transmission belt B is It is configured.

  Since the blocks 1 are arranged in a ring shape, there are always places where the blocks 1 are arranged in a so-called fan-shaped (radially) open state around the center of curvature of the transmission belt B without being parallel. Therefore, in order to enable an arrangement in which the blocks 1 are fan-shaped with the blocks 1 in contact with each other, each block 1 has a lower portion in FIG. 1 and FIG. Is formed thin. That is, the thickness of the front surface (left surface in FIG. 2) 1f of the block 1 is reduced in a state where the lower portion is scraped off from the vicinity of the center in the height direction of the block 1.

  Although not shown, a positioning structure such as a tenon and a tenon groove is provided between the block 1 and the bands 2 and 3, and the block 1 in the belt circumferential direction (left and right direction in FIG. 2) You may comprise so that the relative movement with the bands 2 and 3 may be controlled. By providing such a positioning structure, the transmission belt B can be configured by arranging a large number of blocks 1 at equal intervals in the belt circumferential direction, and the traveling of the transmission belt B can be stabilized.

  The bands 2 and 3 are annular belt-like bodies, and are formed as an annular member having predetermined flexibility or flexibility by an elastic member made of, for example, rubber or resin. The bands 2 and 3 are made of an elastic material having a strength necessary for achieving the strength required for the transmission belt B and a softness or flexibility necessary for smoothly winding the pulley P. As long as it is configured as a member, it may be configured of a material other than the rubber or resin as described above. For example, it may be composed of a composite material obtained by synthesizing a fiber, a metal wire, or the like with a rubber or resin as a core material.

  The outer sides of the bands 2 and 3 in the belt width direction, that is, the side surfaces 2a and 3a on the side facing the belt winding groove Pv of the pulley P are tapered in the same manner as the left and right side surfaces 4 and 5 of the block 1, respectively. It is formed as a curved surface and comes into contact with the belt winding groove Pv of the pulley P. In FIG. 1, for convenience, the state immediately before the transmission belt B is wound around the pulley P, that is, the belt winding groove Pv of the pulley P, the side surfaces 4 and 5 of the block 1, and the side surfaces 2 a and 3 a of the bands 2 and 3. The state immediately before abutting is shown. In this state, as shown in FIG. 1, the side surfaces 2 a and 3 a of the bands 2 and 3 protrude outside the side surfaces 4 and 5 of the block 1. This is because the rigidity of the bands 2 and 3 made of an elastic member such as rubber is lower than that of the block 1 formed as a rigid body to face the pressure received from the belt winding groove Pv of the pulley P. When the transmission belt B is wound around the pulley P, the bands 2 and 3 are compressed by the pressure received from the belt winding groove Pv, and the side surfaces 4 and 5 of the block 1 and the bands 2 and 3 are substantially compressed. This is because the side surfaces 2a and 3a are flush with each other and come into contact with the belt winding groove Pv of the pulley P.

  Therefore, when this transmission belt B is wound around the pulley P, the block 1 opposes the pressure received from the belt winding groove Pv of the pulley P, and the side surfaces 2a and 3a of the bands 2 and 3 are connected to the belt. A large frictional force is generated between the side surfaces 2a and 3a and the belt winding groove Pv by being crimped to the winding groove Pv. Therefore, for example, the power transmission between the pulley P and the transmission belt B can be reliably performed by a large frictional force while resisting the high pressure that the transmission belt B receives from the pulley P, such as a pinching pressure. While ensuring a large transmission torque capacity, a transmission belt B having excellent power transmission efficiency can be configured.

  The block 1 of the transmission belt B of the present invention includes an upper surface 1a of the block 1 that forms the outer peripheral surface of the transmission belt B and a lower surface 1b of the block 1 that forms the inner peripheral surface of the transmission belt B, respectively. Radiation fins 8 and 9 are formed to increase the surface area of the substrate and promote heat dissipation.

  As described above, when the transmission belt B travels while being wound around the pulley P, the contact between the block 1 and the pulley P is caused by friction between the side surfaces 4 and 5 of the block 1 and the belt winding groove Pv. Heat is generated in the part. Further, by repeating the state in which the transmission belt B is wound around the pulley P and the state in which the transmission belt B is released from the pulley P to be linear, the bands 2 and 3 are repeatedly bent and stretched. Heat is generated inside the bands 2 and 3 due to friction.

  Therefore, when the transmission belt B is wound around the pulley P and travels, the temperature of the transmission belt B is caused by the heat generated in the contact portion between the block 1 and the pulley P and the bands 2 and 3 as described above. To rise. If the temperature of the transmission belt B rises excessively, the resin or rubber used as the material for the block 1 or the band 2 or 3 may be deteriorated by heat. Therefore, in the transmission belt B of the present invention, by providing the heat dissipating fins 8 and 9 in the block 1 as described above, the heat dissipation of the block 1 is improved and the temperature rise during operation of the transmission belt B is suppressed. Can do.

  The radiating fins 8 and 9 are for increasing the surface area of the block 1 and improving the heat radiating property as described above, and are the same material as the main body (base material) portion of the block 1 or have good thermal conductivity. The material is integrally provided on the main body (base material) of the block 1. In addition, the shape and dimensions of the radiating fins 8 and 9, or their attachment positions are set as appropriate so as not to interfere with the pulley P and other members of the belt type continuously variable transmission using the transmission belt B. Can do.

  As described above, when the heat dissipating fins 8 and 9 are provided on the upper surface 1a and the lower surface 1b of the block 1, the air flow generated when the pulley P rotates and the transmission belt B travels as shown in FIG. The cooling air hits the radiation fins 8 and 9. Therefore, the heat of the block 1 is effectively radiated to the outside through the radiation fins 8 and 9. Further, the heat of the bands 2 and 3 is also transmitted between the bands 2 and 3 and the block 1 and is radiated to the outside through the block 1 and its heat radiation fins 8 and 9. Therefore, the heat dissipation performance of the block 1 and the bands 2 and 3 is improved, and as a result, the temperature rise of the transmission belt B can be suppressed.

  1 and 3 show an example in which four radiating fins 8 are provided on the upper surface 1a of the block 1 and three radiating fins 9 are provided on the lower surface 1b of the block 1. The number of the radiating fins 8 and 9 is not limited to this, and can be appropriately set in consideration of interference with the pulley P and other members and the radiating performance as described above. Moreover, the structure provided in only the upper surface 1a side of the block 1 may be sufficient as the radiation fin in this invention, and the structure provided only in the lower surface 1b of the block 1 may be sufficient.

  As described above, according to the transmission belt B of the present invention, the heat dissipating fins 8 and 9 are provided in the block 1 constituting the transmission belt B together with the bands 2 and 3, thereby increasing the surface area of the block 1. The heat of the block 1 is easily radiated to the outside. Accordingly, the frictional heat generated at the contact surface between the block 1 and the pulley P when the transmission belt B travels, the frictional heat generated inside the bands 2 and 3 when the bands 2 and 3 are bent and stretched, etc. It is possible to effectively dissipate heat to the outside through one heat radiation fin 8, 9. Therefore, the cooling performance by heat dissipation of the transmission belt B can be improved. As a result, overheating of the transmission belt B during traveling can be prevented, and deterioration of materials such as rubber and resin used for the block 1 and the bands 2 and 3 can be prevented or suppressed. As a result, the durability of the transmission belt B can be reduced. Can be improved.

  The present invention is not limited to the specific examples described above. For example, in the above-described specific examples, the configuration in which the transmission belt according to the present invention is applied to a belt type continuously variable transmission is described as an example. However, the transmission belt according to the present invention is a belt type continuously variable transmission. However, the present invention can be applied as a power transmission belt in other winding transmission devices (belt transmission devices) constituted by belts and pulleys.

  DESCRIPTION OF SYMBOLS 1 ... Block, 1a ... Upper surface, 1b ... Lower surface, 2, 3 ... Band, 8, 9 ... Radiation fin, B ... Power transmission belt, P ... Pulley, Pv ... Belt winding groove

Claims (2)

A number of blocks that abut against the belt winding groove of the pulley when wound on the pulley and resist pressure received from the groove surface of the belt winding groove, and a band that holds the plurality of blocks in an annular arrangement In the transmission belt with
A power transmission belt, wherein heat radiation fins that increase heat radiation by increasing the surface area of the block are formed on the block.   The said radiation fin is formed in the upper surface of the said block which comprises the outer peripheral surface of the said transmission belt, and / or the lower surface of the said block which comprises the inner peripheral surface of the said transmission belt. Power transmission belt.

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