JP6212810B2 - Chain type continuously variable transmission - Google Patents

Description

  In the present invention, an endless chain that is wound between pulleys whose groove width can be changed to transmit a driving force is arranged in an axial direction, and a plurality of cradle pins whose both ends are in contact with the V surface of the pulley, and a shaft A plurality of link plates stacked endlessly to connect the plurality of cradle pins in an endless manner, and an end link plate fixed to the cradle pin and positioned at an axial end of the plurality of link plates. The present invention relates to a chain type continuously variable transmission including a retainer pin that stops.

  In such a chain-type continuously variable transmission, two pairs that are paired in order to prevent the retainer pin and the link plate from being disengaged when the chain bend angle increases and the cradle pin from falling off the link plate. According to the following Patent Document 1, the two cradle pins that make a pair are prevented from being displaced in the axial direction by fitting a protrusion formed on one of the cradle pins into a notch formed on the other. It is known.

Japanese Patent No. 4780368

  By the way, in such a chain type continuously variable transmission chain, two link plates positioned at both ends in the axial direction are not dropped from the cradle pins among a plurality of link plates supported by the cradle pins in the axially stacked state. Since the retainer pin that is locked in this manner is fixed to the outer peripheral surface of the cradle pin by means of welding or the like, if the retainer pin repeatedly contacts the link plate, it may fall off the cradle pin due to peeling of the weld or the like. It was.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to increase the durability of a retainer pin by suppressing contact between a link plate and a retainer pin in a chain type continuously variable transmission chain.

  In order to achieve the above object, according to the invention described in claim 1, an endless chain that is wound between pulleys that can change the groove width and transmits a driving force is disposed in the axial direction. A plurality of cradle pins whose both ends are in contact with the V surface of the pulley, a plurality of link plates that are stacked in an axial direction and endlessly connect the plurality of cradle pins, and a plurality of link plates that are fixed to the cradle pins A chain-type continuously variable transmission including a retainer pin that locks an end link plate positioned at an end portion in the axial direction, wherein the end link plate is in a position where the chain is wound around the pulley. A chain type continuously variable transmission is proposed in which a gap is formed between the retainer pin and the end link plate when contacting the V surface of the pulley. .

  According to the invention described in claim 2, in addition to the configuration of claim 1, the end link plate includes a protrusion that protrudes outward in the axial direction at the radially inner end, and the protrusion is the pulley. A chain type continuously variable transmission is proposed, which is in contact with the V-plane.

  According to the invention described in claim 3, in addition to the configuration of claim 2, the end link plate is provided with a protruding portion protruding outward in the axial direction at the radially outer end of the end link plate. A chain type continuously variable transmission is proposed in which when the protrusion comes into contact with the V surface of the pulley, the protrusion at the radially outer end also comes into contact with the V surface of the pulley.

  According to the invention described in claim 4, in addition to the configuration of claim 2, the end link plate includes protrusions protruding outward in the axial direction at both ends in the front-rear direction, and the protrusion at the radially inner end. A chain type continuously variable transmission is proposed in which the protrusions at both ends in the front-rear direction also contact the V surface of the pulley when the portion contacts the V surface of the pulley.

  According to a fifth aspect of the present invention, in addition to the configuration of any one of the second to fourth aspects, the end link plate is bent to form the protrusion. A chain type continuously variable transmission is proposed.

  The driving pulley 13 and the driven pulley 14 of the embodiment correspond to the pulley of the present invention.

  According to the configuration of the first aspect, in the chain type continuously variable transmission, an endless chain that is wound between pulleys whose groove width can be changed and transmits a driving force is arranged in the axial direction, and both ends are pulleys. A plurality of cradle pins that are in contact with the V-plane, a plurality of link plates that are stacked in the axial direction and endlessly connect the plurality of cradle pins, and an axial end portion of the plurality of link plates that is fixed to the cradle pins And a retainer pin for locking the end link plate located at the position.

  A gap is formed between the retainer pin and the end link plate when the end link plate comes in contact with the pulley's V surface at the position where the chain winds around the pulley, so the end link plate and the pulley's V surface , The contact between the retainer pin and the end link plate can be avoided, the load applied to the retainer pin can be prevented, and the durability of the retainer pin can be enhanced.

  According to the second aspect of the present invention, the end link plate is provided with a protrusion protruding outward in the axial direction at the radially inner end of the end link plate, and the protrusion contacts the V surface of the pulley. Even if the inner end is not extended inward in the radial direction, the tip of the protrusion can be brought close to the V surface, and the end link plate can be slightly tilted so that the tip of the protrusion contacts the V surface. Thus, contact between the retainer pin and the end link plate can be avoided more reliably.

  According to the third aspect of the present invention, the radially outer end of the end link plate is provided with a protruding portion protruding outward in the axial direction, and the protruding portion at the radially inner end contacts the V surface of the pulley in the radial direction. Since the protrusions on the outer end also contact the V surface of the pulley, the load received by the end link plate from the V surface of the pulley is distributed to the radially inner and outer end protrusions, reducing the strength of these protrusions. Durability can be secured while suppressing.

  According to the fourth aspect of the present invention, the front and rear ends of the end link plate are provided with protrusions that protrude outward in the axial direction, and both ends in the front and rear direction when the protrusion at the radially inner end contacts the V surface of the pulley. Since the protrusions of this part also contact the V surface of the pulley, the load received by the end link plate from the V surface of the pulley is distributed to the protrusions at the radially inner end and the front and rear ends, and the strength of these protrusions is kept small. Durability can be ensured. Moreover, when the chain bites into the V surface of the pulley, the front-rear direction front projection comes into contact with the V surface of the pulley before the cradle pin, so that the cradle pin is positioned with the end link plate positioned in the axial direction. By contacting the V surface of the pulley, the retainer pin can be more reliably prevented from contacting the end link plate.

  Further, according to the configuration of the fifth aspect, the end link plate is bent to form the projection, so that a special part for forming the projection is not necessary, and the number of parts and assembly man-hours can be reduced. .

The figure which shows the whole structure of a chain type continuously variable transmission. (First embodiment) FIG. 2 is an enlarged view of part 2 of FIG. 1. (First embodiment) FIG. 3 is a three-direction arrow view of FIG. 2. (First embodiment) FIG. 4 is a sectional view taken along line 4-4 of FIG. (First embodiment) The figure corresponding to FIG. (Second Embodiment) The figure corresponding to FIG. (Second Embodiment) The figure corresponding to FIG. (Third embodiment) The figure corresponding to FIG. (Third embodiment) The figure corresponding to FIG. (Fourth embodiment) The figure corresponding to FIG. (Fourth embodiment) The figure corresponding to FIG. (Fifth embodiment) The figure corresponding to FIG. (Fifth embodiment) The figure corresponding to FIG. (Sixth embodiment) The figure corresponding to FIG. (Sixth embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In this specification, the axial direction refers to the axial direction of the input shaft 11 and the output shaft 12, the radial direction refers to the radial direction of the drive pulley 13 and the driven pulley 14, and the front-rear direction moves the chain 15. Defined as pointing in direction.

  As shown in FIG. 1, the chain type continuously variable transmission T includes an input shaft 11 connected to the engine E and an output shaft 12 arranged in parallel to the input shaft 11. A chain 15 is wound around a drive pulley 13 provided on the drive shaft 14 and a driven pulley 14 provided on the output shaft 12. The drive pulley 13 includes a fixed pulley half 13a fixed to the input shaft 11, and a movable pulley half 13b that can move in the axial direction with hydraulic pressure relative to the fixed pulley half 13a. Consists of a fixed pulley half 14a fixed to the output shaft 12 and a movable pulley half 14b that can move in the axial direction hydraulically relative to the fixed pulley half 14a. When the groove width of the drive pulley 13 is increased and the groove width of the driven pulley 14 is decreased, the transmission ratio between the input shaft 11 and the output shaft 12 is continuously reduced, and the groove width of the drive pulley 13 is decreased to be driven. When the groove width of the pulley 14 is increased, the gear ratio between the input shaft 11 and the output shaft 12 is increased steplessly.

  2 to 4, the chain 15 includes a plurality of link plates 16 and a plurality of cradle pins 17 that connect the plurality of link plates 16 in an endless manner. Each cradle pin 17 arranged in the axial direction is formed by a pair of non-circular cross-section pins 18, 18, and each pin 18 has a first outer peripheral surface 18 a, a second outer peripheral surface 18 b, and a drive A pair of pulley abutting surfaces 18c, 18c inclined with respect to the axial direction and abutting against the V surfaces 19, 19 of the pulley 13 and the driven pulley 14 (hereinafter referred to as the pulleys 13, 14) are provided. The two single pins 18, 18 forming a pair are arranged in opposite directions so that their second outer peripheral surfaces 18 b, 18 b are in contact with each other so as to be able to roll.

  Each link plate 16 is made of a flat plate having an opening 16a at the center, and the rear end of the opening 16a of the front link plate 16 is fitted to the first outer peripheral surface 18a of the single pin 18 on the rear side of the cradle pin 17. In addition, the front link plate 16 and the rear link plate 16 are arranged so that the front end of the opening 16a of the rear link plate 16 is fitted to the first outer peripheral surface 18a of the single pin 18 on the front side of the cradle pin 17. The endless chain 15 is assembled by alternately superimposing them in the axial direction.

  At this time, retainer pins 20, 20 projecting radially outward from both ends of the pin unit 18 of the cradle pin 17 in the axial direction are provided so that the link plate 16 does not fall off from the cradle pin 17 in the axial direction. A pair of link plates 16 and 16 (hereinafter referred to as end link plates 16E and 16E) positioned at both ends in the axial direction are locked by these retainer pins 20 and 20 so as not to drop off. . The end link plate 16E of the present embodiment is a member having the same shape as the other link plates 16.

  Next, the operation of the first embodiment of the present invention having the above configuration will be described.

  As shown in FIG. 4, in the portion where the chain 15 is wound around the pulleys 13, 14, the pulley contact surfaces 18 c, 18 c at both axial ends of the single pin 18 constituting the cradle pin 17 of the chain 15 The four fixed pulley halves 13a and 14a and the movable pulley halves 13b and 14b are sandwiched between a pair of V surfaces 19 and 19, respectively.

  At this time, the axial length of the cradle pin 17 and the total axial thickness of the plurality of link plates 16 stacked on the cradle pin 17 are opposed to the radially inner end 16b of the end link plate 16E. It is set so that a slight gap α is generated between the V surface 19 or light contact with the V surface 19. On the other hand, a gap β sufficiently larger than the gap α is formed between the retainer pin 20 fixed to the cradle pin 17 and the end link plate 16E.

  Therefore, when the chain 15 is clamped between the pair of V surfaces 19 and 19 of the pulleys 13 and 14 in a correct posture, the retainer pin 20 is prevented from coming into contact with the end link plate 16E. In addition, even when the pulleys 13 and 14 are deformed by the reaction load received from the chain 15 and the chain 15 is tilted in the direction of arrow A in FIG. 4, there is a margin corresponding to the gap β. Contact with the end link plate 16E is prevented. Thereby, the retainer pin 20 can be prevented from repeatedly contacting the end link plate 16E, and the durability of the retainer pin 20 can be enhanced.

  In addition, although the retainer pin 20 is fixed at any position on the outer peripheral surface of the cradle pin 17, the function of preventing the link plate 16 from falling off from the cradle pin 17 is not changed, but in the present embodiment, the cradle pin 17 The retainer pin 20 is fixed to the outermost surface of the outermost surface in the radial direction. The reason is that the pulley contact surfaces 18c, 18c at both axial ends of the cradle pin 17 are inclined so as to follow the inclination of the V surfaces 19, 19 of the pulleys 13, 14, so This is because the length in the direction is the longest at the radially outer position, and by fixing the retainer pin 20 there, a large gap β between the retainer pin 20 and the end link plate 16E can be secured.

Second embodiment

  Next, a second embodiment of the present invention will be described based on FIG. 5 and FIG.

  The end link plate 16E of the first embodiment has the same shape as the other link plates 16 ..., but in the second to fourth embodiments, the shape of the end link plate 16E is another link. It differs from the shape of the plate 16.

  The end link plate 16E of the present embodiment includes a pair of protrusions 16c and 16c that are spaced apart in the front-rear direction at the radially inner end, and one protrusion at the center in the front-rear direction of the radially outer end. 16d. These protrusions 16c, 16c, and 16d are configured by bending a portion formed integrally with the outer peripheral portion of the plate material constituting the end link plate 16E by 90 ° toward the outside in the axial direction. The lengths of the protrusions 16c, 16c, and 16d are set so that a slight gap α is formed between the protrusions 16c, 16c, and 16d, or the V surface 19 is lightly contacted. The length of the protrusion 16d at the radially outer end is longer in accordance with the inclination angle of the V surface 19 than the length of the protrusions 16c, 16c at the ends.

  Also in the present embodiment, a predetermined gap β larger than the gap α is formed between the axial outer surface of the end link plate 16E and the retainer pin 20.

  According to the present embodiment, in addition to the operational effects of the first embodiment, the following further operational effects can be achieved. That is, since the total axial thickness of the plurality of laminated link plates 16 ..., 16E, 16E is determined by the thickness of the plate members constituting the link plates 16, ..., 16E, 16E and the number of laminated layers, In some cases, the thickness is discrete and cannot be set to an optimum size.

  Therefore, when the end link plate 16E of the first embodiment does not have the radially inner end protrusions 16c, 16c, the radially inner end 16b (see FIG. 4) is the pulley 13,14. In order to face the V surfaces 19 and 19 with a slight clearance α, the radially inner end 16b of the end link plate 16E faces radially inward (that is, the groove bottom of the pulleys 13 and 14). May need to be extended). As a result, since the radial dimension of the end link plate 16E increases, it becomes difficult to bring the chain 15 close to the groove bottoms of the pulleys 13 and 14, and the chain orange continuously variable transmission T becomes less orange. is there.

  However, according to the present embodiment, by appropriately adjusting the protruding amount in the axial direction of the protruding portions 16c and 16c at the radially inner end, the position of the protruding portions 16c and 16c can be moved inward in the radial direction. The axially outer end can be made to face the V surface 19 of the pulleys 13 and 14 via a slight gap α, and the chain orange continuously variable transmission T can be sufficiently secured.

  Further, according to the present embodiment, the end link plate 16E also includes the protrusions 16d at the radially outer end, so that the load that the end link plate 16E receives from the V surface 19 of the pulleys 13 and 14 is the radially inner end. In addition, it is possible to ensure the durability of the end link plate 16E while dispersing the protrusions 16c, 16c, and 16d at the outer ends and suppressing the strength of the protrusions 16c, 16c, and 16d.

  In addition, according to the present embodiment, the protrusions 16c, 16c, and 16d are formed by bending a part of the end link plate 16E, so that no special parts are required for forming the protrusions 16c, 16c, and 16d. Thus, the number of parts and assembly man-hours can be reduced.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  The end link plate 16E of the third embodiment reduces the number of protrusions 16c at the radially inner end of the second embodiment from two to one, and one protrusion at the radially outer end. After eliminating the portion 16d, a pair of protrusions 16e, 16e that bend the both ends in the front-rear direction and protrude outward in the axial direction are added. Also in the present embodiment, the retainer pin 20 is connected to the end link by the projection 16c at the radially inner end and the pair of projections 16e, 16e at both ends in the front-rear direction contacting the V surface 19 of the pulleys 13 and 14 first. The function of preventing contact with the plate 16E is the same.

  In addition, according to the present embodiment, when the chain 15 is engaged with the V surfaces 19 and 19 of the pulleys 13 and 14, the protrusions 16 e and 16 e on the front side in the front-rear direction are the pulley contact surfaces 18 c of the cradle pin 17. Since the end link plate 16E is positioned in the axial direction, the pulley contact surfaces 18c and 18c of the cradle pin 17 are connected to the pulleys 13 and 14 in order to contact the V surfaces 19 and 19 of the pulleys 13 and 14 before the pulleys 18c. By making contact with the V surfaces 19, 19, it is possible to stabilize the posture of the chain 15 and more reliably prevent the retainer pin 20 from contacting the end link plate 16E.

Fourth embodiment

  Next, a fourth embodiment of the present invention will be described based on FIG. 9 and FIG.

  In the fourth embodiment, the radially inner end protrusion 16c of the third embodiment is eliminated, and only the protrusions 16e and 16e at both ends in the front-rear direction are left. In this way, even if the projection 16c at the radially inner end is abolished from the end link plate 16E, the clearance β is secured between the retainer pin 20 and the end link plate 16E by the projections 16e and 16e at both ends in the front-rear direction. Therefore, the same effect as the third embodiment can be achieved.

Fifth embodiment

  Next, a fifth embodiment of the present invention will be described based on FIG. 11 and FIG.

  The fifth embodiment is a modification of the above-described second embodiment, in which protrusions 16c, 16c, and 16d formed by bending a part of the end link plate 16E of the second embodiment are formed. Instead, projections 16c, 16c, and 16d, which are separate members made of cylindrical pins, are fixed to the end link plate 16E by press-fitting or welding. According to the fifth embodiment, in addition to the effects of the second embodiment, the end link plate 16E is made of the same member as the other link plates 16, and the types of parts are reduced to reduce costs. The effect of achieving this is achieved.

Sixth embodiment

  Next, a sixth embodiment of the present invention will be described based on FIG. 13 and FIG.

  The sixth embodiment is a modification of the above-described fourth embodiment, and replaces the protrusions 16e and 16e formed by bending a part of the end link plate 16E of the fourth embodiment. The protrusions 16e and 16e, which are separate members made of cylindrical pins, are fixed to the end link plate 16E by press fitting or welding. According to the sixth embodiment, in addition to the function and effect of the fourth embodiment, the end link plate 16E is formed of the same member as the other link plates 16, and the types of parts are reduced to reduce the cost. The effect of achieving this is achieved.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the shape of the link plate 16 of the chain 15 and the way of stacking are not limited to the embodiment.

  The means for fixing the retainer pin 20 to the cradle pin 17 is not limited to welding, and other means such as press-fitting can be employed.

13 Drive pulley (pulley)
14 Driven pulley (pulley)
15 Chain 16 Link plate 16E End link plate 16c Radial inner end projection 16d Radial outer end projection 16e Front and rear direction projections 17 Cradle pin 19 V surface 20 Retainer pin β Gap

Claims (5)

An endless chain (15) wound between pulleys (13, 14) capable of changing the groove width and transmitting a driving force is arranged in the axial direction, and both ends are V surfaces of the pulley (13, 14). A plurality of cradle pins (17) in contact with (19), a plurality of link plates (16) that are stacked in an axial direction and endlessly connect the plurality of cradle pins (17), and the cradle pins (17) A chain-type continuously variable transmission comprising a retainer pin (20) that is fixed to a retainer pin (20) that locks an end link plate (16E) positioned at an axial end of the plurality of link plates (16),
When the end link plate (16E) contacts the V surface (19) of the pulley (13, 14) at a position where the chain (15) is wound around the pulley (13, 14), the retainer pin ( 20) and a gap (β) formed between the end link plate (16E) and the chain type continuously variable transmission.   The end link plate (16E) includes a protrusion (16c) protruding outward in the axial direction at the radially inner end, and the protrusion (16c) contacts the V surface (19) of the pulley (13, 14). The chain type continuously variable transmission according to claim 1, wherein:   The end link plate (16E) is provided with a protrusion (16d) protruding outward in the axial direction at the radially outer end, and the protrusion (16c) at the radially inner end is a V surface of the pulley (13, 14). 3. The chain type according to claim 2, wherein the projecting portion (16 d) at the radially outer end also contacts the V surface (19) of the pulley (13, 14) when contacting the (19). Continuously variable transmission.   Protrusions (16e) projecting outward in the axial direction are provided at both ends in the front-rear direction of the end link plate (16E), and the projecting part (16c) at the radially inner end is a V-plane of the pulley (13, 14) ( The chain type continuously variable step according to claim 2, wherein the protrusions (16e) at both ends in the front-rear direction also contact the V surface (19) of the pulley (13, 14) when contacting with 19). transmission.   The chain type continuously variable transmission according to any one of claims 2 to 4, wherein the end link plate (16E) is bent to form the protrusions (16c, 16d, 16e). Machine.

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