JP6206961B2 - 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 provided at both ends in the axial direction of the cradle pins and positioned at the axial end of the plurality of link plates The present invention relates to a chain type continuously variable transmission that includes first and second retainer pins that lock an end link plate.

  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 circumstances, and an object of the present invention is to prevent a retainer pin welded to a cradle pin from falling off in a chain of a chain type continuously variable transmission.

  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 stacked in the axial direction to connect the plurality of cradle pins endlessly, and provided at both axial ends of the cradle pins. A chain type continuously variable transmission that includes first and second retainer pins that lock end link plates positioned at axial end portions of the plurality of link plates, wherein the first retainer pin is the cradle. The second retainer pin is formed separately from the cradle pin and welded to the cradle pin after assembly to the chain. Kitan portion at least one of said first Ritenapin or link plate chain type continuously variable transmission, characterized in that the opposing is proposed.

  According to the invention described in claim 2, in addition to the structure of claim 1, the chain is formed between the first retainer pin and the end link plate at a position where the chain is wound around the pulley. A chain type continuously variable transmission is proposed in which the gap is smaller than the gap formed between the second retainer pin and the end link plate.

  According to the invention described in claim 3, in addition to the configuration of claim 2, only the second retainer pin is provided on the link plate that is shifted inward in the axial direction adjacent to the front and rear of the end link plate. A chain-type continuously variable transmission characterized by facing each other 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 surface, a plurality of link plates that are stacked in the axial direction and endlessly connect the plurality of cradle pins, and a plurality of link plates that are provided at both axial ends of the cradle pins. 1st and 2nd retainer pin which latches the edge part link plate located in the axial direction edge part of them.

  The first retainer pin is formed integrally with the cradle pin, and the second retainer pin is formed separately from the cradle pin and welded to the cradle pin after being assembled to the chain. At least one first retainer pin is provided on each end link plate. Since it faces each other, the end link plate is supported by the high-strength first retainer pin to prevent the end link plate from moving outward in the axial direction and is prevented from being transmitted to the low-strength second retainer pin, and the durability of the second retainer pin Can be increased.

  According to the configuration of claim 2, the gap formed between the first retainer pin and the end link plate is formed between the second retainer pin and the end link plate at a position where the chain is wound around the pulley. Since it is smaller than the gap formed, the end link plate can be reliably prevented from first contacting the first retainer pin and contacting the second retainer pin, and the durability of the second retainer pin having low strength can be enhanced.

  According to the third aspect of the present invention, since only the second retainer pin is opposed to the link plate that is adjacent to the front and rear of the end link plate and is displaced inward in the axial direction, there is no possibility that the end link plate contacts. It is possible to eliminate the waste of facing the first retainer pin having high strength to the retainer pin.

The figure which shows the whole structure of a chain type continuously variable transmission. FIG. 2 is an enlarged view of part 2 of FIG. 1. FIG. 3 is a three-direction arrow view of FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG.

  Hereinafter, embodiments 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, the first and second retainer pins 20A and 20B projecting radially outward are fixed to both ends of the pin unit 18 of the cradle pin 17 in the axial direction so that the link plates 16 are not dropped 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 the first and second retainer pins 20A and 20B. The end link plate 16E of the present embodiment is a member having the same shape as the other link plates 16.

  The first retainer pin 20A is integrally formed when the cradle pin 17 is forged. The second retainer pin 20B is fixed by welding after the cradle pin 17 is inserted through the link plate 16 and the end link plates 16E and 16E. . In the drawing, the first retainer pin 20A is shown in white and the second retainer pin 20B is shown in black. Since the first retainer pin 20A is integral with the cradle pin 17 and is heat-treated simultaneously when the cradle pin 17 is heat-treated, the strength thereof is relatively high. On the other hand, since the second retainer pin 20B is retrofitted to the cradle pin 17 and cannot be subjected to heat treatment, its strength is lower than that of the first retainer pin 20A.

  The two single pins 18 and 18 constituting the cradle pin 17 are provided with a first retainer pin 20A and a second retainer pin 20B at both ends, respectively, but with the two single pins 18 and 18 assembled to the chain 15, 1st retainer pin 20A, 20A and 2nd retainer pin 20B, 20B are arrange | positioned so that it may become alternate. The first retainer pin 20A and the second retainer pin 20B are arranged so as to be shifted inward in the axial direction of the cradle pin 17, and accordingly, the first retainer pin 20A and the end link plate are located at a position where the chain 15 is wound around the pulleys 13 and 14. The clearance α between the axial outer surface of 16E is smaller than the clearance β between the second retainer pin 20B and the axial outer surface of the end link plate 16E (see FIG. 4).

  The link plate rows having the end link plates 16E, 16E are arranged in a row, and the cradle pins 17 inserted into the link plate rows not having the end link plates 16E, 16E are second retainer pins at both ends in the axial direction. 20B and 20B (see FIG. 5). The gap γ between the two second retainer pins 20B and 20B and the link plates 16 and 16 at the axially outer ends opposed thereto is set to be equal to or larger than the gap β. (Α <β ≦ γ).

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

  As shown in FIGS. 4 and 5, in the portion where the chain 15 is wound around the pulleys 13 and 14, the pulley contact surfaces 18 c and 18 c at both axial ends of the single pin 18 constituting the cradle pin 17 of the chain 15 are The pulleys 13 and 14 are pinched between a pair of V surfaces 19 and 19 of the fixed pulley halves 13a and 14a and the movable pulley halves 13b and 14b.

  At this time, since the clearance α between the axial outer surface of the end link plates 16E and 16E and the first retainer pin 20A is smaller than the clearance β between the second retainer pin 20B (see FIG. 4), the link plate 16 and the end link When the plates 16E and 16E are displaced in the axial direction on the cradle pin 17, the first retainer pin 20A having high strength comes into contact with the end link plate 16E first, so that the second retainer pin 20B having low strength is connected to the end link. Contact with the plate 16E is prevented, and thereby the durability of the second retainer pin 20B can be enhanced.

  Further, since the two single pins 18 and 18 constituting the cradle pin 17 are arranged so that the first retainer pins 20A and 20A and the second retainer pins 20B and 20B are alternated, the axial direction of each end link plate 16E. The first retainer pin 20A always faces the outside, and contact between the end link plate 16E and the second retainer pin 20B can be reliably prevented. Note that the two paired pins 18 and 18 are the same interchangeable members and need only be mounted in the opposite direction, so that the types of parts can be reduced and the cost can be reduced.

  Further, the second retainer pins 20B and 20B having low strength are opposed to the pair of link plates 16 and 16 at both ends in the axial direction of the link row not having the end link plates 16E and 16E (see FIG. 5). Since the distance γ between 20B, 20B and the pair of link plates 16, 16 is set to be equal to or larger than the gap β, there is no possibility that the second retainer pin 20B contacts the link plate 16. Therefore, it is possible to contribute to cost reduction by minimizing the number of expensive first retainer pins 20A.

  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.

  In the embodiment, the clearance α between the first retainer pin 20A and the axial outer surface of the end link plate 16E is smaller than the clearance β between the second retainer pin 20B and the axial outer surface of the end link plate 16E. Although set, the intervals α and β may be matched. Even if comprised in this way, durability of the 2nd retainer pin 20B is securable because the 1st retainer pin 20A with high intensity | strength supports the load from the edge part link plate 16E.

  In the embodiment, two first retainer pins 20A are opposed to one end link plate 16E. However, it is only necessary that at least one first retainer pin 20A is opposed to one end link plate 16E. .

  Further, in the embodiment, the first retainer pin 20A is forged integrally with the cradle pin 17, but the first retainer pin 20A can be integrally cast or the first retainer pin 20A can be integrally formed. In short, the first retainer pin 20 </ b> A may be integrated with the cradle pin 17 before the cradle pin 17 is assembled with the chain 15.

13 Drive pulley (pulley)
14 Driven pulley (pulley)
15 Chain 16 Link plate 16E End link plate 17 Cradle pin 19 V surface 20A First retainer pin 20B Second retainer pin α Clearance β Clearance

Claims (3)

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) First and second retainer pins (20A, 20B) that are respectively provided at both ends in the axial direction and that lock end link plates (16E) located at the axial ends of the plurality of link plates (16). A chain type continuously variable transmission comprising:
The first retainer pin (20A) is formed integrally with the cradle pin (17), and the second retainer pin (20B) is formed separately from the cradle pin (17) and is assembled to the chain (15). A chain type continuously variable transmission which is welded to the cradle pin (17) and has at least one first retainer pin (20A) opposed to each of the end link plates (16E).   The gap (α) formed between the first retainer pin (20A) and the end link plate (16E) at the position where the chain (15) winds around the pulley (13, 14) 2. The chain type continuously variable transmission according to claim 1, wherein the chain type continuously variable transmission is smaller than a gap (β) formed between the two retainer pins (20 </ b> B) and the end link plate (16 </ b> E).   The second retainer pin (20B) is opposed to the link plate (16) which is adjacent to the front and rear of the end link plate (16E) and is displaced inward in the axial direction. Chain type continuously variable transmission.

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