JP6478532B2 - Tripod type constant velocity joint - Google Patents

Description

  The present invention relates to a tripod constant velocity joint that connects two shafts, a drive shaft and a driven shaft, and transmits the power of the drive shaft to the driven shaft.

  In general, in various devices using constant velocity joints, the drive shaft and the driven shaft are connected with the joint portion interposed between them for maintenance and replacement due to deterioration of parts (the drive force is transmitted) ), Or may be disconnected (the drive force may not be transmitted).

  As such a constant velocity joint that can be easily connected and separated, for example, a tripod type constant velocity joint described in Patent Document 1 is known.

  The tripod type constant velocity joint described in Patent Document 1 is inclined at the tip of the bulging portion formed between adjacent track grooves of the outer ring in a direction opposite to the circumferential direction, and the circumferential width of the bulging portion. A pair of tapered surfaces are formed at the center of the protrusion, and the front side portion of the protrusion is inclined toward the both sides from the center in the width direction of the protrusion to form the top at the center in the width direction of the protrusion. A pair of tapered surfaces are provided, and the outer ring and the tripod member can be easily connected and separated.

JP 2007-255511 A

  In the tripod type constant velocity joint described in Patent Document 1, even when the phase of the track groove and the protruding portion is deviated in the circumferential direction when the tripod member is inserted from the opening side end of the outer ring, the protruding portion expands. The contact is guided by a tapered surface formed at the leading end of the protruding portion, and is guided to the opening at the leading end of the track groove. For this reason, it is not necessary to perform phase alignment of the track groove and the protruding portion, and the tripod constant velocity joint can be connected very easily.

  However, when connecting the joint, in some rare cases, the connection cannot be made smoothly. If the connection is made forcibly, the top of the bulging part or the top of the protruding part may be damaged.

  As a result of investigating the cause of occurrence of such a problem, when the joint is connected, the phase of the top of the bulging part and the top of the projecting part completely coincide with each other so that a so-called three-point support is stable, and the tapered surface It became clear that the guidance effect by was not performed. Further, it has been found that, by forcibly pushing in at this time, a pressing force more than expected is applied, so that the contacting top portion is damaged.

  Therefore, the problem of the present invention is that the three-point support between the top portions does not occur, the guiding effect by the tapered surface is remarkably excellent, the top portion of the bulging portion and the top portion of the protruding portion are not damaged, tripod type, etc. It is a fast joint.

In order to solve the above-mentioned problems, the present invention provides a tripod formed on the inner periphery of the outer ring by forming three track grooves extending in the axial direction on the inner periphery of the outer ring at intervals of 120 ° in the circumferential direction. In a tripod type constant velocity joint in which the member is slidable in each track groove and provided with three protrusions for transmitting torque between the outer ring and the tripod member, adjacent track grooves of the outer ring A pair of tapered surfaces are formed at the distal end of the bulging portion formed between them and inclined in a direction opposite to the circumferential direction to form a peak at the center of the circumferential width of the bulging portion. In the front side part which becomes the leading side when the joint is inserted into the tripod member from the opening end of the outer ring, the top part is inclined toward the both sides from the center in the width direction of the projecting part to the front side part. form The axial position of the top part of at least one of the bulging parts is the axial position of the top part of the other bulging part among the top parts of the three bulging parts of the outer ring. A different configuration is adopted.

  Since the axial position of the top part of at least one bulging part among the top parts of the three bulging parts of the outer ring is different from the axial position of the top part of the other bulging part, Three-point support between the tops by the tops and the tops of the protrusions can be avoided.

  In particular, it is preferable that the top portion of one bulge portion among the top portions of the three bulge portions of the outer ring protrudes more forward than the top portions of the other two bulge portions.

  As another configuration, three track grooves extending in the axial direction on the inner periphery of the outer ring are formed at intervals of 120 ° in the circumferential direction, and the tripod member built inside the outer ring has each track described above. In a tripod constant velocity joint that is slidable in a groove and has three protrusions that transmit torque between the outer ring and the tripod member, a swelling formed between adjacent track grooves of the outer ring A pair of tapered surfaces are formed at the distal end of the protruding portion so as to incline in a direction opposite to the circumferential direction to form a top portion at the center of the circumferential width of the bulging portion, and from the outer ring opening end of the protruding portion A pair of tapers that are inclined toward the both sides from the center in the width direction of the projecting portion on the front side portion, which is the leading side when the joint for inserting the tripod member is assembled, to form a peak at the center in the width direction of the projecting portion And the axial position of the top of at least one of the three protrusions of the tripod member is different from the axial position of the top of the other protrusion. .

  Of the tops of the three protrusions of the tripod member, the axial position of the top of at least one of the protrusions is different from the axial position of the top of the other protrusions. Three-point support between the tops by the tops of the protrusions can be avoided.

  In particular, it is preferable that the top of one of the three protrusions of the tripod member protrudes more forward than the top of the other two protrusions.

  Since it is such a structure, when connecting an outer ring | wheel and a tripod member, it can avoid that the top part of 3 points | pieces contacts the top part of 3 points | pieces of the other party simultaneously, and since top parts contact in an unstable state, top part There is no longer any three-point support between them.

  Further, if a tapered surface is provided at the tip of the bulging portion formed between adjacent track grooves of the outer ring so as to enter the outer ring from the outer diameter side toward the inner diameter side, the tripod member extends from the outer ring opening end. Even when the outer ring and the tripod member are misaligned when the joint is inserted, the tapered surface of the projecting portion is contacted and guided by the tapered surface formed at the tip of the bulging portion, and the projecting portion of the track groove Since it is guided to the tip opening, the tripod constant velocity joint can be easily connected.

  Furthermore, when at least one of the outer ring and the tripod member is a synthetic resin molded product, a tripod type constant velocity joint that is effective in noise prevention and excellent in quietness can be obtained.

  According to this invention, the three-point support between the top on the outer ring side and the top on the tripod member side does not occur, and the guiding effect by the tapered surface is remarkably excellent, and the top of the bulge and the top of the protrusion are damaged. It can be a tripod type constant velocity joint.

Longitudinal front view showing an embodiment of the present invention Right side view of FIG. The disassembled perspective view which shows the outer ring | wheel and tripod member of the embodiment Longitudinal front view showing another embodiment The disassembled perspective view which shows the outer ring | wheel and tripod member of embodiment of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the tripod constant velocity joint includes an outer ring 1 and a tripod member 11 incorporated inside the outer ring 1.

  The outer ring 1 has a configuration in which a first shaft 3 is provided at the closed end of the cup portion 2 whose one end is open, and three track grooves 4 extending in the axial direction from the opening end are provided on the inner periphery of the cup portion 2. Are formed at intervals of 120 ° in the circumferential direction. A pair of side surfaces 5 facing each other in the circumferential direction of each track groove 4 are flat surfaces parallel to each other.

  The tripod member 11 has a second shaft 12. The tripod member 11 is integrally provided with three projecting portions 13 that are inserted into the track grooves 4 of the outer ring 1.

  Each protrusion 13 is slidable in the axial direction in the track groove 4. Further, the side surfaces 14 on both sides of each protrusion 13 facing the side surface 5 of the track groove 4 are respectively cylindrical surfaces that bend along the axial direction of the tripod member 11. In this embodiment, the axial centers of the opposing cylindrical surfaces face the radial direction of the tripod member 11 and coincide with the axial center of the protruding portion 13 in the protruding direction. In addition, it can replace with these cylindrical surfaces as both the side surfaces 14, and can also be made into the spherical surface which curves in the circumferential direction and two directions of an axial direction.

  When the rotational torque is input to one of the first shaft 3 and the second shaft 12, the projecting portion 13 engages at least one side surface 14 of the side surfaces 14 with the one side surface 5 of the track groove 4. Thus, the rotational torque around the shaft is transmitted between the outer ring 1 and the tripod member 11.

  At this time, the side surface 5 of the track groove 4 and the side surface 14 of the opposing protruding portion 13 are in contact with each other, and the contact portion is in sliding contact with each other, so that the bending function between the outer ring 1 and the tripod member 11 when a declination occurs. The swing function works smoothly.

  That is, when the first shaft 3 and the second shaft 12 transmit torque at a relatively angle, the projecting portion 13 slides along the track groove 4 in the axial direction of the outer ring 1. At this time, the contact between the side surface 14 of the projecting portion 13 and the side surface 5 of the track groove 4 is a line contact (point contact when a spherical surface is employed for the side surface 14), so that the slide resistance is small, and the projecting portion 13 is a track. Smoothly slides along the groove 4. As a result, even if there is a large declination between the first shaft 3 and the second shaft 12, it can be rotated at a constant speed without causing speed unevenness.

  A pair of tapered surfaces 7 are formed at the tip end portion (tip portion facing the opening side) of the bulging portion 6 formed between the adjacent track grooves 4 of the outer ring 1. The pair of taper surfaces 7 are inclined so as to enter the outer ring from the outer diameter side toward the inner diameter side, and are inclined in opposite directions in the circumferential direction to the center of the circumferential width of the bulging portion 6. A top 8 is formed. The top 8 is formed by a straight ridge line extending in the radial direction of the outer ring 1. The tapered surface 7 may be a flat surface or a convex curved surface.

  Further, three tapered surfaces 9 having both ends at the center of the circumferential width of the bulging portion 6 are formed on the outer peripheral portion of the opening end surface of the outer ring 1. That is, the tapered surface 9 is inclined so as to enter the inside of the outer ring from the outer diameter side toward the inner diameter side at the tip of the bulging portion 6 formed between the adjacent track grooves 4 of the outer ring 1.

  On the other hand, each protrusion 13 of the tripod member 11 is formed with a pair of tapered surfaces 15 on the front side which is the leading side when the joint is assembled to insert the tripod member 11 from the opening end of the outer ring 1. The pair of tapered surfaces 15 are inclined toward the both sides from the center in the width direction of the protruding portion 13 to form a top portion 16 at the center in the width direction of the protruding portion 13. The top portion 16 is constituted by a linear ridge line extending in the radial direction of the tripod member 11. The tapered surface 15 may be a flat surface or a convex curved surface.

  When the outer ring 1 and the tripod member 11 are connected, the top portion 16 of the protruding portion 13 provided in the direction of every 120 ° around the axis is connected to the top portion 8 of the bulging portion 6 also provided in the direction of every 120 °. The taper is first brought into contact with the tapered surface 7 on either side, and is guided to the track groove 4 along the tapered surface 7. At this time, the top portion 16 may be guided to the tapered surface 9 through contact with the tapered surface 9.

  However, when the phases of the top portion 8 of the bulging portion 6 and the top portion 16 of the protruding portion 13 coincide with each other at the time of connection, so-called three-point support is achieved, and not only the guidance effect by the tapered surface 7 can be expected but also assumed. For example, when the pushing force exceeds a certain value, the abutted top portions 8 and 16 may be damaged. Therefore, in order to avoid the three-point support between the top portions 8 and 16, the following configurations can be adopted.

  Here, as a first configuration, among the top portions 8 of the three bulging portions 6 of the outer ring 1, the axial position of the top portion 8 of at least one bulging portion 6 is set to the top portion 8 of the other bulging portion 6. It can be set to be different from the axial position. Here, in order to avoid the three-point support, it is only necessary that the top portion 8 of at least one bulging portion 6 is different from the other, and the two top portions 8 are in the same axial position and the other one top portion 8 is relative to each other. The structure which is located in front (opening side end part side) in general, the two top parts 8 are the same axial direction position, and the other one is located relatively back (closed side end part side), Or the structure from which all the axial direction positions of the three top parts 8 differ can be considered. At this time, the top portions 16 of the three projecting portions 13 on the tripod member 11 side are set to positions that do not simultaneously contact the three top portions 8 of the bulging portion 6, for example, all at the same axial position. The

  As a second configuration, among the top portions 16 of the three protrusions 13 of the tripod member 11, the axial position of the top portion 16 of at least one protrusion 13 is the axial direction of the top portion 16 of the other protrusion 13. It can be set differently from the position. Here, in order to avoid the three-point support, it is sufficient that the top 16 of at least one protrusion 13 is different from the other, and the two tops 16 are in the same axial position, and the other one top 16 is relative. A configuration in which the two top portions 16 are at the same axial position and the other one is positioned relatively rearward, or a configuration in which the three top portions 16 have different axial positions. Conceivable. At this time, the top portions 8 of the three bulging portions 6 on the outer ring 1 side are set to positions that do not simultaneously abut against the three top portions 16 of the protruding portion 13, for example, all at the same axial position. .

  For example, in FIGS. 1 to 3, among the tops 16 of the three protrusions 13 of the tripod member 11, the top 16 of one protrusion 13 (see reference A in FIG. 3) is the other two protrusions 13. The structure which protrudes only the distance L1 ahead from the top part 16 (refer code | symbol B, C in FIG. 3) is shown. The tops 16 of the other two protrusions 13 (see B and C) are at the same axial position, and the tops 8 of the three bulging parts 6 on the outer ring 1 side are all set at the same axial position. Has been. For this reason, the three-point support between the top portions 8 and 16 can be avoided.

  Further, for example, in FIGS. 4 and 5, among the top portions 8 of the three bulge portions 6 of the outer ring 1, the top portion 8 of one bulge portion 6 (see reference A in FIG. 5) is the other two. A configuration in which the bulge portion 6 is retracted backward by a distance L2 from the top portion 8 of the bulging portion 6 (see symbols B and C in FIG. 5), that is, the top portions 8 of the two bulging portions 6 (see symbols B and C). ) Shows a configuration projecting forward by a distance L2 from the top 8 of the other one bulging portion 6 (see the same symbol A). The top portions 8 of the other two bulging portions 6 (see the same symbols B and C) are at the same axial position, and the top portions 16 of the three protrusions 13 on the tripod member 11 side are all at the same axial position. Is set.

  For this reason, when the outer ring 1 and the tripod member 11 are connected, it is possible to avoid the three top portions 8 from simultaneously contacting the three other top portions 16 and the top portions 8 and 16 contact each other in an unstable state. Therefore, three-point support between the top portions 8 and 16 does not occur. As a result, the phases of both apexes 8 and 16 coincide with each other to provide a so-called three-point support, and in rare cases, the smooth connection cannot be achieved, and the connection between the outer ring 1 and the tripod member 11 is guided by the tapered surfaces 7 and 15. It is possible to obtain a tripod type constant velocity joint that is remarkably effective and highly reliable. Moreover, since it does not push forcibly, the top part 8 of the bulging part 6 and the top part 16 of the protrusion part 13 are not damaged.

  Further, the tripod constant velocity joint can be separated by separating the outer ring 1 and the tripod member 11.

  For this reason, it is possible to obtain a constant velocity joint that can be easily connected and disconnected. Replacement of the input side component that inputs power to the constant velocity joint and the output side component that is rotationally driven by the output from the constant velocity joint, etc. Can be easily performed.

  The tripod type constant velocity joint of the present invention has a configuration in which at least one of the outer ring 1 and the tripod member 11 is a synthetic resin molded product. At this time, the tripod member 11 and the outer ring 1 which are the other members may be made of metal, ceramics or synthetic resin.

  By adopting such a configuration, it is possible to enable dry operation without using a lubricant. Since no lubricant is used, boots are not required. In addition, weight reduction and quietness are improved. Most preferably, the other member is also a combination of synthetic resin moldings. By using both the outer ring 1 and the tripod member 11 as molded articles of synthetic resin, the weight reduction is further improved, and the handleability is improved. Desirably, the adhesion phenomenon can be prevented by using different materials for the base resin of one member and the base resin of the other member.

  As the synthetic resin, an appropriate synthetic resin that can be injection-molded by selecting an appropriate one according to the use conditions of the tripod type constant velocity joint is desirable. Any resin that can be injection-molded may be a thermoplastic resin or a thermosetting resin.

  There are two types of resin that can be injection-molded: crystalline resin and non-crystalline resin. Either resin can be used, but non-crystalline resin has low toughness and breaks rapidly when torque exceeds the allowable amount. Therefore, it is preferable to use a crystalline resin.

  Preferred synthetic resins include synthetic resins with high lubricating properties, such as polyacetal resins (POM), nylon resins, fluoroplastics such as PFA, FEP, and ETFE, injection moldable polyimide resins, and polyphenylene sulfide resins (PPS). , Wholly aromatic polyester resins, polyether ether ketone resins (PEEK), polyamideimide resins, and the like.

  Each of these resins may be used alone or a polymer alloy in which two or more kinds are mixed. Or the polymer alloy which mix | blended said synthetic resin with the synthetic resin with low lubrication characteristics other than the above may be sufficient.

  Moreover, even a synthetic resin having low lubricating properties can be used by enhancing the lubricating properties by adding a solid lubricant or lubricating oil. Examples of the solid lubricant include polytetrafluoroethylene, graphite, and molybdenum disulfide.

  Further, glass fiber, carbon fiber, various mineral fibers (whiskers) may be added to the synthetic resin to increase the strength, or may be used in combination with a solid lubricant or the like.

  The most suitable materials for use in the present invention are POM, nylon resin, PPS, and PEEK. The nylon resin may be nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 46, semi-aromatic nylon having an aromatic ring in the molecular chain, or the like. POM, nylon resin, and PPS are excellent in heat resistance and lubricity, and are relatively inexpensive. Therefore, a tripod constant velocity joint with excellent cost performance can be obtained.

  In this embodiment, the tripod member 11, the second shaft 12, and the protruding portion 13 are integrally formed of synthetic resin. However, the tripod member 11 and the protruding portion 13 are formed of synthetic resin, and the second shaft 12 is formed of ceramics or steel. You may form with metals, such as stainless steel and an aluminum alloy.

  In addition, when the 2nd axis | shaft 12 is comparatively long, in order to prevent a torque loss, it is preferable to form the 2nd axis | shaft 12 with ceramics or a metal.

  In the outer ring 1, the cup portion 2 and the first shaft 3 are integrally formed of synthetic resin. However, the first shaft 3 is formed of ceramics, steel, stainless steel, aluminum alloy, or the like, and is coupled to the cup portion 2. You may make it do.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Cup part 3 1st axis | shaft 4 Track groove 5 Side surface 6 Expanding part 7 Tapered surface 8 Top part 11 Tripod member 12 2nd axis | shaft 13 Protruding part 15 Tapered surface 16 Top part

Claims (5)

Three track grooves (4) extending in the axial direction on the inner circumference of the outer ring (1) are formed at intervals of 120 ° in the circumferential direction, and a tripod member (11) incorporated inside the outer ring (1). The tripod type is provided with three protrusions (13) which are slidable in the respective track grooves (4) and transmit torque between the outer ring (1) and the tripod member (11). In the speed joint,
The outer ring (1) and the tripod member (11) are synthetic resin molded products having different base resins,
The circumferential width of the bulging portion (6) is inclined at the tip of the bulging portion (6) formed between adjacent track grooves (4) of the outer ring (1) in a direction opposite to the circumferential direction. Forming a pair of tapered surfaces (7) forming a top (8) in the center of
The projecting portion (13) is inclined from the center in the width direction of the projecting portion (13) toward both sides to the front side portion that is the leading side when the tripod member (11) is inserted from the open end of the outer ring. A pair of tapered surfaces (15) forming a top (16) at the center in the width direction of the protrusion (13),
Of the three bulging portions (6) of the outer ring (1), the top portion (8) of at least one of the bulging portions (6) is positioned in the axial direction. A tripod constant velocity joint characterized by being different from the axial position of the top (8) of (6).   Of the three bulging portions (6) of the outer ring (1), the top (8) of one bulging portion (6) is the other two bulging portions (6). The tripod type constant velocity joint according to claim 1, wherein the tripod type constant velocity joint projects forward from the top (8). Three track grooves (4) extending in the axial direction on the inner circumference of the outer ring (1) are formed at intervals of 120 ° in the circumferential direction, and a tripod member (11) incorporated inside the outer ring (1). The tripod type is provided with three protrusions (13) which are slidable in the respective track grooves (4) and transmit torque between the outer ring (1) and the tripod member (11). In the speed joint,
The outer ring (1) and the tripod member (11) are synthetic resin molded products having different base resins,
The circumferential width of the bulging portion (6) is inclined at the tip of the bulging portion (6) formed between adjacent track grooves (4) of the outer ring (1) in a direction opposite to the circumferential direction. Forming a pair of tapered surfaces (7) forming a top (8) in the center of
The projecting portion (13) is inclined from the center in the width direction of the projecting portion (13) toward both sides to the front side portion that is the leading side when the tripod member (11) is inserted from the open end of the outer ring. A pair of tapered surfaces (15) forming a top (16) at the center in the width direction of the protrusion (13),
Of the three protrusions (13) of the tripod member (11), the top (16) of at least one of the protrusions (13) is positioned in the axial direction of the other protrusions (13). A tripod type constant velocity joint characterized in that it is different from the axial position of the top (16).   Of the tops (16) of the three protrusions (13) of the tripod member (11), the top (16) of one of the protrusions (13) is the top of the other two protrusions (13). The tripod type constant velocity joint according to claim 3, wherein the tripod type constant velocity joint projects forward from (16).   A tapered surface (9) that inclines so as to enter the inside of the outer ring from the outer diameter side toward the inner diameter side at the tip of the bulging part (6) formed between the adjacent track grooves (4) of the outer ring (1). The tripod type constant velocity joint according to any one of claims 1 to 4, wherein:

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