JP2009250339A - Press fitting structure and press fitting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost press fitting structure with a simple configuration realizing a press fitting method enclosing peeling chips, material powder and the like during press fitting near an engagement part. <P>SOLUTION: In the press fitting structure which press fits one tooth part 36t provided on one engagement member 36 positioned in either one side of a first fitting member 36 or a second fitting member 34 in the radial direction and the other tooth part 34t provided on the other fitting member 34 positioned in either other side in the radial direction, the structure is mounted with a fitting part closing cover 41 composed by a plurality of tooth-like parts 41t having a tooth length shorter than the tooth part 36t so that a recess part 43 positioned in an end side in the axis direction where the press fitting is started on the tooth part 36t and opening to the side between the tooth part 36t in the radial direction is formed on the fitting member 36. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a press-fitting structure and a press-fitting method, and more particularly to a press-fitting structure and a press-fitting method that are suitable for preventing swarf and material powder from dropping from a press-fitting part.

  Conventionally, spline fitting and serration fitting have been frequently used in connecting a separate member to be integrally rotated in a power transmission device and various types of rotation transmission units.

  For example, in an automatic transmission for a vehicle, an input rotation shaft from a power source is arranged at the center, and friction such as a clutch or a brake is provided between a plurality of rotating bodies surrounding the rotating shaft or between a rotating body and a transmission case. The power transmission path to the planetary gear unit is switched according to the vehicle speed and the engine speed by selectively coupling with the engagement element or regulating the mutual rotation direction via the one-way clutch, and the output side of the planetary gear unit In many cases, the planetary gear unit carrier, the output side transmission gear, the clutch and brake drums, etc. surround the input rotation shaft. Since it has a boss and an annular wall, the members that should rotate together can be rotated by fitting using splines and serrations. Fitting structure bound to a direction integrally is used everywhere.

  As this type of conventional fitting structure, for example, an elastic member for torque transmission having an uneven profile shape is arranged between a pulley and a hub constituting a torque limiter, and an uneven shape corresponding to this is provided on the pulley side. It is known that an unnecessary transmission structure such as a bolt or the like is provided, and in this case, the uneven engagement portion of the pulley and the elastic member for torque transmission is covered with the opening side of the pocket, The elastic member is provided with an enlarged diameter portion for preventing dust intrusion (see, for example, Patent Document 1).

In addition, in order to engage any one of the gears arranged on both sides of the hub with the hub in the rotational direction, a coupling that can move in the axial direction is provided on the hub, and the inner spline and each gear of the coupling are provided on the hub. It is known that the clutch teeth are engaged with each other. In this spline structure, stepped chamfers for preventing flash protrusion are provided on both ends of the inner spline of the coupling. (For example, refer to Patent Document 2).

Furthermore, although it is not fitting by splines or serrations, when manufacturing a composite gear that integrates a spur gear and a bevel gear as a countermeasure against flashing at the time of coupling, a short cylindrical portion facing both members is provided and both cylindrical shapes are provided. The ring-shaped closing member that engages the back side of the bevel gear on the bevel gear side from the friction-weld surface of both cylindrical portions is supported in advance in the concave portion on the spur gear side. There is one in which a flash on the outer peripheral side of the friction welded joint portion of the ring-shaped portion is enclosed in a composite gear by a ring-shaped closing member (see, for example, Patent Document 3).
JP 2006-220166 A JP 2002-286134 A JP 05-084614 A

  However, in the conventional parts joining structure and method as described above, when press-fitting using splines or serrations is performed, the material hardness of members joined by press-fitting is significantly different. Because of this, or if any of the members to be fitted has a missing tooth structure, so-called peeling occurs on the side of the press-fitted portion where the material hardness is low or in the tooth portion that enters the missing tooth space. There is a problem in that foreign matter is easily caught in parts assembled in the surrounding area because metal powder and scrap generated by the splatter are scattered or dropped.

  Moreover, in the above-mentioned conventional example, since the member which suppresses the outflow of a flash etc. is arrange | positioned in the near side (rear side) of the press-fitting direction from the part in which a foreign material generate | occur | produces, it was the structure which engages these with the other party member. When the front side in the press-fitting direction is opened, there is a problem that a member for blocking foreign matter is also required on the open side, resulting in an increase in cost and an increase in weight.

  On the other hand, it is conceivable to reduce the stuffiness at the time of press-fitting by increasing the processing accuracy of the parts, but when the parts to be press-fitted are large parts and other shaft holes, shafts, teeth, etc. are formed Not only is it very expensive, but it is still difficult to get rid of it.

  The present invention has been made to solve the above-described conventional problems, and a press-fitting method capable of reliably containing scumming waste, material powder, and the like during press-fitting in the vicinity of the fitting portion. It is another object of the present invention to provide a low-cost press-fitting structure with a simple configuration.

  In order to achieve the above object, the press-fitting fitting structure according to the present invention includes (1) a first fitting member and a second fitting member each having a tooth portion protruding in the radial direction and extending in the axial direction, One tooth portion provided on one of the first fitting member and one of the second fitting members located on one side in the radial direction, the first fitting member, In the press-fitting fitting structure in which the other tooth portion provided on the other fitting member located on the other side in the radial direction among the second fitting members is press-fitted, the one fitting member In addition, a concave portion that is located on one end side in the axial direction where the press-fitting is started with respect to the one tooth portion and that opens on one side in the radial direction is formed between the one tooth portion and the one tooth portion. Fitting part occlusion composed of a plurality of tooth-like parts having a tooth height equal to or lower than the tooth height of one tooth part There, characterized in that it is mounted.

  With this configuration, when one tooth part (for example, an internal tooth part) of one fitting member and the other tooth part (for example, an external tooth part) of the other fitting member are press-fit, one tooth part The fitting portion closing lid configured by a plurality of tooth-like portions having a tooth height equal to or less than the tooth height is positioned on the front side in the insertion direction when fitting from the fitting portion between one tooth portion and the other tooth portion. However, an annular space is formed between the fitting portion and the annular section is moved as fitting proceeds. Therefore, even if scumming or material powder falls off at the pressure contact part of one tooth part and the other tooth part during press-fitting and fitting, the scumming waste or material powder produced by the swarf or material powder is an annular space corresponding to the recess. In addition, the annular space is always closed between the press-fitting fitting part and the fitting part closing lid from the start to the end of the press-fitting fitting. It remains encapsulated and no scraping or material powder drops or scatters when assembling the parts.

  In addition, the tooth | gear part here should just make the ridge (meaning the protrusion extended in the shape of a stripe) in the direction of an axis, and although cross-sectional shape is not limited, spline and serration Thus, it is comprised by several teeth spaced apart in the circumferential direction.

  In the press-fit fitting structure having the configuration described in (1) above, (2) the plurality of tooth-like portions of the fitting portion closing lid are looser than the one tooth portion with respect to the other tooth portion. It is preferable that the shape is set so as to be fitted.

  With this configuration, peeling due to the fitting portion closing lid itself is prevented.

  In the press-fit fitting structure having the configuration described in the above (1) and (2), (3) the fitting portion closing lid is attached to the plurality of toothed portions and the one fitting member. It is preferable that the plurality of tooth-like portions are constituted by an annular portion that integrally couples.

  With this configuration, it is possible to facilitate the size and shape suitable for closing the fitting portion while approximating the plurality of tooth-like portions of the fitting portion closing lid to the tooth shape of one tooth portion. Since there is no need to add parts, the configuration can be simplified.

  In the press-fit fitting structure having the configuration described in the above (1) to (3), (4) the one fitting member has an inner tooth portion, and the other fitting member has an outer tooth portion. Is preferred.

  With this configuration, when the press-fitting fitting is completed, the fitting portion closing lid comes close to the vertical wall portion of the mating cylindrical body, so that the state of containment of the flaking waste and material powder in the fitting portion is ensured. It can be maintained.

  In the press-fit fitting structure having the configuration described in (1) to (4) above, (5) the first fitting member constitutes a part of a carrier of the planetary gear unit, and the second fitting member However, it is preferable that the transmission gear disposed on one side in the axial direction of the planetary gear unit is integrally coupled in the rotational direction.

  With this configuration, the carrier having the cylindrical portion and the vertical wall portion and the transmission gear can be press-fitted and fitted without splattering or dropping the dust and material powder.

  In the press fit fitting structure having the configuration described in (5) above, it is also preferable that (6) the planetary gear unit constitutes a Ravigneaux type planetary gear.

  With this configuration, the Ravigneaux carrier, which is a large component, and the transmission gear can be press-fitted and fitted without scattering or dropping material powder or flakes.

  In the press-fit fitting structure having the configuration described in the above (1) to (6), it is preferable that (7) the one tooth portion and the other tooth portion are spline-fitted in a press-fit state.

  With this configuration, even if there is a whip at the time of press-fitting, the whistling debris remains confined in the fitting site, and the whistling debris and material powder do not fall or scatter when the parts are assembled.

In order to achieve the above object, the press-fitting method according to the present invention includes (8) a first fitting member and a second fitting member each having a tooth portion protruding in the radial direction and extending in the axial direction. One tooth portion provided on one fitting member located on one side in the radial direction, and on the other side in the radial direction among the first fitting member and the second fitting member A press-fitting method for press-fitting the other tooth portion provided on the other fitting member located;
A concave portion that is located on one end side in the axial direction where the press-fitting is started with respect to the one tooth portion, and that opens on one side in the radial direction between the one tooth portion and the one tooth portion. A fitting portion closing lid constituted by a plurality of tooth-shaped portions having a tooth height equal to or lower than the tooth height of the one tooth portion is mounted, and then the one fitting member and the other These fitting members are moved relative to each other in the axial direction to be press-fitted and fitted.

  With this configuration, prior to press-fitting one tooth portion (for example, an internal tooth portion) of one fitting member and the other tooth portion (for example, an external tooth portion) of the other fitting member, By simply attaching the fitting portion closing lid to the member, at the time of press-fitting, the fitting portion closing lid constituted by a plurality of tooth-like portions having a tooth height equal to or lower than the tooth height of one tooth portion is An annular space is formed between the toothed portion and the other toothed portion while being positioned on the front side in the insertion direction during fitting, and the annular portion is formed with the progress of fitting. This section will be moved. Therefore, even if scumming or material powder falls off at the pressure contact part of one tooth part and the other tooth part during press-fitting and fitting, the scumming waste or material powder produced by the swarf or material powder is an annular space corresponding to the recess. In addition, the annular space is always closed between the press-fitting fitting part and the fitting part closing lid from the start to the end of the press-fitting fitting. It remains encapsulated and no scraping or material powder drops or scatters when assembling the parts.

  When the fitting portion closing lid is fitted to one fitting member, the fitting portion closing lid can have a hardness different from that of the cylindrical body, but the fitting member has a higher hardness than the one fitting member. In the case of a joint cover, the press-fitting allowance between the tooth-shaped part of the fitting part closing cover and the tooth part of the other fitting member on the mating side is reduced or a slight gap is fitted. In the case of a fitting portion closing lid having a lower hardness than one fitting member, the press-fitting fitting allowance between the fitting portion closing lid and the tooth portion of the other fitting member is set between the cylindrical bodies. By making it equal to or more than the fitting allowance, the sealing performance of swarf can be improved. Further, at least the inner peripheral portion (the top portion of the tooth-like portion) can be chamfered on the plurality of tooth-like portions of the fitting portion closing lid, and the fitting portion closing lid is formed of an elastic material (for example, a leaf spring material). And it is good also as a snap ring which can be attached or detached to one fitting member.

  According to the present invention, when one tooth portion of one fitting member and the other tooth portion of the other fitting member are press-fitted and fitted, the fitting portion is constituted by a plurality of tooth-like portions. The lid is positioned on the front side in the insertion direction when mated from the mating site of one tooth and the other tooth, and forms an annular space adjacent to the mating site. Even if scumming or material powder falls off at the fitting part, scumming waste or material powder is accommodated in the annular space corresponding to the recess, and the annular space is from the start of press-fitting to the end. It can always block | close between a press-fit fitting site | part and a fitting part obstruction | occlusion lid | cover, and can enclose a waste waste and material powder to a fitting site | part. As a result, a press-fit method that can reliably seal the waste dust and material powder during press-fit is provided in the vicinity of the fitting site, and provides a low-cost press-fit structure with a simple configuration. be able to.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic longitudinal sectional view showing a press-fitting fitting structure according to a first embodiment of the present invention, and exemplifies a case where the present invention is used for coupling of transmission elements of an automatic transmission for a vehicle. Yes. FIG. 2 is a front view of the fitting portion closing lid in the press-fitting fitting structure of the first embodiment, and FIG. 3 is for a vehicle using the press-fitting fitting structure of the first embodiment. It is a skeleton figure which shows schematic structure of an automatic transmission.

  First, the configuration will be described.

  As shown in FIG. 1, the press-fitting structure of the present embodiment is used for coupling some transmission elements of the automatic transmission for a vehicle shown in FIG. The overall configuration will be briefly described.

  Although not described in detail individually, the automatic transmission 1 shown in FIG. 3 includes a torque converter (not shown) that transmits rotational power from an engine (not shown) to the input shaft 11, a gear transmission mechanism 14 having planetary gear units 12 and 13, The hydraulic control unit 15 includes a plurality of clutches C1 and C2 that are hydraulic friction elements and brakes B1, B2, and B3.

  The input shaft 11 is rotatably supported by the transmission case 16, and is coupled to the clutch drum side of the clutches C1 and C2 and the sun gear 21 of the planetary gear unit 12 in a rotational direction integrally by, for example, spline fitting.

  The planetary gear unit 12 includes a sun gear 21 having external teeth (not shown), an inner ring gear 22 that surrounds the sun gear 21, and a plurality of pinions 23 that mesh with the sun gear 21 and the ring gear 22 (only one is shown in the figure). And a carrier 24 that supports the plurality of pinions 23 so as to be capable of rotating and revolving around the central axis of the sun gear 21 that is the central axis of the input shaft 11.

  The planetary gear unit 13 is a so-called Ravigneaux type, which has a large-diameter sun gear 31a, a small-diameter sun gear 31b, a plurality of long pinions 33 that mesh with the large-diameter sun gear 31a, and a small-diameter sun gear that meshes with the long pinion 33. A ring gear 32 that surrounds 31b, a Ravigneaux carrier 34 that supports a plurality of long pinions 33 so that they can rotate and revolve around the central axis of the input shaft 11, and a Ravigneaux carrier 34 that rotates so as to mesh with a small-diameter sun gear 31b. And a short pinion 35 supported so as to be capable of revolving around the central axis of the input shaft 11.

  The ring gear 32 is supported by the transmission case 16 so as to be rotatable only in one direction via the one-way clutch F1, and is braked so as to be selectively restrained to the transmission case 16 side by the brake B2. Further, the Ravigneaux carrier 34 is integrally coupled with a counter drive gear 36 serving as an output member to the transmission gear train 50 in the subsequent stage by press-fitting using a spline.

  In the gear transmission mechanism 14, the ring gear 22 of the planetary gear unit 12, the carrier 24, and the small-diameter sun gear 31 b of the planetary gear unit 13 coupled to the carrier 24 in the rotational direction are selectively braked by the operation of the brakes B 1 and B 3. On the other hand, the operation of the clutches C1, C2 and the one-way clutch F1 selectively drives the large-diameter sun gear 31a of the planetary gear unit 13, and the ring gear 32 is selectively rotated, braked, or rotated only in one direction. When receiving a possible constraint, the transmission ratio is changed by switching the power transmission path from the input shaft 11 to the counter drive gear 36 via the planetary gear units 12 and 13.

  The hydraulic control device 15 is configured to include a hydraulic control circuit for selectively engaging the clutches C1 and C2 and the brakes B1, B2, and B3, but the configuration itself is the same as a known one. The description is omitted here. The rear transmission gear train 50 includes a counter driven gear 51 that meshes with the external teeth 36d of the counter drive gear 36, a differential pinion 52 that is integrally coupled thereto, and a differential gear that is integrally attached to a differential case 54. Power is transmitted from the output shaft 56 to the left and right drive wheels via a differential device 55.

  Although not shown in detail, the clutches C1, C2 and the brakes B1, B2, B3 each have a hub as an annular body, a drum or a cylindrical body, a friction plate for friction engagement, and an operation mechanism. As a drum and a cylinder integrated with the case.

  Next, the press fit fitting structure of this Embodiment is demonstrated.

  As described above, the counter drive gear 36 is integrally coupled to the Ravigneaux carrier 34 by press-fitting using a spline, and the press-fitting structure of the present embodiment is employed at the coupling portion. ing.

  As shown in a partial cross section in FIG. 1, the Ravigneaux carrier 34 is a first fitting member having a cylindrical wall portion 34a and a vertical wall portion 34b extending substantially perpendicular to the cylindrical wall portion 34a. The counter drive gear 36 is a second fitting member having a cylindrical wall portion 36a and a vertical wall portion 36b extending substantially perpendicular to the cylindrical wall portion 36a. In this case, the counter drive gear 36 which is a transmission gear to the subsequent stage is formed of a material harder than the Ravigneaux carrier 34 or heat-treated so as to have a higher hardness.

  In the press-fitting fitting structure of the present embodiment, a cylindrical wall portion 34a serving as a fitting portion among the Ravigneaux carrier 34 and the counter drive gear 36 which are the first fitting member and the second fitting member, Compared with one of the fitting members located on the outer side in the radial direction as compared with 36a, for example, the counter drive gear 36 and the cylindrical wall portions 34a and 36a serving as fitting portions of the Ravigneaux carrier 34 and the counter drive gear 36. The other fitting member located inside in the radial direction, for example, Ravigneaux carrier 34, is spline-fitted by press-fitting (hereinafter, spline fitting with press-fitting is also simply referred to as spline fitting). Yes.

  Further, an inner tooth portion 36t for fitting a spline is provided on the inner peripheral side of the cylindrical wall portion 36a of the counter drive gear 36, and a spline fit corresponding to the inner tooth portion 36t is provided on the outer peripheral side of the cylindrical wall portion 34a of the Ravigneaux carrier 34. A combined external tooth portion 34t is provided.

  Here, the inner teeth 36t of the counter drive gear 36 are a plurality of parallel trapezoids arranged at equal angular intervals on the inner peripheral surface of the cylindrical wall portion 36a of the counter drive gear 36 so as to extend in parallel with the axis. The outer teeth 34t of the Ravigneaux carrier 34 are arranged at equiangular intervals so as to extend in parallel with the axis on the outer peripheral surface of the cylindrical wall 34a of the Ravigneaux carrier 34. It consists of external spline teeth with a plurality of parallel trapezoidal cross sections.

  Thus, in the present embodiment, the first fitting member is configured by the cylindrical wall portion 34a and the vertical wall portion 34b which are part of the Ravigneaux carrier 34 of the planetary gear unit 13, and the axial direction of the planetary gear unit 13 is A second fitting member is constituted by the cylindrical wall portion 36a and the vertical wall portion 36b that are integrally coupled in the rotational direction to the external teeth 36d of the counter drive gear 36 (transmission gear) disposed on one side. . The inner tooth portion 36t provided in the counter drive gear 36 and the outer tooth portion 34t provided in the Ravigneaux carrier 34 are spline-fitted in a press-fitted state.

  On the other hand, the counter drive gear 36 is positioned on one end side in the axial direction (the left end side of the cylindrical wall portion 36a in FIG. 1) where the spline fitting by the press fitting with the Ravigneaux carrier 34 is started with respect to the inner tooth portion 36t. As shown, the fitting portion closing lid 41 is attached. Here, the one end side in the axial direction where the spline fitting by press-fitting is started is the front side in the press-fitting direction, and preferably the falling side of the waste dust during press-fitting with respect to the spline fitting part. .

  As shown in FIG. 2, the fitting portion closing lid 41 integrally couples a plurality of tooth-like portions 41 t having a tooth height equal to or less than the tooth height of the internal tooth portion 36 t and the plurality of tooth-like portions 41 t. The counter drive gear 36 moves to a fitting position indicated by a virtual line in FIG. 1 with respect to the Ravigneaux carrier 34, and the Ravigneaux carrier 34 and the counter drive gear 36 are spline fitted. When this is done, a recess 43 is formed between the inner tooth portion 36t and opens radially inward. Here, the annular portion 41r of the fitting portion closing lid 41 has an outer diameter close to the opening diameter on the left end side in FIG. 1 of the cylindrical wall portion 36a of the counter drive gear 36, and the cylindrical wall portion of the counter drive gear 36 It is prevented from coming off by a snap ring 42 fitted in 36a (annular groove without symbol).

  As shown in FIG. 4, the plurality of tooth-like portions 41 t of the fitting portion closing lid 41 have a tooth shape close to the inner tooth portion 36 t formed on the cylindrical wall portion 36 a of the counter drive gear 36, and for example, a rabbi The overall shape is set so that it fits more loosely than the inner tooth portion 36t with respect to the outer tooth portion 34t of the Nyo carrier 34. In other words, the fitting portion closing lid 41 has a shape in which the inner peripheral portion is cut into a tooth shape so that the fitting portion closing lid 41 can be fitted to the outer tooth portion 34 t of the Ravigneaux carrier 34 more loosely than the inner tooth portion 36 t.

  Further, as shown in an enlarged view in the circle in FIG. 1, the plurality of tooth-like portions 41t of the fitting portion closing lid 41 are at least forward in the press-fitting direction on the inner peripheral side which is the tip portion of the tooth-like portion 41t. It is chamfered on the side.

  Next, the operation of the press-fitting structure according to this embodiment will be described, and the press-fitting method according to this embodiment will be described.

  In the present embodiment configured as described above, when the counter drive gear 36 and the Ravigneaux carrier 34 are spline-fitted, prior to press-fitting work for the spline fitting, one of the fittings is performed in advance. A fitting portion closing lid 41 is attached to the counter drive gear 36, which is a member, and the fitting portion closing lid 41 and the inner tooth portion 36t are located on one end side in the axial direction where spline fitting is started with respect to the inner tooth portion 36t. In between, a plurality of tooth-like portions 41t having a tooth height equal to or smaller than the tooth height of the inner tooth portion 36t is formed with a recess 43 that opens inward (one side) in the radial direction.

  Next, the counter drive gear 36 and the Ravigneaux carrier 34 are made to coincide with each other in the axial direction (further, while managing the combination position in the rotational direction and the verticality of the portion where the verticality is required). The counter drive gear 36 and the Ravigneaux carrier 34 are spline-fitted by performing press-fitting work for relative movement in the axial direction.

  In the press-fitting structure and press-fitting method of the present embodiment using the fitting part closing lid 41 as described above, the inner tooth part 36t (one tooth part) of the counter drive gear 36 and the Ravigneaux carrier 34 are When the outer tooth portion 34t (the other tooth portion) is spline-fitted, the plurality of tooth-like portions 41t of the fitting portion closing lid 41 have a tooth height equal to or lower than the tooth height of the inner tooth portion 36t, and the inner tooth portion. An annular space corresponding to the concave portion 43 is formed adjacent to the pressure contact portion between the cylindrical bodies 34 and 36 while being positioned on the front side in the press-fitting direction from the pressure contact portion of 36t and the external tooth portion 34t. The annular section moves as the press-fitting of the counter drive gear 36 and the Ravigneaux carrier 34 progresses.

  Therefore, even if scumming or material powder falls off at the press contact portion of the hard inner tooth portion 36t and the relatively soft outer tooth portion 34t at the time of spline fitting, the scumming waste or material powder remains in the recess 43. In addition, the annular space is always between the spline fitting portion and the fitting portion closing lid 41 from the start to the completion of the spline fitting and further thereafter. Because it remains blocked, the waste dust and material powder remain sealed in the mating area, and the waste dust and material powder do not fall or scatter when the parts are assembled. The problem of foreign matter biting into these parts is prevented.

  In the present embodiment, the plurality of tooth-like portions 41t of the fitting portion closing lid 41 are set so as to be loosely fitted to the outer tooth portion 34t than the inner tooth portion 36t. Peeling by the joint block lid 41 itself is prevented.

  Furthermore, since the fitting portion closing lid 41 is constituted by a plurality of tooth-like portions 41t and an annular portion 41r that is attached to the counter drive gear 36 and integrally couples the plurality of tooth-like portions 41t, The size and shape suitable for closing the fitting portion can be easily set while approximating the plurality of tooth-like portions 41t of the fitting portion closing lid 41 to the tooth shape of the inner tooth portion 36t. Since it is not necessary to add 41t, the configuration can be simplified.

  In addition, since the counter drive gear 36 has an inner tooth portion and the Ravigneaux carrier 34 has an outer tooth portion, the fitting portion closing lid 41 is a Ravigneaux member that is a counterpart cylindrical body when the spline fitting is completed. It will be close to the vertical wall part 34b of the carrier 34, and the containment state to the fitting site | part of peeling waste and material powder | flour can be maintained reliably.

  Thus, in the present embodiment, the first fitting member configured by a part of the Ravigneaux carrier 34 of the planetary gear unit 13 and the one side in the axial direction of the planetary gear unit 13 are arranged with a simple configuration. The Ravigneaux carrier 34 having the cylindrical wall portions 34a and 36a and the vertical wall portions 34b and 36b and the counter drive when the second fitting member that is integrally coupled to the counter drive gear 36 in the rotational direction is splined. The gear 36 can be press-fitted without splashing or dropping the waste dust and material powder, and foreign matter can be prevented from being caught in parts assembled after the press-fitting.

  Moreover, even if the Ravigneaux carrier 34 and the counter drive gear 36, which are large parts, are likely to be squeezed due to press-fitting at the time of spline fitting, scumming waste and material powder are fitted by the fitting part closing lid 41. Since it remains securely contained in the vicinity of the part, no peeling dust or material powder falls or scatters when assembling the parts.

  When the fitting portion closing lid 41 is fitted to the counter drive gear 36 as in the above-described embodiment, the fitting portion closing lid 41 can have a hardness different from that of the counter drive gear 36. In the case of a fitting part closing lid having a hardness higher than that of the counter drive gear 36, as described above, the tooth-like portion 41t of the fitting part closing lid 41 and the external tooth part 34t of the Ravigneaux carrier 34 which is the counterpart side. It is preferable to reduce the press-fitting allowance between them or make a slight gap fitting. When the fitting portion closing lid is harder than the counter drive gear 36, the fitting portion closing lid 41 and the Ravigneaux carrier are used. By making the press-fitting fitting allowance between the outer teeth 34t of 34 equal to or more than the fitting allowance between the cylindrical bodies 34, 36, it is possible to improve the sealing performance of the waste dust. Further, the fitting portion closing lid 41 itself may be formed of an elastic material (for example, a leaf spring material) to be a snap ring that can be attached to and detached from the counter drive gear 36.

Furthermore, in the present embodiment, the fitting portion closing lid 41 is an internal gear-like lid member having a tooth shape approximating the internal tooth portion 36t of the counter drive gear 36. However, the Ravigneaux carrier 34 and the counter drive gear 36 Depending on the material and the shape of the fitting portion, the fitting portion closing lid may be an external gear-like lid member having a tooth shape that approximates the external tooth portion.
(Second Embodiment)
FIG. 5 is a cross-sectional view showing a press-fitting structure according to a second embodiment of the present invention, and illustrates the case where the present invention is used for coupling transmission elements of an automatic transmission for a vehicle. Yes. The present embodiment has the same overall configuration as the first embodiment described above, except that the shape of the fitting portion closing lid and the mounting portion of the fitting portion closing lid are different. Will be described only in detail using the reference numerals shown in FIGS.

  In the present embodiment, an inner tooth portion 36t (the other tooth portion) of the counter drive gear 36 and the outer tooth portion 34t, which is one tooth portion, on the Ravigneaux carrier 34 side, which is one fitting member, An external gear-shaped fitting portion closing lid 61 is mounted so as to be positioned on one end side in the axial direction at which the press fitting is started.

  When the Ravigneaux carrier 34 and the counter drive gear 36 are spline-fitted, the fitting portion closing lid 61 forms an external tooth so as to form a concave portion 63 that opens outward in the radial direction between the external tooth portion 34t. A plurality of tooth-like portions 61t having a tooth height equal to or less than the tooth height of the portion 34t and an annular portion 61r that integrally couples the plurality of tooth-like portions 61t are configured.

  Here, the annular portion 61r of the fitting portion closing lid 61 has an inner diameter close to the opening diameter on the distal end side of the cylindrical wall portion 34a of the Ravigneaux carrier 34, and the cylindrical wall portion 34a (unsigned) of the Ravigneaux carrier 34 It is prevented from coming off by a snap ring 62 fitted in the annular groove).

  As shown in FIG. 5A, the plurality of tooth-like portions 61t of the fitting portion closing lid 61 have a tooth profile that approximates the external tooth portion 34t formed on the cylindrical wall portion 34a of the Ravigneaux carrier 34. In addition, for example, the overall shape is set so that the inner tooth portion 36t of the counter drive gear 36 fits more loosely than the outer tooth portion 34t.

  Further, as shown in FIG. 5 (a), the plurality of tooth-like portions 61t of the fitting portion closing lid 61 are chamfered at least on the front side in the press-fitting direction on the outer peripheral side which is the tip of the tooth-like portion 61t. ing.

  Also in the press-fit fitting structure of the present embodiment configured as described above, when the outer teeth 34t of the Ravigneaux carrier 34 and the inner teeth 36t of the counter drive gear 36 are spline-fitted, a plurality of The fitting portion blocking lid 61 constituted by the tooth-like portion 61t is located on the front side in the insertion direction during fitting from the fitting portion of the outer tooth portion 34t and the inner tooth portion 36t, and is adjacent to the fitting portion. Since an annular space corresponding to the concave portion 63 is formed, even if the spline fitting portion is spilled or the material powder falls off, the scumming waste or the material powder is caused to flow into the annular space corresponding to the concave portion. The annular space is always closed between the spline fitting portion and the fitting portion closing lid 61 from the start to the end of the spline fitting, and the waste dust and the material powder are contained in the fitting portion. Can do. As a result, similarly to the first embodiment described above, it is possible to provide a low-cost press-fitting structure that can reliably seal the squeezing at the time of press-fitting in the fitting portion with a simple configuration. it can.

  In each of the above-described embodiments, the first fitting member and the second fitting member are the Ravigneaux carrier 34 and the counter drive gear 36, but the clutch or brake drum in the automatic transmission, or other When press-fitting between a rotating body having a hub that is a cylindrical portion using splines or serrations, the two cylindrical bodies to be press-fitted are connected to the first fitting member and the second fitting. Needless to say, it can be a joint member. In addition, in order to match the phase of the fitting portion closing lid and the tooth portion in the rotation direction, the fitting portion closing lid and one fitting member can be engaged with each other in an uneven manner or a small hole for positioning can be provided. Of course, it is also conceivable that the fitting portion closing lid is rotatably attached to one fitting member, and the tip of the tooth portion on the other side is sharpened to make phase adjustment unnecessary. Furthermore, one of the fitting members referred to in the present invention is a high-hardness fitting member exclusively when there is a difference in material hardness between the members to be fitted. When the posture is constant, a fitting part closing lid is mounted on the falling side of debris and material powder with respect to the press-fitting fitting part, and the fitting member to which the fitting part closing cover is attached is fitted on one side. It becomes as a joint member as above-mentioned.

  As described above, the press-fitting structure and method according to the present invention is a fitting constituted by a plurality of tooth-like portions when one fitting member and the other fitting member are press-fitted. Since the part closing lid is located on the front side in the insertion direction when fitted from the fitting part of one tooth part and the other tooth part, an annular space adjacent to the fitting part is formed. Even if stagnation or material powder falls off at the press-fitting part, scumming waste or material powder is accommodated in the annular space corresponding to the recess, and the annular space is terminated from the start of the press-fitting. Until then, it is always closed between the press-fitting part and the closure lid, and waste dust and material powder can be contained in the fitting part. When it is possible to provide a low-cost press-fitting fitting structure that can securely seal the mating part in the fitting part It is useful for general press-fitting structure and press-fitting method suitable for preventing the material powder from dropping from the fitting part. is there.

It is a schematic longitudinal cross-sectional view which shows the press fit fitting structure which concerns on the 1st Embodiment of this invention. It is a front view of the fitting part obstruction | occlusion lid | cover in the press fit fitting structure of 1st Embodiment. It is a skeleton figure showing the schematic structure of the automatic transmission for vehicles using the press fit fitting structure of a 1st embodiment. It is a fragmentary cross-sectional view of the principal part of the press fit fitting structure which concerns on 1st Embodiment. It is a figure which shows the press fit fitting structure which concerns on the 2nd Embodiment of this invention, (a) is the fragmentary cross-sectional view of the principal part, (b) is the elements on larger scale of the principal part.

Explanation of symbols

11 Input shaft 13 Ravigneaux type planetary gear unit 16 Transmission case 31a Large diameter sun gear 31b Small diameter sun gear 32 Ring gear 33 Long pinion 34 Ravigneaux carrier (second fitting member, other fitting member; one fitting member )
34a, 36a Cylindrical wall portion 34b, 36b Vertical wall portion 34t External tooth portion (the other tooth portion; one tooth portion)
35 Short pinion 36 Counter drive gear (first fitting member, one fitting member; the other fitting member)
36t internal teeth (one tooth; other tooth)
41, 61 Fitting portion closing lid 41r, 61r Annular portion 41t, 61t Plural tooth portions 42, 62 Snap ring 43, 63 Recess 50 Transmission gear train 51 Counter driven gear 52 Differential pinion 53 Differential ring gear 54 Differential case 55 Differential device 56 Output shaft B1, B2, B3 Brake C1, C2 Clutch F1 One-way clutch

Claims (8)

Each of the first and second fitting members includes a first fitting member and a second fitting member that protrude in the radial direction and have tooth portions extending in the axial direction. One of the teeth provided on one of the fitting members located on either one of the first fitting member and the second fitting member is located on the other side in the radial direction In the press-fitting structure for press-fitting the other tooth portion provided on the other fitting member,
A concave portion that is located on one end side in the axial direction where the press-fitting is started with respect to the one tooth portion, and that opens on one side in the radial direction between the one tooth portion and the one tooth portion. The press-fitting fitting structure is characterized in that a fitting portion closing lid constituted by a plurality of tooth-like portions having a tooth height equal to or lower than the tooth height of the one tooth portion is mounted.   The shape of the plurality of tooth-like portions of the fitting portion closing lid is set so as to fit more loosely than the one tooth portion with respect to the other tooth portion. The press-fit structure described.   The fitting portion closing lid is constituted by the plurality of tooth-like portions and an annular portion that is attached to the one fitting member and integrally couples the plurality of tooth-like portions. The press-fitting fitting structure according to claim 1 or 2.   The press fitting according to any one of claims 1 to 3, wherein the one fitting member has an inner tooth portion, and the other fitting member has an outer tooth portion. Mating structure. The first fitting member constitutes a part of the carrier of the planetary gear unit;
The said 2nd fitting member is integrally couple | bonded with the rotation direction with respect to the transmission gear arrange | positioned at the axial direction one side of the said planetary gear unit. The press-fit fitting structure according to claim 1.   The press-fit fitting structure according to claim 5, wherein the planetary gear unit constitutes a Ravigneaux type planetary gear.   The press-fitting fitting structure according to any one of claims 1 to 6, wherein the one tooth portion and the other tooth portion are spline-fitted in a press-fitted state. . Of the first and second fitting members each having a tooth portion that protrudes in the radial direction and extends in the axial direction, the fitting member is provided on one of the fitting members located on either side of the radial direction. One tooth part and the other tooth part provided in the other fitting member located in either radial side among the said 1st fitting member and the said 2nd fitting member are press-fit. A press-fitting fitting method,
A concave portion that is located on one end side in the axial direction where the press-fitting is started with respect to the one tooth portion, and that opens on one side in the radial direction between the one tooth portion and the one tooth portion. A fitting portion closing lid constituted by a plurality of tooth-shaped portions having a tooth height equal to or lower than the tooth height of the one tooth portion is mounted, and then the one fitting member and the other A press-fitting and fitting method, wherein the fitting member is press-fitted and moved relative to each other in the axial direction.

Images